Stuff

database/migrations/1_initialize_schema.down.sql

@@ -0,0 +1 @@
+DROP TABLE `user`;

database/migrations/1_initialize_schema.up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE user (
+    username VARCHAR(250),
+    password VARCHAR(250)
+);
+
+INSERT INTO `user` (`username`, `password`) VALUES ("test", "test");

docker-compose.yml

@@ -0,0 +1,13 @@
+version: "3.9"  # optional since v1.27.0
+services:
+  db:
+    image: mariadb:10.6
+    ports:
+      - "3306:3306"
+    #volumes:
+    #  - ./docker-hdd/msql:/var/lib/mysql
+    environment:
+      - "MARIADB_ROOT_PASSWORD=test"
+      - "MARIADB_DATABASE=test"
+      - "MARIADB_USER=test"
+      - "MARIADB_PASSWORD=test"

go.mod

@@ -10,19 +10,26 @@ require (
 
 require (
 	github.com/go-chi/jwtauth/v5 v5.0.2
+	github.com/golang-migrate/migrate/v4 v4.15.1
+	github.com/rs/zerolog v1.26.0
 	github.com/unrolled/render v1.4.0
+	github.com/urfave/cli/v2 v2.3.0
 )
 
 require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.0-20210816181553-5444fa50b93d // indirect
 	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.13.0 // indirect
 	github.com/go-playground/universal-translator v0.17.0 // indirect
 	github.com/go-playground/validator/v10 v10.4.1 // indirect
+	github.com/go-sql-driver/mysql v1.5.0 // indirect
 	github.com/goccy/go-json v0.7.6 // indirect
-	github.com/golang/protobuf v1.3.3 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/json-iterator/go v1.1.9 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.0 // indirect
+	github.com/json-iterator/go v1.1.10 // indirect
 	github.com/leodido/go-urn v1.2.0 // indirect
 	github.com/lestrrat-go/backoff/v2 v2.0.8 // indirect
 	github.com/lestrrat-go/blackmagic v1.0.0 // indirect
@@ -31,11 +38,14 @@ require (
 	github.com/lestrrat-go/jwx v1.2.6 // indirect
 	github.com/lestrrat-go/option v1.0.0 // indirect
 	github.com/mattn/go-isatty v0.0.12 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/russross/blackfriday/v2 v2.0.1 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
 	github.com/ugorji/go/codec v1.1.7 // indirect
-	golang.org/x/crypto v0.0.0-20201217014255-9d1352758620 // indirect
+	go.uber.org/atomic v1.6.0 // indirect
-	golang.org/x/sys v0.0.0-20210525143221-35b2ab0089ea // indirect
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
-	gopkg.in/yaml.v2 v2.2.8 // indirect
+	golang.org/x/sys v0.0.0-20211013075003-97ac67df715c // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

main.go

@@ -1,23 +1,99 @@
 package main
 
 import (
+	"database/sql"
 	"embed"
 	"gin-test/pkg/sample"
 	"gin-test/pkg/user"
+	"github.com/go-chi/jwtauth/v5"
+	"github.com/rs/zerolog/log"
 	"net/http"
+	"os"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
 
+	"github.com/golang-migrate/migrate/v4"
+	"github.com/golang-migrate/migrate/v4/database/mysql"
+	"github.com/golang-migrate/migrate/v4/source/iofs"
 	"github.com/unrolled/render"
+	"github.com/urfave/cli/v2"
 )
 
 // content holds our static web server content.
 //go:embed static/* templates/*
 var webserver embed.FS
 
+//go:embed database/migrations/*.sql
+var migrationFS embed.FS
 
 func main() {
+	app := &cli.App{
+		Name: "Webpage",
+		Usage: "Sample Webapplication in golang",
+		Commands: []*cli.Command{
+			{
+				Name:    "run",
+				//Aliases: []string{"c"},
+				Usage:   "Run Webapplication",
+				Action:  func(c *cli.Context) error {
+					return runWebpage()
+				},
+			},
+			{
+				Name:    "migrate",
+				//Aliases: []string{"a"},
+				Usage:   "Execute the migrations",
+				Action:  func(c *cli.Context) error {
+					return runMigration()
+				},
+			},
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal().Err(err).Msg("Cant run application")
+	}
+}
+
+func runMigration() error {
+	log.Debug().Msg("Start Migration")
+	db, err := sql.Open("mysql", "root:test@tcp(localhost:3306)/test?multiStatements=true")
+	if err != nil {
+		log.Fatal().Err(err).Msg("Cant conect to Database")
+	}
+
+	d, err := iofs.New(migrationFS, "database/migrations")
+
+	if err != nil {
+		log.Fatal().Err(err).Msg("Cant create iofs")
+	}
+
+	driver, err := mysql.WithInstance(db, &mysql.Config{})
+
+	if err != nil {
+		log.Fatal().Err(err).Msg("Cant create driver")
+	}
+
+	m, err := migrate.NewWithInstance(
+		"iofs", d,
+		"test", driver)
+
+	if err != nil {
+		log.Fatal().Err(err).Msg("Cant create migration object")
+	}
+
+	err = m.Up()
+	if err != nil {
+		log.Error().Err(err).Msg("Cant execute Migrations")
+		return err
+	}
+	log.Info().Msg("Execute Migrations")
+	return nil
+}
+
+func runWebpage() error {
 	r := chi.NewRouter()
 	render := render.New(render.Options{
 		FileSystem: &render.EmbedFileSystem{
@@ -32,14 +108,17 @@ func main() {
 		r.Get("/", func(w http.ResponseWriter, r *http.Request) {
 			render.HTML(w, http.StatusOK, "index", map[string]string {"title": "Soeren"})
 		})
+
+		tokenAuth := jwtauth.New("HS256", []byte("secret"), nil)
+		uc := user.GetUserClient()
+
+
 		sample.Register(r)
-		user.Register(r)
+		user.Register(r, tokenAuth, uc)
 	})
 
 
-
+	http.ListenAndServe(":3000", r) //todo; handle this error
-
+	return nil
-
-	http.ListenAndServe(":3000", r)
 }
 

pkg/user/user.go

@@ -19,7 +19,9 @@ var ren *render.Render
 
 var tokenAuth *jwtauth.JWTAuth
 
-func Register(router chi.Router) {
+var uc *UserClient
+
+func Register(router chi.Router, token *jwtauth.JWTAuth, userClient UserClient) {
 	ren = render.New(render.Options{
 		//Layout: "layout",
 		FileSystem: &render.EmbedFileSystem{
@@ -33,7 +35,9 @@ func Register(router chi.Router) {
 	router.Post("/register", register)
 	router.Get("/logout", logout)
 
-	tokenAuth = jwtauth.New("HS256", []byte("secret"), nil)
+	//tokenAuth = jwtauth.New("HS256", []byte("secret"), nil)
+	tokenAuth = token
+	uc = &userClient
 
 	router.Group(func(r chi.Router) {
 		r.Use(jwtauth.Verifier(tokenAuth))
@@ -88,7 +92,6 @@ func logout(w http.ResponseWriter, r *http.Request)  {
 func register(w http.ResponseWriter, r *http.Request) {
 	r.ParseForm()
 
-
 	uc := GetUserClient()
 	res, _ := uc.register(r.FormValue("username"), r.FormValue("password"))
 	if res {

pkg/user/user_test.go

@@ -2,6 +2,7 @@ package user
 
 import (
 	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/jwtauth/v5"
 	"io"
 	"net/http/httptest"
 	"testing"
@@ -12,7 +13,9 @@ func TestGetLoginForm(t *testing.T)  {
 	rec := httptest.NewRecorder()
 	router := chi.NewRouter()
 	router.Group(func(r chi.Router) {
-		Register(r)
+		tokenAuth := jwtauth.New("HS256", []byte("secret"), nil)
+		uc := GetUserClient()
+		Register(r, tokenAuth, uc)
 	})
 
 	loginForm(rec, req)

readme.md

@@ -1,5 +1,12 @@
-Test für das entwickeln von Monolith webanwendung mit html gui in go.
+## Including Packages
 
+* https://github.com/go-chi/chi -> Routing and middelware
+* https://github.com/go-chi/jwtauth -> For JWT Auth
+* https://github.com/golang-migrate/migrate -> for mysql migration
+* https://github.com/urfave/cli -> for cli commands like migration
+
+
+Test für das entwickeln von Monolith webanwendung mit html gui in go.
 
 Es gibt unabhängige packages im pkg ordner die eine oder mehrere seiten beinhalten können. Jedes pkg beinhaltet alles um funktionieren zu können.
 
@@ -9,6 +16,6 @@ Alles ist in einem binary
 
 
 next steps:
-* auth über mehrer pkg sharen z.b. durch config object statt chi router in die Register funktion reichen
+* conifg per env
-* mysql migrationen oder andere datenbank für user einbauen
+* makefile  
 * ci/Cd bis docker image bauen

vendor/github.com/cpuguy83/go-md2man/v2/LICENSE.md

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Brian Goff
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/cpuguy83/go-md2man/v2/md2man/md2man.go

@@ -0,0 +1,14 @@
+package md2man
+
+import (
+	"github.com/russross/blackfriday/v2"
+)
+
+// Render converts a markdown document into a roff formatted document.
+func Render(doc []byte) []byte {
+	renderer := NewRoffRenderer()
+
+	return blackfriday.Run(doc,
+		[]blackfriday.Option{blackfriday.WithRenderer(renderer),
+			blackfriday.WithExtensions(renderer.GetExtensions())}...)
+}

vendor/github.com/cpuguy83/go-md2man/v2/md2man/roff.go

@@ -0,0 +1,345 @@
+package md2man
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/russross/blackfriday/v2"
+)
+
+// roffRenderer implements the blackfriday.Renderer interface for creating
+// roff format (manpages) from markdown text
+type roffRenderer struct {
+	extensions   blackfriday.Extensions
+	listCounters []int
+	firstHeader  bool
+	defineTerm   bool
+	listDepth    int
+}
+
+const (
+	titleHeader      = ".TH "
+	topLevelHeader   = "\n\n.SH "
+	secondLevelHdr   = "\n.SH "
+	otherHeader      = "\n.SS "
+	crTag            = "\n"
+	emphTag          = "\\fI"
+	emphCloseTag     = "\\fP"
+	strongTag        = "\\fB"
+	strongCloseTag   = "\\fP"
+	breakTag         = "\n.br\n"
+	paraTag          = "\n.PP\n"
+	hruleTag         = "\n.ti 0\n\\l'\\n(.lu'\n"
+	linkTag          = "\n\\[la]"
+	linkCloseTag     = "\\[ra]"
+	codespanTag      = "\\fB\\fC"
+	codespanCloseTag = "\\fR"
+	codeTag          = "\n.PP\n.RS\n\n.nf\n"
+	codeCloseTag     = "\n.fi\n.RE\n"
+	quoteTag         = "\n.PP\n.RS\n"
+	quoteCloseTag    = "\n.RE\n"
+	listTag          = "\n.RS\n"
+	listCloseTag     = "\n.RE\n"
+	arglistTag       = "\n.TP\n"
+	tableStart       = "\n.TS\nallbox;\n"
+	tableEnd         = ".TE\n"
+	tableCellStart   = "T{\n"
+	tableCellEnd     = "\nT}\n"
+)
+
+// NewRoffRenderer creates a new blackfriday Renderer for generating roff documents
+// from markdown
+func NewRoffRenderer() *roffRenderer { // nolint: golint
+	var extensions blackfriday.Extensions
+
+	extensions |= blackfriday.NoIntraEmphasis
+	extensions |= blackfriday.Tables
+	extensions |= blackfriday.FencedCode
+	extensions |= blackfriday.SpaceHeadings
+	extensions |= blackfriday.Footnotes
+	extensions |= blackfriday.Titleblock
+	extensions |= blackfriday.DefinitionLists
+	return &roffRenderer{
+		extensions: extensions,
+	}
+}
+
+// GetExtensions returns the list of extensions used by this renderer implementation
+func (r *roffRenderer) GetExtensions() blackfriday.Extensions {
+	return r.extensions
+}
+
+// RenderHeader handles outputting the header at document start
+func (r *roffRenderer) RenderHeader(w io.Writer, ast *blackfriday.Node) {
+	// disable hyphenation
+	out(w, ".nh\n")
+}
+
+// RenderFooter handles outputting the footer at the document end; the roff
+// renderer has no footer information
+func (r *roffRenderer) RenderFooter(w io.Writer, ast *blackfriday.Node) {
+}
+
+// RenderNode is called for each node in a markdown document; based on the node
+// type the equivalent roff output is sent to the writer
+func (r *roffRenderer) RenderNode(w io.Writer, node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
+
+	var walkAction = blackfriday.GoToNext
+
+	switch node.Type {
+	case blackfriday.Text:
+		r.handleText(w, node, entering)
+	case blackfriday.Softbreak:
+		out(w, crTag)
+	case blackfriday.Hardbreak:
+		out(w, breakTag)
+	case blackfriday.Emph:
+		if entering {
+			out(w, emphTag)
+		} else {
+			out(w, emphCloseTag)
+		}
+	case blackfriday.Strong:
+		if entering {
+			out(w, strongTag)
+		} else {
+			out(w, strongCloseTag)
+		}
+	case blackfriday.Link:
+		if !entering {
+			out(w, linkTag+string(node.LinkData.Destination)+linkCloseTag)
+		}
+	case blackfriday.Image:
+		// ignore images
+		walkAction = blackfriday.SkipChildren
+	case blackfriday.Code:
+		out(w, codespanTag)
+		escapeSpecialChars(w, node.Literal)
+		out(w, codespanCloseTag)
+	case blackfriday.Document:
+		break
+	case blackfriday.Paragraph:
+		// roff .PP markers break lists
+		if r.listDepth > 0 {
+			return blackfriday.GoToNext
+		}
+		if entering {
+			out(w, paraTag)
+		} else {
+			out(w, crTag)
+		}
+	case blackfriday.BlockQuote:
+		if entering {
+			out(w, quoteTag)
+		} else {
+			out(w, quoteCloseTag)
+		}
+	case blackfriday.Heading:
+		r.handleHeading(w, node, entering)
+	case blackfriday.HorizontalRule:
+		out(w, hruleTag)
+	case blackfriday.List:
+		r.handleList(w, node, entering)
+	case blackfriday.Item:
+		r.handleItem(w, node, entering)
+	case blackfriday.CodeBlock:
+		out(w, codeTag)
+		escapeSpecialChars(w, node.Literal)
+		out(w, codeCloseTag)
+	case blackfriday.Table:
+		r.handleTable(w, node, entering)
+	case blackfriday.TableCell:
+		r.handleTableCell(w, node, entering)
+	case blackfriday.TableHead:
+	case blackfriday.TableBody:
+	case blackfriday.TableRow:
+		// no action as cell entries do all the nroff formatting
+		return blackfriday.GoToNext
+	default:
+		fmt.Fprintln(os.Stderr, "WARNING: go-md2man does not handle node type "+node.Type.String())
+	}
+	return walkAction
+}
+
+func (r *roffRenderer) handleText(w io.Writer, node *blackfriday.Node, entering bool) {
+	var (
+		start, end string
+	)
+	// handle special roff table cell text encapsulation
+	if node.Parent.Type == blackfriday.TableCell {
+		if len(node.Literal) > 30 {
+			start = tableCellStart
+			end = tableCellEnd
+		} else {
+			// end rows that aren't terminated by "tableCellEnd" with a cr if end of row
+			if node.Parent.Next == nil && !node.Parent.IsHeader {
+				end = crTag
+			}
+		}
+	}
+	out(w, start)
+	escapeSpecialChars(w, node.Literal)
+	out(w, end)
+}
+
+func (r *roffRenderer) handleHeading(w io.Writer, node *blackfriday.Node, entering bool) {
+	if entering {
+		switch node.Level {
+		case 1:
+			if !r.firstHeader {
+				out(w, titleHeader)
+				r.firstHeader = true
+				break
+			}
+			out(w, topLevelHeader)
+		case 2:
+			out(w, secondLevelHdr)
+		default:
+			out(w, otherHeader)
+		}
+	}
+}
+
+func (r *roffRenderer) handleList(w io.Writer, node *blackfriday.Node, entering bool) {
+	openTag := listTag
+	closeTag := listCloseTag
+	if node.ListFlags&blackfriday.ListTypeDefinition != 0 {
+		// tags for definition lists handled within Item node
+		openTag = ""
+		closeTag = ""
+	}
+	if entering {
+		r.listDepth++
+		if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
+			r.listCounters = append(r.listCounters, 1)
+		}
+		out(w, openTag)
+	} else {
+		if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
+			r.listCounters = r.listCounters[:len(r.listCounters)-1]
+		}
+		out(w, closeTag)
+		r.listDepth--
+	}
+}
+
+func (r *roffRenderer) handleItem(w io.Writer, node *blackfriday.Node, entering bool) {
+	if entering {
+		if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
+			out(w, fmt.Sprintf(".IP \"%3d.\" 5\n", r.listCounters[len(r.listCounters)-1]))
+			r.listCounters[len(r.listCounters)-1]++
+		} else if node.ListFlags&blackfriday.ListTypeDefinition != 0 {
+			// state machine for handling terms and following definitions
+			// since blackfriday does not distinguish them properly, nor
+			// does it seperate them into separate lists as it should
+			if !r.defineTerm {
+				out(w, arglistTag)
+				r.defineTerm = true
+			} else {
+				r.defineTerm = false
+			}
+		} else {
+			out(w, ".IP \\(bu 2\n")
+		}
+	} else {
+		out(w, "\n")
+	}
+}
+
+func (r *roffRenderer) handleTable(w io.Writer, node *blackfriday.Node, entering bool) {
+	if entering {
+		out(w, tableStart)
+		//call walker to count cells (and rows?) so format section can be produced
+		columns := countColumns(node)
+		out(w, strings.Repeat("l ", columns)+"\n")
+		out(w, strings.Repeat("l ", columns)+".\n")
+	} else {
+		out(w, tableEnd)
+	}
+}
+
+func (r *roffRenderer) handleTableCell(w io.Writer, node *blackfriday.Node, entering bool) {
+	var (
+		start, end string
+	)
+	if node.IsHeader {
+		start = codespanTag
+		end = codespanCloseTag
+	}
+	if entering {
+		if node.Prev != nil && node.Prev.Type == blackfriday.TableCell {
+			out(w, "\t"+start)
+		} else {
+			out(w, start)
+		}
+	} else {
+		// need to carriage return if we are at the end of the header row
+		if node.IsHeader && node.Next == nil {
+			end = end + crTag
+		}
+		out(w, end)
+	}
+}
+
+// because roff format requires knowing the column count before outputting any table
+// data we need to walk a table tree and count the columns
+func countColumns(node *blackfriday.Node) int {
+	var columns int
+
+	node.Walk(func(node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
+		switch node.Type {
+		case blackfriday.TableRow:
+			if !entering {
+				return blackfriday.Terminate
+			}
+		case blackfriday.TableCell:
+			if entering {
+				columns++
+			}
+		default:
+		}
+		return blackfriday.GoToNext
+	})
+	return columns
+}
+
+func out(w io.Writer, output string) {
+	io.WriteString(w, output) // nolint: errcheck
+}
+
+func needsBackslash(c byte) bool {
+	for _, r := range []byte("-_&\\~") {
+		if c == r {
+			return true
+		}
+	}
+	return false
+}
+
+func escapeSpecialChars(w io.Writer, text []byte) {
+	for i := 0; i < len(text); i++ {
+		// escape initial apostrophe or period
+		if len(text) >= 1 && (text[0] == '\'' || text[0] == '.') {
+			out(w, "\\&")
+		}
+
+		// directly copy normal characters
+		org := i
+
+		for i < len(text) && !needsBackslash(text[i]) {
+			i++
+		}
+		if i > org {
+			w.Write(text[org:i]) // nolint: errcheck
+		}
+
+		// escape a character
+		if i >= len(text) {
+			break
+		}
+
+		w.Write([]byte{'\\', text[i]}) // nolint: errcheck
+	}
+}

vendor/github.com/go-sql-driver/mysql/.gitignore

@@ -0,0 +1,9 @@
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+Icon?
+ehthumbs.db
+Thumbs.db
+.idea

vendor/github.com/go-sql-driver/mysql/.travis.yml

@@ -0,0 +1,129 @@
+sudo: false
+language: go
+go:
+  - 1.10.x
+  - 1.11.x
+  - 1.12.x
+  - 1.13.x
+  - master
+
+before_install:
+  - go get golang.org/x/tools/cmd/cover
+  - go get github.com/mattn/goveralls
+
+before_script:
+  - echo -e "[server]\ninnodb_log_file_size=256MB\ninnodb_buffer_pool_size=512MB\nmax_allowed_packet=16MB" | sudo tee -a /etc/mysql/my.cnf
+  - sudo service mysql restart
+  - .travis/wait_mysql.sh
+  - mysql -e 'create database gotest;'
+
+matrix:
+  include:
+    - env: DB=MYSQL8
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mysql:8.0
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mysql:8.0 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - env: DB=MYSQL57
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mysql:5.7
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mysql:5.7 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - env: DB=MARIA55
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mariadb:5.5
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mariadb:5.5 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - env: DB=MARIA10_1
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mariadb:10.1
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mariadb:10.1 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - os: osx
+      osx_image: xcode10.1
+      addons:
+        homebrew:
+          packages:
+            - mysql
+          update: true
+      go: 1.12.x
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+      before_script:
+        - echo -e "[server]\ninnodb_log_file_size=256MB\ninnodb_buffer_pool_size=512MB\nmax_allowed_packet=16MB\nlocal_infile=1" >> /usr/local/etc/my.cnf
+        - mysql.server start
+        - mysql -uroot -e 'CREATE USER gotest IDENTIFIED BY "secret"'
+        - mysql -uroot -e 'GRANT ALL ON *.* TO gotest'
+        - mysql -uroot -e 'create database gotest;'
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3306
+        - export MYSQL_TEST_CONCURRENT=1
+
+script:
+  - go test -v -covermode=count -coverprofile=coverage.out
+  - go vet ./...
+  - .travis/gofmt.sh
+after_script:
+  - $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci

vendor/github.com/go-sql-driver/mysql/AUTHORS

@@ -0,0 +1,105 @@
+# This is the official list of Go-MySQL-Driver authors for copyright purposes.
+
+# If you are submitting a patch, please add your name or the name of the
+# organization which holds the copyright to this list in alphabetical order.
+
+# Names should be added to this file as
+#	Name <email address>
+# The email address is not required for organizations.
+# Please keep the list sorted.
+
+
+# Individual Persons
+
+Aaron Hopkins <go-sql-driver at die.net>
+Achille Roussel <achille.roussel at gmail.com>
+Alexey Palazhchenko <alexey.palazhchenko at gmail.com>
+Andrew Reid <andrew.reid at tixtrack.com>
+Arne Hormann <arnehormann at gmail.com>
+Asta Xie <xiemengjun at gmail.com>
+Bulat Gaifullin <gaifullinbf at gmail.com>
+Carlos Nieto <jose.carlos at menteslibres.net>
+Chris Moos <chris at tech9computers.com>
+Craig Wilson <craiggwilson at gmail.com>
+Daniel Montoya <dsmontoyam at gmail.com>
+Daniel Nichter <nil at codenode.com>
+Daniël van Eeden <git at myname.nl>
+Dave Protasowski <dprotaso at gmail.com>
+DisposaBoy <disposaboy at dby.me>
+Egor Smolyakov <egorsmkv at gmail.com>
+Erwan Martin <hello at erwan.io>
+Evan Shaw <evan at vendhq.com>
+Frederick Mayle <frederickmayle at gmail.com>
+Gustavo Kristic <gkristic at gmail.com>
+Hajime Nakagami <nakagami at gmail.com>
+Hanno Braun <mail at hannobraun.com>
+Henri Yandell <flamefew at gmail.com>
+Hirotaka Yamamoto <ymmt2005 at gmail.com>
+Huyiguang <hyg at webterren.com>
+ICHINOSE Shogo <shogo82148 at gmail.com>
+Ilia Cimpoes <ichimpoesh at gmail.com>
+INADA Naoki <songofacandy at gmail.com>
+Jacek Szwec <szwec.jacek at gmail.com>
+James Harr <james.harr at gmail.com>
+Jeff Hodges <jeff at somethingsimilar.com>
+Jeffrey Charles <jeffreycharles at gmail.com>
+Jerome Meyer <jxmeyer at gmail.com>
+Jiajia Zhong <zhong2plus at gmail.com>
+Jian Zhen <zhenjl at gmail.com>
+Joshua Prunier <joshua.prunier at gmail.com>
+Julien Lefevre <julien.lefevr at gmail.com>
+Julien Schmidt <go-sql-driver at julienschmidt.com>
+Justin Li <jli at j-li.net>
+Justin Nuß <nuss.justin at gmail.com>
+Kamil Dziedzic <kamil at klecza.pl>
+Kevin Malachowski <kevin at chowski.com>
+Kieron Woodhouse <kieron.woodhouse at infosum.com>
+Lennart Rudolph <lrudolph at hmc.edu>
+Leonardo YongUk Kim <dalinaum at gmail.com>
+Linh Tran Tuan <linhduonggnu at gmail.com>
+Lion Yang <lion at aosc.xyz>
+Luca Looz <luca.looz92 at gmail.com>
+Lucas Liu <extrafliu at gmail.com>
+Luke Scott <luke at webconnex.com>
+Maciej Zimnoch <maciej.zimnoch at codilime.com>
+Michael Woolnough <michael.woolnough at gmail.com>
+Nathanial Murphy <nathanial.murphy at gmail.com>
+Nicola Peduzzi <thenikso at gmail.com>
+Olivier Mengué <dolmen at cpan.org>
+oscarzhao <oscarzhaosl at gmail.com>
+Paul Bonser <misterpib at gmail.com>
+Peter Schultz <peter.schultz at classmarkets.com>
+Rebecca Chin <rchin at pivotal.io>
+Reed Allman <rdallman10 at gmail.com>
+Richard Wilkes <wilkes at me.com>
+Robert Russell <robert at rrbrussell.com>
+Runrioter Wung <runrioter at gmail.com>
+Shuode Li <elemount at qq.com>
+Simon J Mudd <sjmudd at pobox.com>
+Soroush Pour <me at soroushjp.com>
+Stan Putrya <root.vagner at gmail.com>
+Stanley Gunawan <gunawan.stanley at gmail.com>
+Steven Hartland <steven.hartland at multiplay.co.uk>
+Thomas Wodarek <wodarekwebpage at gmail.com>
+Tim Ruffles <timruffles at gmail.com>
+Tom Jenkinson <tom at tjenkinson.me>
+Vladimir Kovpak <cn007b at gmail.com>
+Xiangyu Hu <xiangyu.hu at outlook.com>
+Xiaobing Jiang <s7v7nislands at gmail.com>
+Xiuming Chen <cc at cxm.cc>
+Zhenye Xie <xiezhenye at gmail.com>
+
+# Organizations
+
+Barracuda Networks, Inc.
+Counting Ltd.
+DigitalOcean Inc.
+Facebook Inc.
+GitHub Inc.
+Google Inc.
+InfoSum Ltd.
+Keybase Inc.
+Multiplay Ltd.
+Percona LLC
+Pivotal Inc.
+Stripe Inc.

vendor/github.com/go-sql-driver/mysql/CHANGELOG.md

@@ -0,0 +1,206 @@
+## Version 1.5 (2020-01-07)
+
+Changes:
+
+  - Dropped support Go 1.9 and lower (#823, #829, #886, #1016, #1017)
+  - Improve buffer handling (#890)
+  - Document potentially insecure TLS configs (#901)
+  - Use a double-buffering scheme to prevent data races (#943)
+  - Pass uint64 values without converting them to string (#838, #955)
+  - Update collations and make utf8mb4 default (#877, #1054)
+  - Make NullTime compatible with sql.NullTime in Go 1.13+ (#995)
+  - Removed CloudSQL support (#993, #1007)
+  - Add Go Module support (#1003)
+
+New Features:
+
+  - Implement support of optional TLS (#900)
+  - Check connection liveness (#934, #964, #997, #1048, #1051, #1052)
+  - Implement Connector Interface (#941, #958, #1020, #1035)
+
+Bugfixes:
+
+  - Mark connections as bad on error during ping (#875)
+  - Mark connections as bad on error during dial (#867)
+  - Fix connection leak caused by rapid context cancellation (#1024)
+  - Mark connections as bad on error during Conn.Prepare (#1030)
+
+
+## Version 1.4.1 (2018-11-14)
+
+Bugfixes:
+
+ - Fix TIME format for binary columns (#818)
+ - Fix handling of empty auth plugin names (#835)
+ - Fix caching_sha2_password with empty password (#826)
+ - Fix canceled context broke mysqlConn (#862)
+ - Fix OldAuthSwitchRequest support (#870)
+ - Fix Auth Response packet for cleartext password (#887)
+
+## Version 1.4 (2018-06-03)
+
+Changes:
+
+ - Documentation fixes (#530, #535, #567)
+ - Refactoring (#575, #579, #580, #581, #603, #615, #704)
+ - Cache column names (#444)
+ - Sort the DSN parameters in DSNs generated from a config (#637)
+ - Allow native password authentication by default (#644)
+ - Use the default port if it is missing in the DSN (#668)
+ - Removed the `strict` mode (#676)
+ - Do not query `max_allowed_packet` by default (#680)
+ - Dropped support Go 1.6 and lower (#696)
+ - Updated `ConvertValue()` to match the database/sql/driver implementation (#760)
+ - Document the usage of `0000-00-00T00:00:00` as the time.Time zero value (#783)
+ - Improved the compatibility of the authentication system (#807)
+
+New Features:
+
+ - Multi-Results support (#537)
+ - `rejectReadOnly` DSN option (#604)
+ - `context.Context` support (#608, #612, #627, #761)
+ - Transaction isolation level support (#619, #744)
+ - Read-Only transactions support (#618, #634)
+ - `NewConfig` function which initializes a config with default values (#679)
+ - Implemented the `ColumnType` interfaces (#667, #724)
+ - Support for custom string types in `ConvertValue` (#623)
+ - Implemented `NamedValueChecker`, improving support for uint64 with high bit set (#690, #709, #710)
+ - `caching_sha2_password` authentication plugin support (#794, #800, #801, #802)
+ - Implemented `driver.SessionResetter` (#779)
+ - `sha256_password` authentication plugin support (#808)
+
+Bugfixes:
+
+ - Use the DSN hostname as TLS default ServerName if `tls=true` (#564, #718)
+ - Fixed LOAD LOCAL DATA INFILE for empty files (#590)
+ - Removed columns definition cache since it sometimes cached invalid data (#592)
+ - Don't mutate registered TLS configs (#600)
+ - Make RegisterTLSConfig concurrency-safe (#613)
+ - Handle missing auth data in the handshake packet correctly (#646)
+ - Do not retry queries when data was written to avoid data corruption (#302, #736)
+ - Cache the connection pointer for error handling before invalidating it (#678)
+ - Fixed imports for appengine/cloudsql (#700)
+ - Fix sending STMT_LONG_DATA for 0 byte data (#734)
+ - Set correct capacity for []bytes read from length-encoded strings (#766)
+ - Make RegisterDial concurrency-safe (#773)
+
+
+## Version 1.3 (2016-12-01)
+
+Changes:
+
+ - Go 1.1 is no longer supported
+ - Use decimals fields in MySQL to format time types (#249)
+ - Buffer optimizations (#269)
+ - TLS ServerName defaults to the host (#283)
+ - Refactoring (#400, #410, #437)
+ - Adjusted documentation for second generation CloudSQL (#485)
+ - Documented DSN system var quoting rules (#502)
+ - Made statement.Close() calls idempotent to avoid errors in Go 1.6+ (#512)
+
+New Features:
+
+ - Enable microsecond resolution on TIME, DATETIME and TIMESTAMP (#249)
+ - Support for returning table alias on Columns() (#289, #359, #382)
+ - Placeholder interpolation, can be actived with the DSN parameter `interpolateParams=true` (#309, #318, #490)
+ - Support for uint64 parameters with high bit set (#332, #345)
+ - Cleartext authentication plugin support (#327)
+ - Exported ParseDSN function and the Config struct (#403, #419, #429)
+ - Read / Write timeouts (#401)
+ - Support for JSON field type (#414)
+ - Support for multi-statements and multi-results (#411, #431)
+ - DSN parameter to set the driver-side max_allowed_packet value manually (#489)
+ - Native password authentication plugin support (#494, #524)
+
+Bugfixes:
+
+ - Fixed handling of queries without columns and rows (#255)
+ - Fixed a panic when SetKeepAlive() failed (#298)
+ - Handle ERR packets while reading rows (#321)
+ - Fixed reading NULL length-encoded integers in MySQL 5.6+ (#349)
+ - Fixed absolute paths support in LOAD LOCAL DATA INFILE (#356)
+ - Actually zero out bytes in handshake response (#378)
+ - Fixed race condition in registering LOAD DATA INFILE handler (#383)
+ - Fixed tests with MySQL 5.7.9+ (#380)
+ - QueryUnescape TLS config names (#397)
+ - Fixed "broken pipe" error by writing to closed socket (#390)
+ - Fixed LOAD LOCAL DATA INFILE buffering (#424)
+ - Fixed parsing of floats into float64 when placeholders are used (#434)
+ - Fixed DSN tests with Go 1.7+ (#459)
+ - Handle ERR packets while waiting for EOF (#473)
+ - Invalidate connection on error while discarding additional results (#513)
+ - Allow terminating packets of length 0 (#516)
+
+
+## Version 1.2 (2014-06-03)
+
+Changes:
+
+ - We switched back to a "rolling release". `go get` installs the current master branch again
+ - Version v1 of the driver will not be maintained anymore. Go 1.0 is no longer supported by this driver
+ - Exported errors to allow easy checking from application code
+ - Enabled TCP Keepalives on TCP connections
+ - Optimized INFILE handling (better buffer size calculation, lazy init, ...)
+ - The DSN parser also checks for a missing separating slash
+ - Faster binary date / datetime to string formatting
+ - Also exported the MySQLWarning type
+ - mysqlConn.Close returns the first error encountered instead of ignoring all errors
+ - writePacket() automatically writes the packet size to the header
+ - readPacket() uses an iterative approach instead of the recursive approach to merge splitted packets
+
+New Features:
+
+ - `RegisterDial` allows the usage of a custom dial function to establish the network connection
+ - Setting the connection collation is possible with the `collation` DSN parameter. This parameter should be preferred over the `charset` parameter
+ - Logging of critical errors is configurable with `SetLogger`
+ - Google CloudSQL support
+
+Bugfixes:
+
+ - Allow more than 32 parameters in prepared statements
+ - Various old_password fixes
+ - Fixed TestConcurrent test to pass Go's race detection
+ - Fixed appendLengthEncodedInteger for large numbers
+ - Renamed readLengthEnodedString to readLengthEncodedString and skipLengthEnodedString to skipLengthEncodedString (fixed typo)
+
+
+## Version 1.1 (2013-11-02)
+
+Changes:
+
+  - Go-MySQL-Driver now requires Go 1.1
+  - Connections now use the collation `utf8_general_ci` by default. Adding `&charset=UTF8` to the DSN should not be necessary anymore
+  - Made closing rows and connections error tolerant. This allows for example deferring rows.Close() without checking for errors
+  - `[]byte(nil)` is now treated as a NULL value. Before, it was treated like an empty string / `[]byte("")`
+  - DSN parameter values must now be url.QueryEscape'ed. This allows text values to contain special characters, such as '&'.
+  - Use the IO buffer also for writing. This results in zero allocations (by the driver) for most queries
+  - Optimized the buffer for reading
+  - stmt.Query now caches column metadata
+  - New Logo
+  - Changed the copyright header to include all contributors
+  - Improved the LOAD INFILE documentation
+  - The driver struct is now exported to make the driver directly accessible
+  - Refactored the driver tests
+  - Added more benchmarks and moved all to a separate file
+  - Other small refactoring
+
+New Features:
+
+  - Added *old_passwords* support: Required in some cases, but must be enabled by adding `allowOldPasswords=true` to the DSN since it is insecure
+  - Added a `clientFoundRows` parameter: Return the number of matching rows instead of the number of rows changed on UPDATEs
+  - Added TLS/SSL support: Use a TLS/SSL encrypted connection to the server. Custom TLS configs can be registered and used
+
+Bugfixes:
+
+  - Fixed MySQL 4.1 support: MySQL 4.1 sends packets with lengths which differ from the specification
+  - Convert to DB timezone when inserting `time.Time`
+  - Splitted packets (more than 16MB) are now merged correctly
+  - Fixed false positive `io.EOF` errors when the data was fully read
+  - Avoid panics on reuse of closed connections
+  - Fixed empty string producing false nil values
+  - Fixed sign byte for positive TIME fields
+
+
+## Version 1.0 (2013-05-14)
+
+Initial Release

vendor/github.com/go-sql-driver/mysql/LICENSE

@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

vendor/github.com/go-sql-driver/mysql/README.md

@@ -0,0 +1,501 @@
+# Go-MySQL-Driver
+
+A MySQL-Driver for Go's [database/sql](https://golang.org/pkg/database/sql/) package
+
+![Go-MySQL-Driver logo](https://raw.github.com/wiki/go-sql-driver/mysql/gomysql_m.png "Golang Gopher holding the MySQL Dolphin")
+
+---------------------------------------
+  * [Features](#features)
+  * [Requirements](#requirements)
+  * [Installation](#installation)
+  * [Usage](#usage)
+    * [DSN (Data Source Name)](#dsn-data-source-name)
+      * [Password](#password)
+      * [Protocol](#protocol)
+      * [Address](#address)
+      * [Parameters](#parameters)
+      * [Examples](#examples)
+    * [Connection pool and timeouts](#connection-pool-and-timeouts)
+    * [context.Context Support](#contextcontext-support)
+    * [ColumnType Support](#columntype-support)
+    * [LOAD DATA LOCAL INFILE support](#load-data-local-infile-support)
+    * [time.Time support](#timetime-support)
+    * [Unicode support](#unicode-support)
+  * [Testing / Development](#testing--development)
+  * [License](#license)
+
+---------------------------------------
+
+## Features
+  * Lightweight and [fast](https://github.com/go-sql-driver/sql-benchmark "golang MySQL-Driver performance")
+  * Native Go implementation. No C-bindings, just pure Go
+  * Connections over TCP/IPv4, TCP/IPv6, Unix domain sockets or [custom protocols](https://godoc.org/github.com/go-sql-driver/mysql#DialFunc)
+  * Automatic handling of broken connections
+  * Automatic Connection Pooling *(by database/sql package)*
+  * Supports queries larger than 16MB
+  * Full [`sql.RawBytes`](https://golang.org/pkg/database/sql/#RawBytes) support.
+  * Intelligent `LONG DATA` handling in prepared statements
+  * Secure `LOAD DATA LOCAL INFILE` support with file Whitelisting and `io.Reader` support
+  * Optional `time.Time` parsing
+  * Optional placeholder interpolation
+
+## Requirements
+  * Go 1.10 or higher. We aim to support the 3 latest versions of Go.
+  * MySQL (4.1+), MariaDB, Percona Server, Google CloudSQL or Sphinx (2.2.3+)
+
+---------------------------------------
+
+## Installation
+Simple install the package to your [$GOPATH](https://github.com/golang/go/wiki/GOPATH "GOPATH") with the [go tool](https://golang.org/cmd/go/ "go command") from shell:
+```bash
+$ go get -u github.com/go-sql-driver/mysql
+```
+Make sure [Git is installed](https://git-scm.com/downloads) on your machine and in your system's `PATH`.
+
+## Usage
+_Go MySQL Driver_ is an implementation of Go's `database/sql/driver` interface. You only need to import the driver and can use the full [`database/sql`](https://golang.org/pkg/database/sql/) API then.
+
+Use `mysql` as `driverName` and a valid [DSN](#dsn-data-source-name)  as `dataSourceName`:
+```go
+import "database/sql"
+import _ "github.com/go-sql-driver/mysql"
+
+db, err := sql.Open("mysql", "user:password@/dbname")
+```
+
+[Examples are available in our Wiki](https://github.com/go-sql-driver/mysql/wiki/Examples "Go-MySQL-Driver Examples").
+
+
+### DSN (Data Source Name)
+
+The Data Source Name has a common format, like e.g. [PEAR DB](http://pear.php.net/manual/en/package.database.db.intro-dsn.php) uses it, but without type-prefix (optional parts marked by squared brackets):
+```
+[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...&paramN=valueN]
+```
+
+A DSN in its fullest form:
+```
+username:password@protocol(address)/dbname?param=value
+```
+
+Except for the databasename, all values are optional. So the minimal DSN is:
+```
+/dbname
+```
+
+If you do not want to preselect a database, leave `dbname` empty:
+```
+/
+```
+This has the same effect as an empty DSN string:
+```
+
+```
+
+Alternatively, [Config.FormatDSN](https://godoc.org/github.com/go-sql-driver/mysql#Config.FormatDSN) can be used to create a DSN string by filling a struct.
+
+#### Password
+Passwords can consist of any character. Escaping is **not** necessary.
+
+#### Protocol
+See [net.Dial](https://golang.org/pkg/net/#Dial) for more information which networks are available.
+In general you should use an Unix domain socket if available and TCP otherwise for best performance.
+
+#### Address
+For TCP and UDP networks, addresses have the form `host[:port]`.
+If `port` is omitted, the default port will be used.
+If `host` is a literal IPv6 address, it must be enclosed in square brackets.
+The functions [net.JoinHostPort](https://golang.org/pkg/net/#JoinHostPort) and [net.SplitHostPort](https://golang.org/pkg/net/#SplitHostPort) manipulate addresses in this form.
+
+For Unix domain sockets the address is the absolute path to the MySQL-Server-socket, e.g. `/var/run/mysqld/mysqld.sock` or `/tmp/mysql.sock`.
+
+#### Parameters
+*Parameters are case-sensitive!*
+
+Notice that any of `true`, `TRUE`, `True` or `1` is accepted to stand for a true boolean value. Not surprisingly, false can be specified as any of: `false`, `FALSE`, `False` or `0`.
+
+##### `allowAllFiles`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`allowAllFiles=true` disables the file Whitelist for `LOAD DATA LOCAL INFILE` and allows *all* files.
+[*Might be insecure!*](http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html)
+
+##### `allowCleartextPasswords`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`allowCleartextPasswords=true` allows using the [cleartext client side plugin](http://dev.mysql.com/doc/en/cleartext-authentication-plugin.html) if required by an account, such as one defined with the [PAM authentication plugin](http://dev.mysql.com/doc/en/pam-authentication-plugin.html). Sending passwords in clear text may be a security problem in some configurations. To avoid problems if there is any possibility that the password would be intercepted, clients should connect to MySQL Server using a method that protects the password. Possibilities include [TLS / SSL](#tls), IPsec, or a private network.
+
+##### `allowNativePasswords`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        true
+```
+`allowNativePasswords=false` disallows the usage of MySQL native password method.
+
+##### `allowOldPasswords`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+`allowOldPasswords=true` allows the usage of the insecure old password method. This should be avoided, but is necessary in some cases. See also [the old_passwords wiki page](https://github.com/go-sql-driver/mysql/wiki/old_passwords).
+
+##### `charset`
+
+```
+Type:           string
+Valid Values:   <name>
+Default:        none
+```
+
+Sets the charset used for client-server interaction (`"SET NAMES <value>"`). If multiple charsets are set (separated by a comma), the following charset is used if setting the charset failes. This enables for example support for `utf8mb4` ([introduced in MySQL 5.5.3](http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html)) with fallback to `utf8` for older servers (`charset=utf8mb4,utf8`).
+
+Usage of the `charset` parameter is discouraged because it issues additional queries to the server.
+Unless you need the fallback behavior, please use `collation` instead.
+
+##### `checkConnLiveness`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        true
+```
+
+On supported platforms connections retrieved from the connection pool are checked for liveness before using them. If the check fails, the respective connection is marked as bad and the query retried with another connection.
+`checkConnLiveness=false` disables this liveness check of connections.
+
+##### `collation`
+
+```
+Type:           string
+Valid Values:   <name>
+Default:        utf8mb4_general_ci
+```
+
+Sets the collation used for client-server interaction on connection. In contrast to `charset`, `collation` does not issue additional queries. If the specified collation is unavailable on the target server, the connection will fail.
+
+A list of valid charsets for a server is retrievable with `SHOW COLLATION`.
+
+The default collation (`utf8mb4_general_ci`) is supported from MySQL 5.5.  You should use an older collation (e.g. `utf8_general_ci`) for older MySQL.
+
+Collations for charset "ucs2", "utf16", "utf16le", and "utf32" can not be used ([ref](https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html#charset-connection-impermissible-client-charset)).
+
+
+##### `clientFoundRows`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`clientFoundRows=true` causes an UPDATE to return the number of matching rows instead of the number of rows changed.
+
+##### `columnsWithAlias`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+When `columnsWithAlias` is true, calls to `sql.Rows.Columns()` will return the table alias and the column name separated by a dot. For example:
+
+```
+SELECT u.id FROM users as u
+```
+
+will return `u.id` instead of just `id` if `columnsWithAlias=true`.
+
+##### `interpolateParams`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+If `interpolateParams` is true, placeholders (`?`) in calls to `db.Query()` and `db.Exec()` are interpolated into a single query string with given parameters. This reduces the number of roundtrips, since the driver has to prepare a statement, execute it with given parameters and close the statement again with `interpolateParams=false`.
+
+*This can not be used together with the multibyte encodings BIG5, CP932, GB2312, GBK or SJIS. These are blacklisted as they may [introduce a SQL injection vulnerability](http://stackoverflow.com/a/12118602/3430118)!*
+
+##### `loc`
+
+```
+Type:           string
+Valid Values:   <escaped name>
+Default:        UTC
+```
+
+Sets the location for time.Time values (when using `parseTime=true`). *"Local"* sets the system's location. See [time.LoadLocation](https://golang.org/pkg/time/#LoadLocation) for details.
+
+Note that this sets the location for time.Time values but does not change MySQL's [time_zone setting](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html). For that see the [time_zone system variable](#system-variables), which can also be set as a DSN parameter.
+
+Please keep in mind, that param values must be [url.QueryEscape](https://golang.org/pkg/net/url/#QueryEscape)'ed. Alternatively you can manually replace the `/` with `%2F`. For example `US/Pacific` would be `loc=US%2FPacific`.
+
+##### `maxAllowedPacket`
+```
+Type:          decimal number
+Default:       4194304
+```
+
+Max packet size allowed in bytes. The default value is 4 MiB and should be adjusted to match the server settings. `maxAllowedPacket=0` can be used to automatically fetch the `max_allowed_packet` variable from server *on every connection*.
+
+##### `multiStatements`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+Allow multiple statements in one query. While this allows batch queries, it also greatly increases the risk of SQL injections. Only the result of the first query is returned, all other results are silently discarded.
+
+When `multiStatements` is used, `?` parameters must only be used in the first statement.
+
+##### `parseTime`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`parseTime=true` changes the output type of `DATE` and `DATETIME` values to `time.Time` instead of `[]byte` / `string`
+The date or datetime like `0000-00-00 00:00:00` is converted into zero value of `time.Time`.
+
+
+##### `readTimeout`
+
+```
+Type:           duration
+Default:        0
+```
+
+I/O read timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.
+
+##### `rejectReadOnly`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+
+`rejectReadOnly=true` causes the driver to reject read-only connections. This
+is for a possible race condition during an automatic failover, where the mysql
+client gets connected to a read-only replica after the failover.
+
+Note that this should be a fairly rare case, as an automatic failover normally
+happens when the primary is down, and the race condition shouldn't happen
+unless it comes back up online as soon as the failover is kicked off. On the
+other hand, when this happens, a MySQL application can get stuck on a
+read-only connection until restarted. It is however fairly easy to reproduce,
+for example, using a manual failover on AWS Aurora's MySQL-compatible cluster.
+
+If you are not relying on read-only transactions to reject writes that aren't
+supposed to happen, setting this on some MySQL providers (such as AWS Aurora)
+is safer for failovers.
+
+Note that ERROR 1290 can be returned for a `read-only` server and this option will
+cause a retry for that error. However the same error number is used for some
+other cases. You should ensure your application will never cause an ERROR 1290
+except for `read-only` mode when enabling this option.
+
+
+##### `serverPubKey`
+
+```
+Type:           string
+Valid Values:   <name>
+Default:        none
+```
+
+Server public keys can be registered with [`mysql.RegisterServerPubKey`](https://godoc.org/github.com/go-sql-driver/mysql#RegisterServerPubKey), which can then be used by the assigned name in the DSN.
+Public keys are used to transmit encrypted data, e.g. for authentication.
+If the server's public key is known, it should be set manually to avoid expensive and potentially insecure transmissions of the public key from the server to the client each time it is required.
+
+
+##### `timeout`
+
+```
+Type:           duration
+Default:        OS default
+```
+
+Timeout for establishing connections, aka dial timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.
+
+
+##### `tls`
+
+```
+Type:           bool / string
+Valid Values:   true, false, skip-verify, preferred, <name>
+Default:        false
+```
+
+`tls=true` enables TLS / SSL encrypted connection to the server. Use `skip-verify` if you want to use a self-signed or invalid certificate (server side) or use `preferred` to use TLS only when advertised by the server. This is similar to `skip-verify`, but additionally allows a fallback to a connection which is not encrypted. Neither `skip-verify` nor `preferred` add any reliable security. You can use a custom TLS config after registering it with [`mysql.RegisterTLSConfig`](https://godoc.org/github.com/go-sql-driver/mysql#RegisterTLSConfig).
+
+
+##### `writeTimeout`
+
+```
+Type:           duration
+Default:        0
+```
+
+I/O write timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.
+
+
+##### System Variables
+
+Any other parameters are interpreted as system variables:
+  * `<boolean_var>=<value>`: `SET <boolean_var>=<value>`
+  * `<enum_var>=<value>`: `SET <enum_var>=<value>`
+  * `<string_var>=%27<value>%27`: `SET <string_var>='<value>'`
+
+Rules:
+* The values for string variables must be quoted with `'`.
+* The values must also be [url.QueryEscape](http://golang.org/pkg/net/url/#QueryEscape)'ed!
+ (which implies values of string variables must be wrapped with `%27`).
+
+Examples:
+  * `autocommit=1`: `SET autocommit=1`
+  * [`time_zone=%27Europe%2FParis%27`](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html): `SET time_zone='Europe/Paris'`
+  * [`tx_isolation=%27REPEATABLE-READ%27`](https://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html#sysvar_tx_isolation): `SET tx_isolation='REPEATABLE-READ'`
+
+
+#### Examples
+```
+user@unix(/path/to/socket)/dbname
+```
+
+```
+root:pw@unix(/tmp/mysql.sock)/myDatabase?loc=Local
+```
+
+```
+user:password@tcp(localhost:5555)/dbname?tls=skip-verify&autocommit=true
+```
+
+Treat warnings as errors by setting the system variable [`sql_mode`](https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html):
+```
+user:password@/dbname?sql_mode=TRADITIONAL
+```
+
+TCP via IPv6:
+```
+user:password@tcp([de:ad:be:ef::ca:fe]:80)/dbname?timeout=90s&collation=utf8mb4_unicode_ci
+```
+
+TCP on a remote host, e.g. Amazon RDS:
+```
+id:password@tcp(your-amazonaws-uri.com:3306)/dbname
+```
+
+Google Cloud SQL on App Engine:
+```
+user:password@unix(/cloudsql/project-id:region-name:instance-name)/dbname
+```
+
+TCP using default port (3306) on localhost:
+```
+user:password@tcp/dbname?charset=utf8mb4,utf8&sys_var=esc%40ped
+```
+
+Use the default protocol (tcp) and host (localhost:3306):
+```
+user:password@/dbname
+```
+
+No Database preselected:
+```
+user:password@/
+```
+
+
+### Connection pool and timeouts
+The connection pool is managed by Go's database/sql package. For details on how to configure the size of the pool and how long connections stay in the pool see `*DB.SetMaxOpenConns`, `*DB.SetMaxIdleConns`, and `*DB.SetConnMaxLifetime` in the [database/sql documentation](https://golang.org/pkg/database/sql/). The read, write, and dial timeouts for each individual connection are configured with the DSN parameters [`readTimeout`](#readtimeout), [`writeTimeout`](#writetimeout), and [`timeout`](#timeout), respectively.
+
+## `ColumnType` Support
+This driver supports the [`ColumnType` interface](https://golang.org/pkg/database/sql/#ColumnType) introduced in Go 1.8, with the exception of [`ColumnType.Length()`](https://golang.org/pkg/database/sql/#ColumnType.Length), which is currently not supported.
+
+## `context.Context` Support
+Go 1.8 added `database/sql` support for `context.Context`. This driver supports query timeouts and cancellation via contexts.
+See [context support in the database/sql package](https://golang.org/doc/go1.8#database_sql) for more details.
+
+
+### `LOAD DATA LOCAL INFILE` support
+For this feature you need direct access to the package. Therefore you must change the import path (no `_`):
+```go
+import "github.com/go-sql-driver/mysql"
+```
+
+Files must be whitelisted by registering them with `mysql.RegisterLocalFile(filepath)` (recommended) or the Whitelist check must be deactivated by using the DSN parameter `allowAllFiles=true` ([*Might be insecure!*](http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html)).
+
+To use a `io.Reader` a handler function must be registered with `mysql.RegisterReaderHandler(name, handler)` which returns a `io.Reader` or `io.ReadCloser`. The Reader is available with the filepath `Reader::<name>` then. Choose different names for different handlers and `DeregisterReaderHandler` when you don't need it anymore.
+
+See the [godoc of Go-MySQL-Driver](https://godoc.org/github.com/go-sql-driver/mysql "golang mysql driver documentation") for details.
+
+
+### `time.Time` support
+The default internal output type of MySQL `DATE` and `DATETIME` values is `[]byte` which allows you to scan the value into a `[]byte`, `string` or `sql.RawBytes` variable in your program.
+
+However, many want to scan MySQL `DATE` and `DATETIME` values into `time.Time` variables, which is the logical equivalent in Go to `DATE` and `DATETIME` in MySQL. You can do that by changing the internal output type from `[]byte` to `time.Time` with the DSN parameter `parseTime=true`. You can set the default [`time.Time` location](https://golang.org/pkg/time/#Location) with the `loc` DSN parameter.
+
+**Caution:** As of Go 1.1, this makes `time.Time` the only variable type you can scan `DATE` and `DATETIME` values into. This breaks for example [`sql.RawBytes` support](https://github.com/go-sql-driver/mysql/wiki/Examples#rawbytes).
+
+Alternatively you can use the [`NullTime`](https://godoc.org/github.com/go-sql-driver/mysql#NullTime) type as the scan destination, which works with both `time.Time` and `string` / `[]byte`.
+
+
+### Unicode support
+Since version 1.5 Go-MySQL-Driver automatically uses the collation ` utf8mb4_general_ci` by default.
+
+Other collations / charsets can be set using the [`collation`](#collation) DSN parameter.
+
+Version 1.0 of the driver recommended adding `&charset=utf8` (alias for `SET NAMES utf8`) to the DSN to enable proper UTF-8 support. This is not necessary anymore. The [`collation`](#collation) parameter should be preferred to set another collation / charset than the default.
+
+See http://dev.mysql.com/doc/refman/8.0/en/charset-unicode.html for more details on MySQL's Unicode support.
+
+## Testing / Development
+To run the driver tests you may need to adjust the configuration. See the [Testing Wiki-Page](https://github.com/go-sql-driver/mysql/wiki/Testing "Testing") for details.
+
+Go-MySQL-Driver is not feature-complete yet. Your help is very appreciated.
+If you want to contribute, you can work on an [open issue](https://github.com/go-sql-driver/mysql/issues?state=open) or review a [pull request](https://github.com/go-sql-driver/mysql/pulls).
+
+See the [Contribution Guidelines](https://github.com/go-sql-driver/mysql/blob/master/CONTRIBUTING.md) for details.
+
+---------------------------------------
+
+## License
+Go-MySQL-Driver is licensed under the [Mozilla Public License Version 2.0](https://raw.github.com/go-sql-driver/mysql/master/LICENSE)
+
+Mozilla summarizes the license scope as follows:
+> MPL: The copyleft applies to any files containing MPLed code.
+
+
+That means:
+  * You can **use** the **unchanged** source code both in private and commercially.
+  * When distributing, you **must publish** the source code of any **changed files** licensed under the MPL 2.0 under a) the MPL 2.0 itself or b) a compatible license (e.g. GPL 3.0 or Apache License 2.0).
+  * You **needn't publish** the source code of your library as long as the files licensed under the MPL 2.0 are **unchanged**.
+
+Please read the [MPL 2.0 FAQ](https://www.mozilla.org/en-US/MPL/2.0/FAQ/) if you have further questions regarding the license.
+
+You can read the full terms here: [LICENSE](https://raw.github.com/go-sql-driver/mysql/master/LICENSE).
+
+![Go Gopher and MySQL Dolphin](https://raw.github.com/wiki/go-sql-driver/mysql/go-mysql-driver_m.jpg "Golang Gopher transporting the MySQL Dolphin in a wheelbarrow")
+

vendor/github.com/go-sql-driver/mysql/auth.go

@@ -0,0 +1,422 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2018 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/pem"
+	"sync"
+)
+
+// server pub keys registry
+var (
+	serverPubKeyLock     sync.RWMutex
+	serverPubKeyRegistry map[string]*rsa.PublicKey
+)
+
+// RegisterServerPubKey registers a server RSA public key which can be used to
+// send data in a secure manner to the server without receiving the public key
+// in a potentially insecure way from the server first.
+// Registered keys can afterwards be used adding serverPubKey=<name> to the DSN.
+//
+// Note: The provided rsa.PublicKey instance is exclusively owned by the driver
+// after registering it and may not be modified.
+//
+//  data, err := ioutil.ReadFile("mykey.pem")
+//  if err != nil {
+//  	log.Fatal(err)
+//  }
+//
+//  block, _ := pem.Decode(data)
+//  if block == nil || block.Type != "PUBLIC KEY" {
+//  	log.Fatal("failed to decode PEM block containing public key")
+//  }
+//
+//  pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+//  if err != nil {
+//  	log.Fatal(err)
+//  }
+//
+//  if rsaPubKey, ok := pub.(*rsa.PublicKey); ok {
+//  	mysql.RegisterServerPubKey("mykey", rsaPubKey)
+//  } else {
+//  	log.Fatal("not a RSA public key")
+//  }
+//
+func RegisterServerPubKey(name string, pubKey *rsa.PublicKey) {
+	serverPubKeyLock.Lock()
+	if serverPubKeyRegistry == nil {
+		serverPubKeyRegistry = make(map[string]*rsa.PublicKey)
+	}
+
+	serverPubKeyRegistry[name] = pubKey
+	serverPubKeyLock.Unlock()
+}
+
+// DeregisterServerPubKey removes the public key registered with the given name.
+func DeregisterServerPubKey(name string) {
+	serverPubKeyLock.Lock()
+	if serverPubKeyRegistry != nil {
+		delete(serverPubKeyRegistry, name)
+	}
+	serverPubKeyLock.Unlock()
+}
+
+func getServerPubKey(name string) (pubKey *rsa.PublicKey) {
+	serverPubKeyLock.RLock()
+	if v, ok := serverPubKeyRegistry[name]; ok {
+		pubKey = v
+	}
+	serverPubKeyLock.RUnlock()
+	return
+}
+
+// Hash password using pre 4.1 (old password) method
+// https://github.com/atcurtis/mariadb/blob/master/mysys/my_rnd.c
+type myRnd struct {
+	seed1, seed2 uint32
+}
+
+const myRndMaxVal = 0x3FFFFFFF
+
+// Pseudo random number generator
+func newMyRnd(seed1, seed2 uint32) *myRnd {
+	return &myRnd{
+		seed1: seed1 % myRndMaxVal,
+		seed2: seed2 % myRndMaxVal,
+	}
+}
+
+// Tested to be equivalent to MariaDB's floating point variant
+// http://play.golang.org/p/QHvhd4qved
+// http://play.golang.org/p/RG0q4ElWDx
+func (r *myRnd) NextByte() byte {
+	r.seed1 = (r.seed1*3 + r.seed2) % myRndMaxVal
+	r.seed2 = (r.seed1 + r.seed2 + 33) % myRndMaxVal
+
+	return byte(uint64(r.seed1) * 31 / myRndMaxVal)
+}
+
+// Generate binary hash from byte string using insecure pre 4.1 method
+func pwHash(password []byte) (result [2]uint32) {
+	var add uint32 = 7
+	var tmp uint32
+
+	result[0] = 1345345333
+	result[1] = 0x12345671
+
+	for _, c := range password {
+		// skip spaces and tabs in password
+		if c == ' ' || c == '\t' {
+			continue
+		}
+
+		tmp = uint32(c)
+		result[0] ^= (((result[0] & 63) + add) * tmp) + (result[0] << 8)
+		result[1] += (result[1] << 8) ^ result[0]
+		add += tmp
+	}
+
+	// Remove sign bit (1<<31)-1)
+	result[0] &= 0x7FFFFFFF
+	result[1] &= 0x7FFFFFFF
+
+	return
+}
+
+// Hash password using insecure pre 4.1 method
+func scrambleOldPassword(scramble []byte, password string) []byte {
+	if len(password) == 0 {
+		return nil
+	}
+
+	scramble = scramble[:8]
+
+	hashPw := pwHash([]byte(password))
+	hashSc := pwHash(scramble)
+
+	r := newMyRnd(hashPw[0]^hashSc[0], hashPw[1]^hashSc[1])
+
+	var out [8]byte
+	for i := range out {
+		out[i] = r.NextByte() + 64
+	}
+
+	mask := r.NextByte()
+	for i := range out {
+		out[i] ^= mask
+	}
+
+	return out[:]
+}
+
+// Hash password using 4.1+ method (SHA1)
+func scramblePassword(scramble []byte, password string) []byte {
+	if len(password) == 0 {
+		return nil
+	}
+
+	// stage1Hash = SHA1(password)
+	crypt := sha1.New()
+	crypt.Write([]byte(password))
+	stage1 := crypt.Sum(nil)
+
+	// scrambleHash = SHA1(scramble + SHA1(stage1Hash))
+	// inner Hash
+	crypt.Reset()
+	crypt.Write(stage1)
+	hash := crypt.Sum(nil)
+
+	// outer Hash
+	crypt.Reset()
+	crypt.Write(scramble)
+	crypt.Write(hash)
+	scramble = crypt.Sum(nil)
+
+	// token = scrambleHash XOR stage1Hash
+	for i := range scramble {
+		scramble[i] ^= stage1[i]
+	}
+	return scramble
+}
+
+// Hash password using MySQL 8+ method (SHA256)
+func scrambleSHA256Password(scramble []byte, password string) []byte {
+	if len(password) == 0 {
+		return nil
+	}
+
+	// XOR(SHA256(password), SHA256(SHA256(SHA256(password)), scramble))
+
+	crypt := sha256.New()
+	crypt.Write([]byte(password))
+	message1 := crypt.Sum(nil)
+
+	crypt.Reset()
+	crypt.Write(message1)
+	message1Hash := crypt.Sum(nil)
+
+	crypt.Reset()
+	crypt.Write(message1Hash)
+	crypt.Write(scramble)
+	message2 := crypt.Sum(nil)
+
+	for i := range message1 {
+		message1[i] ^= message2[i]
+	}
+
+	return message1
+}
+
+func encryptPassword(password string, seed []byte, pub *rsa.PublicKey) ([]byte, error) {
+	plain := make([]byte, len(password)+1)
+	copy(plain, password)
+	for i := range plain {
+		j := i % len(seed)
+		plain[i] ^= seed[j]
+	}
+	sha1 := sha1.New()
+	return rsa.EncryptOAEP(sha1, rand.Reader, pub, plain, nil)
+}
+
+func (mc *mysqlConn) sendEncryptedPassword(seed []byte, pub *rsa.PublicKey) error {
+	enc, err := encryptPassword(mc.cfg.Passwd, seed, pub)
+	if err != nil {
+		return err
+	}
+	return mc.writeAuthSwitchPacket(enc)
+}
+
+func (mc *mysqlConn) auth(authData []byte, plugin string) ([]byte, error) {
+	switch plugin {
+	case "caching_sha2_password":
+		authResp := scrambleSHA256Password(authData, mc.cfg.Passwd)
+		return authResp, nil
+
+	case "mysql_old_password":
+		if !mc.cfg.AllowOldPasswords {
+			return nil, ErrOldPassword
+		}
+		// Note: there are edge cases where this should work but doesn't;
+		// this is currently "wontfix":
+		// https://github.com/go-sql-driver/mysql/issues/184
+		authResp := append(scrambleOldPassword(authData[:8], mc.cfg.Passwd), 0)
+		return authResp, nil
+
+	case "mysql_clear_password":
+		if !mc.cfg.AllowCleartextPasswords {
+			return nil, ErrCleartextPassword
+		}
+		// http://dev.mysql.com/doc/refman/5.7/en/cleartext-authentication-plugin.html
+		// http://dev.mysql.com/doc/refman/5.7/en/pam-authentication-plugin.html
+		return append([]byte(mc.cfg.Passwd), 0), nil
+
+	case "mysql_native_password":
+		if !mc.cfg.AllowNativePasswords {
+			return nil, ErrNativePassword
+		}
+		// https://dev.mysql.com/doc/internals/en/secure-password-authentication.html
+		// Native password authentication only need and will need 20-byte challenge.
+		authResp := scramblePassword(authData[:20], mc.cfg.Passwd)
+		return authResp, nil
+
+	case "sha256_password":
+		if len(mc.cfg.Passwd) == 0 {
+			return []byte{0}, nil
+		}
+		if mc.cfg.tls != nil || mc.cfg.Net == "unix" {
+			// write cleartext auth packet
+			return append([]byte(mc.cfg.Passwd), 0), nil
+		}
+
+		pubKey := mc.cfg.pubKey
+		if pubKey == nil {
+			// request public key from server
+			return []byte{1}, nil
+		}
+
+		// encrypted password
+		enc, err := encryptPassword(mc.cfg.Passwd, authData, pubKey)
+		return enc, err
+
+	default:
+		errLog.Print("unknown auth plugin:", plugin)
+		return nil, ErrUnknownPlugin
+	}
+}
+
+func (mc *mysqlConn) handleAuthResult(oldAuthData []byte, plugin string) error {
+	// Read Result Packet
+	authData, newPlugin, err := mc.readAuthResult()
+	if err != nil {
+		return err
+	}
+
+	// handle auth plugin switch, if requested
+	if newPlugin != "" {
+		// If CLIENT_PLUGIN_AUTH capability is not supported, no new cipher is
+		// sent and we have to keep using the cipher sent in the init packet.
+		if authData == nil {
+			authData = oldAuthData
+		} else {
+			// copy data from read buffer to owned slice
+			copy(oldAuthData, authData)
+		}
+
+		plugin = newPlugin
+
+		authResp, err := mc.auth(authData, plugin)
+		if err != nil {
+			return err
+		}
+		if err = mc.writeAuthSwitchPacket(authResp); err != nil {
+			return err
+		}
+
+		// Read Result Packet
+		authData, newPlugin, err = mc.readAuthResult()
+		if err != nil {
+			return err
+		}
+
+		// Do not allow to change the auth plugin more than once
+		if newPlugin != "" {
+			return ErrMalformPkt
+		}
+	}
+
+	switch plugin {
+
+	// https://insidemysql.com/preparing-your-community-connector-for-mysql-8-part-2-sha256/
+	case "caching_sha2_password":
+		switch len(authData) {
+		case 0:
+			return nil // auth successful
+		case 1:
+			switch authData[0] {
+			case cachingSha2PasswordFastAuthSuccess:
+				if err = mc.readResultOK(); err == nil {
+					return nil // auth successful
+				}
+
+			case cachingSha2PasswordPerformFullAuthentication:
+				if mc.cfg.tls != nil || mc.cfg.Net == "unix" {
+					// write cleartext auth packet
+					err = mc.writeAuthSwitchPacket(append([]byte(mc.cfg.Passwd), 0))
+					if err != nil {
+						return err
+					}
+				} else {
+					pubKey := mc.cfg.pubKey
+					if pubKey == nil {
+						// request public key from server
+						data, err := mc.buf.takeSmallBuffer(4 + 1)
+						if err != nil {
+							return err
+						}
+						data[4] = cachingSha2PasswordRequestPublicKey
+						mc.writePacket(data)
+
+						// parse public key
+						if data, err = mc.readPacket(); err != nil {
+							return err
+						}
+
+						block, _ := pem.Decode(data[1:])
+						pkix, err := x509.ParsePKIXPublicKey(block.Bytes)
+						if err != nil {
+							return err
+						}
+						pubKey = pkix.(*rsa.PublicKey)
+					}
+
+					// send encrypted password
+					err = mc.sendEncryptedPassword(oldAuthData, pubKey)
+					if err != nil {
+						return err
+					}
+				}
+				return mc.readResultOK()
+
+			default:
+				return ErrMalformPkt
+			}
+		default:
+			return ErrMalformPkt
+		}
+
+	case "sha256_password":
+		switch len(authData) {
+		case 0:
+			return nil // auth successful
+		default:
+			block, _ := pem.Decode(authData)
+			pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+			if err != nil {
+				return err
+			}
+
+			// send encrypted password
+			err = mc.sendEncryptedPassword(oldAuthData, pub.(*rsa.PublicKey))
+			if err != nil {
+				return err
+			}
+			return mc.readResultOK()
+		}
+
+	default:
+		return nil // auth successful
+	}
+
+	return err
+}

vendor/github.com/go-sql-driver/mysql/buffer.go

@@ -0,0 +1,182 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"io"
+	"net"
+	"time"
+)
+
+const defaultBufSize = 4096
+const maxCachedBufSize = 256 * 1024
+
+// A buffer which is used for both reading and writing.
+// This is possible since communication on each connection is synchronous.
+// In other words, we can't write and read simultaneously on the same connection.
+// The buffer is similar to bufio.Reader / Writer but zero-copy-ish
+// Also highly optimized for this particular use case.
+// This buffer is backed by two byte slices in a double-buffering scheme
+type buffer struct {
+	buf     []byte // buf is a byte buffer who's length and capacity are equal.
+	nc      net.Conn
+	idx     int
+	length  int
+	timeout time.Duration
+	dbuf    [2][]byte // dbuf is an array with the two byte slices that back this buffer
+	flipcnt uint      // flipccnt is the current buffer counter for double-buffering
+}
+
+// newBuffer allocates and returns a new buffer.
+func newBuffer(nc net.Conn) buffer {
+	fg := make([]byte, defaultBufSize)
+	return buffer{
+		buf:  fg,
+		nc:   nc,
+		dbuf: [2][]byte{fg, nil},
+	}
+}
+
+// flip replaces the active buffer with the background buffer
+// this is a delayed flip that simply increases the buffer counter;
+// the actual flip will be performed the next time we call `buffer.fill`
+func (b *buffer) flip() {
+	b.flipcnt += 1
+}
+
+// fill reads into the buffer until at least _need_ bytes are in it
+func (b *buffer) fill(need int) error {
+	n := b.length
+	// fill data into its double-buffering target: if we've called
+	// flip on this buffer, we'll be copying to the background buffer,
+	// and then filling it with network data; otherwise we'll just move
+	// the contents of the current buffer to the front before filling it
+	dest := b.dbuf[b.flipcnt&1]
+
+	// grow buffer if necessary to fit the whole packet.
+	if need > len(dest) {
+		// Round up to the next multiple of the default size
+		dest = make([]byte, ((need/defaultBufSize)+1)*defaultBufSize)
+
+		// if the allocated buffer is not too large, move it to backing storage
+		// to prevent extra allocations on applications that perform large reads
+		if len(dest) <= maxCachedBufSize {
+			b.dbuf[b.flipcnt&1] = dest
+		}
+	}
+
+	// if we're filling the fg buffer, move the existing data to the start of it.
+	// if we're filling the bg buffer, copy over the data
+	if n > 0 {
+		copy(dest[:n], b.buf[b.idx:])
+	}
+
+	b.buf = dest
+	b.idx = 0
+
+	for {
+		if b.timeout > 0 {
+			if err := b.nc.SetReadDeadline(time.Now().Add(b.timeout)); err != nil {
+				return err
+			}
+		}
+
+		nn, err := b.nc.Read(b.buf[n:])
+		n += nn
+
+		switch err {
+		case nil:
+			if n < need {
+				continue
+			}
+			b.length = n
+			return nil
+
+		case io.EOF:
+			if n >= need {
+				b.length = n
+				return nil
+			}
+			return io.ErrUnexpectedEOF
+
+		default:
+			return err
+		}
+	}
+}
+
+// returns next N bytes from buffer.
+// The returned slice is only guaranteed to be valid until the next read
+func (b *buffer) readNext(need int) ([]byte, error) {
+	if b.length < need {
+		// refill
+		if err := b.fill(need); err != nil {
+			return nil, err
+		}
+	}
+
+	offset := b.idx
+	b.idx += need
+	b.length -= need
+	return b.buf[offset:b.idx], nil
+}
+
+// takeBuffer returns a buffer with the requested size.
+// If possible, a slice from the existing buffer is returned.
+// Otherwise a bigger buffer is made.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeBuffer(length int) ([]byte, error) {
+	if b.length > 0 {
+		return nil, ErrBusyBuffer
+	}
+
+	// test (cheap) general case first
+	if length <= cap(b.buf) {
+		return b.buf[:length], nil
+	}
+
+	if length < maxPacketSize {
+		b.buf = make([]byte, length)
+		return b.buf, nil
+	}
+
+	// buffer is larger than we want to store.
+	return make([]byte, length), nil
+}
+
+// takeSmallBuffer is shortcut which can be used if length is
+// known to be smaller than defaultBufSize.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeSmallBuffer(length int) ([]byte, error) {
+	if b.length > 0 {
+		return nil, ErrBusyBuffer
+	}
+	return b.buf[:length], nil
+}
+
+// takeCompleteBuffer returns the complete existing buffer.
+// This can be used if the necessary buffer size is unknown.
+// cap and len of the returned buffer will be equal.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeCompleteBuffer() ([]byte, error) {
+	if b.length > 0 {
+		return nil, ErrBusyBuffer
+	}
+	return b.buf, nil
+}
+
+// store stores buf, an updated buffer, if its suitable to do so.
+func (b *buffer) store(buf []byte) error {
+	if b.length > 0 {
+		return ErrBusyBuffer
+	} else if cap(buf) <= maxPacketSize && cap(buf) > cap(b.buf) {
+		b.buf = buf[:cap(buf)]
+	}
+	return nil
+}

vendor/github.com/go-sql-driver/mysql/collations.go

@@ -0,0 +1,265 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2014 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+const defaultCollation = "utf8mb4_general_ci"
+const binaryCollation = "binary"
+
+// A list of available collations mapped to the internal ID.
+// To update this map use the following MySQL query:
+//     SELECT COLLATION_NAME, ID FROM information_schema.COLLATIONS WHERE ID<256 ORDER BY ID
+//
+// Handshake packet have only 1 byte for collation_id.  So we can't use collations with ID > 255.
+//
+// ucs2, utf16, and utf32 can't be used for connection charset.
+// https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html#charset-connection-impermissible-client-charset
+// They are commented out to reduce this map.
+var collations = map[string]byte{
+	"big5_chinese_ci":      1,
+	"latin2_czech_cs":      2,
+	"dec8_swedish_ci":      3,
+	"cp850_general_ci":     4,
+	"latin1_german1_ci":    5,
+	"hp8_english_ci":       6,
+	"koi8r_general_ci":     7,
+	"latin1_swedish_ci":    8,
+	"latin2_general_ci":    9,
+	"swe7_swedish_ci":      10,
+	"ascii_general_ci":     11,
+	"ujis_japanese_ci":     12,
+	"sjis_japanese_ci":     13,
+	"cp1251_bulgarian_ci":  14,
+	"latin1_danish_ci":     15,
+	"hebrew_general_ci":    16,
+	"tis620_thai_ci":       18,
+	"euckr_korean_ci":      19,
+	"latin7_estonian_cs":   20,
+	"latin2_hungarian_ci":  21,
+	"koi8u_general_ci":     22,
+	"cp1251_ukrainian_ci":  23,
+	"gb2312_chinese_ci":    24,
+	"greek_general_ci":     25,
+	"cp1250_general_ci":    26,
+	"latin2_croatian_ci":   27,
+	"gbk_chinese_ci":       28,
+	"cp1257_lithuanian_ci": 29,
+	"latin5_turkish_ci":    30,
+	"latin1_german2_ci":    31,
+	"armscii8_general_ci":  32,
+	"utf8_general_ci":      33,
+	"cp1250_czech_cs":      34,
+	//"ucs2_general_ci":          35,
+	"cp866_general_ci":    36,
+	"keybcs2_general_ci":  37,
+	"macce_general_ci":    38,
+	"macroman_general_ci": 39,
+	"cp852_general_ci":    40,
+	"latin7_general_ci":   41,
+	"latin7_general_cs":   42,
+	"macce_bin":           43,
+	"cp1250_croatian_ci":  44,
+	"utf8mb4_general_ci":  45,
+	"utf8mb4_bin":         46,
+	"latin1_bin":          47,
+	"latin1_general_ci":   48,
+	"latin1_general_cs":   49,
+	"cp1251_bin":          50,
+	"cp1251_general_ci":   51,
+	"cp1251_general_cs":   52,
+	"macroman_bin":        53,
+	//"utf16_general_ci":         54,
+	//"utf16_bin":                55,
+	//"utf16le_general_ci":       56,
+	"cp1256_general_ci": 57,
+	"cp1257_bin":        58,
+	"cp1257_general_ci": 59,
+	//"utf32_general_ci":         60,
+	//"utf32_bin":                61,
+	//"utf16le_bin":              62,
+	"binary":          63,
+	"armscii8_bin":    64,
+	"ascii_bin":       65,
+	"cp1250_bin":      66,
+	"cp1256_bin":      67,
+	"cp866_bin":       68,
+	"dec8_bin":        69,
+	"greek_bin":       70,
+	"hebrew_bin":      71,
+	"hp8_bin":         72,
+	"keybcs2_bin":     73,
+	"koi8r_bin":       74,
+	"koi8u_bin":       75,
+	"utf8_tolower_ci": 76,
+	"latin2_bin":      77,
+	"latin5_bin":      78,
+	"latin7_bin":      79,
+	"cp850_bin":       80,
+	"cp852_bin":       81,
+	"swe7_bin":        82,
+	"utf8_bin":        83,
+	"big5_bin":        84,
+	"euckr_bin":       85,
+	"gb2312_bin":      86,
+	"gbk_bin":         87,
+	"sjis_bin":        88,
+	"tis620_bin":      89,
+	//"ucs2_bin":                 90,
+	"ujis_bin":            91,
+	"geostd8_general_ci":  92,
+	"geostd8_bin":         93,
+	"latin1_spanish_ci":   94,
+	"cp932_japanese_ci":   95,
+	"cp932_bin":           96,
+	"eucjpms_japanese_ci": 97,
+	"eucjpms_bin":         98,
+	"cp1250_polish_ci":    99,
+	//"utf16_unicode_ci":         101,
+	//"utf16_icelandic_ci":       102,
+	//"utf16_latvian_ci":         103,
+	//"utf16_romanian_ci":        104,
+	//"utf16_slovenian_ci":       105,
+	//"utf16_polish_ci":          106,
+	//"utf16_estonian_ci":        107,
+	//"utf16_spanish_ci":         108,
+	//"utf16_swedish_ci":         109,
+	//"utf16_turkish_ci":         110,
+	//"utf16_czech_ci":           111,
+	//"utf16_danish_ci":          112,
+	//"utf16_lithuanian_ci":      113,
+	//"utf16_slovak_ci":          114,
+	//"utf16_spanish2_ci":        115,
+	//"utf16_roman_ci":           116,
+	//"utf16_persian_ci":         117,
+	//"utf16_esperanto_ci":       118,
+	//"utf16_hungarian_ci":       119,
+	//"utf16_sinhala_ci":         120,
+	//"utf16_german2_ci":         121,
+	//"utf16_croatian_ci":        122,
+	//"utf16_unicode_520_ci":     123,
+	//"utf16_vietnamese_ci":      124,
+	//"ucs2_unicode_ci":          128,
+	//"ucs2_icelandic_ci":        129,
+	//"ucs2_latvian_ci":          130,
+	//"ucs2_romanian_ci":         131,
+	//"ucs2_slovenian_ci":        132,
+	//"ucs2_polish_ci":           133,
+	//"ucs2_estonian_ci":         134,
+	//"ucs2_spanish_ci":          135,
+	//"ucs2_swedish_ci":          136,
+	//"ucs2_turkish_ci":          137,
+	//"ucs2_czech_ci":            138,
+	//"ucs2_danish_ci":           139,
+	//"ucs2_lithuanian_ci":       140,
+	//"ucs2_slovak_ci":           141,
+	//"ucs2_spanish2_ci":         142,
+	//"ucs2_roman_ci":            143,
+	//"ucs2_persian_ci":          144,
+	//"ucs2_esperanto_ci":        145,
+	//"ucs2_hungarian_ci":        146,
+	//"ucs2_sinhala_ci":          147,
+	//"ucs2_german2_ci":          148,
+	//"ucs2_croatian_ci":         149,
+	//"ucs2_unicode_520_ci":      150,
+	//"ucs2_vietnamese_ci":       151,
+	//"ucs2_general_mysql500_ci": 159,
+	//"utf32_unicode_ci":         160,
+	//"utf32_icelandic_ci":       161,
+	//"utf32_latvian_ci":         162,
+	//"utf32_romanian_ci":        163,
+	//"utf32_slovenian_ci":       164,
+	//"utf32_polish_ci":          165,
+	//"utf32_estonian_ci":        166,
+	//"utf32_spanish_ci":         167,
+	//"utf32_swedish_ci":         168,
+	//"utf32_turkish_ci":         169,
+	//"utf32_czech_ci":           170,
+	//"utf32_danish_ci":          171,
+	//"utf32_lithuanian_ci":      172,
+	//"utf32_slovak_ci":          173,
+	//"utf32_spanish2_ci":        174,
+	//"utf32_roman_ci":           175,
+	//"utf32_persian_ci":         176,
+	//"utf32_esperanto_ci":       177,
+	//"utf32_hungarian_ci":       178,
+	//"utf32_sinhala_ci":         179,
+	//"utf32_german2_ci":         180,
+	//"utf32_croatian_ci":        181,
+	//"utf32_unicode_520_ci":     182,
+	//"utf32_vietnamese_ci":      183,
+	"utf8_unicode_ci":          192,
+	"utf8_icelandic_ci":        193,
+	"utf8_latvian_ci":          194,
+	"utf8_romanian_ci":         195,
+	"utf8_slovenian_ci":        196,
+	"utf8_polish_ci":           197,
+	"utf8_estonian_ci":         198,
+	"utf8_spanish_ci":          199,
+	"utf8_swedish_ci":          200,
+	"utf8_turkish_ci":          201,
+	"utf8_czech_ci":            202,
+	"utf8_danish_ci":           203,
+	"utf8_lithuanian_ci":       204,
+	"utf8_slovak_ci":           205,
+	"utf8_spanish2_ci":         206,
+	"utf8_roman_ci":            207,
+	"utf8_persian_ci":          208,
+	"utf8_esperanto_ci":        209,
+	"utf8_hungarian_ci":        210,
+	"utf8_sinhala_ci":          211,
+	"utf8_german2_ci":          212,
+	"utf8_croatian_ci":         213,
+	"utf8_unicode_520_ci":      214,
+	"utf8_vietnamese_ci":       215,
+	"utf8_general_mysql500_ci": 223,
+	"utf8mb4_unicode_ci":       224,
+	"utf8mb4_icelandic_ci":     225,
+	"utf8mb4_latvian_ci":       226,
+	"utf8mb4_romanian_ci":      227,
+	"utf8mb4_slovenian_ci":     228,
+	"utf8mb4_polish_ci":        229,
+	"utf8mb4_estonian_ci":      230,
+	"utf8mb4_spanish_ci":       231,
+	"utf8mb4_swedish_ci":       232,
+	"utf8mb4_turkish_ci":       233,
+	"utf8mb4_czech_ci":         234,
+	"utf8mb4_danish_ci":        235,
+	"utf8mb4_lithuanian_ci":    236,
+	"utf8mb4_slovak_ci":        237,
+	"utf8mb4_spanish2_ci":      238,
+	"utf8mb4_roman_ci":         239,
+	"utf8mb4_persian_ci":       240,
+	"utf8mb4_esperanto_ci":     241,
+	"utf8mb4_hungarian_ci":     242,
+	"utf8mb4_sinhala_ci":       243,
+	"utf8mb4_german2_ci":       244,
+	"utf8mb4_croatian_ci":      245,
+	"utf8mb4_unicode_520_ci":   246,
+	"utf8mb4_vietnamese_ci":    247,
+	"gb18030_chinese_ci":       248,
+	"gb18030_bin":              249,
+	"gb18030_unicode_520_ci":   250,
+	"utf8mb4_0900_ai_ci":       255,
+}
+
+// A blacklist of collations which is unsafe to interpolate parameters.
+// These multibyte encodings may contains 0x5c (`\`) in their trailing bytes.
+var unsafeCollations = map[string]bool{
+	"big5_chinese_ci":        true,
+	"sjis_japanese_ci":       true,
+	"gbk_chinese_ci":         true,
+	"big5_bin":               true,
+	"gb2312_bin":             true,
+	"gbk_bin":                true,
+	"sjis_bin":               true,
+	"cp932_japanese_ci":      true,
+	"cp932_bin":              true,
+	"gb18030_chinese_ci":     true,
+	"gb18030_bin":            true,
+	"gb18030_unicode_520_ci": true,
+}

vendor/github.com/go-sql-driver/mysql/conncheck.go

@@ -0,0 +1,54 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos
+
+package mysql
+
+import (
+	"errors"
+	"io"
+	"net"
+	"syscall"
+)
+
+var errUnexpectedRead = errors.New("unexpected read from socket")
+
+func connCheck(conn net.Conn) error {
+	var sysErr error
+
+	sysConn, ok := conn.(syscall.Conn)
+	if !ok {
+		return nil
+	}
+	rawConn, err := sysConn.SyscallConn()
+	if err != nil {
+		return err
+	}
+
+	err = rawConn.Read(func(fd uintptr) bool {
+		var buf [1]byte
+		n, err := syscall.Read(int(fd), buf[:])
+		switch {
+		case n == 0 && err == nil:
+			sysErr = io.EOF
+		case n > 0:
+			sysErr = errUnexpectedRead
+		case err == syscall.EAGAIN || err == syscall.EWOULDBLOCK:
+			sysErr = nil
+		default:
+			sysErr = err
+		}
+		return true
+	})
+	if err != nil {
+		return err
+	}
+
+	return sysErr
+}

vendor/github.com/go-sql-driver/mysql/conncheck_dummy.go

@@ -0,0 +1,17 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build !linux,!darwin,!dragonfly,!freebsd,!netbsd,!openbsd,!solaris,!illumos
+
+package mysql
+
+import "net"
+
+func connCheck(conn net.Conn) error {
+	return nil
+}

vendor/github.com/go-sql-driver/mysql/connection.go

@@ -0,0 +1,651 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"io"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type mysqlConn struct {
+	buf              buffer
+	netConn          net.Conn
+	rawConn          net.Conn // underlying connection when netConn is TLS connection.
+	affectedRows     uint64
+	insertId         uint64
+	cfg              *Config
+	maxAllowedPacket int
+	maxWriteSize     int
+	writeTimeout     time.Duration
+	flags            clientFlag
+	status           statusFlag
+	sequence         uint8
+	parseTime        bool
+	reset            bool // set when the Go SQL package calls ResetSession
+
+	// for context support (Go 1.8+)
+	watching bool
+	watcher  chan<- context.Context
+	closech  chan struct{}
+	finished chan<- struct{}
+	canceled atomicError // set non-nil if conn is canceled
+	closed   atomicBool  // set when conn is closed, before closech is closed
+}
+
+// Handles parameters set in DSN after the connection is established
+func (mc *mysqlConn) handleParams() (err error) {
+	for param, val := range mc.cfg.Params {
+		switch param {
+		// Charset
+		case "charset":
+			charsets := strings.Split(val, ",")
+			for i := range charsets {
+				// ignore errors here - a charset may not exist
+				err = mc.exec("SET NAMES " + charsets[i])
+				if err == nil {
+					break
+				}
+			}
+			if err != nil {
+				return
+			}
+
+		// System Vars
+		default:
+			err = mc.exec("SET " + param + "=" + val + "")
+			if err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}
+
+func (mc *mysqlConn) markBadConn(err error) error {
+	if mc == nil {
+		return err
+	}
+	if err != errBadConnNoWrite {
+		return err
+	}
+	return driver.ErrBadConn
+}
+
+func (mc *mysqlConn) Begin() (driver.Tx, error) {
+	return mc.begin(false)
+}
+
+func (mc *mysqlConn) begin(readOnly bool) (driver.Tx, error) {
+	if mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	var q string
+	if readOnly {
+		q = "START TRANSACTION READ ONLY"
+	} else {
+		q = "START TRANSACTION"
+	}
+	err := mc.exec(q)
+	if err == nil {
+		return &mysqlTx{mc}, err
+	}
+	return nil, mc.markBadConn(err)
+}
+
+func (mc *mysqlConn) Close() (err error) {
+	// Makes Close idempotent
+	if !mc.closed.IsSet() {
+		err = mc.writeCommandPacket(comQuit)
+	}
+
+	mc.cleanup()
+
+	return
+}
+
+// Closes the network connection and unsets internal variables. Do not call this
+// function after successfully authentication, call Close instead. This function
+// is called before auth or on auth failure because MySQL will have already
+// closed the network connection.
+func (mc *mysqlConn) cleanup() {
+	if !mc.closed.TrySet(true) {
+		return
+	}
+
+	// Makes cleanup idempotent
+	close(mc.closech)
+	if mc.netConn == nil {
+		return
+	}
+	if err := mc.netConn.Close(); err != nil {
+		errLog.Print(err)
+	}
+}
+
+func (mc *mysqlConn) error() error {
+	if mc.closed.IsSet() {
+		if err := mc.canceled.Value(); err != nil {
+			return err
+		}
+		return ErrInvalidConn
+	}
+	return nil
+}
+
+func (mc *mysqlConn) Prepare(query string) (driver.Stmt, error) {
+	if mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	// Send command
+	err := mc.writeCommandPacketStr(comStmtPrepare, query)
+	if err != nil {
+		// STMT_PREPARE is safe to retry.  So we can return ErrBadConn here.
+		errLog.Print(err)
+		return nil, driver.ErrBadConn
+	}
+
+	stmt := &mysqlStmt{
+		mc: mc,
+	}
+
+	// Read Result
+	columnCount, err := stmt.readPrepareResultPacket()
+	if err == nil {
+		if stmt.paramCount > 0 {
+			if err = mc.readUntilEOF(); err != nil {
+				return nil, err
+			}
+		}
+
+		if columnCount > 0 {
+			err = mc.readUntilEOF()
+		}
+	}
+
+	return stmt, err
+}
+
+func (mc *mysqlConn) interpolateParams(query string, args []driver.Value) (string, error) {
+	// Number of ? should be same to len(args)
+	if strings.Count(query, "?") != len(args) {
+		return "", driver.ErrSkip
+	}
+
+	buf, err := mc.buf.takeCompleteBuffer()
+	if err != nil {
+		// can not take the buffer. Something must be wrong with the connection
+		errLog.Print(err)
+		return "", ErrInvalidConn
+	}
+	buf = buf[:0]
+	argPos := 0
+
+	for i := 0; i < len(query); i++ {
+		q := strings.IndexByte(query[i:], '?')
+		if q == -1 {
+			buf = append(buf, query[i:]...)
+			break
+		}
+		buf = append(buf, query[i:i+q]...)
+		i += q
+
+		arg := args[argPos]
+		argPos++
+
+		if arg == nil {
+			buf = append(buf, "NULL"...)
+			continue
+		}
+
+		switch v := arg.(type) {
+		case int64:
+			buf = strconv.AppendInt(buf, v, 10)
+		case uint64:
+			// Handle uint64 explicitly because our custom ConvertValue emits unsigned values
+			buf = strconv.AppendUint(buf, v, 10)
+		case float64:
+			buf = strconv.AppendFloat(buf, v, 'g', -1, 64)
+		case bool:
+			if v {
+				buf = append(buf, '1')
+			} else {
+				buf = append(buf, '0')
+			}
+		case time.Time:
+			if v.IsZero() {
+				buf = append(buf, "'0000-00-00'"...)
+			} else {
+				v := v.In(mc.cfg.Loc)
+				v = v.Add(time.Nanosecond * 500) // To round under microsecond
+				year := v.Year()
+				year100 := year / 100
+				year1 := year % 100
+				month := v.Month()
+				day := v.Day()
+				hour := v.Hour()
+				minute := v.Minute()
+				second := v.Second()
+				micro := v.Nanosecond() / 1000
+
+				buf = append(buf, []byte{
+					'\'',
+					digits10[year100], digits01[year100],
+					digits10[year1], digits01[year1],
+					'-',
+					digits10[month], digits01[month],
+					'-',
+					digits10[day], digits01[day],
+					' ',
+					digits10[hour], digits01[hour],
+					':',
+					digits10[minute], digits01[minute],
+					':',
+					digits10[second], digits01[second],
+				}...)
+
+				if micro != 0 {
+					micro10000 := micro / 10000
+					micro100 := micro / 100 % 100
+					micro1 := micro % 100
+					buf = append(buf, []byte{
+						'.',
+						digits10[micro10000], digits01[micro10000],
+						digits10[micro100], digits01[micro100],
+						digits10[micro1], digits01[micro1],
+					}...)
+				}
+				buf = append(buf, '\'')
+			}
+		case []byte:
+			if v == nil {
+				buf = append(buf, "NULL"...)
+			} else {
+				buf = append(buf, "_binary'"...)
+				if mc.status&statusNoBackslashEscapes == 0 {
+					buf = escapeBytesBackslash(buf, v)
+				} else {
+					buf = escapeBytesQuotes(buf, v)
+				}
+				buf = append(buf, '\'')
+			}
+		case string:
+			buf = append(buf, '\'')
+			if mc.status&statusNoBackslashEscapes == 0 {
+				buf = escapeStringBackslash(buf, v)
+			} else {
+				buf = escapeStringQuotes(buf, v)
+			}
+			buf = append(buf, '\'')
+		default:
+			return "", driver.ErrSkip
+		}
+
+		if len(buf)+4 > mc.maxAllowedPacket {
+			return "", driver.ErrSkip
+		}
+	}
+	if argPos != len(args) {
+		return "", driver.ErrSkip
+	}
+	return string(buf), nil
+}
+
+func (mc *mysqlConn) Exec(query string, args []driver.Value) (driver.Result, error) {
+	if mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	if len(args) != 0 {
+		if !mc.cfg.InterpolateParams {
+			return nil, driver.ErrSkip
+		}
+		// try to interpolate the parameters to save extra roundtrips for preparing and closing a statement
+		prepared, err := mc.interpolateParams(query, args)
+		if err != nil {
+			return nil, err
+		}
+		query = prepared
+	}
+	mc.affectedRows = 0
+	mc.insertId = 0
+
+	err := mc.exec(query)
+	if err == nil {
+		return &mysqlResult{
+			affectedRows: int64(mc.affectedRows),
+			insertId:     int64(mc.insertId),
+		}, err
+	}
+	return nil, mc.markBadConn(err)
+}
+
+// Internal function to execute commands
+func (mc *mysqlConn) exec(query string) error {
+	// Send command
+	if err := mc.writeCommandPacketStr(comQuery, query); err != nil {
+		return mc.markBadConn(err)
+	}
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err != nil {
+		return err
+	}
+
+	if resLen > 0 {
+		// columns
+		if err := mc.readUntilEOF(); err != nil {
+			return err
+		}
+
+		// rows
+		if err := mc.readUntilEOF(); err != nil {
+			return err
+		}
+	}
+
+	return mc.discardResults()
+}
+
+func (mc *mysqlConn) Query(query string, args []driver.Value) (driver.Rows, error) {
+	return mc.query(query, args)
+}
+
+func (mc *mysqlConn) query(query string, args []driver.Value) (*textRows, error) {
+	if mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	if len(args) != 0 {
+		if !mc.cfg.InterpolateParams {
+			return nil, driver.ErrSkip
+		}
+		// try client-side prepare to reduce roundtrip
+		prepared, err := mc.interpolateParams(query, args)
+		if err != nil {
+			return nil, err
+		}
+		query = prepared
+	}
+	// Send command
+	err := mc.writeCommandPacketStr(comQuery, query)
+	if err == nil {
+		// Read Result
+		var resLen int
+		resLen, err = mc.readResultSetHeaderPacket()
+		if err == nil {
+			rows := new(textRows)
+			rows.mc = mc
+
+			if resLen == 0 {
+				rows.rs.done = true
+
+				switch err := rows.NextResultSet(); err {
+				case nil, io.EOF:
+					return rows, nil
+				default:
+					return nil, err
+				}
+			}
+
+			// Columns
+			rows.rs.columns, err = mc.readColumns(resLen)
+			return rows, err
+		}
+	}
+	return nil, mc.markBadConn(err)
+}
+
+// Gets the value of the given MySQL System Variable
+// The returned byte slice is only valid until the next read
+func (mc *mysqlConn) getSystemVar(name string) ([]byte, error) {
+	// Send command
+	if err := mc.writeCommandPacketStr(comQuery, "SELECT @@"+name); err != nil {
+		return nil, err
+	}
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err == nil {
+		rows := new(textRows)
+		rows.mc = mc
+		rows.rs.columns = []mysqlField{{fieldType: fieldTypeVarChar}}
+
+		if resLen > 0 {
+			// Columns
+			if err := mc.readUntilEOF(); err != nil {
+				return nil, err
+			}
+		}
+
+		dest := make([]driver.Value, resLen)
+		if err = rows.readRow(dest); err == nil {
+			return dest[0].([]byte), mc.readUntilEOF()
+		}
+	}
+	return nil, err
+}
+
+// finish is called when the query has canceled.
+func (mc *mysqlConn) cancel(err error) {
+	mc.canceled.Set(err)
+	mc.cleanup()
+}
+
+// finish is called when the query has succeeded.
+func (mc *mysqlConn) finish() {
+	if !mc.watching || mc.finished == nil {
+		return
+	}
+	select {
+	case mc.finished <- struct{}{}:
+		mc.watching = false
+	case <-mc.closech:
+	}
+}
+
+// Ping implements driver.Pinger interface
+func (mc *mysqlConn) Ping(ctx context.Context) (err error) {
+	if mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return driver.ErrBadConn
+	}
+
+	if err = mc.watchCancel(ctx); err != nil {
+		return
+	}
+	defer mc.finish()
+
+	if err = mc.writeCommandPacket(comPing); err != nil {
+		return mc.markBadConn(err)
+	}
+
+	return mc.readResultOK()
+}
+
+// BeginTx implements driver.ConnBeginTx interface
+func (mc *mysqlConn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer mc.finish()
+
+	if sql.IsolationLevel(opts.Isolation) != sql.LevelDefault {
+		level, err := mapIsolationLevel(opts.Isolation)
+		if err != nil {
+			return nil, err
+		}
+		err = mc.exec("SET TRANSACTION ISOLATION LEVEL " + level)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return mc.begin(opts.ReadOnly)
+}
+
+func (mc *mysqlConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	rows, err := mc.query(query, dargs)
+	if err != nil {
+		mc.finish()
+		return nil, err
+	}
+	rows.finish = mc.finish
+	return rows, err
+}
+
+func (mc *mysqlConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer mc.finish()
+
+	return mc.Exec(query, dargs)
+}
+
+func (mc *mysqlConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	stmt, err := mc.Prepare(query)
+	mc.finish()
+	if err != nil {
+		return nil, err
+	}
+
+	select {
+	default:
+	case <-ctx.Done():
+		stmt.Close()
+		return nil, ctx.Err()
+	}
+	return stmt, nil
+}
+
+func (stmt *mysqlStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := stmt.mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	rows, err := stmt.query(dargs)
+	if err != nil {
+		stmt.mc.finish()
+		return nil, err
+	}
+	rows.finish = stmt.mc.finish
+	return rows, err
+}
+
+func (stmt *mysqlStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := stmt.mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer stmt.mc.finish()
+
+	return stmt.Exec(dargs)
+}
+
+func (mc *mysqlConn) watchCancel(ctx context.Context) error {
+	if mc.watching {
+		// Reach here if canceled,
+		// so the connection is already invalid
+		mc.cleanup()
+		return nil
+	}
+	// When ctx is already cancelled, don't watch it.
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	// When ctx is not cancellable, don't watch it.
+	if ctx.Done() == nil {
+		return nil
+	}
+	// When watcher is not alive, can't watch it.
+	if mc.watcher == nil {
+		return nil
+	}
+
+	mc.watching = true
+	mc.watcher <- ctx
+	return nil
+}
+
+func (mc *mysqlConn) startWatcher() {
+	watcher := make(chan context.Context, 1)
+	mc.watcher = watcher
+	finished := make(chan struct{})
+	mc.finished = finished
+	go func() {
+		for {
+			var ctx context.Context
+			select {
+			case ctx = <-watcher:
+			case <-mc.closech:
+				return
+			}
+
+			select {
+			case <-ctx.Done():
+				mc.cancel(ctx.Err())
+			case <-finished:
+			case <-mc.closech:
+				return
+			}
+		}
+	}()
+}
+
+func (mc *mysqlConn) CheckNamedValue(nv *driver.NamedValue) (err error) {
+	nv.Value, err = converter{}.ConvertValue(nv.Value)
+	return
+}
+
+// ResetSession implements driver.SessionResetter.
+// (From Go 1.10)
+func (mc *mysqlConn) ResetSession(ctx context.Context) error {
+	if mc.closed.IsSet() {
+		return driver.ErrBadConn
+	}
+	mc.reset = true
+	return nil
+}

vendor/github.com/go-sql-driver/mysql/connector.go

@@ -0,0 +1,146 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2018 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"context"
+	"database/sql/driver"
+	"net"
+)
+
+type connector struct {
+	cfg *Config // immutable private copy.
+}
+
+// Connect implements driver.Connector interface.
+// Connect returns a connection to the database.
+func (c *connector) Connect(ctx context.Context) (driver.Conn, error) {
+	var err error
+
+	// New mysqlConn
+	mc := &mysqlConn{
+		maxAllowedPacket: maxPacketSize,
+		maxWriteSize:     maxPacketSize - 1,
+		closech:          make(chan struct{}),
+		cfg:              c.cfg,
+	}
+	mc.parseTime = mc.cfg.ParseTime
+
+	// Connect to Server
+	dialsLock.RLock()
+	dial, ok := dials[mc.cfg.Net]
+	dialsLock.RUnlock()
+	if ok {
+		dctx := ctx
+		if mc.cfg.Timeout > 0 {
+			var cancel context.CancelFunc
+			dctx, cancel = context.WithTimeout(ctx, c.cfg.Timeout)
+			defer cancel()
+		}
+		mc.netConn, err = dial(dctx, mc.cfg.Addr)
+	} else {
+		nd := net.Dialer{Timeout: mc.cfg.Timeout}
+		mc.netConn, err = nd.DialContext(ctx, mc.cfg.Net, mc.cfg.Addr)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Enable TCP Keepalives on TCP connections
+	if tc, ok := mc.netConn.(*net.TCPConn); ok {
+		if err := tc.SetKeepAlive(true); err != nil {
+			// Don't send COM_QUIT before handshake.
+			mc.netConn.Close()
+			mc.netConn = nil
+			return nil, err
+		}
+	}
+
+	// Call startWatcher for context support (From Go 1.8)
+	mc.startWatcher()
+	if err := mc.watchCancel(ctx); err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+	defer mc.finish()
+
+	mc.buf = newBuffer(mc.netConn)
+
+	// Set I/O timeouts
+	mc.buf.timeout = mc.cfg.ReadTimeout
+	mc.writeTimeout = mc.cfg.WriteTimeout
+
+	// Reading Handshake Initialization Packet
+	authData, plugin, err := mc.readHandshakePacket()
+	if err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+
+	if plugin == "" {
+		plugin = defaultAuthPlugin
+	}
+
+	// Send Client Authentication Packet
+	authResp, err := mc.auth(authData, plugin)
+	if err != nil {
+		// try the default auth plugin, if using the requested plugin failed
+		errLog.Print("could not use requested auth plugin '"+plugin+"': ", err.Error())
+		plugin = defaultAuthPlugin
+		authResp, err = mc.auth(authData, plugin)
+		if err != nil {
+			mc.cleanup()
+			return nil, err
+		}
+	}
+	if err = mc.writeHandshakeResponsePacket(authResp, plugin); err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+
+	// Handle response to auth packet, switch methods if possible
+	if err = mc.handleAuthResult(authData, plugin); err != nil {
+		// Authentication failed and MySQL has already closed the connection
+		// (https://dev.mysql.com/doc/internals/en/authentication-fails.html).
+		// Do not send COM_QUIT, just cleanup and return the error.
+		mc.cleanup()
+		return nil, err
+	}
+
+	if mc.cfg.MaxAllowedPacket > 0 {
+		mc.maxAllowedPacket = mc.cfg.MaxAllowedPacket
+	} else {
+		// Get max allowed packet size
+		maxap, err := mc.getSystemVar("max_allowed_packet")
+		if err != nil {
+			mc.Close()
+			return nil, err
+		}
+		mc.maxAllowedPacket = stringToInt(maxap) - 1
+	}
+	if mc.maxAllowedPacket < maxPacketSize {
+		mc.maxWriteSize = mc.maxAllowedPacket
+	}
+
+	// Handle DSN Params
+	err = mc.handleParams()
+	if err != nil {
+		mc.Close()
+		return nil, err
+	}
+
+	return mc, nil
+}
+
+// Driver implements driver.Connector interface.
+// Driver returns &MySQLDriver{}.
+func (c *connector) Driver() driver.Driver {
+	return &MySQLDriver{}
+}

vendor/github.com/go-sql-driver/mysql/const.go

@@ -0,0 +1,174 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+const (
+	defaultAuthPlugin       = "mysql_native_password"
+	defaultMaxAllowedPacket = 4 << 20 // 4 MiB
+	minProtocolVersion      = 10
+	maxPacketSize           = 1<<24 - 1
+	timeFormat              = "2006-01-02 15:04:05.999999"
+)
+
+// MySQL constants documentation:
+// http://dev.mysql.com/doc/internals/en/client-server-protocol.html
+
+const (
+	iOK           byte = 0x00
+	iAuthMoreData byte = 0x01
+	iLocalInFile  byte = 0xfb
+	iEOF          byte = 0xfe
+	iERR          byte = 0xff
+)
+
+// https://dev.mysql.com/doc/internals/en/capability-flags.html#packet-Protocol::CapabilityFlags
+type clientFlag uint32
+
+const (
+	clientLongPassword clientFlag = 1 << iota
+	clientFoundRows
+	clientLongFlag
+	clientConnectWithDB
+	clientNoSchema
+	clientCompress
+	clientODBC
+	clientLocalFiles
+	clientIgnoreSpace
+	clientProtocol41
+	clientInteractive
+	clientSSL
+	clientIgnoreSIGPIPE
+	clientTransactions
+	clientReserved
+	clientSecureConn
+	clientMultiStatements
+	clientMultiResults
+	clientPSMultiResults
+	clientPluginAuth
+	clientConnectAttrs
+	clientPluginAuthLenEncClientData
+	clientCanHandleExpiredPasswords
+	clientSessionTrack
+	clientDeprecateEOF
+)
+
+const (
+	comQuit byte = iota + 1
+	comInitDB
+	comQuery
+	comFieldList
+	comCreateDB
+	comDropDB
+	comRefresh
+	comShutdown
+	comStatistics
+	comProcessInfo
+	comConnect
+	comProcessKill
+	comDebug
+	comPing
+	comTime
+	comDelayedInsert
+	comChangeUser
+	comBinlogDump
+	comTableDump
+	comConnectOut
+	comRegisterSlave
+	comStmtPrepare
+	comStmtExecute
+	comStmtSendLongData
+	comStmtClose
+	comStmtReset
+	comSetOption
+	comStmtFetch
+)
+
+// https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnType
+type fieldType byte
+
+const (
+	fieldTypeDecimal fieldType = iota
+	fieldTypeTiny
+	fieldTypeShort
+	fieldTypeLong
+	fieldTypeFloat
+	fieldTypeDouble
+	fieldTypeNULL
+	fieldTypeTimestamp
+	fieldTypeLongLong
+	fieldTypeInt24
+	fieldTypeDate
+	fieldTypeTime
+	fieldTypeDateTime
+	fieldTypeYear
+	fieldTypeNewDate
+	fieldTypeVarChar
+	fieldTypeBit
+)
+const (
+	fieldTypeJSON fieldType = iota + 0xf5
+	fieldTypeNewDecimal
+	fieldTypeEnum
+	fieldTypeSet
+	fieldTypeTinyBLOB
+	fieldTypeMediumBLOB
+	fieldTypeLongBLOB
+	fieldTypeBLOB
+	fieldTypeVarString
+	fieldTypeString
+	fieldTypeGeometry
+)
+
+type fieldFlag uint16
+
+const (
+	flagNotNULL fieldFlag = 1 << iota
+	flagPriKey
+	flagUniqueKey
+	flagMultipleKey
+	flagBLOB
+	flagUnsigned
+	flagZeroFill
+	flagBinary
+	flagEnum
+	flagAutoIncrement
+	flagTimestamp
+	flagSet
+	flagUnknown1
+	flagUnknown2
+	flagUnknown3
+	flagUnknown4
+)
+
+// http://dev.mysql.com/doc/internals/en/status-flags.html
+type statusFlag uint16
+
+const (
+	statusInTrans statusFlag = 1 << iota
+	statusInAutocommit
+	statusReserved // Not in documentation
+	statusMoreResultsExists
+	statusNoGoodIndexUsed
+	statusNoIndexUsed
+	statusCursorExists
+	statusLastRowSent
+	statusDbDropped
+	statusNoBackslashEscapes
+	statusMetadataChanged
+	statusQueryWasSlow
+	statusPsOutParams
+	statusInTransReadonly
+	statusSessionStateChanged
+)
+
+const (
+	cachingSha2PasswordRequestPublicKey          = 2
+	cachingSha2PasswordFastAuthSuccess           = 3
+	cachingSha2PasswordPerformFullAuthentication = 4
+)

vendor/github.com/go-sql-driver/mysql/driver.go

@@ -0,0 +1,107 @@
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// Package mysql provides a MySQL driver for Go's database/sql package.
+//
+// The driver should be used via the database/sql package:
+//
+//  import "database/sql"
+//  import _ "github.com/go-sql-driver/mysql"
+//
+//  db, err := sql.Open("mysql", "user:password@/dbname")
+//
+// See https://github.com/go-sql-driver/mysql#usage for details
+package mysql
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"net"
+	"sync"
+)
+
+// MySQLDriver is exported to make the driver directly accessible.
+// In general the driver is used via the database/sql package.
+type MySQLDriver struct{}
+
+// DialFunc is a function which can be used to establish the network connection.
+// Custom dial functions must be registered with RegisterDial
+//
+// Deprecated: users should register a DialContextFunc instead
+type DialFunc func(addr string) (net.Conn, error)
+
+// DialContextFunc is a function which can be used to establish the network connection.
+// Custom dial functions must be registered with RegisterDialContext
+type DialContextFunc func(ctx context.Context, addr string) (net.Conn, error)
+
+var (
+	dialsLock sync.RWMutex
+	dials     map[string]DialContextFunc
+)
+
+// RegisterDialContext registers a custom dial function. It can then be used by the
+// network address mynet(addr), where mynet is the registered new network.
+// The current context for the connection and its address is passed to the dial function.
+func RegisterDialContext(net string, dial DialContextFunc) {
+	dialsLock.Lock()
+	defer dialsLock.Unlock()
+	if dials == nil {
+		dials = make(map[string]DialContextFunc)
+	}
+	dials[net] = dial
+}
+
+// RegisterDial registers a custom dial function. It can then be used by the
+// network address mynet(addr), where mynet is the registered new network.
+// addr is passed as a parameter to the dial function.
+//
+// Deprecated: users should call RegisterDialContext instead
+func RegisterDial(network string, dial DialFunc) {
+	RegisterDialContext(network, func(_ context.Context, addr string) (net.Conn, error) {
+		return dial(addr)
+	})
+}
+
+// Open new Connection.
+// See https://github.com/go-sql-driver/mysql#dsn-data-source-name for how
+// the DSN string is formatted
+func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
+	cfg, err := ParseDSN(dsn)
+	if err != nil {
+		return nil, err
+	}
+	c := &connector{
+		cfg: cfg,
+	}
+	return c.Connect(context.Background())
+}
+
+func init() {
+	sql.Register("mysql", &MySQLDriver{})
+}
+
+// NewConnector returns new driver.Connector.
+func NewConnector(cfg *Config) (driver.Connector, error) {
+	cfg = cfg.Clone()
+	// normalize the contents of cfg so calls to NewConnector have the same
+	// behavior as MySQLDriver.OpenConnector
+	if err := cfg.normalize(); err != nil {
+		return nil, err
+	}
+	return &connector{cfg: cfg}, nil
+}
+
+// OpenConnector implements driver.DriverContext.
+func (d MySQLDriver) OpenConnector(dsn string) (driver.Connector, error) {
+	cfg, err := ParseDSN(dsn)
+	if err != nil {
+		return nil, err
+	}
+	return &connector{
+		cfg: cfg,
+	}, nil
+}

vendor/github.com/go-sql-driver/mysql/dsn.go

@@ -0,0 +1,560 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2016 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"bytes"
+	"crypto/rsa"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"math/big"
+	"net"
+	"net/url"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	errInvalidDSNUnescaped       = errors.New("invalid DSN: did you forget to escape a param value?")
+	errInvalidDSNAddr            = errors.New("invalid DSN: network address not terminated (missing closing brace)")
+	errInvalidDSNNoSlash         = errors.New("invalid DSN: missing the slash separating the database name")
+	errInvalidDSNUnsafeCollation = errors.New("invalid DSN: interpolateParams can not be used with unsafe collations")
+)
+
+// Config is a configuration parsed from a DSN string.
+// If a new Config is created instead of being parsed from a DSN string,
+// the NewConfig function should be used, which sets default values.
+type Config struct {
+	User             string            // Username
+	Passwd           string            // Password (requires User)
+	Net              string            // Network type
+	Addr             string            // Network address (requires Net)
+	DBName           string            // Database name
+	Params           map[string]string // Connection parameters
+	Collation        string            // Connection collation
+	Loc              *time.Location    // Location for time.Time values
+	MaxAllowedPacket int               // Max packet size allowed
+	ServerPubKey     string            // Server public key name
+	pubKey           *rsa.PublicKey    // Server public key
+	TLSConfig        string            // TLS configuration name
+	tls              *tls.Config       // TLS configuration
+	Timeout          time.Duration     // Dial timeout
+	ReadTimeout      time.Duration     // I/O read timeout
+	WriteTimeout     time.Duration     // I/O write timeout
+
+	AllowAllFiles           bool // Allow all files to be used with LOAD DATA LOCAL INFILE
+	AllowCleartextPasswords bool // Allows the cleartext client side plugin
+	AllowNativePasswords    bool // Allows the native password authentication method
+	AllowOldPasswords       bool // Allows the old insecure password method
+	CheckConnLiveness       bool // Check connections for liveness before using them
+	ClientFoundRows         bool // Return number of matching rows instead of rows changed
+	ColumnsWithAlias        bool // Prepend table alias to column names
+	InterpolateParams       bool // Interpolate placeholders into query string
+	MultiStatements         bool // Allow multiple statements in one query
+	ParseTime               bool // Parse time values to time.Time
+	RejectReadOnly          bool // Reject read-only connections
+}
+
+// NewConfig creates a new Config and sets default values.
+func NewConfig() *Config {
+	return &Config{
+		Collation:            defaultCollation,
+		Loc:                  time.UTC,
+		MaxAllowedPacket:     defaultMaxAllowedPacket,
+		AllowNativePasswords: true,
+		CheckConnLiveness:    true,
+	}
+}
+
+func (cfg *Config) Clone() *Config {
+	cp := *cfg
+	if cp.tls != nil {
+		cp.tls = cfg.tls.Clone()
+	}
+	if len(cp.Params) > 0 {
+		cp.Params = make(map[string]string, len(cfg.Params))
+		for k, v := range cfg.Params {
+			cp.Params[k] = v
+		}
+	}
+	if cfg.pubKey != nil {
+		cp.pubKey = &rsa.PublicKey{
+			N: new(big.Int).Set(cfg.pubKey.N),
+			E: cfg.pubKey.E,
+		}
+	}
+	return &cp
+}
+
+func (cfg *Config) normalize() error {
+	if cfg.InterpolateParams && unsafeCollations[cfg.Collation] {
+		return errInvalidDSNUnsafeCollation
+	}
+
+	// Set default network if empty
+	if cfg.Net == "" {
+		cfg.Net = "tcp"
+	}
+
+	// Set default address if empty
+	if cfg.Addr == "" {
+		switch cfg.Net {
+		case "tcp":
+			cfg.Addr = "127.0.0.1:3306"
+		case "unix":
+			cfg.Addr = "/tmp/mysql.sock"
+		default:
+			return errors.New("default addr for network '" + cfg.Net + "' unknown")
+		}
+	} else if cfg.Net == "tcp" {
+		cfg.Addr = ensureHavePort(cfg.Addr)
+	}
+
+	switch cfg.TLSConfig {
+	case "false", "":
+		// don't set anything
+	case "true":
+		cfg.tls = &tls.Config{}
+	case "skip-verify", "preferred":
+		cfg.tls = &tls.Config{InsecureSkipVerify: true}
+	default:
+		cfg.tls = getTLSConfigClone(cfg.TLSConfig)
+		if cfg.tls == nil {
+			return errors.New("invalid value / unknown config name: " + cfg.TLSConfig)
+		}
+	}
+
+	if cfg.tls != nil && cfg.tls.ServerName == "" && !cfg.tls.InsecureSkipVerify {
+		host, _, err := net.SplitHostPort(cfg.Addr)
+		if err == nil {
+			cfg.tls.ServerName = host
+		}
+	}
+
+	if cfg.ServerPubKey != "" {
+		cfg.pubKey = getServerPubKey(cfg.ServerPubKey)
+		if cfg.pubKey == nil {
+			return errors.New("invalid value / unknown server pub key name: " + cfg.ServerPubKey)
+		}
+	}
+
+	return nil
+}
+
+func writeDSNParam(buf *bytes.Buffer, hasParam *bool, name, value string) {
+	buf.Grow(1 + len(name) + 1 + len(value))
+	if !*hasParam {
+		*hasParam = true
+		buf.WriteByte('?')
+	} else {
+		buf.WriteByte('&')
+	}
+	buf.WriteString(name)
+	buf.WriteByte('=')
+	buf.WriteString(value)
+}
+
+// FormatDSN formats the given Config into a DSN string which can be passed to
+// the driver.
+func (cfg *Config) FormatDSN() string {
+	var buf bytes.Buffer
+
+	// [username[:password]@]
+	if len(cfg.User) > 0 {
+		buf.WriteString(cfg.User)
+		if len(cfg.Passwd) > 0 {
+			buf.WriteByte(':')
+			buf.WriteString(cfg.Passwd)
+		}
+		buf.WriteByte('@')
+	}
+
+	// [protocol[(address)]]
+	if len(cfg.Net) > 0 {
+		buf.WriteString(cfg.Net)
+		if len(cfg.Addr) > 0 {
+			buf.WriteByte('(')
+			buf.WriteString(cfg.Addr)
+			buf.WriteByte(')')
+		}
+	}
+
+	// /dbname
+	buf.WriteByte('/')
+	buf.WriteString(cfg.DBName)
+
+	// [?param1=value1&...&paramN=valueN]
+	hasParam := false
+
+	if cfg.AllowAllFiles {
+		hasParam = true
+		buf.WriteString("?allowAllFiles=true")
+	}
+
+	if cfg.AllowCleartextPasswords {
+		writeDSNParam(&buf, &hasParam, "allowCleartextPasswords", "true")
+	}
+
+	if !cfg.AllowNativePasswords {
+		writeDSNParam(&buf, &hasParam, "allowNativePasswords", "false")
+	}
+
+	if cfg.AllowOldPasswords {
+		writeDSNParam(&buf, &hasParam, "allowOldPasswords", "true")
+	}
+
+	if !cfg.CheckConnLiveness {
+		writeDSNParam(&buf, &hasParam, "checkConnLiveness", "false")
+	}
+
+	if cfg.ClientFoundRows {
+		writeDSNParam(&buf, &hasParam, "clientFoundRows", "true")
+	}
+
+	if col := cfg.Collation; col != defaultCollation && len(col) > 0 {
+		writeDSNParam(&buf, &hasParam, "collation", col)
+	}
+
+	if cfg.ColumnsWithAlias {
+		writeDSNParam(&buf, &hasParam, "columnsWithAlias", "true")
+	}
+
+	if cfg.InterpolateParams {
+		writeDSNParam(&buf, &hasParam, "interpolateParams", "true")
+	}
+
+	if cfg.Loc != time.UTC && cfg.Loc != nil {
+		writeDSNParam(&buf, &hasParam, "loc", url.QueryEscape(cfg.Loc.String()))
+	}
+
+	if cfg.MultiStatements {
+		writeDSNParam(&buf, &hasParam, "multiStatements", "true")
+	}
+
+	if cfg.ParseTime {
+		writeDSNParam(&buf, &hasParam, "parseTime", "true")
+	}
+
+	if cfg.ReadTimeout > 0 {
+		writeDSNParam(&buf, &hasParam, "readTimeout", cfg.ReadTimeout.String())
+	}
+
+	if cfg.RejectReadOnly {
+		writeDSNParam(&buf, &hasParam, "rejectReadOnly", "true")
+	}
+
+	if len(cfg.ServerPubKey) > 0 {
+		writeDSNParam(&buf, &hasParam, "serverPubKey", url.QueryEscape(cfg.ServerPubKey))
+	}
+
+	if cfg.Timeout > 0 {
+		writeDSNParam(&buf, &hasParam, "timeout", cfg.Timeout.String())
+	}
+
+	if len(cfg.TLSConfig) > 0 {
+		writeDSNParam(&buf, &hasParam, "tls", url.QueryEscape(cfg.TLSConfig))
+	}
+
+	if cfg.WriteTimeout > 0 {
+		writeDSNParam(&buf, &hasParam, "writeTimeout", cfg.WriteTimeout.String())
+	}
+
+	if cfg.MaxAllowedPacket != defaultMaxAllowedPacket {
+		writeDSNParam(&buf, &hasParam, "maxAllowedPacket", strconv.Itoa(cfg.MaxAllowedPacket))
+	}
+
+	// other params
+	if cfg.Params != nil {
+		var params []string
+		for param := range cfg.Params {
+			params = append(params, param)
+		}
+		sort.Strings(params)
+		for _, param := range params {
+			writeDSNParam(&buf, &hasParam, param, url.QueryEscape(cfg.Params[param]))
+		}
+	}
+
+	return buf.String()
+}
+
+// ParseDSN parses the DSN string to a Config
+func ParseDSN(dsn string) (cfg *Config, err error) {
+	// New config with some default values
+	cfg = NewConfig()
+
+	// [user[:password]@][net[(addr)]]/dbname[?param1=value1&paramN=valueN]
+	// Find the last '/' (since the password or the net addr might contain a '/')
+	foundSlash := false
+	for i := len(dsn) - 1; i >= 0; i-- {
+		if dsn[i] == '/' {
+			foundSlash = true
+			var j, k int
+
+			// left part is empty if i <= 0
+			if i > 0 {
+				// [username[:password]@][protocol[(address)]]
+				// Find the last '@' in dsn[:i]
+				for j = i; j >= 0; j-- {
+					if dsn[j] == '@' {
+						// username[:password]
+						// Find the first ':' in dsn[:j]
+						for k = 0; k < j; k++ {
+							if dsn[k] == ':' {
+								cfg.Passwd = dsn[k+1 : j]
+								break
+							}
+						}
+						cfg.User = dsn[:k]
+
+						break
+					}
+				}
+
+				// [protocol[(address)]]
+				// Find the first '(' in dsn[j+1:i]
+				for k = j + 1; k < i; k++ {
+					if dsn[k] == '(' {
+						// dsn[i-1] must be == ')' if an address is specified
+						if dsn[i-1] != ')' {
+							if strings.ContainsRune(dsn[k+1:i], ')') {
+								return nil, errInvalidDSNUnescaped
+							}
+							return nil, errInvalidDSNAddr
+						}
+						cfg.Addr = dsn[k+1 : i-1]
+						break
+					}
+				}
+				cfg.Net = dsn[j+1 : k]
+			}
+
+			// dbname[?param1=value1&...&paramN=valueN]
+			// Find the first '?' in dsn[i+1:]
+			for j = i + 1; j < len(dsn); j++ {
+				if dsn[j] == '?' {
+					if err = parseDSNParams(cfg, dsn[j+1:]); err != nil {
+						return
+					}
+					break
+				}
+			}
+			cfg.DBName = dsn[i+1 : j]
+
+			break
+		}
+	}
+
+	if !foundSlash && len(dsn) > 0 {
+		return nil, errInvalidDSNNoSlash
+	}
+
+	if err = cfg.normalize(); err != nil {
+		return nil, err
+	}
+	return
+}
+
+// parseDSNParams parses the DSN "query string"
+// Values must be url.QueryEscape'ed
+func parseDSNParams(cfg *Config, params string) (err error) {
+	for _, v := range strings.Split(params, "&") {
+		param := strings.SplitN(v, "=", 2)
+		if len(param) != 2 {
+			continue
+		}
+
+		// cfg params
+		switch value := param[1]; param[0] {
+		// Disable INFILE whitelist / enable all files
+		case "allowAllFiles":
+			var isBool bool
+			cfg.AllowAllFiles, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Use cleartext authentication mode (MySQL 5.5.10+)
+		case "allowCleartextPasswords":
+			var isBool bool
+			cfg.AllowCleartextPasswords, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Use native password authentication
+		case "allowNativePasswords":
+			var isBool bool
+			cfg.AllowNativePasswords, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Use old authentication mode (pre MySQL 4.1)
+		case "allowOldPasswords":
+			var isBool bool
+			cfg.AllowOldPasswords, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Check connections for Liveness before using them
+		case "checkConnLiveness":
+			var isBool bool
+			cfg.CheckConnLiveness, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Switch "rowsAffected" mode
+		case "clientFoundRows":
+			var isBool bool
+			cfg.ClientFoundRows, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Collation
+		case "collation":
+			cfg.Collation = value
+			break
+
+		case "columnsWithAlias":
+			var isBool bool
+			cfg.ColumnsWithAlias, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Compression
+		case "compress":
+			return errors.New("compression not implemented yet")
+
+		// Enable client side placeholder substitution
+		case "interpolateParams":
+			var isBool bool
+			cfg.InterpolateParams, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Time Location
+		case "loc":
+			if value, err = url.QueryUnescape(value); err != nil {
+				return
+			}
+			cfg.Loc, err = time.LoadLocation(value)
+			if err != nil {
+				return
+			}
+
+		// multiple statements in one query
+		case "multiStatements":
+			var isBool bool
+			cfg.MultiStatements, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// time.Time parsing
+		case "parseTime":
+			var isBool bool
+			cfg.ParseTime, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// I/O read Timeout
+		case "readTimeout":
+			cfg.ReadTimeout, err = time.ParseDuration(value)
+			if err != nil {
+				return
+			}
+
+		// Reject read-only connections
+		case "rejectReadOnly":
+			var isBool bool
+			cfg.RejectReadOnly, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Server public key
+		case "serverPubKey":
+			name, err := url.QueryUnescape(value)
+			if err != nil {
+				return fmt.Errorf("invalid value for server pub key name: %v", err)
+			}
+			cfg.ServerPubKey = name
+
+		// Strict mode
+		case "strict":
+			panic("strict mode has been removed. See https://github.com/go-sql-driver/mysql/wiki/strict-mode")
+
+		// Dial Timeout
+		case "timeout":
+			cfg.Timeout, err = time.ParseDuration(value)
+			if err != nil {
+				return
+			}
+
+		// TLS-Encryption
+		case "tls":
+			boolValue, isBool := readBool(value)
+			if isBool {
+				if boolValue {
+					cfg.TLSConfig = "true"
+				} else {
+					cfg.TLSConfig = "false"
+				}
+			} else if vl := strings.ToLower(value); vl == "skip-verify" || vl == "preferred" {
+				cfg.TLSConfig = vl
+			} else {
+				name, err := url.QueryUnescape(value)
+				if err != nil {
+					return fmt.Errorf("invalid value for TLS config name: %v", err)
+				}
+				cfg.TLSConfig = name
+			}
+
+		// I/O write Timeout
+		case "writeTimeout":
+			cfg.WriteTimeout, err = time.ParseDuration(value)
+			if err != nil {
+				return
+			}
+		case "maxAllowedPacket":
+			cfg.MaxAllowedPacket, err = strconv.Atoi(value)
+			if err != nil {
+				return
+			}
+		default:
+			// lazy init
+			if cfg.Params == nil {
+				cfg.Params = make(map[string]string)
+			}
+
+			if cfg.Params[param[0]], err = url.QueryUnescape(value); err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}
+
+func ensureHavePort(addr string) string {
+	if _, _, err := net.SplitHostPort(addr); err != nil {
+		return net.JoinHostPort(addr, "3306")
+	}
+	return addr
+}

vendor/github.com/go-sql-driver/mysql/errors.go

@@ -0,0 +1,65 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"os"
+)
+
+// Various errors the driver might return. Can change between driver versions.
+var (
+	ErrInvalidConn       = errors.New("invalid connection")
+	ErrMalformPkt        = errors.New("malformed packet")
+	ErrNoTLS             = errors.New("TLS requested but server does not support TLS")
+	ErrCleartextPassword = errors.New("this user requires clear text authentication. If you still want to use it, please add 'allowCleartextPasswords=1' to your DSN")
+	ErrNativePassword    = errors.New("this user requires mysql native password authentication.")
+	ErrOldPassword       = errors.New("this user requires old password authentication. If you still want to use it, please add 'allowOldPasswords=1' to your DSN. See also https://github.com/go-sql-driver/mysql/wiki/old_passwords")
+	ErrUnknownPlugin     = errors.New("this authentication plugin is not supported")
+	ErrOldProtocol       = errors.New("MySQL server does not support required protocol 41+")
+	ErrPktSync           = errors.New("commands out of sync. You can't run this command now")
+	ErrPktSyncMul        = errors.New("commands out of sync. Did you run multiple statements at once?")
+	ErrPktTooLarge       = errors.New("packet for query is too large. Try adjusting the 'max_allowed_packet' variable on the server")
+	ErrBusyBuffer        = errors.New("busy buffer")
+
+	// errBadConnNoWrite is used for connection errors where nothing was sent to the database yet.
+	// If this happens first in a function starting a database interaction, it should be replaced by driver.ErrBadConn
+	// to trigger a resend.
+	// See https://github.com/go-sql-driver/mysql/pull/302
+	errBadConnNoWrite = errors.New("bad connection")
+)
+
+var errLog = Logger(log.New(os.Stderr, "[mysql] ", log.Ldate|log.Ltime|log.Lshortfile))
+
+// Logger is used to log critical error messages.
+type Logger interface {
+	Print(v ...interface{})
+}
+
+// SetLogger is used to set the logger for critical errors.
+// The initial logger is os.Stderr.
+func SetLogger(logger Logger) error {
+	if logger == nil {
+		return errors.New("logger is nil")
+	}
+	errLog = logger
+	return nil
+}
+
+// MySQLError is an error type which represents a single MySQL error
+type MySQLError struct {
+	Number  uint16
+	Message string
+}
+
+func (me *MySQLError) Error() string {
+	return fmt.Sprintf("Error %d: %s", me.Number, me.Message)
+}

vendor/github.com/go-sql-driver/mysql/fields.go

@@ -0,0 +1,194 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2017 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql"
+	"reflect"
+)
+
+func (mf *mysqlField) typeDatabaseName() string {
+	switch mf.fieldType {
+	case fieldTypeBit:
+		return "BIT"
+	case fieldTypeBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "TEXT"
+		}
+		return "BLOB"
+	case fieldTypeDate:
+		return "DATE"
+	case fieldTypeDateTime:
+		return "DATETIME"
+	case fieldTypeDecimal:
+		return "DECIMAL"
+	case fieldTypeDouble:
+		return "DOUBLE"
+	case fieldTypeEnum:
+		return "ENUM"
+	case fieldTypeFloat:
+		return "FLOAT"
+	case fieldTypeGeometry:
+		return "GEOMETRY"
+	case fieldTypeInt24:
+		return "MEDIUMINT"
+	case fieldTypeJSON:
+		return "JSON"
+	case fieldTypeLong:
+		return "INT"
+	case fieldTypeLongBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "LONGTEXT"
+		}
+		return "LONGBLOB"
+	case fieldTypeLongLong:
+		return "BIGINT"
+	case fieldTypeMediumBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "MEDIUMTEXT"
+		}
+		return "MEDIUMBLOB"
+	case fieldTypeNewDate:
+		return "DATE"
+	case fieldTypeNewDecimal:
+		return "DECIMAL"
+	case fieldTypeNULL:
+		return "NULL"
+	case fieldTypeSet:
+		return "SET"
+	case fieldTypeShort:
+		return "SMALLINT"
+	case fieldTypeString:
+		if mf.charSet == collations[binaryCollation] {
+			return "BINARY"
+		}
+		return "CHAR"
+	case fieldTypeTime:
+		return "TIME"
+	case fieldTypeTimestamp:
+		return "TIMESTAMP"
+	case fieldTypeTiny:
+		return "TINYINT"
+	case fieldTypeTinyBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "TINYTEXT"
+		}
+		return "TINYBLOB"
+	case fieldTypeVarChar:
+		if mf.charSet == collations[binaryCollation] {
+			return "VARBINARY"
+		}
+		return "VARCHAR"
+	case fieldTypeVarString:
+		if mf.charSet == collations[binaryCollation] {
+			return "VARBINARY"
+		}
+		return "VARCHAR"
+	case fieldTypeYear:
+		return "YEAR"
+	default:
+		return ""
+	}
+}
+
+var (
+	scanTypeFloat32   = reflect.TypeOf(float32(0))
+	scanTypeFloat64   = reflect.TypeOf(float64(0))
+	scanTypeInt8      = reflect.TypeOf(int8(0))
+	scanTypeInt16     = reflect.TypeOf(int16(0))
+	scanTypeInt32     = reflect.TypeOf(int32(0))
+	scanTypeInt64     = reflect.TypeOf(int64(0))
+	scanTypeNullFloat = reflect.TypeOf(sql.NullFloat64{})
+	scanTypeNullInt   = reflect.TypeOf(sql.NullInt64{})
+	scanTypeNullTime  = reflect.TypeOf(NullTime{})
+	scanTypeUint8     = reflect.TypeOf(uint8(0))
+	scanTypeUint16    = reflect.TypeOf(uint16(0))
+	scanTypeUint32    = reflect.TypeOf(uint32(0))
+	scanTypeUint64    = reflect.TypeOf(uint64(0))
+	scanTypeRawBytes  = reflect.TypeOf(sql.RawBytes{})
+	scanTypeUnknown   = reflect.TypeOf(new(interface{}))
+)
+
+type mysqlField struct {
+	tableName string
+	name      string
+	length    uint32
+	flags     fieldFlag
+	fieldType fieldType
+	decimals  byte
+	charSet   uint8
+}
+
+func (mf *mysqlField) scanType() reflect.Type {
+	switch mf.fieldType {
+	case fieldTypeTiny:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint8
+			}
+			return scanTypeInt8
+		}
+		return scanTypeNullInt
+
+	case fieldTypeShort, fieldTypeYear:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint16
+			}
+			return scanTypeInt16
+		}
+		return scanTypeNullInt
+
+	case fieldTypeInt24, fieldTypeLong:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint32
+			}
+			return scanTypeInt32
+		}
+		return scanTypeNullInt
+
+	case fieldTypeLongLong:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint64
+			}
+			return scanTypeInt64
+		}
+		return scanTypeNullInt
+
+	case fieldTypeFloat:
+		if mf.flags&flagNotNULL != 0 {
+			return scanTypeFloat32
+		}
+		return scanTypeNullFloat
+
+	case fieldTypeDouble:
+		if mf.flags&flagNotNULL != 0 {
+			return scanTypeFloat64
+		}
+		return scanTypeNullFloat
+
+	case fieldTypeDecimal, fieldTypeNewDecimal, fieldTypeVarChar,
+		fieldTypeBit, fieldTypeEnum, fieldTypeSet, fieldTypeTinyBLOB,
+		fieldTypeMediumBLOB, fieldTypeLongBLOB, fieldTypeBLOB,
+		fieldTypeVarString, fieldTypeString, fieldTypeGeometry, fieldTypeJSON,
+		fieldTypeTime:
+		return scanTypeRawBytes
+
+	case fieldTypeDate, fieldTypeNewDate,
+		fieldTypeTimestamp, fieldTypeDateTime:
+		// NullTime is always returned for more consistent behavior as it can
+		// handle both cases of parseTime regardless if the field is nullable.
+		return scanTypeNullTime
+
+	default:
+		return scanTypeUnknown
+	}
+}

vendor/github.com/go-sql-driver/mysql/infile.go

@@ -0,0 +1,182 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"sync"
+)
+
+var (
+	fileRegister       map[string]bool
+	fileRegisterLock   sync.RWMutex
+	readerRegister     map[string]func() io.Reader
+	readerRegisterLock sync.RWMutex
+)
+
+// RegisterLocalFile adds the given file to the file whitelist,
+// so that it can be used by "LOAD DATA LOCAL INFILE <filepath>".
+// Alternatively you can allow the use of all local files with
+// the DSN parameter 'allowAllFiles=true'
+//
+//  filePath := "/home/gopher/data.csv"
+//  mysql.RegisterLocalFile(filePath)
+//  err := db.Exec("LOAD DATA LOCAL INFILE '" + filePath + "' INTO TABLE foo")
+//  if err != nil {
+//  ...
+//
+func RegisterLocalFile(filePath string) {
+	fileRegisterLock.Lock()
+	// lazy map init
+	if fileRegister == nil {
+		fileRegister = make(map[string]bool)
+	}
+
+	fileRegister[strings.Trim(filePath, `"`)] = true
+	fileRegisterLock.Unlock()
+}
+
+// DeregisterLocalFile removes the given filepath from the whitelist.
+func DeregisterLocalFile(filePath string) {
+	fileRegisterLock.Lock()
+	delete(fileRegister, strings.Trim(filePath, `"`))
+	fileRegisterLock.Unlock()
+}
+
+// RegisterReaderHandler registers a handler function which is used
+// to receive a io.Reader.
+// The Reader can be used by "LOAD DATA LOCAL INFILE Reader::<name>".
+// If the handler returns a io.ReadCloser Close() is called when the
+// request is finished.
+//
+//  mysql.RegisterReaderHandler("data", func() io.Reader {
+//  	var csvReader io.Reader // Some Reader that returns CSV data
+//  	... // Open Reader here
+//  	return csvReader
+//  })
+//  err := db.Exec("LOAD DATA LOCAL INFILE 'Reader::data' INTO TABLE foo")
+//  if err != nil {
+//  ...
+//
+func RegisterReaderHandler(name string, handler func() io.Reader) {
+	readerRegisterLock.Lock()
+	// lazy map init
+	if readerRegister == nil {
+		readerRegister = make(map[string]func() io.Reader)
+	}
+
+	readerRegister[name] = handler
+	readerRegisterLock.Unlock()
+}
+
+// DeregisterReaderHandler removes the ReaderHandler function with
+// the given name from the registry.
+func DeregisterReaderHandler(name string) {
+	readerRegisterLock.Lock()
+	delete(readerRegister, name)
+	readerRegisterLock.Unlock()
+}
+
+func deferredClose(err *error, closer io.Closer) {
+	closeErr := closer.Close()
+	if *err == nil {
+		*err = closeErr
+	}
+}
+
+func (mc *mysqlConn) handleInFileRequest(name string) (err error) {
+	var rdr io.Reader
+	var data []byte
+	packetSize := 16 * 1024 // 16KB is small enough for disk readahead and large enough for TCP
+	if mc.maxWriteSize < packetSize {
+		packetSize = mc.maxWriteSize
+	}
+
+	if idx := strings.Index(name, "Reader::"); idx == 0 || (idx > 0 && name[idx-1] == '/') { // io.Reader
+		// The server might return an an absolute path. See issue #355.
+		name = name[idx+8:]
+
+		readerRegisterLock.RLock()
+		handler, inMap := readerRegister[name]
+		readerRegisterLock.RUnlock()
+
+		if inMap {
+			rdr = handler()
+			if rdr != nil {
+				if cl, ok := rdr.(io.Closer); ok {
+					defer deferredClose(&err, cl)
+				}
+			} else {
+				err = fmt.Errorf("Reader '%s' is <nil>", name)
+			}
+		} else {
+			err = fmt.Errorf("Reader '%s' is not registered", name)
+		}
+	} else { // File
+		name = strings.Trim(name, `"`)
+		fileRegisterLock.RLock()
+		fr := fileRegister[name]
+		fileRegisterLock.RUnlock()
+		if mc.cfg.AllowAllFiles || fr {
+			var file *os.File
+			var fi os.FileInfo
+
+			if file, err = os.Open(name); err == nil {
+				defer deferredClose(&err, file)
+
+				// get file size
+				if fi, err = file.Stat(); err == nil {
+					rdr = file
+					if fileSize := int(fi.Size()); fileSize < packetSize {
+						packetSize = fileSize
+					}
+				}
+			}
+		} else {
+			err = fmt.Errorf("local file '%s' is not registered", name)
+		}
+	}
+
+	// send content packets
+	// if packetSize == 0, the Reader contains no data
+	if err == nil && packetSize > 0 {
+		data := make([]byte, 4+packetSize)
+		var n int
+		for err == nil {
+			n, err = rdr.Read(data[4:])
+			if n > 0 {
+				if ioErr := mc.writePacket(data[:4+n]); ioErr != nil {
+					return ioErr
+				}
+			}
+		}
+		if err == io.EOF {
+			err = nil
+		}
+	}
+
+	// send empty packet (termination)
+	if data == nil {
+		data = make([]byte, 4)
+	}
+	if ioErr := mc.writePacket(data[:4]); ioErr != nil {
+		return ioErr
+	}
+
+	// read OK packet
+	if err == nil {
+		return mc.readResultOK()
+	}
+
+	mc.readPacket()
+	return err
+}

vendor/github.com/go-sql-driver/mysql/nulltime.go

@@ -0,0 +1,50 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql/driver"
+	"fmt"
+	"time"
+)
+
+// Scan implements the Scanner interface.
+// The value type must be time.Time or string / []byte (formatted time-string),
+// otherwise Scan fails.
+func (nt *NullTime) Scan(value interface{}) (err error) {
+	if value == nil {
+		nt.Time, nt.Valid = time.Time{}, false
+		return
+	}
+
+	switch v := value.(type) {
+	case time.Time:
+		nt.Time, nt.Valid = v, true
+		return
+	case []byte:
+		nt.Time, err = parseDateTime(string(v), time.UTC)
+		nt.Valid = (err == nil)
+		return
+	case string:
+		nt.Time, err = parseDateTime(v, time.UTC)
+		nt.Valid = (err == nil)
+		return
+	}
+
+	nt.Valid = false
+	return fmt.Errorf("Can't convert %T to time.Time", value)
+}
+
+// Value implements the driver Valuer interface.
+func (nt NullTime) Value() (driver.Value, error) {
+	if !nt.Valid {
+		return nil, nil
+	}
+	return nt.Time, nil
+}

vendor/github.com/go-sql-driver/mysql/nulltime_go113.go

@@ -0,0 +1,31 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build go1.13
+
+package mysql
+
+import (
+	"database/sql"
+)
+
+// NullTime represents a time.Time that may be NULL.
+// NullTime implements the Scanner interface so
+// it can be used as a scan destination:
+//
+//  var nt NullTime
+//  err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt)
+//  ...
+//  if nt.Valid {
+//     // use nt.Time
+//  } else {
+//     // NULL value
+//  }
+//
+// This NullTime implementation is not driver-specific
+type NullTime sql.NullTime

vendor/github.com/go-sql-driver/mysql/nulltime_legacy.go

@@ -0,0 +1,34 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build !go1.13
+
+package mysql
+
+import (
+	"time"
+)
+
+// NullTime represents a time.Time that may be NULL.
+// NullTime implements the Scanner interface so
+// it can be used as a scan destination:
+//
+//  var nt NullTime
+//  err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt)
+//  ...
+//  if nt.Valid {
+//     // use nt.Time
+//  } else {
+//     // NULL value
+//  }
+//
+// This NullTime implementation is not driver-specific
+type NullTime struct {
+	Time  time.Time
+	Valid bool // Valid is true if Time is not NULL
+}

vendor/github.com/go-sql-driver/mysql/result.go

@@ -0,0 +1,22 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+type mysqlResult struct {
+	affectedRows int64
+	insertId     int64
+}
+
+func (res *mysqlResult) LastInsertId() (int64, error) {
+	return res.insertId, nil
+}
+
+func (res *mysqlResult) RowsAffected() (int64, error) {
+	return res.affectedRows, nil
+}

vendor/github.com/go-sql-driver/mysql/rows.go

@@ -0,0 +1,223 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql/driver"
+	"io"
+	"math"
+	"reflect"
+)
+
+type resultSet struct {
+	columns     []mysqlField
+	columnNames []string
+	done        bool
+}
+
+type mysqlRows struct {
+	mc     *mysqlConn
+	rs     resultSet
+	finish func()
+}
+
+type binaryRows struct {
+	mysqlRows
+}
+
+type textRows struct {
+	mysqlRows
+}
+
+func (rows *mysqlRows) Columns() []string {
+	if rows.rs.columnNames != nil {
+		return rows.rs.columnNames
+	}
+
+	columns := make([]string, len(rows.rs.columns))
+	if rows.mc != nil && rows.mc.cfg.ColumnsWithAlias {
+		for i := range columns {
+			if tableName := rows.rs.columns[i].tableName; len(tableName) > 0 {
+				columns[i] = tableName + "." + rows.rs.columns[i].name
+			} else {
+				columns[i] = rows.rs.columns[i].name
+			}
+		}
+	} else {
+		for i := range columns {
+			columns[i] = rows.rs.columns[i].name
+		}
+	}
+
+	rows.rs.columnNames = columns
+	return columns
+}
+
+func (rows *mysqlRows) ColumnTypeDatabaseTypeName(i int) string {
+	return rows.rs.columns[i].typeDatabaseName()
+}
+
+// func (rows *mysqlRows) ColumnTypeLength(i int) (length int64, ok bool) {
+// 	return int64(rows.rs.columns[i].length), true
+// }
+
+func (rows *mysqlRows) ColumnTypeNullable(i int) (nullable, ok bool) {
+	return rows.rs.columns[i].flags&flagNotNULL == 0, true
+}
+
+func (rows *mysqlRows) ColumnTypePrecisionScale(i int) (int64, int64, bool) {
+	column := rows.rs.columns[i]
+	decimals := int64(column.decimals)
+
+	switch column.fieldType {
+	case fieldTypeDecimal, fieldTypeNewDecimal:
+		if decimals > 0 {
+			return int64(column.length) - 2, decimals, true
+		}
+		return int64(column.length) - 1, decimals, true
+	case fieldTypeTimestamp, fieldTypeDateTime, fieldTypeTime:
+		return decimals, decimals, true
+	case fieldTypeFloat, fieldTypeDouble:
+		if decimals == 0x1f {
+			return math.MaxInt64, math.MaxInt64, true
+		}
+		return math.MaxInt64, decimals, true
+	}
+
+	return 0, 0, false
+}
+
+func (rows *mysqlRows) ColumnTypeScanType(i int) reflect.Type {
+	return rows.rs.columns[i].scanType()
+}
+
+func (rows *mysqlRows) Close() (err error) {
+	if f := rows.finish; f != nil {
+		f()
+		rows.finish = nil
+	}
+
+	mc := rows.mc
+	if mc == nil {
+		return nil
+	}
+	if err := mc.error(); err != nil {
+		return err
+	}
+
+	// flip the buffer for this connection if we need to drain it.
+	// note that for a successful query (i.e. one where rows.next()
+	// has been called until it returns false), `rows.mc` will be nil
+	// by the time the user calls `(*Rows).Close`, so we won't reach this
+	// see: https://github.com/golang/go/commit/651ddbdb5056ded455f47f9c494c67b389622a47
+	mc.buf.flip()
+
+	// Remove unread packets from stream
+	if !rows.rs.done {
+		err = mc.readUntilEOF()
+	}
+	if err == nil {
+		if err = mc.discardResults(); err != nil {
+			return err
+		}
+	}
+
+	rows.mc = nil
+	return err
+}
+
+func (rows *mysqlRows) HasNextResultSet() (b bool) {
+	if rows.mc == nil {
+		return false
+	}
+	return rows.mc.status&statusMoreResultsExists != 0
+}
+
+func (rows *mysqlRows) nextResultSet() (int, error) {
+	if rows.mc == nil {
+		return 0, io.EOF
+	}
+	if err := rows.mc.error(); err != nil {
+		return 0, err
+	}
+
+	// Remove unread packets from stream
+	if !rows.rs.done {
+		if err := rows.mc.readUntilEOF(); err != nil {
+			return 0, err
+		}
+		rows.rs.done = true
+	}
+
+	if !rows.HasNextResultSet() {
+		rows.mc = nil
+		return 0, io.EOF
+	}
+	rows.rs = resultSet{}
+	return rows.mc.readResultSetHeaderPacket()
+}
+
+func (rows *mysqlRows) nextNotEmptyResultSet() (int, error) {
+	for {
+		resLen, err := rows.nextResultSet()
+		if err != nil {
+			return 0, err
+		}
+
+		if resLen > 0 {
+			return resLen, nil
+		}
+
+		rows.rs.done = true
+	}
+}
+
+func (rows *binaryRows) NextResultSet() error {
+	resLen, err := rows.nextNotEmptyResultSet()
+	if err != nil {
+		return err
+	}
+
+	rows.rs.columns, err = rows.mc.readColumns(resLen)
+	return err
+}
+
+func (rows *binaryRows) Next(dest []driver.Value) error {
+	if mc := rows.mc; mc != nil {
+		if err := mc.error(); err != nil {
+			return err
+		}
+
+		// Fetch next row from stream
+		return rows.readRow(dest)
+	}
+	return io.EOF
+}
+
+func (rows *textRows) NextResultSet() (err error) {
+	resLen, err := rows.nextNotEmptyResultSet()
+	if err != nil {
+		return err
+	}
+
+	rows.rs.columns, err = rows.mc.readColumns(resLen)
+	return err
+}
+
+func (rows *textRows) Next(dest []driver.Value) error {
+	if mc := rows.mc; mc != nil {
+		if err := mc.error(); err != nil {
+			return err
+		}
+
+		// Fetch next row from stream
+		return rows.readRow(dest)
+	}
+	return io.EOF
+}

vendor/github.com/go-sql-driver/mysql/statement.go

@@ -0,0 +1,204 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql/driver"
+	"fmt"
+	"io"
+	"reflect"
+)
+
+type mysqlStmt struct {
+	mc         *mysqlConn
+	id         uint32
+	paramCount int
+}
+
+func (stmt *mysqlStmt) Close() error {
+	if stmt.mc == nil || stmt.mc.closed.IsSet() {
+		// driver.Stmt.Close can be called more than once, thus this function
+		// has to be idempotent.
+		// See also Issue #450 and golang/go#16019.
+		//errLog.Print(ErrInvalidConn)
+		return driver.ErrBadConn
+	}
+
+	err := stmt.mc.writeCommandPacketUint32(comStmtClose, stmt.id)
+	stmt.mc = nil
+	return err
+}
+
+func (stmt *mysqlStmt) NumInput() int {
+	return stmt.paramCount
+}
+
+func (stmt *mysqlStmt) ColumnConverter(idx int) driver.ValueConverter {
+	return converter{}
+}
+
+func (stmt *mysqlStmt) Exec(args []driver.Value) (driver.Result, error) {
+	if stmt.mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	// Send command
+	err := stmt.writeExecutePacket(args)
+	if err != nil {
+		return nil, stmt.mc.markBadConn(err)
+	}
+
+	mc := stmt.mc
+
+	mc.affectedRows = 0
+	mc.insertId = 0
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err != nil {
+		return nil, err
+	}
+
+	if resLen > 0 {
+		// Columns
+		if err = mc.readUntilEOF(); err != nil {
+			return nil, err
+		}
+
+		// Rows
+		if err := mc.readUntilEOF(); err != nil {
+			return nil, err
+		}
+	}
+
+	if err := mc.discardResults(); err != nil {
+		return nil, err
+	}
+
+	return &mysqlResult{
+		affectedRows: int64(mc.affectedRows),
+		insertId:     int64(mc.insertId),
+	}, nil
+}
+
+func (stmt *mysqlStmt) Query(args []driver.Value) (driver.Rows, error) {
+	return stmt.query(args)
+}
+
+func (stmt *mysqlStmt) query(args []driver.Value) (*binaryRows, error) {
+	if stmt.mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	// Send command
+	err := stmt.writeExecutePacket(args)
+	if err != nil {
+		return nil, stmt.mc.markBadConn(err)
+	}
+
+	mc := stmt.mc
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err != nil {
+		return nil, err
+	}
+
+	rows := new(binaryRows)
+
+	if resLen > 0 {
+		rows.mc = mc
+		rows.rs.columns, err = mc.readColumns(resLen)
+	} else {
+		rows.rs.done = true
+
+		switch err := rows.NextResultSet(); err {
+		case nil, io.EOF:
+			return rows, nil
+		default:
+			return nil, err
+		}
+	}
+
+	return rows, err
+}
+
+type converter struct{}
+
+// ConvertValue mirrors the reference/default converter in database/sql/driver
+// with _one_ exception.  We support uint64 with their high bit and the default
+// implementation does not.  This function should be kept in sync with
+// database/sql/driver defaultConverter.ConvertValue() except for that
+// deliberate difference.
+func (c converter) ConvertValue(v interface{}) (driver.Value, error) {
+	if driver.IsValue(v) {
+		return v, nil
+	}
+
+	if vr, ok := v.(driver.Valuer); ok {
+		sv, err := callValuerValue(vr)
+		if err != nil {
+			return nil, err
+		}
+		if !driver.IsValue(sv) {
+			return nil, fmt.Errorf("non-Value type %T returned from Value", sv)
+		}
+		return sv, nil
+	}
+
+	rv := reflect.ValueOf(v)
+	switch rv.Kind() {
+	case reflect.Ptr:
+		// indirect pointers
+		if rv.IsNil() {
+			return nil, nil
+		} else {
+			return c.ConvertValue(rv.Elem().Interface())
+		}
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return rv.Int(), nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return rv.Uint(), nil
+	case reflect.Float32, reflect.Float64:
+		return rv.Float(), nil
+	case reflect.Bool:
+		return rv.Bool(), nil
+	case reflect.Slice:
+		ek := rv.Type().Elem().Kind()
+		if ek == reflect.Uint8 {
+			return rv.Bytes(), nil
+		}
+		return nil, fmt.Errorf("unsupported type %T, a slice of %s", v, ek)
+	case reflect.String:
+		return rv.String(), nil
+	}
+	return nil, fmt.Errorf("unsupported type %T, a %s", v, rv.Kind())
+}
+
+var valuerReflectType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
+
+// callValuerValue returns vr.Value(), with one exception:
+// If vr.Value is an auto-generated method on a pointer type and the
+// pointer is nil, it would panic at runtime in the panicwrap
+// method. Treat it like nil instead.
+//
+// This is so people can implement driver.Value on value types and
+// still use nil pointers to those types to mean nil/NULL, just like
+// string/*string.
+//
+// This is an exact copy of the same-named unexported function from the
+// database/sql package.
+func callValuerValue(vr driver.Valuer) (v driver.Value, err error) {
+	if rv := reflect.ValueOf(vr); rv.Kind() == reflect.Ptr &&
+		rv.IsNil() &&
+		rv.Type().Elem().Implements(valuerReflectType) {
+		return nil, nil
+	}
+	return vr.Value()
+}

vendor/github.com/go-sql-driver/mysql/transaction.go

@@ -0,0 +1,31 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+type mysqlTx struct {
+	mc *mysqlConn
+}
+
+func (tx *mysqlTx) Commit() (err error) {
+	if tx.mc == nil || tx.mc.closed.IsSet() {
+		return ErrInvalidConn
+	}
+	err = tx.mc.exec("COMMIT")
+	tx.mc = nil
+	return
+}
+
+func (tx *mysqlTx) Rollback() (err error) {
+	if tx.mc == nil || tx.mc.closed.IsSet() {
+		return ErrInvalidConn
+	}
+	err = tx.mc.exec("ROLLBACK")
+	tx.mc = nil
+	return
+}

vendor/github.com/go-sql-driver/mysql/utils.go

@@ -0,0 +1,701 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"crypto/tls"
+	"database/sql"
+	"database/sql/driver"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// Registry for custom tls.Configs
+var (
+	tlsConfigLock     sync.RWMutex
+	tlsConfigRegistry map[string]*tls.Config
+)
+
+// RegisterTLSConfig registers a custom tls.Config to be used with sql.Open.
+// Use the key as a value in the DSN where tls=value.
+//
+// Note: The provided tls.Config is exclusively owned by the driver after
+// registering it.
+//
+//  rootCertPool := x509.NewCertPool()
+//  pem, err := ioutil.ReadFile("/path/ca-cert.pem")
+//  if err != nil {
+//      log.Fatal(err)
+//  }
+//  if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
+//      log.Fatal("Failed to append PEM.")
+//  }
+//  clientCert := make([]tls.Certificate, 0, 1)
+//  certs, err := tls.LoadX509KeyPair("/path/client-cert.pem", "/path/client-key.pem")
+//  if err != nil {
+//      log.Fatal(err)
+//  }
+//  clientCert = append(clientCert, certs)
+//  mysql.RegisterTLSConfig("custom", &tls.Config{
+//      RootCAs: rootCertPool,
+//      Certificates: clientCert,
+//  })
+//  db, err := sql.Open("mysql", "user@tcp(localhost:3306)/test?tls=custom")
+//
+func RegisterTLSConfig(key string, config *tls.Config) error {
+	if _, isBool := readBool(key); isBool || strings.ToLower(key) == "skip-verify" || strings.ToLower(key) == "preferred" {
+		return fmt.Errorf("key '%s' is reserved", key)
+	}
+
+	tlsConfigLock.Lock()
+	if tlsConfigRegistry == nil {
+		tlsConfigRegistry = make(map[string]*tls.Config)
+	}
+
+	tlsConfigRegistry[key] = config
+	tlsConfigLock.Unlock()
+	return nil
+}
+
+// DeregisterTLSConfig removes the tls.Config associated with key.
+func DeregisterTLSConfig(key string) {
+	tlsConfigLock.Lock()
+	if tlsConfigRegistry != nil {
+		delete(tlsConfigRegistry, key)
+	}
+	tlsConfigLock.Unlock()
+}
+
+func getTLSConfigClone(key string) (config *tls.Config) {
+	tlsConfigLock.RLock()
+	if v, ok := tlsConfigRegistry[key]; ok {
+		config = v.Clone()
+	}
+	tlsConfigLock.RUnlock()
+	return
+}
+
+// Returns the bool value of the input.
+// The 2nd return value indicates if the input was a valid bool value
+func readBool(input string) (value bool, valid bool) {
+	switch input {
+	case "1", "true", "TRUE", "True":
+		return true, true
+	case "0", "false", "FALSE", "False":
+		return false, true
+	}
+
+	// Not a valid bool value
+	return
+}
+
+/******************************************************************************
+*                           Time related utils                                *
+******************************************************************************/
+
+func parseDateTime(str string, loc *time.Location) (t time.Time, err error) {
+	base := "0000-00-00 00:00:00.0000000"
+	switch len(str) {
+	case 10, 19, 21, 22, 23, 24, 25, 26: // up to "YYYY-MM-DD HH:MM:SS.MMMMMM"
+		if str == base[:len(str)] {
+			return
+		}
+		t, err = time.Parse(timeFormat[:len(str)], str)
+	default:
+		err = fmt.Errorf("invalid time string: %s", str)
+		return
+	}
+
+	// Adjust location
+	if err == nil && loc != time.UTC {
+		y, mo, d := t.Date()
+		h, mi, s := t.Clock()
+		t, err = time.Date(y, mo, d, h, mi, s, t.Nanosecond(), loc), nil
+	}
+
+	return
+}
+
+func parseBinaryDateTime(num uint64, data []byte, loc *time.Location) (driver.Value, error) {
+	switch num {
+	case 0:
+		return time.Time{}, nil
+	case 4:
+		return time.Date(
+			int(binary.LittleEndian.Uint16(data[:2])), // year
+			time.Month(data[2]),                       // month
+			int(data[3]),                              // day
+			0, 0, 0, 0,
+			loc,
+		), nil
+	case 7:
+		return time.Date(
+			int(binary.LittleEndian.Uint16(data[:2])), // year
+			time.Month(data[2]),                       // month
+			int(data[3]),                              // day
+			int(data[4]),                              // hour
+			int(data[5]),                              // minutes
+			int(data[6]),                              // seconds
+			0,
+			loc,
+		), nil
+	case 11:
+		return time.Date(
+			int(binary.LittleEndian.Uint16(data[:2])), // year
+			time.Month(data[2]),                       // month
+			int(data[3]),                              // day
+			int(data[4]),                              // hour
+			int(data[5]),                              // minutes
+			int(data[6]),                              // seconds
+			int(binary.LittleEndian.Uint32(data[7:11]))*1000, // nanoseconds
+			loc,
+		), nil
+	}
+	return nil, fmt.Errorf("invalid DATETIME packet length %d", num)
+}
+
+// zeroDateTime is used in formatBinaryDateTime to avoid an allocation
+// if the DATE or DATETIME has the zero value.
+// It must never be changed.
+// The current behavior depends on database/sql copying the result.
+var zeroDateTime = []byte("0000-00-00 00:00:00.000000")
+
+const digits01 = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"
+const digits10 = "0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999"
+
+func appendMicrosecs(dst, src []byte, decimals int) []byte {
+	if decimals <= 0 {
+		return dst
+	}
+	if len(src) == 0 {
+		return append(dst, ".000000"[:decimals+1]...)
+	}
+
+	microsecs := binary.LittleEndian.Uint32(src[:4])
+	p1 := byte(microsecs / 10000)
+	microsecs -= 10000 * uint32(p1)
+	p2 := byte(microsecs / 100)
+	microsecs -= 100 * uint32(p2)
+	p3 := byte(microsecs)
+
+	switch decimals {
+	default:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2], digits01[p2],
+			digits10[p3], digits01[p3],
+		)
+	case 1:
+		return append(dst, '.',
+			digits10[p1],
+		)
+	case 2:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+		)
+	case 3:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2],
+		)
+	case 4:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2], digits01[p2],
+		)
+	case 5:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2], digits01[p2],
+			digits10[p3],
+		)
+	}
+}
+
+func formatBinaryDateTime(src []byte, length uint8) (driver.Value, error) {
+	// length expects the deterministic length of the zero value,
+	// negative time and 100+ hours are automatically added if needed
+	if len(src) == 0 {
+		return zeroDateTime[:length], nil
+	}
+	var dst []byte      // return value
+	var p1, p2, p3 byte // current digit pair
+
+	switch length {
+	case 10, 19, 21, 22, 23, 24, 25, 26:
+	default:
+		t := "DATE"
+		if length > 10 {
+			t += "TIME"
+		}
+		return nil, fmt.Errorf("illegal %s length %d", t, length)
+	}
+	switch len(src) {
+	case 4, 7, 11:
+	default:
+		t := "DATE"
+		if length > 10 {
+			t += "TIME"
+		}
+		return nil, fmt.Errorf("illegal %s packet length %d", t, len(src))
+	}
+	dst = make([]byte, 0, length)
+	// start with the date
+	year := binary.LittleEndian.Uint16(src[:2])
+	pt := year / 100
+	p1 = byte(year - 100*uint16(pt))
+	p2, p3 = src[2], src[3]
+	dst = append(dst,
+		digits10[pt], digits01[pt],
+		digits10[p1], digits01[p1], '-',
+		digits10[p2], digits01[p2], '-',
+		digits10[p3], digits01[p3],
+	)
+	if length == 10 {
+		return dst, nil
+	}
+	if len(src) == 4 {
+		return append(dst, zeroDateTime[10:length]...), nil
+	}
+	dst = append(dst, ' ')
+	p1 = src[4] // hour
+	src = src[5:]
+
+	// p1 is 2-digit hour, src is after hour
+	p2, p3 = src[0], src[1]
+	dst = append(dst,
+		digits10[p1], digits01[p1], ':',
+		digits10[p2], digits01[p2], ':',
+		digits10[p3], digits01[p3],
+	)
+	return appendMicrosecs(dst, src[2:], int(length)-20), nil
+}
+
+func formatBinaryTime(src []byte, length uint8) (driver.Value, error) {
+	// length expects the deterministic length of the zero value,
+	// negative time and 100+ hours are automatically added if needed
+	if len(src) == 0 {
+		return zeroDateTime[11 : 11+length], nil
+	}
+	var dst []byte // return value
+
+	switch length {
+	case
+		8,                      // time (can be up to 10 when negative and 100+ hours)
+		10, 11, 12, 13, 14, 15: // time with fractional seconds
+	default:
+		return nil, fmt.Errorf("illegal TIME length %d", length)
+	}
+	switch len(src) {
+	case 8, 12:
+	default:
+		return nil, fmt.Errorf("invalid TIME packet length %d", len(src))
+	}
+	// +2 to enable negative time and 100+ hours
+	dst = make([]byte, 0, length+2)
+	if src[0] == 1 {
+		dst = append(dst, '-')
+	}
+	days := binary.LittleEndian.Uint32(src[1:5])
+	hours := int64(days)*24 + int64(src[5])
+
+	if hours >= 100 {
+		dst = strconv.AppendInt(dst, hours, 10)
+	} else {
+		dst = append(dst, digits10[hours], digits01[hours])
+	}
+
+	min, sec := src[6], src[7]
+	dst = append(dst, ':',
+		digits10[min], digits01[min], ':',
+		digits10[sec], digits01[sec],
+	)
+	return appendMicrosecs(dst, src[8:], int(length)-9), nil
+}
+
+/******************************************************************************
+*                       Convert from and to bytes                             *
+******************************************************************************/
+
+func uint64ToBytes(n uint64) []byte {
+	return []byte{
+		byte(n),
+		byte(n >> 8),
+		byte(n >> 16),
+		byte(n >> 24),
+		byte(n >> 32),
+		byte(n >> 40),
+		byte(n >> 48),
+		byte(n >> 56),
+	}
+}
+
+func uint64ToString(n uint64) []byte {
+	var a [20]byte
+	i := 20
+
+	// U+0030 = 0
+	// ...
+	// U+0039 = 9
+
+	var q uint64
+	for n >= 10 {
+		i--
+		q = n / 10
+		a[i] = uint8(n-q*10) + 0x30
+		n = q
+	}
+
+	i--
+	a[i] = uint8(n) + 0x30
+
+	return a[i:]
+}
+
+// treats string value as unsigned integer representation
+func stringToInt(b []byte) int {
+	val := 0
+	for i := range b {
+		val *= 10
+		val += int(b[i] - 0x30)
+	}
+	return val
+}
+
+// returns the string read as a bytes slice, wheter the value is NULL,
+// the number of bytes read and an error, in case the string is longer than
+// the input slice
+func readLengthEncodedString(b []byte) ([]byte, bool, int, error) {
+	// Get length
+	num, isNull, n := readLengthEncodedInteger(b)
+	if num < 1 {
+		return b[n:n], isNull, n, nil
+	}
+
+	n += int(num)
+
+	// Check data length
+	if len(b) >= n {
+		return b[n-int(num) : n : n], false, n, nil
+	}
+	return nil, false, n, io.EOF
+}
+
+// returns the number of bytes skipped and an error, in case the string is
+// longer than the input slice
+func skipLengthEncodedString(b []byte) (int, error) {
+	// Get length
+	num, _, n := readLengthEncodedInteger(b)
+	if num < 1 {
+		return n, nil
+	}
+
+	n += int(num)
+
+	// Check data length
+	if len(b) >= n {
+		return n, nil
+	}
+	return n, io.EOF
+}
+
+// returns the number read, whether the value is NULL and the number of bytes read
+func readLengthEncodedInteger(b []byte) (uint64, bool, int) {
+	// See issue #349
+	if len(b) == 0 {
+		return 0, true, 1
+	}
+
+	switch b[0] {
+	// 251: NULL
+	case 0xfb:
+		return 0, true, 1
+
+	// 252: value of following 2
+	case 0xfc:
+		return uint64(b[1]) | uint64(b[2])<<8, false, 3
+
+	// 253: value of following 3
+	case 0xfd:
+		return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16, false, 4
+
+	// 254: value of following 8
+	case 0xfe:
+		return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16 |
+				uint64(b[4])<<24 | uint64(b[5])<<32 | uint64(b[6])<<40 |
+				uint64(b[7])<<48 | uint64(b[8])<<56,
+			false, 9
+	}
+
+	// 0-250: value of first byte
+	return uint64(b[0]), false, 1
+}
+
+// encodes a uint64 value and appends it to the given bytes slice
+func appendLengthEncodedInteger(b []byte, n uint64) []byte {
+	switch {
+	case n <= 250:
+		return append(b, byte(n))
+
+	case n <= 0xffff:
+		return append(b, 0xfc, byte(n), byte(n>>8))
+
+	case n <= 0xffffff:
+		return append(b, 0xfd, byte(n), byte(n>>8), byte(n>>16))
+	}
+	return append(b, 0xfe, byte(n), byte(n>>8), byte(n>>16), byte(n>>24),
+		byte(n>>32), byte(n>>40), byte(n>>48), byte(n>>56))
+}
+
+// reserveBuffer checks cap(buf) and expand buffer to len(buf) + appendSize.
+// If cap(buf) is not enough, reallocate new buffer.
+func reserveBuffer(buf []byte, appendSize int) []byte {
+	newSize := len(buf) + appendSize
+	if cap(buf) < newSize {
+		// Grow buffer exponentially
+		newBuf := make([]byte, len(buf)*2+appendSize)
+		copy(newBuf, buf)
+		buf = newBuf
+	}
+	return buf[:newSize]
+}
+
+// escapeBytesBackslash escapes []byte with backslashes (\)
+// This escapes the contents of a string (provided as []byte) by adding backslashes before special
+// characters, and turning others into specific escape sequences, such as
+// turning newlines into \n and null bytes into \0.
+// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L823-L932
+func escapeBytesBackslash(buf, v []byte) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for _, c := range v {
+		switch c {
+		case '\x00':
+			buf[pos] = '\\'
+			buf[pos+1] = '0'
+			pos += 2
+		case '\n':
+			buf[pos] = '\\'
+			buf[pos+1] = 'n'
+			pos += 2
+		case '\r':
+			buf[pos] = '\\'
+			buf[pos+1] = 'r'
+			pos += 2
+		case '\x1a':
+			buf[pos] = '\\'
+			buf[pos+1] = 'Z'
+			pos += 2
+		case '\'':
+			buf[pos] = '\\'
+			buf[pos+1] = '\''
+			pos += 2
+		case '"':
+			buf[pos] = '\\'
+			buf[pos+1] = '"'
+			pos += 2
+		case '\\':
+			buf[pos] = '\\'
+			buf[pos+1] = '\\'
+			pos += 2
+		default:
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+// escapeStringBackslash is similar to escapeBytesBackslash but for string.
+func escapeStringBackslash(buf []byte, v string) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for i := 0; i < len(v); i++ {
+		c := v[i]
+		switch c {
+		case '\x00':
+			buf[pos] = '\\'
+			buf[pos+1] = '0'
+			pos += 2
+		case '\n':
+			buf[pos] = '\\'
+			buf[pos+1] = 'n'
+			pos += 2
+		case '\r':
+			buf[pos] = '\\'
+			buf[pos+1] = 'r'
+			pos += 2
+		case '\x1a':
+			buf[pos] = '\\'
+			buf[pos+1] = 'Z'
+			pos += 2
+		case '\'':
+			buf[pos] = '\\'
+			buf[pos+1] = '\''
+			pos += 2
+		case '"':
+			buf[pos] = '\\'
+			buf[pos+1] = '"'
+			pos += 2
+		case '\\':
+			buf[pos] = '\\'
+			buf[pos+1] = '\\'
+			pos += 2
+		default:
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+// escapeBytesQuotes escapes apostrophes in []byte by doubling them up.
+// This escapes the contents of a string by doubling up any apostrophes that
+// it contains. This is used when the NO_BACKSLASH_ESCAPES SQL_MODE is in
+// effect on the server.
+// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L963-L1038
+func escapeBytesQuotes(buf, v []byte) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for _, c := range v {
+		if c == '\'' {
+			buf[pos] = '\''
+			buf[pos+1] = '\''
+			pos += 2
+		} else {
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+// escapeStringQuotes is similar to escapeBytesQuotes but for string.
+func escapeStringQuotes(buf []byte, v string) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for i := 0; i < len(v); i++ {
+		c := v[i]
+		if c == '\'' {
+			buf[pos] = '\''
+			buf[pos+1] = '\''
+			pos += 2
+		} else {
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+/******************************************************************************
+*                               Sync utils                                    *
+******************************************************************************/
+
+// noCopy may be embedded into structs which must not be copied
+// after the first use.
+//
+// See https://github.com/golang/go/issues/8005#issuecomment-190753527
+// for details.
+type noCopy struct{}
+
+// Lock is a no-op used by -copylocks checker from `go vet`.
+func (*noCopy) Lock() {}
+
+// atomicBool is a wrapper around uint32 for usage as a boolean value with
+// atomic access.
+type atomicBool struct {
+	_noCopy noCopy
+	value   uint32
+}
+
+// IsSet returns whether the current boolean value is true
+func (ab *atomicBool) IsSet() bool {
+	return atomic.LoadUint32(&ab.value) > 0
+}
+
+// Set sets the value of the bool regardless of the previous value
+func (ab *atomicBool) Set(value bool) {
+	if value {
+		atomic.StoreUint32(&ab.value, 1)
+	} else {
+		atomic.StoreUint32(&ab.value, 0)
+	}
+}
+
+// TrySet sets the value of the bool and returns whether the value changed
+func (ab *atomicBool) TrySet(value bool) bool {
+	if value {
+		return atomic.SwapUint32(&ab.value, 1) == 0
+	}
+	return atomic.SwapUint32(&ab.value, 0) > 0
+}
+
+// atomicError is a wrapper for atomically accessed error values
+type atomicError struct {
+	_noCopy noCopy
+	value   atomic.Value
+}
+
+// Set sets the error value regardless of the previous value.
+// The value must not be nil
+func (ae *atomicError) Set(value error) {
+	ae.value.Store(value)
+}
+
+// Value returns the current error value
+func (ae *atomicError) Value() error {
+	if v := ae.value.Load(); v != nil {
+		// this will panic if the value doesn't implement the error interface
+		return v.(error)
+	}
+	return nil
+}
+
+func namedValueToValue(named []driver.NamedValue) ([]driver.Value, error) {
+	dargs := make([]driver.Value, len(named))
+	for n, param := range named {
+		if len(param.Name) > 0 {
+			// TODO: support the use of Named Parameters #561
+			return nil, errors.New("mysql: driver does not support the use of Named Parameters")
+		}
+		dargs[n] = param.Value
+	}
+	return dargs, nil
+}
+
+func mapIsolationLevel(level driver.IsolationLevel) (string, error) {
+	switch sql.IsolationLevel(level) {
+	case sql.LevelRepeatableRead:
+		return "REPEATABLE READ", nil
+	case sql.LevelReadCommitted:
+		return "READ COMMITTED", nil
+	case sql.LevelReadUncommitted:
+		return "READ UNCOMMITTED", nil
+	case sql.LevelSerializable:
+		return "SERIALIZABLE", nil
+	default:
+		return "", fmt.Errorf("mysql: unsupported isolation level: %v", level)
+	}
+}

vendor/github.com/golang-migrate/migrate/v4/.dockerignore

@@ -0,0 +1,12 @@
+# Project
+FAQ.md
+README.md
+LICENSE
+.gitignore
+.travis.yml
+CONTRIBUTING.md
+MIGRATIONS.md
+docker-deploy.sh
+
+# Golang
+testing

vendor/github.com/golang-migrate/migrate/v4/.gitignore

@@ -0,0 +1,10 @@
+.DS_Store
+cli/build
+cli/cli
+cli/migrate
+.coverage
+.godoc.pid
+vendor/
+.vscode/
+.idea
+dist/

vendor/github.com/golang-migrate/migrate/v4/.golangci.yml

@@ -0,0 +1,26 @@
+run:
+  # timeout for analysis, e.g. 30s, 5m, default is 1m
+  timeout: 5m
+linters:
+  enable:
+    #- golint
+    - interfacer
+    - unconvert
+    #- dupl
+    - goconst
+    - gofmt
+    - misspell
+    - unparam
+    - nakedret
+    - prealloc
+    #- gosec
+linters-settings:
+  misspell:
+    locale: US
+issues:
+  max-same-issues: 0
+  max-issues-per-linter: 0
+  exclude-use-default: false
+  exclude:
+    # gosec: Duplicated errcheck checks
+    - G104

vendor/github.com/golang-migrate/migrate/v4/.goreleaser.yml

@@ -0,0 +1,102 @@
+project_name: migrate
+before:
+  hooks:
+    - go mod tidy
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - amd64
+      - arm
+      - arm64
+      - 386
+    goarm:
+      - 7
+    main: ./cmd/migrate
+    ldflags:
+      - '-w -s -X main.Version={{ .Version }} -extldflags "static"'
+    flags:
+      - "-tags={{ .Env.DATABASE }} {{ .Env.SOURCE }}"
+      - "-trimpath"
+nfpms:
+  - homepage: "https://github.com/golang-migrate/migrate"
+    maintainer: "dhui@users.noreply.github.com"
+    license: MIT
+    description: "Database migrations"
+    formats:
+      - deb
+    file_name_template: "{{ .ProjectName }}.{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
+dockers:
+  - goos: linux
+    goarch: amd64
+    dockerfile: Dockerfile.github-actions
+    use: buildx
+    ids:
+      - migrate
+    image_templates:
+      - 'migrate/migrate:{{ .Tag }}-amd64'
+    build_flag_templates:
+      - '--label=org.opencontainers.image.created={{ .Date }}'
+      - '--label=org.opencontainers.image.title={{ .ProjectName }}'
+      - '--label=org.opencontainers.image.revision={{ .FullCommit }}'
+      - '--label=org.opencontainers.image.version={{ .Version }}'
+      - "--label=org.opencontainers.image.source={{ .GitURL }}"
+      - "--platform=linux/amd64"
+  - goos: linux
+    goarch: arm64
+    dockerfile: Dockerfile.github-actions
+    use: buildx
+    ids:
+      - migrate
+    image_templates:
+      - 'migrate/migrate:{{ .Tag }}-arm64'
+    build_flag_templates:
+      - '--label=org.opencontainers.image.created={{ .Date }}'
+      - '--label=org.opencontainers.image.title={{ .ProjectName }}'
+      - '--label=org.opencontainers.image.revision={{ .FullCommit }}'
+      - '--label=org.opencontainers.image.version={{ .Version }}'
+      - "--label=org.opencontainers.image.source={{ .GitURL }}"
+      - "--platform=linux/arm64"
+
+docker_manifests:
+- name_template: 'migrate/migrate:{{ .Tag }}'
+  image_templates:
+  - 'migrate/migrate:{{ .Tag }}-amd64'
+  - 'migrate/migrate:{{ .Tag }}-arm64'
+- name_template: 'migrate/migrate:{{ .Major }}'
+  image_templates:
+  - 'migrate/migrate:{{ .Tag }}-amd64'
+  - 'migrate/migrate:{{ .Tag }}-arm64'
+- name_template: 'migrate/migrate:latest'
+  image_templates:
+  - 'migrate/migrate:{{ .Tag }}-amd64'
+  - 'migrate/migrate:{{ .Tag }}-arm64'
+archives:
+  - name_template: "{{ .ProjectName }}.{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
+    format_overrides:
+      - goos: windows
+        format: zip
+checksum:
+  name_template: 'sha256sum.txt'
+release:
+  draft: true
+  prerelease: auto
+source:
+  enabled: true
+  format: zip
+changelog:
+  skip: false
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+      - Merge pull request
+      - Merge branch
+      - go mod tidy
+snapshot:
+  name_template: "{{ .Tag }}-next"

vendor/github.com/golang-migrate/migrate/v4/.travis.yml

@@ -0,0 +1,138 @@
+language: go
+sudo: required
+
+matrix:
+  allow_failures:
+    - go: master
+  include:
+    # Supported versions of Go: https://golang.org/dl/
+    - go: "1.14.x"
+    - go: "1.15.x"
+    - go: master
+
+go_import_path: github.com/golang-migrate/migrate
+
+env:
+  global:
+    - GO111MODULE=on
+    - MIGRATE_TEST_CONTAINER_BOOT_TIMEOUT=60
+    - DOCKER_USERNAME=golangmigrate
+    -   secure: "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"
+
+services:
+  - docker
+
+cache:
+  directories:
+    - $GOPATH/pkg
+
+
+before_install:
+  # Update docker to latest version: https://docs.travis-ci.com/user/docker/#installing-a-newer-docker-version
+  - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+  - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+  - sudo apt-get update
+  - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
+  # Install golangci-lint
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.30.0
+  - echo "TRAVIS_GO_VERSION=${TRAVIS_GO_VERSION}"
+
+install:
+  - go get github.com/mattn/goveralls
+
+script:
+  - golangci-lint run
+  - make test COVERAGE_DIR=/tmp/coverage
+
+after_success:
+  - goveralls -service=travis-ci -coverprofile /tmp/coverage/combined.txt
+  - make list-external-deps > dependency_tree.txt && cat dependency_tree.txt
+  - make build-cli
+  - gem install --no-document fpm
+  - fpm -s dir -t deb -n migrate -v "$(git describe --tags 2>/dev/null | cut -c 2-)" --license MIT -m dhui@users.noreply.github.com --url https://github.com/golang-migrate/migrate --description='Database migrations' -a amd64 -p migrate.$(git describe --tags 2>/dev/null | cut -c 2-).deb --deb-no-default-config-files -f -C cli/build migrate.linux-amd64=/usr/local/bin/migrate
+
+deploy:
+  - provider: releases
+    api_key:
+      secure: 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
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true
+    file:
+      - cli/build/migrate.linux-amd64.tar.gz
+      - cli/build/migrate.linux-armv7.tar.gz
+      - cli/build/migrate.linux-arm64.tar.gz
+      - cli/build/migrate.darwin-amd64.tar.gz
+      - cli/build/migrate.windows-amd64.exe.tar.gz
+      - cli/build/migrate.windows-386.exe.tar.gz
+      - cli/build/sha256sum.txt
+      - dependency_tree.txt
+  - provider: packagecloud
+    repository: migrate
+    username: golang-migrate
+    token:
+      secure: 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
+    dist: ubuntu/xenial
+    package_glob: '*.deb'
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true
+  - provider: packagecloud
+    repository: migrate
+    username: golang-migrate
+    token:
+      secure: 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
+    dist: ubuntu/bionic
+    package_glob: '*.deb'
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true
+  - provider: packagecloud
+    repository: migrate
+    username: golang-migrate
+    token:
+      secure: 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
+    dist: ubuntu/focal
+    package_glob: '*.deb'
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true
+  - provider: packagecloud
+    repository: migrate
+    username: golang-migrate
+    token:
+      secure: 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
+    dist: debian/stretch
+    package_glob: '*.deb'
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true
+  - provider: packagecloud
+    repository: migrate
+    username: golang-migrate
+    token:
+      secure: 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
+    dist: debian/buster
+    package_glob: '*.deb'
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true
+  - provider: script
+    script: ./docker-deploy.sh
+    skip_cleanup: true
+    on:
+      go: "1.15.x"
+      repo: golang-migrate/migrate
+      tags: true

vendor/github.com/golang-migrate/migrate/v4/CONTRIBUTING.md

@@ -0,0 +1,24 @@
+# Development, Testing and Contributing
+
+  1. Make sure you have a running Docker daemon
+     (Install for [MacOS](https://docs.docker.com/docker-for-mac/))
+  1. Use a version of Go that supports [modules](https://golang.org/cmd/go/#hdr-Modules__module_versions__and_more) (e.g. Go 1.11+)
+  1. Fork this repo and `git clone` somewhere to `$GOPATH/src/github.com/golang-migrate/migrate`
+      * Ensure that [Go modules are enabled](https://golang.org/cmd/go/#hdr-Preliminary_module_support) (e.g. your repo path or the `GO111MODULE` environment variable are set correctly)
+  1. Install [golangci-lint](https://github.com/golangci/golangci-lint#install)
+  1. Run the linter: `golangci-lint run`
+  1. Confirm tests are working: `make test-short`
+  1. Write awesome code ...
+  1. `make test` to run all tests against all database versions
+  1. Push code and open Pull Request
+ 
+Some more helpful commands:
+
+  * You can specify which database/ source tests to run:
+    `make test-short SOURCE='file go_bindata' DATABASE='postgres cassandra'`
+  * After `make test`, run `make html-coverage` which opens a shiny test coverage overview.
+  * `make build-cli` builds the CLI in directory `cli/build/`.
+  * `make list-external-deps` lists all external dependencies for each package
+  * `make docs && make open-docs` opens godoc in your browser, `make kill-docs` kills the godoc server.
+    Repeatedly call `make docs` to refresh the server.
+  * Set the `DOCKER_API_VERSION` environment variable to the latest supported version if you get errors regarding the docker client API version being too new.

vendor/github.com/golang-migrate/migrate/v4/Dockerfile

@@ -0,0 +1,26 @@
+FROM golang:1.16-alpine3.13 AS builder
+ARG VERSION
+
+RUN apk add --no-cache git gcc musl-dev make
+
+WORKDIR /go/src/github.com/golang-migrate/migrate
+
+ENV GO111MODULE=on
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . ./
+
+RUN make build-docker
+
+FROM alpine:3.13
+
+RUN apk add --no-cache ca-certificates
+
+COPY --from=builder /go/src/github.com/golang-migrate/migrate/build/migrate.linux-386 /usr/local/bin/migrate
+RUN ln -s /usr/local/bin/migrate /migrate
+
+ENTRYPOINT ["migrate"]
+CMD ["--help"]

vendor/github.com/golang-migrate/migrate/v4/Dockerfile.circleci

@@ -0,0 +1,17 @@
+ARG DOCKER_IMAGE
+FROM $DOCKER_IMAGE
+
+RUN apk add --no-cache git gcc musl-dev make
+
+WORKDIR /go/src/github.com/golang-migrate/migrate
+
+ENV GO111MODULE=on
+ENV COVERAGE_DIR=/tmp/coverage
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . ./
+
+CMD ["make", "test"]

vendor/github.com/golang-migrate/migrate/v4/Dockerfile.github-actions

@@ -0,0 +1,11 @@
+FROM alpine:3.13
+
+RUN apk add --no-cache ca-certificates
+
+COPY migrate /usr/local/bin/migrate
+
+RUN ln -s /usr/local/bin/migrate /usr/bin/migrate
+RUN ln -s /usr/local/bin/migrate /migrate
+
+ENTRYPOINT ["migrate"]
+CMD ["--help"]

vendor/github.com/golang-migrate/migrate/v4/FAQ.md

@@ -0,0 +1,79 @@
+# FAQ
+
+#### How is the code base structured?
+  ```
+  /          package migrate (the heart of everything)
+  /cli       the CLI wrapper
+  /database  database driver and sub directories have the actual driver implementations
+  /source    source driver and sub directories have the actual driver implementations
+  ```
+
+#### Why is there no `source/driver.go:Last()`?
+  It's not needed. And unless the source has a "native" way to read a directory in reversed order,
+  it might be expensive to do a full directory scan in order to get the last element.
+
+#### What is a NilMigration? NilVersion?
+  NilMigration defines a migration without a body. NilVersion is defined as const -1.
+
+#### What is the difference between uint(version) and int(targetVersion)?
+  version refers to an existing migration version coming from a source and therefore can never be negative.
+  targetVersion can either be a version OR represent a NilVersion, which equals -1.
+
+#### What's the difference between Next/Previous and Up/Down?
+  ```
+  1_first_migration.up.extension           next ->  2_second_migration.up.extension      ...
+  1_first_migration.down.extension  <- previous     2_second_migration.down.extension    ...
+  ```
+
+#### Why two separate files (up and down) for a migration?
+  It makes all of our lives easier. No new markup/syntax to learn for users
+  and existing database utility tools continue to work as expected.
+
+#### How many migrations can migrate handle?
+  Whatever the maximum positive signed integer value is for your platform.
+  For 32bit it would be 2,147,483,647 migrations. Migrate only keeps references to
+  the currently run and pre-fetched migrations in memory. Please note that some
+  source drivers need to do build a full "directory" tree first, which puts some
+  heat on the memory consumption.
+
+#### Are the table tests in migrate_test.go bloated?
+  Yes and no. There are duplicate test cases for sure but they don't hurt here. In fact
+  the tests are very visual now and might help new users understand expected behaviors quickly.
+  Migrate from version x to y and y is the last migration? Just check out the test for
+  that particular case and know what's going on instantly.
+
+#### What is Docker being used for?
+  Only for testing. See [testing/docker.go](testing/docker.go)
+
+#### Why not just use docker-compose?
+  It doesn't give us enough runtime control for testing. We want to be able to bring up containers fast
+  and whenever we want, not just once at the beginning of all tests.
+
+#### Can I maintain my driver in my own repository?
+  Yes, technically thats possible. We want to encourage you to contribute your driver to this respository though.
+  The driver's functionality is dictated by migrate's interfaces. That means there should really
+  just be one driver for a database/ source. We want to prevent a future where several drivers doing the exact same thing,
+  just implemented a bit differently, co-exist somewhere on GitHub. If users have to do research first to find the
+  "best" available driver for a database in order to get started, we would have failed as an open source community.
+
+#### Can I mix multiple sources during a batch of migrations?
+  No.
+
+#### What does "dirty" database mean?
+  Before a migration runs, each database sets a dirty flag. Execution stops if a migration fails and the dirty state persists,
+  which prevents attempts to run more migrations on top of a failed migration. You need to manually fix the error
+  and then "force" the expected version.
+
+#### What happens if two programs try and update the database at the same time?
+Database-specific locking features are used by *some* database drivers to prevent multiple instances of migrate from running migrations at the same time
+  the same database at the same time. For example, the MySQL driver uses the `GET_LOCK` function, while the Postgres driver uses
+  the `pg_advisory_lock` function.
+
+#### Do I need to create a table for tracking migration version used?
+No, it is done automatically.
+
+#### Can I use migrate with a non-Go project?
+Yes, you can use the migrate CLI in a non-Go project, but there are probably other libraries/frameworks available that offer better test and deploy integrations in that language/framework.
+
+#### I have got an error `Dirty database version 1. Fix and force version`. What should I do?
+Keep calm and refer to [the getting started docs](GETTING_STARTED.md#forcing-your-database-version).

vendor/github.com/golang-migrate/migrate/v4/GETTING_STARTED.md

@@ -0,0 +1,53 @@
+# Getting started
+Before you start, you should understand the concept of forward/up and reverse/down database migrations.
+
+Configure a database for your application. Make sure that your database driver is supported [here](README.md#databases)
+
+## Create migrations
+Create some migrations using migrate CLI. Here is an example:
+```
+migrate create -ext sql -dir db/migrations -seq create_users_table
+```
+Once you create your files, you should fill them.
+
+**IMPORTANT:** In a project developed by more than one person there is a chance of migrations inconsistency - e.g. two developers can create conflicting migrations, and the developer that created his migration later gets it merged to the repository first.
+Developers and Teams should keep an eye on such cases (especially during code review).
+[Here](https://github.com/golang-migrate/migrate/issues/179#issuecomment-475821264) is the issue summary if you would like to read more.
+
+Consider making your migrations idempotent - we can run the same sql code twice in a row with the same result. This makes our migrations more robust. On the other hand, it causes slightly less control over database schema - e.g. let's say you forgot to drop the table in down migration. You run down migration - the table is still there. When you run up migration again - `CREATE TABLE` would return an error, helping you find an issue in down migration, while `CREATE TABLE IF NOT EXISTS` would not. Use those conditions wisely.
+
+In case you would like to run several commands/queries in one migration, you should wrap them in a transaction (if your database supports it).
+This way if one of commands fails, our database will remain unchanged.
+
+## Run migrations
+Run your migrations through the CLI or your app and check if they applied expected changes.
+Just to give you an idea:
+```
+migrate -database YOUR_DATABASE_URL -path PATH_TO_YOUR_MIGRATIONS up
+```
+
+Just add the code to your app and you're ready to go!
+
+Before commiting your migrations you should run your migrations up, down, and then up again to see if migrations are working properly both ways.
+(e.g. if you created a table in a migration but reverse migration did not delete it, you will encounter an error when running the forward migration again)
+It's also worth checking your migrations in a separate, containerized environment. You can find some tools in the end of this document.
+
+**IMPORTANT:** If you would like to run multiple instances of your app on different machines be sure to use a database that supports locking when running migrations. Otherwise you may encounter issues.
+
+## Forcing your database version
+In case you run a migration that contained an error, migrate will not let you run other migrations on the same database. You will see an error like `Dirty database version 1. Fix and force version`, even when you fix the erred migration. This means your database was marked as 'dirty'.
+You need to investigate the migration error - was your migration applied partially, or was it not applied at all? Once you know, you should force your database to a version reflecting it's real state. You can do so with `force` command:
+```
+migrate -path PATH_TO_YOUR_MIGRATIONS -database YOUR_DATABASE_URL force VERSION
+```
+Once you force the version and your migration was fixed, your database is 'clean' again and you can proceed with your migrations.
+
+For details and example of usage see [this comment](https://github.com/golang-migrate/migrate/issues/282#issuecomment-530743258).
+
+## Further reading:
+- [PostgreSQL tutorial](database/postgres/TUTORIAL.md)
+- [Best practices](MIGRATIONS.md)
+- [FAQ](FAQ.md)
+- Tools for testing your migrations in a container:
+	- https://github.com/dhui/dktest
+	- https://github.com/ory/dockertest

vendor/github.com/golang-migrate/migrate/v4/LICENSE

@@ -0,0 +1,28 @@
+The MIT License (MIT)
+
+Original Work
+Copyright (c) 2016 Matthias Kadenbach
+https://github.com/mattes/migrate
+
+Modified Work
+Copyright (c) 2018 Dale Hui
+https://github.com/golang-migrate/migrate
+
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/github.com/golang-migrate/migrate/v4/MIGRATIONS.md

@@ -0,0 +1,86 @@
+# Migrations
+
+## Migration Filename Format
+
+A single logical migration is represented as two separate migration files, one
+to migrate "up" to the specified version from the previous version, and a second
+to migrate back "down" to the previous version.  These migrations can be provided
+by any one of the supported [migration sources](./README.md#migration-sources).
+
+The ordering and direction of the migration files is determined by the filenames
+used for them.  `migrate` expects the filenames of migrations to have the format:
+
+    {version}_{title}.up.{extension}
+    {version}_{title}.down.{extension}
+
+The `title` of each migration is unused, and is only for readability.  Similarly,
+the `extension` of the migration files is not checked by the library, and should
+be an appropriate format for the database in use (`.sql` for SQL variants, for
+instance).
+
+Versions of migrations may be represented as any 64 bit unsigned integer.
+All migrations are applied upward in order of increasing version number, and
+downward by decreasing version number.
+
+Common versioning schemes include incrementing integers:
+
+    1_initialize_schema.down.sql
+    1_initialize_schema.up.sql
+    2_add_table.down.sql
+    2_add_table.up.sql
+    ...
+
+Or timestamps at an appropriate resolution:
+
+    1500360784_initialize_schema.down.sql
+    1500360784_initialize_schema.up.sql
+    1500445949_add_table.down.sql
+    1500445949_add_table.up.sql
+    ...
+
+But any scheme resulting in distinct, incrementing integers as versions is valid.
+
+It is suggested that the version number of corresponding `up` and `down` migration
+files be equivalent for clarity, but they are allowed to differ so long as the
+relative ordering of the migrations is preserved.
+
+The migration files are permitted to be "empty", in the event that a migration
+is a no-op or is irreversible. It is recommended to still include both migration
+files by making the whole migration file consist of a comment.
+If your database does not support comments, then deleting the migration file will also work.
+Note, an actual empty file (e.g. a 0 byte file) may cause issues with your database since migrate
+will attempt to run an empty query. In this case, deleting the migration file will also work.
+For the rational of this behavior see:
+[#244 (comment)](https://github.com/golang-migrate/migrate/issues/244#issuecomment-510758270)
+
+## Migration Content Format
+
+The format of the migration files themselves varies between database systems.
+Different databases have different semantics around schema changes and when and
+how they are allowed to occur
+(for instance, [if schema changes can occur within a transaction](https://wiki.postgresql.org/wiki/Transactional_DDL_in_PostgreSQL:_A_Competitive_Analysis)).
+
+As such, the `migrate` library has little to no checking around the format of
+migration sources.  The migration files are generally processed directly by the
+drivers as raw operations.
+
+## Reversibility of Migrations
+
+Best practice for writing schema migration is that all migrations should be
+reversible.  It should in theory be possible for run migrations down and back up
+through any and all versions with the state being fully cleaned and recreated
+by doing so.
+
+By adhering to this recommended practice, development and deployment of new code
+is cleaner and easier (cleaning database state for a new feature should be as
+easy as migrating down to a prior version, and back up to the latest).
+
+As opposed to some other migration libraries, `migrate` represents up and down
+migrations as separate files.  This prevents any non-standard file syntax from
+being introduced which may result in unintended behavior or errors, depending
+on what database is processing the file.
+
+While it is technically possible for an up or down migration to exist on its own
+without an equivalently versioned counterpart, it is strongly recommended to
+always include a down migration which cleans up the state of the corresponding
+up migration.

vendor/github.com/golang-migrate/migrate/v4/Makefile

@@ -0,0 +1,120 @@
+SOURCE ?= file go_bindata github github_ee bitbucket aws_s3 google_cloud_storage godoc_vfs gitlab
+DATABASE ?= postgres mysql redshift cassandra spanner cockroachdb clickhouse mongodb sqlserver firebird neo4j pgx
+DATABASE_TEST ?= $(DATABASE) sqlite sqlite3 sqlcipher
+VERSION ?= $(shell git describe --tags 2>/dev/null | cut -c 2-)
+TEST_FLAGS ?=
+REPO_OWNER ?= $(shell cd .. && basename "$$(pwd)")
+COVERAGE_DIR ?= .coverage
+
+build:
+	CGO_ENABLED=0 go build -ldflags='-X main.Version=$(VERSION)' -tags '$(DATABASE) $(SOURCE)' ./cmd/migrate
+
+build-docker:
+	CGO_ENABLED=0 go build -a -o build/migrate.linux-386 -ldflags="-s -w -X main.Version=${VERSION}" -tags "$(DATABASE) $(SOURCE)" ./cmd/migrate
+
+build-cli: clean
+	-mkdir ./cli/build
+	cd ./cmd/migrate && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o ../../cli/build/migrate.linux-amd64 -ldflags='-X main.Version=$(VERSION) -extldflags "-static"' -tags '$(DATABASE) $(SOURCE)' .
+	cd ./cmd/migrate && CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build -a -o ../../cli/build/migrate.linux-armv7 -ldflags='-X main.Version=$(VERSION) -extldflags "-static"' -tags '$(DATABASE) $(SOURCE)' .
+	cd ./cmd/migrate && CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -a -o ../../cli/build/migrate.linux-arm64 -ldflags='-X main.Version=$(VERSION) -extldflags "-static"' -tags '$(DATABASE) $(SOURCE)' .
+	cd ./cmd/migrate && CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -a -o ../../cli/build/migrate.darwin-amd64 -ldflags='-X main.Version=$(VERSION) -extldflags "-static"' -tags '$(DATABASE) $(SOURCE)' .
+	cd ./cmd/migrate && CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -a -o ../../cli/build/migrate.windows-386.exe -ldflags='-X main.Version=$(VERSION) -extldflags "-static"' -tags '$(DATABASE) $(SOURCE)' .
+	cd ./cmd/migrate && CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -a -o ../../cli/build/migrate.windows-amd64.exe -ldflags='-X main.Version=$(VERSION) -extldflags "-static"' -tags '$(DATABASE) $(SOURCE)' .
+	cd ./cli/build && find . -name 'migrate*' | xargs -I{} tar czf {}.tar.gz {}
+	cd ./cli/build && shasum -a 256 * > sha256sum.txt
+	cat ./cli/build/sha256sum.txt
+
+
+clean:
+	-rm -r ./cli/build
+
+
+test-short:
+	make test-with-flags --ignore-errors TEST_FLAGS='-short'
+
+
+test:
+	@-rm -r $(COVERAGE_DIR)
+	@mkdir $(COVERAGE_DIR)
+	make test-with-flags TEST_FLAGS='-v -race -covermode atomic -coverprofile $$(COVERAGE_DIR)/combined.txt -bench=. -benchmem -timeout 20m'
+
+
+test-with-flags:
+	@echo SOURCE: $(SOURCE)
+	@echo DATABASE_TEST: $(DATABASE_TEST)
+
+	@go test $(TEST_FLAGS) ./...
+
+
+kill-orphaned-docker-containers:
+	docker rm -f $(shell docker ps -aq --filter label=migrate_test)
+
+
+html-coverage:
+	go tool cover -html=$(COVERAGE_DIR)/combined.txt
+
+
+list-external-deps:
+	$(call external_deps,'.')
+	$(call external_deps,'./cli/...')
+	$(call external_deps,'./testing/...')
+
+	$(foreach v, $(SOURCE), $(call external_deps,'./source/$(v)/...'))
+	$(call external_deps,'./source/testing/...')
+	$(call external_deps,'./source/stub/...')
+
+	$(foreach v, $(DATABASE), $(call external_deps,'./database/$(v)/...'))
+	$(call external_deps,'./database/testing/...')
+	$(call external_deps,'./database/stub/...')
+
+
+restore-import-paths:
+	find . -name '*.go' -type f -execdir sed -i '' s%\"github.com/$(REPO_OWNER)/migrate%\"github.com/mattes/migrate%g '{}' \;
+
+
+rewrite-import-paths:
+	find . -name '*.go' -type f -execdir sed -i '' s%\"github.com/mattes/migrate%\"github.com/$(REPO_OWNER)/migrate%g '{}' \;
+
+
+# example: fswatch -0 --exclude .godoc.pid --event Updated . | xargs -0 -n1 -I{} make docs
+docs:
+	-make kill-docs
+	nohup godoc -play -http=127.0.0.1:6064 </dev/null >/dev/null 2>&1 & echo $$! > .godoc.pid
+	cat .godoc.pid
+
+
+kill-docs:
+	@cat .godoc.pid
+	kill -9 $$(cat .godoc.pid)
+	rm .godoc.pid
+
+
+open-docs:
+	open http://localhost:6064/pkg/github.com/$(REPO_OWNER)/migrate
+
+
+# example: make release V=0.0.0
+release:
+	git tag v$(V)
+	@read -p "Press enter to confirm and push to origin ..." && git push origin v$(V)
+
+echo-source:
+	@echo "$(SOURCE)"
+
+echo-database:
+	@echo "$(DATABASE)"
+
+
+define external_deps
+	@echo '-- $(1)';  go list -f '{{join .Deps "\n"}}' $(1) | grep -v github.com/$(REPO_OWNER)/migrate | xargs go list -f '{{if not .Standard}}{{.ImportPath}}{{end}}'
+
+endef
+
+
+.PHONY: build build-docker build-cli clean test-short test test-with-flags html-coverage \
+        restore-import-paths rewrite-import-paths list-external-deps release \
+		docs kill-docs open-docs kill-orphaned-docker-containers echo-source echo-database
+
+SHELL = /bin/sh
+RAND = $(shell echo $$RANDOM)
+

vendor/github.com/golang-migrate/migrate/v4/README.md

@@ -0,0 +1,186 @@
+[![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/golang-migrate/migrate/CI/master)](https://github.com/golang-migrate/migrate/actions/workflows/ci.yaml?query=branch%3Amaster)
+[![GoDoc](https://pkg.go.dev/badge/github.com/golang-migrate/migrate)](https://pkg.go.dev/github.com/golang-migrate/migrate/v4)
+[![Coverage Status](https://img.shields.io/coveralls/github/golang-migrate/migrate/master.svg)](https://coveralls.io/github/golang-migrate/migrate?branch=master)
+[![packagecloud.io](https://img.shields.io/badge/deb-packagecloud.io-844fec.svg)](https://packagecloud.io/golang-migrate/migrate?filter=debs)
+[![Docker Pulls](https://img.shields.io/docker/pulls/migrate/migrate.svg)](https://hub.docker.com/r/migrate/migrate/)
+![Supported Go Versions](https://img.shields.io/badge/Go-1.16%2C%201.17-lightgrey.svg)
+[![GitHub Release](https://img.shields.io/github/release/golang-migrate/migrate.svg)](https://github.com/golang-migrate/migrate/releases)
+[![Go Report Card](https://goreportcard.com/badge/github.com/golang-migrate/migrate)](https://goreportcard.com/report/github.com/golang-migrate/migrate)
+
+# migrate
+
+__Database migrations written in Go. Use as [CLI](#cli-usage) or import as [library](#use-in-your-go-project).__
+
+* Migrate reads migrations from [sources](#migration-sources)
+   and applies them in correct order to a [database](#databases).
+* Drivers are "dumb", migrate glues everything together and makes sure the logic is bulletproof.
+   (Keeps the drivers lightweight, too.)
+* Database drivers don't assume things or try to correct user input. When in doubt, fail.
+
+Forked from [mattes/migrate](https://github.com/mattes/migrate)
+
+## Databases
+
+Database drivers run migrations. [Add a new database?](database/driver.go)
+
+* [PostgreSQL](database/postgres)
+* [PGX](database/pgx)
+* [Redshift](database/redshift)
+* [Ql](database/ql)
+* [Cassandra](database/cassandra)
+* [SQLite](database/sqlite)
+* [SQLite3](database/sqlite3) ([todo #165](https://github.com/mattes/migrate/issues/165))
+* [SQLCipher](database/sqlcipher)
+* [MySQL/ MariaDB](database/mysql)
+* [Neo4j](database/neo4j)
+* [MongoDB](database/mongodb)
+* [CrateDB](database/crate) ([todo #170](https://github.com/mattes/migrate/issues/170))
+* [Shell](database/shell) ([todo #171](https://github.com/mattes/migrate/issues/171))
+* [Google Cloud Spanner](database/spanner)
+* [CockroachDB](database/cockroachdb)
+* [ClickHouse](database/clickhouse)
+* [Firebird](database/firebird)
+* [MS SQL Server](database/sqlserver)
+
+### Database URLs
+
+Database connection strings are specified via URLs. The URL format is driver dependent but generally has the form: `dbdriver://username:password@host:port/dbname?param1=true&param2=false`
+
+Any [reserved URL characters](https://en.wikipedia.org/wiki/Percent-encoding#Percent-encoding_reserved_characters) need to be escaped. Note, the `%` character also [needs to be escaped](https://en.wikipedia.org/wiki/Percent-encoding#Percent-encoding_the_percent_character)
+
+Explicitly, the following characters need to be escaped:
+`!`, `#`, `$`, `%`, `&`, `'`, `(`, `)`, `*`, `+`, `,`, `/`, `:`, `;`, `=`, `?`, `@`, `[`, `]`
+
+It's easiest to always run the URL parts of your DB connection URL (e.g. username, password, etc) through an URL encoder. See the example Python snippets below:
+
+```bash
+$ python3 -c 'import urllib.parse; print(urllib.parse.quote(input("String to encode: "), ""))'
+String to encode: FAKEpassword!#$%&'()*+,/:;=?@[]
+FAKEpassword%21%23%24%25%26%27%28%29%2A%2B%2C%2F%3A%3B%3D%3F%40%5B%5D
+$ python2 -c 'import urllib; print urllib.quote(raw_input("String to encode: "), "")'
+String to encode: FAKEpassword!#$%&'()*+,/:;=?@[]
+FAKEpassword%21%23%24%25%26%27%28%29%2A%2B%2C%2F%3A%3B%3D%3F%40%5B%5D
+$
+```
+
+## Migration Sources
+
+Source drivers read migrations from local or remote sources. [Add a new source?](source/driver.go)
+
+* [Filesystem](source/file) - read from filesystem
+* [Go-Bindata](source/go_bindata) - read from embedded binary data ([jteeuwen/go-bindata](https://github.com/jteeuwen/go-bindata))
+* [GitHub](source/github) - read from remote GitHub repositories
+* [GitHub Enterprise](source/github_ee) - read from remote GitHub Enterprise repositories
+* [Bitbucket](source/bitbucket) - read from remote Bitbucket repositories
+* [Gitlab](source/gitlab) - read from remote Gitlab repositories
+* [AWS S3](source/aws_s3) - read from Amazon Web Services S3
+* [Google Cloud Storage](source/google_cloud_storage) - read from Google Cloud Platform Storage
+
+## CLI usage
+
+* Simple wrapper around this library.
+* Handles ctrl+c (SIGINT) gracefully.
+* No config search paths, no config files, no magic ENV var injections.
+
+__[CLI Documentation](cmd/migrate)__
+
+### Basic usage
+
+```bash
+$ migrate -source file://path/to/migrations -database postgres://localhost:5432/database up 2
+```
+
+### Docker usage
+
+```bash
+$ docker run -v {{ migration dir }}:/migrations --network host migrate/migrate
+    -path=/migrations/ -database postgres://localhost:5432/database up 2
+```
+
+## Use in your Go project
+
+* API is stable and frozen for this release (v3 & v4).
+* Uses [Go modules](https://golang.org/cmd/go/#hdr-Modules__module_versions__and_more) to manage dependencies.
+* To help prevent database corruptions, it supports graceful stops via `GracefulStop chan bool`.
+* Bring your own logger.
+* Uses `io.Reader` streams internally for low memory overhead.
+* Thread-safe and no goroutine leaks.
+
+__[Go Documentation](https://godoc.org/github.com/golang-migrate/migrate)__
+
+```go
+import (
+    "github.com/golang-migrate/migrate/v4"
+    _ "github.com/golang-migrate/migrate/v4/database/postgres"
+    _ "github.com/golang-migrate/migrate/v4/source/github"
+)
+
+func main() {
+    m, err := migrate.New(
+        "github://mattes:personal-access-token@mattes/migrate_test",
+        "postgres://localhost:5432/database?sslmode=enable")
+    m.Steps(2)
+}
+```
+
+Want to use an existing database client?
+
+```go
+import (
+    "database/sql"
+    _ "github.com/lib/pq"
+    "github.com/golang-migrate/migrate/v4"
+    "github.com/golang-migrate/migrate/v4/database/postgres"
+    _ "github.com/golang-migrate/migrate/v4/source/file"
+)
+
+func main() {
+    db, err := sql.Open("postgres", "postgres://localhost:5432/database?sslmode=enable")
+    driver, err := postgres.WithInstance(db, &postgres.Config{})
+    m, err := migrate.NewWithDatabaseInstance(
+        "file:///migrations",
+        "postgres", driver)
+    m.Steps(2)
+}
+```
+
+## Getting started
+
+Go to [getting started](GETTING_STARTED.md)
+
+## Tutorials
+
+* [CockroachDB](database/cockroachdb/TUTORIAL.md)
+* [PostgreSQL](database/postgres/TUTORIAL.md)
+
+(more tutorials to come)
+
+## Migration files
+
+Each migration has an up and down migration. [Why?](FAQ.md#why-two-separate-files-up-and-down-for-a-migration)
+
+```bash
+1481574547_create_users_table.up.sql
+1481574547_create_users_table.down.sql
+```
+
+[Best practices: How to write migrations.](MIGRATIONS.md)
+
+## Versions
+
+Version | Supported? | Import | Notes
+--------|------------|--------|------
+**master** | :white_check_mark: | `import "github.com/golang-migrate/migrate/v4"` | New features and bug fixes arrive here first |
+**v4** | :white_check_mark: | `import "github.com/golang-migrate/migrate/v4"` | Used for stable releases |
+**v3** | :x: | `import "github.com/golang-migrate/migrate"` (with package manager) or `import "gopkg.in/golang-migrate/migrate.v3"` (not recommended) | **DO NOT USE** - No longer supported |
+
+## Development and Contributing
+
+Yes, please! [`Makefile`](Makefile) is your friend,
+read the [development guide](CONTRIBUTING.md).
+
+Also have a look at the [FAQ](FAQ.md).
+
+---
+
+Looking for alternatives? [https://awesome-go.com/#database](https://awesome-go.com/#database).

vendor/github.com/golang-migrate/migrate/v4/database/driver.go

@@ -0,0 +1,123 @@
+// Package database provides the Database interface.
+// All database drivers must implement this interface, register themselves,
+// optionally provide a `WithInstance` function and pass the tests
+// in package database/testing.
+package database
+
+import (
+	"fmt"
+	"io"
+	"sync"
+
+	iurl "github.com/golang-migrate/migrate/v4/internal/url"
+)
+
+var (
+	ErrLocked    = fmt.Errorf("can't acquire lock")
+	ErrNotLocked = fmt.Errorf("can't unlock, as not currently locked")
+)
+
+const NilVersion int = -1
+
+var driversMu sync.RWMutex
+var drivers = make(map[string]Driver)
+
+// Driver is the interface every database driver must implement.
+//
+// How to implement a database driver?
+//   1. Implement this interface.
+//   2. Optionally, add a function named `WithInstance`.
+//      This function should accept an existing DB instance and a Config{} struct
+//      and return a driver instance.
+//   3. Add a test that calls database/testing.go:Test()
+//   4. Add own tests for Open(), WithInstance() (when provided) and Close().
+//      All other functions are tested by tests in database/testing.
+//      Saves you some time and makes sure all database drivers behave the same way.
+//   5. Call Register in init().
+//   6. Create a internal/cli/build_<driver-name>.go file
+//   7. Add driver name in 'DATABASE' variable in Makefile
+//
+// Guidelines:
+//   * Don't try to correct user input. Don't assume things.
+//     When in doubt, return an error and explain the situation to the user.
+//   * All configuration input must come from the URL string in func Open()
+//     or the Config{} struct in WithInstance. Don't os.Getenv().
+type Driver interface {
+	// Open returns a new driver instance configured with parameters
+	// coming from the URL string. Migrate will call this function
+	// only once per instance.
+	Open(url string) (Driver, error)
+
+	// Close closes the underlying database instance managed by the driver.
+	// Migrate will call this function only once per instance.
+	Close() error
+
+	// Lock should acquire a database lock so that only one migration process
+	// can run at a time. Migrate will call this function before Run is called.
+	// If the implementation can't provide this functionality, return nil.
+	// Return database.ErrLocked if database is already locked.
+	Lock() error
+
+	// Unlock should release the lock. Migrate will call this function after
+	// all migrations have been run.
+	Unlock() error
+
+	// Run applies a migration to the database. migration is guaranteed to be not nil.
+	Run(migration io.Reader) error
+
+	// SetVersion saves version and dirty state.
+	// Migrate will call this function before and after each call to Run.
+	// version must be >= -1. -1 means NilVersion.
+	SetVersion(version int, dirty bool) error
+
+	// Version returns the currently active version and if the database is dirty.
+	// When no migration has been applied, it must return version -1.
+	// Dirty means, a previous migration failed and user interaction is required.
+	Version() (version int, dirty bool, err error)
+
+	// Drop deletes everything in the database.
+	// Note that this is a breaking action, a new call to Open() is necessary to
+	// ensure subsequent calls work as expected.
+	Drop() error
+}
+
+// Open returns a new driver instance.
+func Open(url string) (Driver, error) {
+	scheme, err := iurl.SchemeFromURL(url)
+	if err != nil {
+		return nil, err
+	}
+
+	driversMu.RLock()
+	d, ok := drivers[scheme]
+	driversMu.RUnlock()
+	if !ok {
+		return nil, fmt.Errorf("database driver: unknown driver %v (forgotten import?)", scheme)
+	}
+
+	return d.Open(url)
+}
+
+// Register globally registers a driver.
+func Register(name string, driver Driver) {
+	driversMu.Lock()
+	defer driversMu.Unlock()
+	if driver == nil {
+		panic("Register driver is nil")
+	}
+	if _, dup := drivers[name]; dup {
+		panic("Register called twice for driver " + name)
+	}
+	drivers[name] = driver
+}
+
+// List lists the registered drivers
+func List() []string {
+	driversMu.RLock()
+	defer driversMu.RUnlock()
+	names := make([]string, 0, len(drivers))
+	for n := range drivers {
+		names = append(names, n)
+	}
+	return names
+}

vendor/github.com/golang-migrate/migrate/v4/database/error.go

@@ -0,0 +1,27 @@
+package database
+
+import (
+	"fmt"
+)
+
+// Error should be used for errors involving queries ran against the database
+type Error struct {
+	// Optional: the line number
+	Line uint
+
+	// Query is a query excerpt
+	Query []byte
+
+	// Err is a useful/helping error message for humans
+	Err string
+
+	// OrigErr is the underlying error
+	OrigErr error
+}
+
+func (e Error) Error() string {
+	if len(e.Err) == 0 {
+		return fmt.Sprintf("%v in line %v: %s", e.OrigErr, e.Line, e.Query)
+	}
+	return fmt.Sprintf("%v in line %v: %s (details: %v)", e.Err, e.Line, e.Query, e.OrigErr)
+}

vendor/github.com/golang-migrate/migrate/v4/database/mysql/README.md

@@ -0,0 +1,55 @@
+# MySQL
+
+`mysql://user:password@tcp(host:port)/dbname?query`
+
+| URL Query  | WithInstance Config | Description |
+|------------|---------------------|-------------|
+| `x-migrations-table` | `MigrationsTable` | Name of the migrations table |
+| `x-no-lock` | `NoLock` | Set to `true` to skip `GET_LOCK`/`RELEASE_LOCK` statements. Useful for [multi-master MySQL flavors](https://www.percona.com/doc/percona-xtradb-cluster/LATEST/features/pxc-strict-mode.html#explicit-table-locking). Only run migrations from one host when this is enabled. |
+| `dbname` | `DatabaseName` | The name of the database to connect to |
+| `user` | | The user to sign in as |
+| `password` | | The user's password | 
+| `host` | | The host to connect to. |
+| `port` | | The port to bind to. |
+| `tls`  | | TLS / SSL encrypted connection parameter; see [go-sql-driver](https://github.com/go-sql-driver/mysql#tls). Use any name (e.g. `migrate`) if you want to use a custom TLS config (`x-tls-` queries). |
+| `x-tls-ca` | | The location of the CA (certificate authority) file. |
+| `x-tls-cert` | | The location of the client certicicate file. Must be used with `x-tls-key`. |
+| `x-tls-key` | | The location of the private key file. Must be used with `x-tls-cert`. |
+| `x-tls-insecure-skip-verify` | | Whether or not to use SSL (true\|false) | 
+
+## Use with existing client
+
+If you use the MySQL driver with existing database client, you must create the client with parameter `multiStatements=true`:
+
+```go
+package main
+
+import (
+    "database/sql"
+    
+    _ "github.com/go-sql-driver/mysql"
+    "github.com/golang-migrate/migrate"
+    "github.com/golang-migrate/migrate/database/mysql"
+    _ "github.com/golang-migrate/migrate/source/file"
+)
+
+func main() {
+    db, _ := sql.Open("mysql", "user:password@tcp(host:port)/dbname?multiStatements=true")
+    driver, _ := mysql.WithInstance(db, &mysql.Config{})
+    m, _ := migrate.NewWithDatabaseInstance(
+        "file:///migrations",
+        "mysql", 
+        driver,
+    )
+    
+    m.Steps(2)
+}
+```
+
+## Upgrading from v1
+
+1. Write down the current migration version from schema_migrations
+1. `DROP TABLE schema_migrations`
+2. Wrap your existing migrations in transactions ([BEGIN/COMMIT](https://dev.mysql.com/doc/refman/5.7/en/commit.html)) if you use multiple statements within one migration.
+3. Download and install the latest migrate version.
+4. Force the current migration version with `migrate force <current_version>`.

vendor/github.com/golang-migrate/migrate/v4/database/mysql/mysql.go

@@ -0,0 +1,494 @@
+//go:build go1.9
+// +build go1.9
+
+package mysql
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"database/sql"
+	"fmt"
+	"go.uber.org/atomic"
+	"io"
+	"io/ioutil"
+	nurl "net/url"
+	"strconv"
+	"strings"
+
+	"github.com/go-sql-driver/mysql"
+	"github.com/golang-migrate/migrate/v4/database"
+	"github.com/hashicorp/go-multierror"
+)
+
+var _ database.Driver = (*Mysql)(nil) // explicit compile time type check
+
+func init() {
+	database.Register("mysql", &Mysql{})
+}
+
+var DefaultMigrationsTable = "schema_migrations"
+
+var (
+	ErrDatabaseDirty    = fmt.Errorf("database is dirty")
+	ErrNilConfig        = fmt.Errorf("no config")
+	ErrNoDatabaseName   = fmt.Errorf("no database name")
+	ErrAppendPEM        = fmt.Errorf("failed to append PEM")
+	ErrTLSCertKeyConfig = fmt.Errorf("To use TLS client authentication, both x-tls-cert and x-tls-key must not be empty")
+)
+
+type Config struct {
+	MigrationsTable string
+	DatabaseName    string
+	NoLock          bool
+}
+
+type Mysql struct {
+	// mysql RELEASE_LOCK must be called from the same conn, so
+	// just do everything over a single conn anyway.
+	conn     *sql.Conn
+	db       *sql.DB
+	isLocked atomic.Bool
+
+	config *Config
+}
+
+// connection instance must have `multiStatements` set to true
+func WithConnection(ctx context.Context, conn *sql.Conn, config *Config) (*Mysql, error) {
+	if config == nil {
+		return nil, ErrNilConfig
+	}
+
+	if err := conn.PingContext(ctx); err != nil {
+		return nil, err
+	}
+
+	mx := &Mysql{
+		conn:   conn,
+		db:     nil,
+		config: config,
+	}
+
+	if config.DatabaseName == "" {
+		query := `SELECT DATABASE()`
+		var databaseName sql.NullString
+		if err := conn.QueryRowContext(ctx, query).Scan(&databaseName); err != nil {
+			return nil, &database.Error{OrigErr: err, Query: []byte(query)}
+		}
+
+		if len(databaseName.String) == 0 {
+			return nil, ErrNoDatabaseName
+		}
+
+		config.DatabaseName = databaseName.String
+	}
+
+	if len(config.MigrationsTable) == 0 {
+		config.MigrationsTable = DefaultMigrationsTable
+	}
+
+	if err := mx.ensureVersionTable(); err != nil {
+		return nil, err
+	}
+
+	return mx, nil
+}
+
+// instance must have `multiStatements` set to true
+func WithInstance(instance *sql.DB, config *Config) (database.Driver, error) {
+	ctx := context.Background()
+
+	if err := instance.Ping(); err != nil {
+		return nil, err
+	}
+
+	conn, err := instance.Conn(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	mx, err := WithConnection(ctx, conn, config)
+	if err != nil {
+		return nil, err
+	}
+
+	mx.db = instance
+
+	return mx, nil
+}
+
+// extractCustomQueryParams extracts the custom query params (ones that start with "x-") from
+// mysql.Config.Params (connection parameters) as to not interfere with connecting to MySQL
+func extractCustomQueryParams(c *mysql.Config) (map[string]string, error) {
+	if c == nil {
+		return nil, ErrNilConfig
+	}
+	customQueryParams := map[string]string{}
+
+	for k, v := range c.Params {
+		if strings.HasPrefix(k, "x-") {
+			customQueryParams[k] = v
+			delete(c.Params, k)
+		}
+	}
+	return customQueryParams, nil
+}
+
+func urlToMySQLConfig(url string) (*mysql.Config, error) {
+	// Need to parse out custom TLS parameters and call
+	// mysql.RegisterTLSConfig() before mysql.ParseDSN() is called
+	// which consumes the registered tls.Config
+	// Fixes: https://github.com/golang-migrate/migrate/issues/411
+	//
+	// Can't use url.Parse() since it fails to parse MySQL DSNs
+	// mysql.ParseDSN() also searches for "?" to find query parameters:
+	// https://github.com/go-sql-driver/mysql/blob/46351a8/dsn.go#L344
+	if idx := strings.LastIndex(url, "?"); idx > 0 {
+		rawParams := url[idx+1:]
+		parsedParams, err := nurl.ParseQuery(rawParams)
+		if err != nil {
+			return nil, err
+		}
+
+		ctls := parsedParams.Get("tls")
+		if len(ctls) > 0 {
+			if _, isBool := readBool(ctls); !isBool && strings.ToLower(ctls) != "skip-verify" {
+				rootCertPool := x509.NewCertPool()
+				pem, err := ioutil.ReadFile(parsedParams.Get("x-tls-ca"))
+				if err != nil {
+					return nil, err
+				}
+
+				if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
+					return nil, ErrAppendPEM
+				}
+
+				clientCert := make([]tls.Certificate, 0, 1)
+				if ccert, ckey := parsedParams.Get("x-tls-cert"), parsedParams.Get("x-tls-key"); ccert != "" || ckey != "" {
+					if ccert == "" || ckey == "" {
+						return nil, ErrTLSCertKeyConfig
+					}
+					certs, err := tls.LoadX509KeyPair(ccert, ckey)
+					if err != nil {
+						return nil, err
+					}
+					clientCert = append(clientCert, certs)
+				}
+
+				insecureSkipVerify := false
+				insecureSkipVerifyStr := parsedParams.Get("x-tls-insecure-skip-verify")
+				if len(insecureSkipVerifyStr) > 0 {
+					x, err := strconv.ParseBool(insecureSkipVerifyStr)
+					if err != nil {
+						return nil, err
+					}
+					insecureSkipVerify = x
+				}
+
+				err = mysql.RegisterTLSConfig(ctls, &tls.Config{
+					RootCAs:            rootCertPool,
+					Certificates:       clientCert,
+					InsecureSkipVerify: insecureSkipVerify,
+				})
+				if err != nil {
+					return nil, err
+				}
+			}
+		}
+	}
+
+	config, err := mysql.ParseDSN(strings.TrimPrefix(url, "mysql://"))
+	if err != nil {
+		return nil, err
+	}
+
+	config.MultiStatements = true
+
+	// Keep backwards compatibility from when we used net/url.Parse() to parse the DSN.
+	// net/url.Parse() would automatically unescape it for us.
+	// See: https://play.golang.org/p/q9j1io-YICQ
+	user, err := nurl.QueryUnescape(config.User)
+	if err != nil {
+		return nil, err
+	}
+	config.User = user
+
+	password, err := nurl.QueryUnescape(config.Passwd)
+	if err != nil {
+		return nil, err
+	}
+	config.Passwd = password
+
+	return config, nil
+}
+
+func (m *Mysql) Open(url string) (database.Driver, error) {
+	config, err := urlToMySQLConfig(url)
+	if err != nil {
+		return nil, err
+	}
+
+	customParams, err := extractCustomQueryParams(config)
+	if err != nil {
+		return nil, err
+	}
+
+	noLockParam, noLock := customParams["x-no-lock"], false
+	if noLockParam != "" {
+		noLock, err = strconv.ParseBool(noLockParam)
+		if err != nil {
+			return nil, fmt.Errorf("could not parse x-no-lock as bool: %w", err)
+		}
+	}
+
+	db, err := sql.Open("mysql", config.FormatDSN())
+	if err != nil {
+		return nil, err
+	}
+
+	mx, err := WithInstance(db, &Config{
+		DatabaseName:    config.DBName,
+		MigrationsTable: customParams["x-migrations-table"],
+		NoLock:          noLock,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return mx, nil
+}
+
+func (m *Mysql) Close() error {
+	connErr := m.conn.Close()
+	var dbErr error
+	if m.db != nil {
+		dbErr = m.db.Close()
+	}
+
+	if connErr != nil || dbErr != nil {
+		return fmt.Errorf("conn: %v, db: %v", connErr, dbErr)
+	}
+	return nil
+}
+
+func (m *Mysql) Lock() error {
+	return database.CasRestoreOnErr(&m.isLocked, false, true, database.ErrLocked, func() error {
+		if m.config.NoLock {
+			return nil
+		}
+		aid, err := database.GenerateAdvisoryLockId(
+			fmt.Sprintf("%s:%s", m.config.DatabaseName, m.config.MigrationsTable))
+		if err != nil {
+			return err
+		}
+
+		query := "SELECT GET_LOCK(?, 10)"
+		var success bool
+		if err := m.conn.QueryRowContext(context.Background(), query, aid).Scan(&success); err != nil {
+			return &database.Error{OrigErr: err, Err: "try lock failed", Query: []byte(query)}
+		}
+
+		if !success {
+			return database.ErrLocked
+		}
+
+		return nil
+	})
+}
+
+func (m *Mysql) Unlock() error {
+	return database.CasRestoreOnErr(&m.isLocked, true, false, database.ErrNotLocked, func() error {
+		if m.config.NoLock {
+			return nil
+		}
+
+		aid, err := database.GenerateAdvisoryLockId(
+			fmt.Sprintf("%s:%s", m.config.DatabaseName, m.config.MigrationsTable))
+		if err != nil {
+			return err
+		}
+
+		query := `SELECT RELEASE_LOCK(?)`
+		if _, err := m.conn.ExecContext(context.Background(), query, aid); err != nil {
+			return &database.Error{OrigErr: err, Query: []byte(query)}
+		}
+
+		// NOTE: RELEASE_LOCK could return NULL or (or 0 if the code is changed),
+		// in which case isLocked should be true until the timeout expires -- synchronizing
+		// these states is likely not worth trying to do; reconsider the necessity of isLocked.
+
+		return nil
+	})
+}
+
+func (m *Mysql) Run(migration io.Reader) error {
+	migr, err := ioutil.ReadAll(migration)
+	if err != nil {
+		return err
+	}
+
+	query := string(migr[:])
+	if _, err := m.conn.ExecContext(context.Background(), query); err != nil {
+		return database.Error{OrigErr: err, Err: "migration failed", Query: migr}
+	}
+
+	return nil
+}
+
+func (m *Mysql) SetVersion(version int, dirty bool) error {
+	tx, err := m.conn.BeginTx(context.Background(), &sql.TxOptions{})
+	if err != nil {
+		return &database.Error{OrigErr: err, Err: "transaction start failed"}
+	}
+
+	query := "TRUNCATE `" + m.config.MigrationsTable + "`"
+	if _, err := tx.ExecContext(context.Background(), query); err != nil {
+		if errRollback := tx.Rollback(); errRollback != nil {
+			err = multierror.Append(err, errRollback)
+		}
+		return &database.Error{OrigErr: err, Query: []byte(query)}
+	}
+
+	// Also re-write the schema version for nil dirty versions to prevent
+	// empty schema version for failed down migration on the first migration
+	// See: https://github.com/golang-migrate/migrate/issues/330
+	if version >= 0 || (version == database.NilVersion && dirty) {
+		query := "INSERT INTO `" + m.config.MigrationsTable + "` (version, dirty) VALUES (?, ?)"
+		if _, err := tx.ExecContext(context.Background(), query, version, dirty); err != nil {
+			if errRollback := tx.Rollback(); errRollback != nil {
+				err = multierror.Append(err, errRollback)
+			}
+			return &database.Error{OrigErr: err, Query: []byte(query)}
+		}
+	}
+
+	if err := tx.Commit(); err != nil {
+		return &database.Error{OrigErr: err, Err: "transaction commit failed"}
+	}
+
+	return nil
+}
+
+func (m *Mysql) Version() (version int, dirty bool, err error) {
+	query := "SELECT version, dirty FROM `" + m.config.MigrationsTable + "` LIMIT 1"
+	err = m.conn.QueryRowContext(context.Background(), query).Scan(&version, &dirty)
+	switch {
+	case err == sql.ErrNoRows:
+		return database.NilVersion, false, nil
+
+	case err != nil:
+		if e, ok := err.(*mysql.MySQLError); ok {
+			if e.Number == 0 {
+				return database.NilVersion, false, nil
+			}
+		}
+		return 0, false, &database.Error{OrigErr: err, Query: []byte(query)}
+
+	default:
+		return version, dirty, nil
+	}
+}
+
+func (m *Mysql) Drop() (err error) {
+	// select all tables
+	query := `SHOW TABLES LIKE '%'`
+	tables, err := m.conn.QueryContext(context.Background(), query)
+	if err != nil {
+		return &database.Error{OrigErr: err, Query: []byte(query)}
+	}
+	defer func() {
+		if errClose := tables.Close(); errClose != nil {
+			err = multierror.Append(err, errClose)
+		}
+	}()
+
+	// delete one table after another
+	tableNames := make([]string, 0)
+	for tables.Next() {
+		var tableName string
+		if err := tables.Scan(&tableName); err != nil {
+			return err
+		}
+		if len(tableName) > 0 {
+			tableNames = append(tableNames, tableName)
+		}
+	}
+	if err := tables.Err(); err != nil {
+		return &database.Error{OrigErr: err, Query: []byte(query)}
+	}
+
+	if len(tableNames) > 0 {
+		// disable checking foreign key constraints until finished
+		query = `SET foreign_key_checks = 0`
+		if _, err := m.conn.ExecContext(context.Background(), query); err != nil {
+			return &database.Error{OrigErr: err, Query: []byte(query)}
+		}
+
+		defer func() {
+			// enable foreign key checks
+			_, _ = m.conn.ExecContext(context.Background(), `SET foreign_key_checks = 1`)
+		}()
+
+		// delete one by one ...
+		for _, t := range tableNames {
+			query = "DROP TABLE IF EXISTS `" + t + "`"
+			if _, err := m.conn.ExecContext(context.Background(), query); err != nil {
+				return &database.Error{OrigErr: err, Query: []byte(query)}
+			}
+		}
+	}
+
+	return nil
+}
+
+// ensureVersionTable checks if versions table exists and, if not, creates it.
+// Note that this function locks the database, which deviates from the usual
+// convention of "caller locks" in the Mysql type.
+func (m *Mysql) ensureVersionTable() (err error) {
+	if err = m.Lock(); err != nil {
+		return err
+	}
+
+	defer func() {
+		if e := m.Unlock(); e != nil {
+			if err == nil {
+				err = e
+			} else {
+				err = multierror.Append(err, e)
+			}
+		}
+	}()
+
+	// check if migration table exists
+	var result string
+	query := `SHOW TABLES LIKE '` + m.config.MigrationsTable + `'`
+	if err := m.conn.QueryRowContext(context.Background(), query).Scan(&result); err != nil {
+		if err != sql.ErrNoRows {
+			return &database.Error{OrigErr: err, Query: []byte(query)}
+		}
+	} else {
+		return nil
+	}
+
+	// if not, create the empty migration table
+	query = "CREATE TABLE `" + m.config.MigrationsTable + "` (version bigint not null primary key, dirty boolean not null)"
+	if _, err := m.conn.ExecContext(context.Background(), query); err != nil {
+		return &database.Error{OrigErr: err, Query: []byte(query)}
+	}
+	return nil
+}
+
+// Returns the bool value of the input.
+// The 2nd return value indicates if the input was a valid bool value
+// See https://github.com/go-sql-driver/mysql/blob/a059889267dc7170331388008528b3b44479bffb/utils.go#L71
+func readBool(input string) (value bool, valid bool) {
+	switch input {
+	case "1", "true", "TRUE", "True":
+		return true, true
+	case "0", "false", "FALSE", "False":
+		return false, true
+	}
+
+	// Not a valid bool value
+	return
+}

vendor/github.com/golang-migrate/migrate/v4/database/util.go

@@ -0,0 +1,33 @@
+package database
+
+import (
+	"fmt"
+	"go.uber.org/atomic"
+	"hash/crc32"
+	"strings"
+)
+
+const advisoryLockIDSalt uint = 1486364155
+
+// GenerateAdvisoryLockId inspired by rails migrations, see https://goo.gl/8o9bCT
+func GenerateAdvisoryLockId(databaseName string, additionalNames ...string) (string, error) { // nolint: golint
+	if len(additionalNames) > 0 {
+		databaseName = strings.Join(append(additionalNames, databaseName), "\x00")
+	}
+	sum := crc32.ChecksumIEEE([]byte(databaseName))
+	sum = sum * uint32(advisoryLockIDSalt)
+	return fmt.Sprint(sum), nil
+}
+
+// CasRestoreOnErr CAS wrapper to automatically restore the lock state on error
+func CasRestoreOnErr(lock *atomic.Bool, o, n bool, casErr error, f func() error) error {
+	if !lock.CAS(o, n) {
+		return casErr
+	}
+	if err := f(); err != nil {
+		// Automatically unlock/lock on error
+		lock.Store(o)
+		return err
+	}
+	return nil
+}

vendor/github.com/golang-migrate/migrate/v4/docker-deploy.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin && \
+docker build --build-arg VERSION="$TRAVIS_TAG" . -t migrate/migrate -t migrate/migrate:"$TRAVIS_TAG" && \
+docker push migrate/migrate:"$TRAVIS_TAG" && docker push migrate/migrate

vendor/github.com/golang-migrate/migrate/v4/internal/url/url.go

@@ -0,0 +1,25 @@
+package url
+
+import (
+	"errors"
+	"strings"
+)
+
+var errNoScheme = errors.New("no scheme")
+var errEmptyURL = errors.New("URL cannot be empty")
+
+// schemeFromURL returns the scheme from a URL string
+func SchemeFromURL(url string) (string, error) {
+	if url == "" {
+		return "", errEmptyURL
+	}
+
+	i := strings.Index(url, ":")
+
+	// No : or : is the first character.
+	if i < 1 {
+		return "", errNoScheme
+	}
+
+	return url[0:i], nil
+}

vendor/github.com/golang-migrate/migrate/v4/log.go

@@ -0,0 +1,12 @@
+package migrate
+
+// Logger is an interface so you can pass in your own
+// logging implementation.
+type Logger interface {
+
+	// Printf is like fmt.Printf
+	Printf(format string, v ...interface{})
+
+	// Verbose should return true when verbose logging output is wanted
+	Verbose() bool
+}

vendor/github.com/golang-migrate/migrate/v4/migrate.go

@@ -0,0 +1,981 @@
+// Package migrate reads migrations from sources and runs them against databases.
+// Sources are defined by the `source.Driver` and databases by the `database.Driver`
+// interface. The driver interfaces are kept "dumb", all migration logic is kept
+// in this package.
+package migrate
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/hashicorp/go-multierror"
+
+	"github.com/golang-migrate/migrate/v4/database"
+	iurl "github.com/golang-migrate/migrate/v4/internal/url"
+	"github.com/golang-migrate/migrate/v4/source"
+)
+
+// DefaultPrefetchMigrations sets the number of migrations to pre-read
+// from the source. This is helpful if the source is remote, but has little
+// effect for a local source (i.e. file system).
+// Please note that this setting has a major impact on the memory usage,
+// since each pre-read migration is buffered in memory. See DefaultBufferSize.
+var DefaultPrefetchMigrations = uint(10)
+
+// DefaultLockTimeout sets the max time a database driver has to acquire a lock.
+var DefaultLockTimeout = 15 * time.Second
+
+var (
+	ErrNoChange       = errors.New("no change")
+	ErrNilVersion     = errors.New("no migration")
+	ErrInvalidVersion = errors.New("version must be >= -1")
+	ErrLocked         = errors.New("database locked")
+	ErrLockTimeout    = errors.New("timeout: can't acquire database lock")
+)
+
+// ErrShortLimit is an error returned when not enough migrations
+// can be returned by a source for a given limit.
+type ErrShortLimit struct {
+	Short uint
+}
+
+// Error implements the error interface.
+func (e ErrShortLimit) Error() string {
+	return fmt.Sprintf("limit %v short", e.Short)
+}
+
+type ErrDirty struct {
+	Version int
+}
+
+func (e ErrDirty) Error() string {
+	return fmt.Sprintf("Dirty database version %v. Fix and force version.", e.Version)
+}
+
+type Migrate struct {
+	sourceName   string
+	sourceDrv    source.Driver
+	databaseName string
+	databaseDrv  database.Driver
+
+	// Log accepts a Logger interface
+	Log Logger
+
+	// GracefulStop accepts `true` and will stop executing migrations
+	// as soon as possible at a safe break point, so that the database
+	// is not corrupted.
+	GracefulStop chan bool
+	isLockedMu   *sync.Mutex
+
+	isGracefulStop bool
+	isLocked       bool
+
+	// PrefetchMigrations defaults to DefaultPrefetchMigrations,
+	// but can be set per Migrate instance.
+	PrefetchMigrations uint
+
+	// LockTimeout defaults to DefaultLockTimeout,
+	// but can be set per Migrate instance.
+	LockTimeout time.Duration
+}
+
+// New returns a new Migrate instance from a source URL and a database URL.
+// The URL scheme is defined by each driver.
+func New(sourceURL, databaseURL string) (*Migrate, error) {
+	m := newCommon()
+
+	sourceName, err := iurl.SchemeFromURL(sourceURL)
+	if err != nil {
+		return nil, err
+	}
+	m.sourceName = sourceName
+
+	databaseName, err := iurl.SchemeFromURL(databaseURL)
+	if err != nil {
+		return nil, err
+	}
+	m.databaseName = databaseName
+
+	sourceDrv, err := source.Open(sourceURL)
+	if err != nil {
+		return nil, err
+	}
+	m.sourceDrv = sourceDrv
+
+	databaseDrv, err := database.Open(databaseURL)
+	if err != nil {
+		return nil, err
+	}
+	m.databaseDrv = databaseDrv
+
+	return m, nil
+}
+
+// NewWithDatabaseInstance returns a new Migrate instance from a source URL
+// and an existing database instance. The source URL scheme is defined by each driver.
+// Use any string that can serve as an identifier during logging as databaseName.
+// You are responsible for closing the underlying database client if necessary.
+func NewWithDatabaseInstance(sourceURL string, databaseName string, databaseInstance database.Driver) (*Migrate, error) {
+	m := newCommon()
+
+	sourceName, err := iurl.SchemeFromURL(sourceURL)
+	if err != nil {
+		return nil, err
+	}
+	m.sourceName = sourceName
+
+	m.databaseName = databaseName
+
+	sourceDrv, err := source.Open(sourceURL)
+	if err != nil {
+		return nil, err
+	}
+	m.sourceDrv = sourceDrv
+
+	m.databaseDrv = databaseInstance
+
+	return m, nil
+}
+
+// NewWithSourceInstance returns a new Migrate instance from an existing source instance
+// and a database URL. The database URL scheme is defined by each driver.
+// Use any string that can serve as an identifier during logging as sourceName.
+// You are responsible for closing the underlying source client if necessary.
+func NewWithSourceInstance(sourceName string, sourceInstance source.Driver, databaseURL string) (*Migrate, error) {
+	m := newCommon()
+
+	databaseName, err := iurl.SchemeFromURL(databaseURL)
+	if err != nil {
+		return nil, err
+	}
+	m.databaseName = databaseName
+
+	m.sourceName = sourceName
+
+	databaseDrv, err := database.Open(databaseURL)
+	if err != nil {
+		return nil, err
+	}
+	m.databaseDrv = databaseDrv
+
+	m.sourceDrv = sourceInstance
+
+	return m, nil
+}
+
+// NewWithInstance returns a new Migrate instance from an existing source and
+// database instance. Use any string that can serve as an identifier during logging
+// as sourceName and databaseName. You are responsible for closing down
+// the underlying source and database client if necessary.
+func NewWithInstance(sourceName string, sourceInstance source.Driver, databaseName string, databaseInstance database.Driver) (*Migrate, error) {
+	m := newCommon()
+
+	m.sourceName = sourceName
+	m.databaseName = databaseName
+
+	m.sourceDrv = sourceInstance
+	m.databaseDrv = databaseInstance
+
+	return m, nil
+}
+
+func newCommon() *Migrate {
+	return &Migrate{
+		GracefulStop:       make(chan bool, 1),
+		PrefetchMigrations: DefaultPrefetchMigrations,
+		LockTimeout:        DefaultLockTimeout,
+		isLockedMu:         &sync.Mutex{},
+	}
+}
+
+// Close closes the source and the database.
+func (m *Migrate) Close() (source error, database error) {
+	databaseSrvClose := make(chan error)
+	sourceSrvClose := make(chan error)
+
+	m.logVerbosePrintf("Closing source and database\n")
+
+	go func() {
+		databaseSrvClose <- m.databaseDrv.Close()
+	}()
+
+	go func() {
+		sourceSrvClose <- m.sourceDrv.Close()
+	}()
+
+	return <-sourceSrvClose, <-databaseSrvClose
+}
+
+// Migrate looks at the currently active migration version,
+// then migrates either up or down to the specified version.
+func (m *Migrate) Migrate(version uint) error {
+	if err := m.lock(); err != nil {
+		return err
+	}
+
+	curVersion, dirty, err := m.databaseDrv.Version()
+	if err != nil {
+		return m.unlockErr(err)
+	}
+
+	if dirty {
+		return m.unlockErr(ErrDirty{curVersion})
+	}
+
+	ret := make(chan interface{}, m.PrefetchMigrations)
+	go m.read(curVersion, int(version), ret)
+
+	return m.unlockErr(m.runMigrations(ret))
+}
+
+// Steps looks at the currently active migration version.
+// It will migrate up if n > 0, and down if n < 0.
+func (m *Migrate) Steps(n int) error {
+	if n == 0 {
+		return ErrNoChange
+	}
+
+	if err := m.lock(); err != nil {
+		return err
+	}
+
+	curVersion, dirty, err := m.databaseDrv.Version()
+	if err != nil {
+		return m.unlockErr(err)
+	}
+
+	if dirty {
+		return m.unlockErr(ErrDirty{curVersion})
+	}
+
+	ret := make(chan interface{}, m.PrefetchMigrations)
+
+	if n > 0 {
+		go m.readUp(curVersion, n, ret)
+	} else {
+		go m.readDown(curVersion, -n, ret)
+	}
+
+	return m.unlockErr(m.runMigrations(ret))
+}
+
+// Up looks at the currently active migration version
+// and will migrate all the way up (applying all up migrations).
+func (m *Migrate) Up() error {
+	if err := m.lock(); err != nil {
+		return err
+	}
+
+	curVersion, dirty, err := m.databaseDrv.Version()
+	if err != nil {
+		return m.unlockErr(err)
+	}
+
+	if dirty {
+		return m.unlockErr(ErrDirty{curVersion})
+	}
+
+	ret := make(chan interface{}, m.PrefetchMigrations)
+
+	go m.readUp(curVersion, -1, ret)
+	return m.unlockErr(m.runMigrations(ret))
+}
+
+// Down looks at the currently active migration version
+// and will migrate all the way down (applying all down migrations).
+func (m *Migrate) Down() error {
+	if err := m.lock(); err != nil {
+		return err
+	}
+
+	curVersion, dirty, err := m.databaseDrv.Version()
+	if err != nil {
+		return m.unlockErr(err)
+	}
+
+	if dirty {
+		return m.unlockErr(ErrDirty{curVersion})
+	}
+
+	ret := make(chan interface{}, m.PrefetchMigrations)
+	go m.readDown(curVersion, -1, ret)
+	return m.unlockErr(m.runMigrations(ret))
+}
+
+// Drop deletes everything in the database.
+func (m *Migrate) Drop() error {
+	if err := m.lock(); err != nil {
+		return err
+	}
+	if err := m.databaseDrv.Drop(); err != nil {
+		return m.unlockErr(err)
+	}
+	return m.unlock()
+}
+
+// Run runs any migration provided by you against the database.
+// It does not check any currently active version in database.
+// Usually you don't need this function at all. Use Migrate,
+// Steps, Up or Down instead.
+func (m *Migrate) Run(migration ...*Migration) error {
+	if len(migration) == 0 {
+		return ErrNoChange
+	}
+
+	if err := m.lock(); err != nil {
+		return err
+	}
+
+	curVersion, dirty, err := m.databaseDrv.Version()
+	if err != nil {
+		return m.unlockErr(err)
+	}
+
+	if dirty {
+		return m.unlockErr(ErrDirty{curVersion})
+	}
+
+	ret := make(chan interface{}, m.PrefetchMigrations)
+
+	go func() {
+		defer close(ret)
+		for _, migr := range migration {
+			if m.PrefetchMigrations > 0 && migr.Body != nil {
+				m.logVerbosePrintf("Start buffering %v\n", migr.LogString())
+			} else {
+				m.logVerbosePrintf("Scheduled %v\n", migr.LogString())
+			}
+
+			ret <- migr
+			go func(migr *Migration) {
+				if err := migr.Buffer(); err != nil {
+					m.logErr(err)
+				}
+			}(migr)
+		}
+	}()
+
+	return m.unlockErr(m.runMigrations(ret))
+}
+
+// Force sets a migration version.
+// It does not check any currently active version in database.
+// It resets the dirty state to false.
+func (m *Migrate) Force(version int) error {
+	if version < -1 {
+		return ErrInvalidVersion
+	}
+
+	if err := m.lock(); err != nil {
+		return err
+	}
+
+	if err := m.databaseDrv.SetVersion(version, false); err != nil {
+		return m.unlockErr(err)
+	}
+
+	return m.unlock()
+}
+
+// Version returns the currently active migration version.
+// If no migration has been applied, yet, it will return ErrNilVersion.
+func (m *Migrate) Version() (version uint, dirty bool, err error) {
+	v, d, err := m.databaseDrv.Version()
+	if err != nil {
+		return 0, false, err
+	}
+
+	if v == database.NilVersion {
+		return 0, false, ErrNilVersion
+	}
+
+	return suint(v), d, nil
+}
+
+// read reads either up or down migrations from source `from` to `to`.
+// Each migration is then written to the ret channel.
+// If an error occurs during reading, that error is written to the ret channel, too.
+// Once read is done reading it will close the ret channel.
+func (m *Migrate) read(from int, to int, ret chan<- interface{}) {
+	defer close(ret)
+
+	// check if from version exists
+	if from >= 0 {
+		if err := m.versionExists(suint(from)); err != nil {
+			ret <- err
+			return
+		}
+	}
+
+	// check if to version exists
+	if to >= 0 {
+		if err := m.versionExists(suint(to)); err != nil {
+			ret <- err
+			return
+		}
+	}
+
+	// no change?
+	if from == to {
+		ret <- ErrNoChange
+		return
+	}
+
+	if from < to {
+		// it's going up
+		// apply first migration if from is nil version
+		if from == -1 {
+			firstVersion, err := m.sourceDrv.First()
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			migr, err := m.newMigration(firstVersion, int(firstVersion))
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			ret <- migr
+			go func() {
+				if err := migr.Buffer(); err != nil {
+					m.logErr(err)
+				}
+			}()
+
+			from = int(firstVersion)
+		}
+
+		// run until we reach target ...
+		for from < to {
+			if m.stop() {
+				return
+			}
+
+			next, err := m.sourceDrv.Next(suint(from))
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			migr, err := m.newMigration(next, int(next))
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			ret <- migr
+			go func() {
+				if err := migr.Buffer(); err != nil {
+					m.logErr(err)
+				}
+			}()
+
+			from = int(next)
+		}
+
+	} else {
+		// it's going down
+		// run until we reach target ...
+		for from > to && from >= 0 {
+			if m.stop() {
+				return
+			}
+
+			prev, err := m.sourceDrv.Prev(suint(from))
+			if errors.Is(err, os.ErrNotExist) && to == -1 {
+				// apply nil migration
+				migr, err := m.newMigration(suint(from), -1)
+				if err != nil {
+					ret <- err
+					return
+				}
+				ret <- migr
+				go func() {
+					if err := migr.Buffer(); err != nil {
+						m.logErr(err)
+					}
+				}()
+
+				return
+
+			} else if err != nil {
+				ret <- err
+				return
+			}
+
+			migr, err := m.newMigration(suint(from), int(prev))
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			ret <- migr
+			go func() {
+				if err := migr.Buffer(); err != nil {
+					m.logErr(err)
+				}
+			}()
+
+			from = int(prev)
+		}
+	}
+}
+
+// readUp reads up migrations from `from` limitted by `limit`.
+// limit can be -1, implying no limit and reading until there are no more migrations.
+// Each migration is then written to the ret channel.
+// If an error occurs during reading, that error is written to the ret channel, too.
+// Once readUp is done reading it will close the ret channel.
+func (m *Migrate) readUp(from int, limit int, ret chan<- interface{}) {
+	defer close(ret)
+
+	// check if from version exists
+	if from >= 0 {
+		if err := m.versionExists(suint(from)); err != nil {
+			ret <- err
+			return
+		}
+	}
+
+	if limit == 0 {
+		ret <- ErrNoChange
+		return
+	}
+
+	count := 0
+	for count < limit || limit == -1 {
+		if m.stop() {
+			return
+		}
+
+		// apply first migration if from is nil version
+		if from == -1 {
+			firstVersion, err := m.sourceDrv.First()
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			migr, err := m.newMigration(firstVersion, int(firstVersion))
+			if err != nil {
+				ret <- err
+				return
+			}
+
+			ret <- migr
+			go func() {
+				if err := migr.Buffer(); err != nil {
+					m.logErr(err)
+				}
+			}()
+			from = int(firstVersion)
+			count++
+			continue
+		}
+
+		// apply next migration
+		next, err := m.sourceDrv.Next(suint(from))
+		if errors.Is(err, os.ErrNotExist) {
+			// no limit, but no migrations applied?
+			if limit == -1 && count == 0 {
+				ret <- ErrNoChange
+				return
+			}
+
+			// no limit, reached end
+			if limit == -1 {
+				return
+			}
+
+			// reached end, and didn't apply any migrations
+			if limit > 0 && count == 0 {
+				ret <- os.ErrNotExist
+				return
+			}
+
+			// applied less migrations than limit?
+			if count < limit {
+				ret <- ErrShortLimit{suint(limit - count)}
+				return
+			}
+		}
+		if err != nil {
+			ret <- err
+			return
+		}
+
+		migr, err := m.newMigration(next, int(next))
+		if err != nil {
+			ret <- err
+			return
+		}
+
+		ret <- migr
+		go func() {
+			if err := migr.Buffer(); err != nil {
+				m.logErr(err)
+			}
+		}()
+		from = int(next)
+		count++
+	}
+}
+
+// readDown reads down migrations from `from` limitted by `limit`.
+// limit can be -1, implying no limit and reading until there are no more migrations.
+// Each migration is then written to the ret channel.
+// If an error occurs during reading, that error is written to the ret channel, too.
+// Once readDown is done reading it will close the ret channel.
+func (m *Migrate) readDown(from int, limit int, ret chan<- interface{}) {
+	defer close(ret)
+
+	// check if from version exists
+	if from >= 0 {
+		if err := m.versionExists(suint(from)); err != nil {
+			ret <- err
+			return
+		}
+	}
+
+	if limit == 0 {
+		ret <- ErrNoChange
+		return
+	}
+
+	// no change if already at nil version
+	if from == -1 && limit == -1 {
+		ret <- ErrNoChange
+		return
+	}
+
+	// can't go over limit if already at nil version
+	if from == -1 && limit > 0 {
+		ret <- os.ErrNotExist
+		return
+	}
+
+	count := 0
+	for count < limit || limit == -1 {
+		if m.stop() {
+			return
+		}
+
+		prev, err := m.sourceDrv.Prev(suint(from))
+		if errors.Is(err, os.ErrNotExist) {
+			// no limit or haven't reached limit, apply "first" migration
+			if limit == -1 || limit-count > 0 {
+				firstVersion, err := m.sourceDrv.First()
+				if err != nil {
+					ret <- err
+					return
+				}
+
+				migr, err := m.newMigration(firstVersion, -1)
+				if err != nil {
+					ret <- err
+					return
+				}
+				ret <- migr
+				go func() {
+					if err := migr.Buffer(); err != nil {
+						m.logErr(err)
+					}
+				}()
+				count++
+			}
+
+			if count < limit {
+				ret <- ErrShortLimit{suint(limit - count)}
+			}
+			return
+		}
+		if err != nil {
+			ret <- err
+			return
+		}
+
+		migr, err := m.newMigration(suint(from), int(prev))
+		if err != nil {
+			ret <- err
+			return
+		}
+
+		ret <- migr
+		go func() {
+			if err := migr.Buffer(); err != nil {
+				m.logErr(err)
+			}
+		}()
+		from = int(prev)
+		count++
+	}
+}
+
+// runMigrations reads *Migration and error from a channel. Any other type
+// sent on this channel will result in a panic. Each migration is then
+// proxied to the database driver and run against the database.
+// Before running a newly received migration it will check if it's supposed
+// to stop execution because it might have received a stop signal on the
+// GracefulStop channel.
+func (m *Migrate) runMigrations(ret <-chan interface{}) error {
+	for r := range ret {
+
+		if m.stop() {
+			return nil
+		}
+
+		switch r := r.(type) {
+		case error:
+			return r
+
+		case *Migration:
+			migr := r
+
+			// set version with dirty state
+			if err := m.databaseDrv.SetVersion(migr.TargetVersion, true); err != nil {
+				return err
+			}
+
+			if migr.Body != nil {
+				m.logVerbosePrintf("Read and execute %v\n", migr.LogString())
+				if err := m.databaseDrv.Run(migr.BufferedBody); err != nil {
+					return err
+				}
+			}
+
+			// set clean state
+			if err := m.databaseDrv.SetVersion(migr.TargetVersion, false); err != nil {
+				return err
+			}
+
+			endTime := time.Now()
+			readTime := migr.FinishedReading.Sub(migr.StartedBuffering)
+			runTime := endTime.Sub(migr.FinishedReading)
+
+			// log either verbose or normal
+			if m.Log != nil {
+				if m.Log.Verbose() {
+					m.logPrintf("Finished %v (read %v, ran %v)\n", migr.LogString(), readTime, runTime)
+				} else {
+					m.logPrintf("%v (%v)\n", migr.LogString(), readTime+runTime)
+				}
+			}
+
+		default:
+			return fmt.Errorf("unknown type: %T with value: %+v", r, r)
+		}
+	}
+	return nil
+}
+
+// versionExists checks the source if either the up or down migration for
+// the specified migration version exists.
+func (m *Migrate) versionExists(version uint) (result error) {
+	// try up migration first
+	up, _, err := m.sourceDrv.ReadUp(version)
+	if err == nil {
+		defer func() {
+			if errClose := up.Close(); errClose != nil {
+				result = multierror.Append(result, errClose)
+			}
+		}()
+	}
+	if errors.Is(err, os.ErrExist) {
+		return nil
+	} else if !errors.Is(err, os.ErrNotExist) {
+		return err
+	}
+
+	// then try down migration
+	down, _, err := m.sourceDrv.ReadDown(version)
+	if err == nil {
+		defer func() {
+			if errClose := down.Close(); errClose != nil {
+				result = multierror.Append(result, errClose)
+			}
+		}()
+	}
+	if errors.Is(err, os.ErrExist) {
+		return nil
+	} else if !errors.Is(err, os.ErrNotExist) {
+		return err
+	}
+
+	err = fmt.Errorf("no migration found for version %d: %w", version, err)
+	m.logErr(err)
+	return err
+}
+
+// stop returns true if no more migrations should be run against the database
+// because a stop signal was received on the GracefulStop channel.
+// Calls are cheap and this function is not blocking.
+func (m *Migrate) stop() bool {
+	if m.isGracefulStop {
+		return true
+	}
+
+	select {
+	case <-m.GracefulStop:
+		m.isGracefulStop = true
+		return true
+
+	default:
+		return false
+	}
+}
+
+// newMigration is a helper func that returns a *Migration for the
+// specified version and targetVersion.
+func (m *Migrate) newMigration(version uint, targetVersion int) (*Migration, error) {
+	var migr *Migration
+
+	if targetVersion >= int(version) {
+		r, identifier, err := m.sourceDrv.ReadUp(version)
+		if errors.Is(err, os.ErrNotExist) {
+			// create "empty" migration
+			migr, err = NewMigration(nil, "", version, targetVersion)
+			if err != nil {
+				return nil, err
+			}
+
+		} else if err != nil {
+			return nil, err
+
+		} else {
+			// create migration from up source
+			migr, err = NewMigration(r, identifier, version, targetVersion)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+	} else {
+		r, identifier, err := m.sourceDrv.ReadDown(version)
+		if errors.Is(err, os.ErrNotExist) {
+			// create "empty" migration
+			migr, err = NewMigration(nil, "", version, targetVersion)
+			if err != nil {
+				return nil, err
+			}
+
+		} else if err != nil {
+			return nil, err
+
+		} else {
+			// create migration from down source
+			migr, err = NewMigration(r, identifier, version, targetVersion)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	if m.PrefetchMigrations > 0 && migr.Body != nil {
+		m.logVerbosePrintf("Start buffering %v\n", migr.LogString())
+	} else {
+		m.logVerbosePrintf("Scheduled %v\n", migr.LogString())
+	}
+
+	return migr, nil
+}
+
+// lock is a thread safe helper function to lock the database.
+// It should be called as late as possible when running migrations.
+func (m *Migrate) lock() error {
+	m.isLockedMu.Lock()
+	defer m.isLockedMu.Unlock()
+
+	if m.isLocked {
+		return ErrLocked
+	}
+
+	// create done channel, used in the timeout goroutine
+	done := make(chan bool, 1)
+	defer func() {
+		done <- true
+	}()
+
+	// use errchan to signal error back to this context
+	errchan := make(chan error, 2)
+
+	// start timeout goroutine
+	timeout := time.After(m.LockTimeout)
+	go func() {
+		for {
+			select {
+			case <-done:
+				return
+			case <-timeout:
+				errchan <- ErrLockTimeout
+				return
+			}
+		}
+	}()
+
+	// now try to acquire the lock
+	go func() {
+		if err := m.databaseDrv.Lock(); err != nil {
+			errchan <- err
+		} else {
+			errchan <- nil
+		}
+	}()
+
+	// wait until we either receive ErrLockTimeout or error from Lock operation
+	err := <-errchan
+	if err == nil {
+		m.isLocked = true
+	}
+	return err
+}
+
+// unlock is a thread safe helper function to unlock the database.
+// It should be called as early as possible when no more migrations are
+// expected to be executed.
+func (m *Migrate) unlock() error {
+	m.isLockedMu.Lock()
+	defer m.isLockedMu.Unlock()
+
+	if err := m.databaseDrv.Unlock(); err != nil {
+		// BUG: Can potentially create a deadlock. Add a timeout.
+		return err
+	}
+
+	m.isLocked = false
+	return nil
+}
+
+// unlockErr calls unlock and returns a combined error
+// if a prevErr is not nil.
+func (m *Migrate) unlockErr(prevErr error) error {
+	if err := m.unlock(); err != nil {
+		return multierror.Append(prevErr, err)
+	}
+	return prevErr
+}
+
+// logPrintf writes to m.Log if not nil
+func (m *Migrate) logPrintf(format string, v ...interface{}) {
+	if m.Log != nil {
+		m.Log.Printf(format, v...)
+	}
+}
+
+// logVerbosePrintf writes to m.Log if not nil. Use for verbose logging output.
+func (m *Migrate) logVerbosePrintf(format string, v ...interface{}) {
+	if m.Log != nil && m.Log.Verbose() {
+		m.Log.Printf(format, v...)
+	}
+}
+
+// logErr writes error to m.Log if not nil
+func (m *Migrate) logErr(err error) {
+	if m.Log != nil {
+		m.Log.Printf("error: %v", err)
+	}
+}

vendor/github.com/golang-migrate/migrate/v4/migration.go

@@ -0,0 +1,160 @@
+package migrate
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"time"
+)
+
+// DefaultBufferSize sets the in memory buffer size (in Bytes) for every
+// pre-read migration (see DefaultPrefetchMigrations).
+var DefaultBufferSize = uint(100000)
+
+// Migration holds information about a migration.
+// It is initially created from data coming from the source and then
+// used when run against the database.
+type Migration struct {
+	// Identifier can be any string to help identifying
+	// the migration in the source.
+	Identifier string
+
+	// Version is the version of this migration.
+	Version uint
+
+	// TargetVersion is the migration version after this migration
+	// has been applied to the database.
+	// Can be -1, implying that this is a NilVersion.
+	TargetVersion int
+
+	// Body holds an io.ReadCloser to the source.
+	Body io.ReadCloser
+
+	// BufferedBody holds an buffered io.Reader to the underlying Body.
+	BufferedBody io.Reader
+
+	// BufferSize defaults to DefaultBufferSize
+	BufferSize uint
+
+	// bufferWriter holds an io.WriteCloser and pipes to BufferBody.
+	// It's an *Closer for flow control.
+	bufferWriter io.WriteCloser
+
+	// Scheduled is the time when the migration was scheduled/ queued.
+	Scheduled time.Time
+
+	// StartedBuffering is the time when buffering of the migration source started.
+	StartedBuffering time.Time
+
+	// FinishedBuffering is the time when buffering of the migration source finished.
+	FinishedBuffering time.Time
+
+	// FinishedReading is the time when the migration source is fully read.
+	FinishedReading time.Time
+
+	// BytesRead holds the number of Bytes read from the migration source.
+	BytesRead int64
+}
+
+// NewMigration returns a new Migration and sets the body, identifier,
+// version and targetVersion. Body can be nil, which turns this migration
+// into a "NilMigration". If no identifier is provided, it will default to "<empty>".
+// targetVersion can be -1, implying it is a NilVersion.
+//
+// What is a NilMigration?
+// Usually each migration version coming from source is expected to have an
+// Up and Down migration. This is not a hard requirement though, leading to
+// a situation where only the Up or Down migration is present. So let's say
+// the user wants to migrate up to a version that doesn't have the actual Up
+// migration, in that case we still want to apply the version, but with an empty
+// body. We are calling that a NilMigration, a migration with an empty body.
+//
+// What is a NilVersion?
+// NilVersion is a const(-1). When running down migrations and we are at the
+// last down migration, there is no next down migration, the targetVersion should
+// be nil. Nil in this case is represented by -1 (because type int).
+func NewMigration(body io.ReadCloser, identifier string,
+	version uint, targetVersion int) (*Migration, error) {
+	tnow := time.Now()
+	m := &Migration{
+		Identifier:    identifier,
+		Version:       version,
+		TargetVersion: targetVersion,
+		Scheduled:     tnow,
+	}
+
+	if body == nil {
+		if len(identifier) == 0 {
+			m.Identifier = "<empty>"
+		}
+
+		m.StartedBuffering = tnow
+		m.FinishedBuffering = tnow
+		m.FinishedReading = tnow
+		return m, nil
+	}
+
+	br, bw := io.Pipe()
+	m.Body = body // want to simulate low latency? newSlowReader(body)
+	m.BufferSize = DefaultBufferSize
+	m.BufferedBody = br
+	m.bufferWriter = bw
+	return m, nil
+}
+
+// String implements string.Stringer and is used in tests.
+func (m *Migration) String() string {
+	return fmt.Sprintf("%v [%v=>%v]", m.Identifier, m.Version, m.TargetVersion)
+}
+
+// LogString returns a string describing this migration to humans.
+func (m *Migration) LogString() string {
+	directionStr := "u"
+	if m.TargetVersion < int(m.Version) {
+		directionStr = "d"
+	}
+	return fmt.Sprintf("%v/%v %v", m.Version, directionStr, m.Identifier)
+}
+
+// Buffer buffers Body up to BufferSize.
+// Calling this function blocks. Call with goroutine.
+func (m *Migration) Buffer() error {
+	if m.Body == nil {
+		return nil
+	}
+
+	m.StartedBuffering = time.Now()
+
+	b := bufio.NewReaderSize(m.Body, int(m.BufferSize))
+
+	// start reading from body, peek won't move the read pointer though
+	// poor man's solution?
+	if _, err := b.Peek(int(m.BufferSize)); err != nil && err != io.EOF {
+		return err
+	}
+
+	m.FinishedBuffering = time.Now()
+
+	// write to bufferWriter, this will block until
+	// something starts reading from m.Buffer
+	n, err := b.WriteTo(m.bufferWriter)
+	if err != nil {
+		return err
+	}
+
+	m.FinishedReading = time.Now()
+	m.BytesRead = n
+
+	// close bufferWriter so Buffer knows that there is no
+	// more data coming
+	if err := m.bufferWriter.Close(); err != nil {
+		return err
+	}
+
+	// it's safe to close the Body too
+	if err := m.Body.Close(); err != nil {
+		return err
+	}
+
+	return nil
+}

vendor/github.com/golang-migrate/migrate/v4/source/driver.go

@@ -0,0 +1,118 @@
+// Package source provides the Source interface.
+// All source drivers must implement this interface, register themselves,
+// optionally provide a `WithInstance` function and pass the tests
+// in package source/testing.
+package source
+
+import (
+	"fmt"
+	"io"
+	nurl "net/url"
+	"sync"
+)
+
+var driversMu sync.RWMutex
+var drivers = make(map[string]Driver)
+
+// Driver is the interface every source driver must implement.
+//
+// How to implement a source driver?
+//   1. Implement this interface.
+//   2. Optionally, add a function named `WithInstance`.
+//      This function should accept an existing source instance and a Config{} struct
+//      and return a driver instance.
+//   3. Add a test that calls source/testing.go:Test()
+//   4. Add own tests for Open(), WithInstance() (when provided) and Close().
+//      All other functions are tested by tests in source/testing.
+//      Saves you some time and makes sure all source drivers behave the same way.
+//   5. Call Register in init().
+//
+// Guidelines:
+//   * All configuration input must come from the URL string in func Open()
+//     or the Config{} struct in WithInstance. Don't os.Getenv().
+//   * Drivers are supposed to be read only.
+//   * Ideally don't load any contents (into memory) in Open or WithInstance.
+type Driver interface {
+	// Open returns a a new driver instance configured with parameters
+	// coming from the URL string. Migrate will call this function
+	// only once per instance.
+	Open(url string) (Driver, error)
+
+	// Close closes the underlying source instance managed by the driver.
+	// Migrate will call this function only once per instance.
+	Close() error
+
+	// First returns the very first migration version available to the driver.
+	// Migrate will call this function multiple times.
+	// If there is no version available, it must return os.ErrNotExist.
+	First() (version uint, err error)
+
+	// Prev returns the previous version for a given version available to the driver.
+	// Migrate will call this function multiple times.
+	// If there is no previous version available, it must return os.ErrNotExist.
+	Prev(version uint) (prevVersion uint, err error)
+
+	// Next returns the next version for a given version available to the driver.
+	// Migrate will call this function multiple times.
+	// If there is no next version available, it must return os.ErrNotExist.
+	Next(version uint) (nextVersion uint, err error)
+
+	// ReadUp returns the UP migration body and an identifier that helps
+	// finding this migration in the source for a given version.
+	// If there is no up migration available for this version,
+	// it must return os.ErrNotExist.
+	// Do not start reading, just return the ReadCloser!
+	ReadUp(version uint) (r io.ReadCloser, identifier string, err error)
+
+	// ReadDown returns the DOWN migration body and an identifier that helps
+	// finding this migration in the source for a given version.
+	// If there is no down migration available for this version,
+	// it must return os.ErrNotExist.
+	// Do not start reading, just return the ReadCloser!
+	ReadDown(version uint) (r io.ReadCloser, identifier string, err error)
+}
+
+// Open returns a new driver instance.
+func Open(url string) (Driver, error) {
+	u, err := nurl.Parse(url)
+	if err != nil {
+		return nil, err
+	}
+
+	if u.Scheme == "" {
+		return nil, fmt.Errorf("source driver: invalid URL scheme")
+	}
+
+	driversMu.RLock()
+	d, ok := drivers[u.Scheme]
+	driversMu.RUnlock()
+	if !ok {
+		return nil, fmt.Errorf("source driver: unknown driver '%s' (forgotten import?)", u.Scheme)
+	}
+
+	return d.Open(url)
+}
+
+// Register globally registers a driver.
+func Register(name string, driver Driver) {
+	driversMu.Lock()
+	defer driversMu.Unlock()
+	if driver == nil {
+		panic("Register driver is nil")
+	}
+	if _, dup := drivers[name]; dup {
+		panic("Register called twice for driver " + name)
+	}
+	drivers[name] = driver
+}
+
+// List lists the registered drivers
+func List() []string {
+	driversMu.RLock()
+	defer driversMu.RUnlock()
+	names := make([]string, 0, len(drivers))
+	for n := range drivers {
+		names = append(names, n)
+	}
+	return names
+}

vendor/github.com/golang-migrate/migrate/v4/source/errors.go

@@ -0,0 +1,15 @@
+package source
+
+import "os"
+
+// ErrDuplicateMigration is an error type for reporting duplicate migration
+// files.
+type ErrDuplicateMigration struct {
+	Migration
+	os.FileInfo
+}
+
+// Error implements error interface.
+func (e ErrDuplicateMigration) Error() string {
+	return "duplicate migration file: " + e.Name()
+}

vendor/github.com/golang-migrate/migrate/v4/source/iofs/README.md

@@ -0,0 +1,3 @@
+# iofs
+
+https://pkg.go.dev/github.com/golang-migrate/migrate/v4/source/iofs

vendor/github.com/golang-migrate/migrate/v4/source/iofs/doc.go

@@ -0,0 +1,10 @@
+/*
+Package iofs provides the Go 1.16+ io/fs#FS driver.
+
+It can accept various file systems (like embed.FS, archive/zip#Reader) implementing io/fs#FS.
+
+This driver cannot be used with Go versions 1.15 and below.
+
+Also, Opening with a URL scheme is not supported.
+*/
+package iofs

vendor/github.com/golang-migrate/migrate/v4/source/iofs/iofs.go

@@ -0,0 +1,176 @@
+//go:build go1.16
+// +build go1.16
+
+package iofs
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"path"
+	"strconv"
+
+	"github.com/golang-migrate/migrate/v4/source"
+)
+
+type driver struct {
+	PartialDriver
+}
+
+// New returns a new Driver from io/fs#FS and a relative path.
+func New(fsys fs.FS, path string) (source.Driver, error) {
+	var i driver
+	if err := i.Init(fsys, path); err != nil {
+		return nil, fmt.Errorf("failed to init driver with path %s: %w", path, err)
+	}
+	return &i, nil
+}
+
+// Open is part of source.Driver interface implementation.
+// Open cannot be called on the iofs passthrough driver.
+func (d *driver) Open(url string) (source.Driver, error) {
+	return nil, errors.New("Open() cannot be called on the iofs passthrough driver")
+}
+
+// PartialDriver is a helper service for creating new source drivers working with
+// io/fs.FS instances. It implements all source.Driver interface methods
+// except for Open(). New driver could embed this struct and add missing Open()
+// method.
+//
+// To prepare PartialDriver for use Init() function.
+type PartialDriver struct {
+	migrations *source.Migrations
+	fsys       fs.FS
+	path       string
+}
+
+// Init prepares not initialized IoFS instance to read migrations from a
+// io/fs#FS instance and a relative path.
+func (d *PartialDriver) Init(fsys fs.FS, path string) error {
+	entries, err := fs.ReadDir(fsys, path)
+	if err != nil {
+		return err
+	}
+
+	ms := source.NewMigrations()
+	for _, e := range entries {
+		if e.IsDir() {
+			continue
+		}
+		m, err := source.DefaultParse(e.Name())
+		if err != nil {
+			continue
+		}
+		file, err := e.Info()
+		if err != nil {
+			return err
+		}
+		if !ms.Append(m) {
+			return source.ErrDuplicateMigration{
+				Migration: *m,
+				FileInfo:  file,
+			}
+		}
+	}
+
+	d.fsys = fsys
+	d.path = path
+	d.migrations = ms
+	return nil
+}
+
+// Close is part of source.Driver interface implementation.
+// Closes the file system if possible.
+func (d *PartialDriver) Close() error {
+	c, ok := d.fsys.(io.Closer)
+	if !ok {
+		return nil
+	}
+	return c.Close()
+}
+
+// First is part of source.Driver interface implementation.
+func (d *PartialDriver) First() (version uint, err error) {
+	if version, ok := d.migrations.First(); ok {
+		return version, nil
+	}
+	return 0, &fs.PathError{
+		Op:   "first",
+		Path: d.path,
+		Err:  fs.ErrNotExist,
+	}
+}
+
+// Prev is part of source.Driver interface implementation.
+func (d *PartialDriver) Prev(version uint) (prevVersion uint, err error) {
+	if version, ok := d.migrations.Prev(version); ok {
+		return version, nil
+	}
+	return 0, &fs.PathError{
+		Op:   "prev for version " + strconv.FormatUint(uint64(version), 10),
+		Path: d.path,
+		Err:  fs.ErrNotExist,
+	}
+}
+
+// Next is part of source.Driver interface implementation.
+func (d *PartialDriver) Next(version uint) (nextVersion uint, err error) {
+	if version, ok := d.migrations.Next(version); ok {
+		return version, nil
+	}
+	return 0, &fs.PathError{
+		Op:   "next for version " + strconv.FormatUint(uint64(version), 10),
+		Path: d.path,
+		Err:  fs.ErrNotExist,
+	}
+}
+
+// ReadUp is part of source.Driver interface implementation.
+func (d *PartialDriver) ReadUp(version uint) (r io.ReadCloser, identifier string, err error) {
+	if m, ok := d.migrations.Up(version); ok {
+		body, err := d.open(path.Join(d.path, m.Raw))
+		if err != nil {
+			return nil, "", err
+		}
+		return body, m.Identifier, nil
+	}
+	return nil, "", &fs.PathError{
+		Op:   "read up for version " + strconv.FormatUint(uint64(version), 10),
+		Path: d.path,
+		Err:  fs.ErrNotExist,
+	}
+}
+
+// ReadDown is part of source.Driver interface implementation.
+func (d *PartialDriver) ReadDown(version uint) (r io.ReadCloser, identifier string, err error) {
+	if m, ok := d.migrations.Down(version); ok {
+		body, err := d.open(path.Join(d.path, m.Raw))
+		if err != nil {
+			return nil, "", err
+		}
+		return body, m.Identifier, nil
+	}
+	return nil, "", &fs.PathError{
+		Op:   "read down for version " + strconv.FormatUint(uint64(version), 10),
+		Path: d.path,
+		Err:  fs.ErrNotExist,
+	}
+}
+
+func (d *PartialDriver) open(path string) (fs.File, error) {
+	f, err := d.fsys.Open(path)
+	if err == nil {
+		return f, nil
+	}
+	// Some non-standard file systems may return errors that don't include the path, that
+	// makes debugging harder.
+	if !errors.As(err, new(*fs.PathError)) {
+		err = &fs.PathError{
+			Op:   "open",
+			Path: path,
+			Err:  err,
+		}
+	}
+	return nil, err
+}

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/1_foobar.down.sql

@@ -0,0 +1 @@
+1 down

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/1_foobar.up.sql

@@ -0,0 +1 @@
+1 up

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/3_foobar.up.sql

@@ -0,0 +1 @@
+3 up

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/4_foobar.down.sql

@@ -0,0 +1 @@
+4 down

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/4_foobar.up.sql

@@ -0,0 +1 @@
+4 up

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/5_foobar.down.sql

@@ -0,0 +1 @@
+5 down

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/7_foobar.down.sql

@@ -0,0 +1 @@
+7 down

vendor/github.com/golang-migrate/migrate/v4/source/iofs/testdata/migrations/7_foobar.up.sql

@@ -0,0 +1 @@
+7 up

vendor/github.com/golang-migrate/migrate/v4/source/migration.go

@@ -0,0 +1,143 @@
+package source
+
+import (
+	"sort"
+)
+
+// Direction is either up or down.
+type Direction string
+
+const (
+	Down Direction = "down"
+	Up   Direction = "up"
+)
+
+// Migration is a helper struct for source drivers that need to
+// build the full directory tree in memory.
+// Migration is fully independent from migrate.Migration.
+type Migration struct {
+	// Version is the version of this migration.
+	Version uint
+
+	// Identifier can be any string that helps identifying
+	// this migration in the source.
+	Identifier string
+
+	// Direction is either Up or Down.
+	Direction Direction
+
+	// Raw holds the raw location path to this migration in source.
+	// ReadUp and ReadDown will use this.
+	Raw string
+}
+
+// Migrations wraps Migration and has an internal index
+// to keep track of Migration order.
+type Migrations struct {
+	index      uintSlice
+	migrations map[uint]map[Direction]*Migration
+}
+
+func NewMigrations() *Migrations {
+	return &Migrations{
+		index:      make(uintSlice, 0),
+		migrations: make(map[uint]map[Direction]*Migration),
+	}
+}
+
+func (i *Migrations) Append(m *Migration) (ok bool) {
+	if m == nil {
+		return false
+	}
+
+	if i.migrations[m.Version] == nil {
+		i.migrations[m.Version] = make(map[Direction]*Migration)
+	}
+
+	// reject duplicate versions
+	if _, dup := i.migrations[m.Version][m.Direction]; dup {
+		return false
+	}
+
+	i.migrations[m.Version][m.Direction] = m
+	i.buildIndex()
+
+	return true
+}
+
+func (i *Migrations) buildIndex() {
+	i.index = make(uintSlice, 0)
+	for version := range i.migrations {
+		i.index = append(i.index, version)
+	}
+	sort.Sort(i.index)
+}
+
+func (i *Migrations) First() (version uint, ok bool) {
+	if len(i.index) == 0 {
+		return 0, false
+	}
+	return i.index[0], true
+}
+
+func (i *Migrations) Prev(version uint) (prevVersion uint, ok bool) {
+	pos := i.findPos(version)
+	if pos >= 1 && len(i.index) > pos-1 {
+		return i.index[pos-1], true
+	}
+	return 0, false
+}
+
+func (i *Migrations) Next(version uint) (nextVersion uint, ok bool) {
+	pos := i.findPos(version)
+	if pos >= 0 && len(i.index) > pos+1 {
+		return i.index[pos+1], true
+	}
+	return 0, false
+}
+
+func (i *Migrations) Up(version uint) (m *Migration, ok bool) {
+	if _, ok := i.migrations[version]; ok {
+		if mx, ok := i.migrations[version][Up]; ok {
+			return mx, true
+		}
+	}
+	return nil, false
+}
+
+func (i *Migrations) Down(version uint) (m *Migration, ok bool) {
+	if _, ok := i.migrations[version]; ok {
+		if mx, ok := i.migrations[version][Down]; ok {
+			return mx, true
+		}
+	}
+	return nil, false
+}
+
+func (i *Migrations) findPos(version uint) int {
+	if len(i.index) > 0 {
+		ix := i.index.Search(version)
+		if ix < len(i.index) && i.index[ix] == version {
+			return ix
+		}
+	}
+	return -1
+}
+
+type uintSlice []uint
+
+func (s uintSlice) Len() int {
+	return len(s)
+}
+
+func (s uintSlice) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s uintSlice) Less(i, j int) bool {
+	return s[i] < s[j]
+}
+
+func (s uintSlice) Search(x uint) int {
+	return sort.Search(len(s), func(i int) bool { return s[i] >= x })
+}

vendor/github.com/golang-migrate/migrate/v4/source/parse.go

@@ -0,0 +1,39 @@
+package source
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+var (
+	ErrParse = fmt.Errorf("no match")
+)
+
+var (
+	DefaultParse = Parse
+	DefaultRegex = Regex
+)
+
+// Regex matches the following pattern:
+//  123_name.up.ext
+//  123_name.down.ext
+var Regex = regexp.MustCompile(`^([0-9]+)_(.*)\.(` + string(Down) + `|` + string(Up) + `)\.(.*)$`)
+
+// Parse returns Migration for matching Regex pattern.
+func Parse(raw string) (*Migration, error) {
+	m := Regex.FindStringSubmatch(raw)
+	if len(m) == 5 {
+		versionUint64, err := strconv.ParseUint(m[1], 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		return &Migration{
+			Version:    uint(versionUint64),
+			Identifier: m[2],
+			Direction:  Direction(m[3]),
+			Raw:        raw,
+		}, nil
+	}
+	return nil, ErrParse
+}

vendor/github.com/golang-migrate/migrate/v4/util.go

@@ -0,0 +1,62 @@
+package migrate
+
+import (
+	"fmt"
+	nurl "net/url"
+	"strings"
+)
+
+// MultiError holds multiple errors.
+//
+// Deprecated: Use github.com/hashicorp/go-multierror instead
+type MultiError struct {
+	Errs []error
+}
+
+// NewMultiError returns an error type holding multiple errors.
+//
+// Deprecated: Use github.com/hashicorp/go-multierror instead
+//
+func NewMultiError(errs ...error) MultiError {
+	compactErrs := make([]error, 0)
+	for _, e := range errs {
+		if e != nil {
+			compactErrs = append(compactErrs, e)
+		}
+	}
+	return MultiError{compactErrs}
+}
+
+// Error implements error. Multiple errors are concatenated with 'and's.
+func (m MultiError) Error() string {
+	var strs = make([]string, 0)
+	for _, e := range m.Errs {
+		if len(e.Error()) > 0 {
+			strs = append(strs, e.Error())
+		}
+	}
+	return strings.Join(strs, " and ")
+}
+
+// suint safely converts int to uint
+// see https://goo.gl/wEcqof
+// see https://goo.gl/pai7Dr
+func suint(n int) uint {
+	if n < 0 {
+		panic(fmt.Sprintf("suint(%v) expects input >= 0", n))
+	}
+	return uint(n)
+}
+
+// FilterCustomQuery filters all query values starting with `x-`
+func FilterCustomQuery(u *nurl.URL) *nurl.URL {
+	ux := *u
+	vx := make(nurl.Values)
+	for k, v := range ux.Query() {
+		if len(k) <= 1 || (len(k) > 1 && k[0:2] != "x-") {
+			vx[k] = v
+		}
+	}
+	ux.RawQuery = vx.Encode()
+	return &ux
+}

vendor/github.com/hashicorp/errwrap/LICENSE

@@ -0,0 +1,354 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+     means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of version
+        1.1 or earlier of the License, but not also under the terms of a
+        Secondary License.
+
+1.6. “Executable Form”
+
+     means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+     means a work that combines Covered Software with other material, in a separate
+     file or files, that is not Covered Software.
+
+1.8. “License”
+
+     means this document.
+
+1.9. “Licensable”
+
+     means having the right to grant, to the maximum extent possible, whether at the
+     time of the initial grant or subsequently, any and all of the rights conveyed by
+     this License.
+
+1.10. “Modifications”
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to, deletion
+        from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+      means any patent claim(s), including without limitation, method, process,
+      and apparatus claims, in any patent Licensable by such Contributor that
+      would be infringed, but for the grant of the License, by the making,
+      using, selling, offering for sale, having made, import, or transfer of
+      either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+      means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, “You” includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, “control” means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or as
+        part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its Contributions
+        or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution become
+     effective for each Contribution on the date the Contributor first distributes
+     such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under this
+     License. No additional rights or licenses will be implied from the distribution
+     or licensing of Covered Software under this License. Notwithstanding Section
+     2.1(b) above, no patent license is granted by a Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party’s
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of its
+        Contributions.
+
+     This License does not grant any rights in the trademarks, service marks, or
+     logos of any Contributor (except as may be necessary to comply with the
+     notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this License
+     (see Section 10.2) or under the terms of a Secondary License (if permitted
+     under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its Contributions
+     are its original creation(s) or it has sufficient rights to grant the
+     rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under applicable
+     copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under the
+     terms of this License. You must inform recipients that the Source Code Form
+     of the Covered Software is governed by the terms of this License, and how
+     they can obtain a copy of this License. You may not attempt to alter or
+     restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this License,
+        or sublicense it under different terms, provided that the license for
+        the Executable Form does not attempt to limit or alter the recipients’
+        rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for the
+     Covered Software. If the Larger Work is a combination of Covered Software
+     with a work governed by one or more Secondary Licenses, and the Covered
+     Software is not Incompatible With Secondary Licenses, this License permits
+     You to additionally distribute such Covered Software under the terms of
+     such Secondary License(s), so that the recipient of the Larger Work may, at
+     their option, further distribute the Covered Software under the terms of
+     either this License or such Secondary License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices (including
+     copyright notices, patent notices, disclaimers of warranty, or limitations
+     of liability) contained within the Source Code Form of the Covered
+     Software, except that You may alter any license notices to the extent
+     required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on behalf
+     of any Contributor. You must make it absolutely clear that any such
+     warranty, support, indemnity, or liability obligation is offered by You
+     alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute, judicial
+   order, or regulation then You must: (a) comply with the terms of this License
+   to the maximum extent possible; and (b) describe the limitations and the code
+   they affect. Such description must be placed in a text file included with all
+   distributions of the Covered Software under this License. Except to the
+   extent prohibited by statute or regulation, such description must be
+   sufficiently detailed for a recipient of ordinary skill to be able to
+   understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+     if such Contributor fails to notify You of the non-compliance by some
+     reasonable means prior to 60 days after You have come back into compliance.
+     Moreover, Your grants from a particular Contributor are reinstated on an
+     ongoing basis if such Contributor notifies You of the non-compliance by
+     some reasonable means, this is the first time You have received notice of
+     non-compliance with this License from such Contributor, and You become
+     compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions, counter-claims,
+     and cross-claims) alleging that a Contributor Version directly or
+     indirectly infringes any patent, then the rights granted to You by any and
+     all Contributors for the Covered Software under Section 2.1 of this License
+     shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an “as is” basis, without
+   warranty of any kind, either expressed, implied, or statutory, including,
+   without limitation, warranties that the Covered Software is free of defects,
+   merchantable, fit for a particular purpose or non-infringing. The entire
+   risk as to the quality and performance of the Covered Software is with You.
+   Should any Covered Software prove defective in any respect, You (not any
+   Contributor) assume the cost of any necessary servicing, repair, or
+   correction. This disclaimer of warranty constitutes an essential part of this
+   License. No use of  any Covered Software is authorized under this License
+   except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from such
+   party’s negligence to the extent applicable law prohibits such limitation.
+   Some jurisdictions do not allow the exclusion or limitation of incidental or
+   consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts of
+   a jurisdiction where the defendant maintains its principal place of business
+   and such litigation shall be governed by laws of that jurisdiction, without
+   reference to its conflict-of-law provisions. Nothing in this Section shall
+   prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject matter
+   hereof. If any provision of this License is held to be unenforceable, such
+   provision shall be reformed only to the extent necessary to make it
+   enforceable. Any law or regulation which provides that the language of a
+   contract shall be construed against the drafter shall not be used to construe
+   this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version of
+      the License under which You originally received the Covered Software, or
+      under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a modified
+      version of this License if you rename the license and remove any
+      references to the name of the license steward (except to note that such
+      modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+      If You choose to distribute Source Code Form that is Incompatible With
+      Secondary Licenses under the terms of this version of the License, the
+      notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+      This Source Code Form is “Incompatible
+      With Secondary Licenses”, as defined by
+      the Mozilla Public License, v. 2.0.
+

vendor/github.com/hashicorp/errwrap/README.md

@@ -0,0 +1,89 @@
+# errwrap
+
+`errwrap` is a package for Go that formalizes the pattern of wrapping errors
+and checking if an error contains another error.
+
+There is a common pattern in Go of taking a returned `error` value and
+then wrapping it (such as with `fmt.Errorf`) before returning it. The problem
+with this pattern is that you completely lose the original `error` structure.
+
+Arguably the _correct_ approach is that you should make a custom structure
+implementing the `error` interface, and have the original error as a field
+on that structure, such [as this example](http://golang.org/pkg/os/#PathError).
+This is a good approach, but you have to know the entire chain of possible
+rewrapping that happens, when you might just care about one.
+
+`errwrap` formalizes this pattern (it doesn't matter what approach you use
+above) by giving a single interface for wrapping errors, checking if a specific
+error is wrapped, and extracting that error.
+
+## Installation and Docs
+
+Install using `go get github.com/hashicorp/errwrap`.
+
+Full documentation is available at
+http://godoc.org/github.com/hashicorp/errwrap
+
+## Usage
+
+#### Basic Usage
+
+Below is a very basic example of its usage:
+
+```go
+// A function that always returns an error, but wraps it, like a real
+// function might.
+func tryOpen() error {
+	_, err := os.Open("/i/dont/exist")
+	if err != nil {
+		return errwrap.Wrapf("Doesn't exist: {{err}}", err)
+	}
+
+	return nil
+}
+
+func main() {
+	err := tryOpen()
+
+	// We can use the Contains helpers to check if an error contains
+	// another error. It is safe to do this with a nil error, or with
+	// an error that doesn't even use the errwrap package.
+	if errwrap.Contains(err, "does not exist") {
+		// Do something
+	}
+	if errwrap.ContainsType(err, new(os.PathError)) {
+		// Do something
+	}
+
+	// Or we can use the associated `Get` functions to just extract
+	// a specific error. This would return nil if that specific error doesn't
+	// exist.
+	perr := errwrap.GetType(err, new(os.PathError))
+}
+```
+
+#### Custom Types
+
+If you're already making custom types that properly wrap errors, then
+you can get all the functionality of `errwraps.Contains` and such by
+implementing the `Wrapper` interface with just one function. Example:
+
+```go
+type AppError {
+  Code ErrorCode
+  Err  error
+}
+
+func (e *AppError) WrappedErrors() []error {
+  return []error{e.Err}
+}
+```
+
+Now this works:
+
+```go
+err := &AppError{Err: fmt.Errorf("an error")}
+if errwrap.ContainsType(err, fmt.Errorf("")) {
+	// This will work!
+}
+```

vendor/github.com/hashicorp/errwrap/errwrap.go

@@ -0,0 +1,169 @@
+// Package errwrap implements methods to formalize error wrapping in Go.
+//
+// All of the top-level functions that take an `error` are built to be able
+// to take any error, not just wrapped errors. This allows you to use errwrap
+// without having to type-check and type-cast everywhere.
+package errwrap
+
+import (
+	"errors"
+	"reflect"
+	"strings"
+)
+
+// WalkFunc is the callback called for Walk.
+type WalkFunc func(error)
+
+// Wrapper is an interface that can be implemented by custom types to
+// have all the Contains, Get, etc. functions in errwrap work.
+//
+// When Walk reaches a Wrapper, it will call the callback for every
+// wrapped error in addition to the wrapper itself. Since all the top-level
+// functions in errwrap use Walk, this means that all those functions work
+// with your custom type.
+type Wrapper interface {
+	WrappedErrors() []error
+}
+
+// Wrap defines that outer wraps inner, returning an error type that
+// can be cleanly used with the other methods in this package, such as
+// Contains, GetAll, etc.
+//
+// This function won't modify the error message at all (the outer message
+// will be used).
+func Wrap(outer, inner error) error {
+	return &wrappedError{
+		Outer: outer,
+		Inner: inner,
+	}
+}
+
+// Wrapf wraps an error with a formatting message. This is similar to using
+// `fmt.Errorf` to wrap an error. If you're using `fmt.Errorf` to wrap
+// errors, you should replace it with this.
+//
+// format is the format of the error message. The string '{{err}}' will
+// be replaced with the original error message.
+func Wrapf(format string, err error) error {
+	outerMsg := "<nil>"
+	if err != nil {
+		outerMsg = err.Error()
+	}
+
+	outer := errors.New(strings.Replace(
+		format, "{{err}}", outerMsg, -1))
+
+	return Wrap(outer, err)
+}
+
+// Contains checks if the given error contains an error with the
+// message msg. If err is not a wrapped error, this will always return
+// false unless the error itself happens to match this msg.
+func Contains(err error, msg string) bool {
+	return len(GetAll(err, msg)) > 0
+}
+
+// ContainsType checks if the given error contains an error with
+// the same concrete type as v. If err is not a wrapped error, this will
+// check the err itself.
+func ContainsType(err error, v interface{}) bool {
+	return len(GetAllType(err, v)) > 0
+}
+
+// Get is the same as GetAll but returns the deepest matching error.
+func Get(err error, msg string) error {
+	es := GetAll(err, msg)
+	if len(es) > 0 {
+		return es[len(es)-1]
+	}
+
+	return nil
+}
+
+// GetType is the same as GetAllType but returns the deepest matching error.
+func GetType(err error, v interface{}) error {
+	es := GetAllType(err, v)
+	if len(es) > 0 {
+		return es[len(es)-1]
+	}
+
+	return nil
+}
+
+// GetAll gets all the errors that might be wrapped in err with the
+// given message. The order of the errors is such that the outermost
+// matching error (the most recent wrap) is index zero, and so on.
+func GetAll(err error, msg string) []error {
+	var result []error
+
+	Walk(err, func(err error) {
+		if err.Error() == msg {
+			result = append(result, err)
+		}
+	})
+
+	return result
+}
+
+// GetAllType gets all the errors that are the same type as v.
+//
+// The order of the return value is the same as described in GetAll.
+func GetAllType(err error, v interface{}) []error {
+	var result []error
+
+	var search string
+	if v != nil {
+		search = reflect.TypeOf(v).String()
+	}
+	Walk(err, func(err error) {
+		var needle string
+		if err != nil {
+			needle = reflect.TypeOf(err).String()
+		}
+
+		if needle == search {
+			result = append(result, err)
+		}
+	})
+
+	return result
+}
+
+// Walk walks all the wrapped errors in err and calls the callback. If
+// err isn't a wrapped error, this will be called once for err. If err
+// is a wrapped error, the callback will be called for both the wrapper
+// that implements error as well as the wrapped error itself.
+func Walk(err error, cb WalkFunc) {
+	if err == nil {
+		return
+	}
+
+	switch e := err.(type) {
+	case *wrappedError:
+		cb(e.Outer)
+		Walk(e.Inner, cb)
+	case Wrapper:
+		cb(err)
+
+		for _, err := range e.WrappedErrors() {
+			Walk(err, cb)
+		}
+	default:
+		cb(err)
+	}
+}
+
+// wrappedError is an implementation of error that has both the
+// outer and inner errors.
+type wrappedError struct {
+	Outer error
+	Inner error
+}
+
+func (w *wrappedError) Error() string {
+	return w.Outer.Error()
+}
+
+func (w *wrappedError) WrappedErrors() []error {
+	return []error{w.Outer, w.Inner}
+}

vendor/github.com/hashicorp/go-multierror/.travis.yml

@@ -0,0 +1,12 @@
+sudo: false
+
+language: go
+
+go:
+  - 1.x
+
+branches:
+  only:
+    - master
+
+script: env GO111MODULE=on make test testrace

vendor/github.com/hashicorp/go-multierror/LICENSE

@@ -0,0 +1,353 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+     means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of version
+        1.1 or earlier of the License, but not also under the terms of a
+        Secondary License.
+
+1.6. “Executable Form”
+
+     means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+     means a work that combines Covered Software with other material, in a separate
+     file or files, that is not Covered Software.
+
+1.8. “License”
+
+     means this document.
+
+1.9. “Licensable”
+
+     means having the right to grant, to the maximum extent possible, whether at the
+     time of the initial grant or subsequently, any and all of the rights conveyed by
+     this License.
+
+1.10. “Modifications”
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to, deletion
+        from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+      means any patent claim(s), including without limitation, method, process,
+      and apparatus claims, in any patent Licensable by such Contributor that
+      would be infringed, but for the grant of the License, by the making,
+      using, selling, offering for sale, having made, import, or transfer of
+      either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+      means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, “You” includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, “control” means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or as
+        part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its Contributions
+        or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution become
+     effective for each Contribution on the date the Contributor first distributes
+     such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under this
+     License. No additional rights or licenses will be implied from the distribution
+     or licensing of Covered Software under this License. Notwithstanding Section
+     2.1(b) above, no patent license is granted by a Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party’s
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of its
+        Contributions.
+
+     This License does not grant any rights in the trademarks, service marks, or
+     logos of any Contributor (except as may be necessary to comply with the
+     notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this License
+     (see Section 10.2) or under the terms of a Secondary License (if permitted
+     under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its Contributions
+     are its original creation(s) or it has sufficient rights to grant the
+     rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under applicable
+     copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under the
+     terms of this License. You must inform recipients that the Source Code Form
+     of the Covered Software is governed by the terms of this License, and how
+     they can obtain a copy of this License. You may not attempt to alter or
+     restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this License,
+        or sublicense it under different terms, provided that the license for
+        the Executable Form does not attempt to limit or alter the recipients’
+        rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for the
+     Covered Software. If the Larger Work is a combination of Covered Software
+     with a work governed by one or more Secondary Licenses, and the Covered
+     Software is not Incompatible With Secondary Licenses, this License permits
+     You to additionally distribute such Covered Software under the terms of
+     such Secondary License(s), so that the recipient of the Larger Work may, at
+     their option, further distribute the Covered Software under the terms of
+     either this License or such Secondary License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices (including
+     copyright notices, patent notices, disclaimers of warranty, or limitations
+     of liability) contained within the Source Code Form of the Covered
+     Software, except that You may alter any license notices to the extent
+     required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on behalf
+     of any Contributor. You must make it absolutely clear that any such
+     warranty, support, indemnity, or liability obligation is offered by You
+     alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute, judicial
+   order, or regulation then You must: (a) comply with the terms of this License
+   to the maximum extent possible; and (b) describe the limitations and the code
+   they affect. Such description must be placed in a text file included with all
+   distributions of the Covered Software under this License. Except to the
+   extent prohibited by statute or regulation, such description must be
+   sufficiently detailed for a recipient of ordinary skill to be able to
+   understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+     if such Contributor fails to notify You of the non-compliance by some
+     reasonable means prior to 60 days after You have come back into compliance.
+     Moreover, Your grants from a particular Contributor are reinstated on an
+     ongoing basis if such Contributor notifies You of the non-compliance by
+     some reasonable means, this is the first time You have received notice of
+     non-compliance with this License from such Contributor, and You become
+     compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions, counter-claims,
+     and cross-claims) alleging that a Contributor Version directly or
+     indirectly infringes any patent, then the rights granted to You by any and
+     all Contributors for the Covered Software under Section 2.1 of this License
+     shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an “as is” basis, without
+   warranty of any kind, either expressed, implied, or statutory, including,
+   without limitation, warranties that the Covered Software is free of defects,
+   merchantable, fit for a particular purpose or non-infringing. The entire
+   risk as to the quality and performance of the Covered Software is with You.
+   Should any Covered Software prove defective in any respect, You (not any
+   Contributor) assume the cost of any necessary servicing, repair, or
+   correction. This disclaimer of warranty constitutes an essential part of this
+   License. No use of  any Covered Software is authorized under this License
+   except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from such
+   party’s negligence to the extent applicable law prohibits such limitation.
+   Some jurisdictions do not allow the exclusion or limitation of incidental or
+   consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts of
+   a jurisdiction where the defendant maintains its principal place of business
+   and such litigation shall be governed by laws of that jurisdiction, without
+   reference to its conflict-of-law provisions. Nothing in this Section shall
+   prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject matter
+   hereof. If any provision of this License is held to be unenforceable, such
+   provision shall be reformed only to the extent necessary to make it
+   enforceable. Any law or regulation which provides that the language of a
+   contract shall be construed against the drafter shall not be used to construe
+   this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version of
+      the License under which You originally received the Covered Software, or
+      under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a modified
+      version of this License if you rename the license and remove any
+      references to the name of the license steward (except to note that such
+      modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+      If You choose to distribute Source Code Form that is Incompatible With
+      Secondary Licenses under the terms of this version of the License, the
+      notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+      This Source Code Form is “Incompatible
+      With Secondary Licenses”, as defined by
+      the Mozilla Public License, v. 2.0.

vendor/github.com/hashicorp/go-multierror/Makefile

@@ -0,0 +1,31 @@
+TEST?=./...
+
+default: test
+
+# test runs the test suite and vets the code.
+test: generate
+	@echo "==> Running tests..."
+	@go list $(TEST) \
+		| grep -v "/vendor/" \
+		| xargs -n1 go test -timeout=60s -parallel=10 ${TESTARGS}
+
+# testrace runs the race checker
+testrace: generate
+	@echo "==> Running tests (race)..."
+	@go list $(TEST) \
+		| grep -v "/vendor/" \
+		| xargs -n1 go test -timeout=60s -race ${TESTARGS}
+
+# updatedeps installs all the dependencies needed to run and build.
+updatedeps:
+	@sh -c "'${CURDIR}/scripts/deps.sh' '${NAME}'"
+
+# generate runs `go generate` to build the dynamically generated source files.
+generate:
+	@echo "==> Generating..."
+	@find . -type f -name '.DS_Store' -delete
+	@go list ./... \
+		| grep -v "/vendor/" \
+		| xargs -n1 go generate
+
+.PHONY: default test testrace updatedeps generate

vendor/github.com/hashicorp/go-multierror/README.md

@@ -0,0 +1,131 @@
+# go-multierror
+
+[![Build Status](http://img.shields.io/travis/hashicorp/go-multierror.svg?style=flat-square)][travis]
+[![Go Documentation](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)][godocs]
+
+[travis]: https://travis-ci.org/hashicorp/go-multierror
+[godocs]: https://godoc.org/github.com/hashicorp/go-multierror
+
+`go-multierror` is a package for Go that provides a mechanism for
+representing a list of `error` values as a single `error`.
+
+This allows a function in Go to return an `error` that might actually
+be a list of errors. If the caller knows this, they can unwrap the
+list and access the errors. If the caller doesn't know, the error
+formats to a nice human-readable format.
+
+`go-multierror` is fully compatible with the Go standard library
+[errors](https://golang.org/pkg/errors/) package, including the
+functions `As`, `Is`, and `Unwrap`. This provides a standardized approach
+for introspecting on error values.
+
+## Installation and Docs
+
+Install using `go get github.com/hashicorp/go-multierror`.
+
+Full documentation is available at
+http://godoc.org/github.com/hashicorp/go-multierror
+
+## Usage
+
+go-multierror is easy to use and purposely built to be unobtrusive in
+existing Go applications/libraries that may not be aware of it.
+
+**Building a list of errors**
+
+The `Append` function is used to create a list of errors. This function
+behaves a lot like the Go built-in `append` function: it doesn't matter
+if the first argument is nil, a `multierror.Error`, or any other `error`,
+the function behaves as you would expect.
+
+```go
+var result error
+
+if err := step1(); err != nil {
+	result = multierror.Append(result, err)
+}
+if err := step2(); err != nil {
+	result = multierror.Append(result, err)
+}
+
+return result
+```
+
+**Customizing the formatting of the errors**
+
+By specifying a custom `ErrorFormat`, you can customize the format
+of the `Error() string` function:
+
+```go
+var result *multierror.Error
+
+// ... accumulate errors here, maybe using Append
+
+if result != nil {
+	result.ErrorFormat = func([]error) string {
+		return "errors!"
+	}
+}
+```
+
+**Accessing the list of errors**
+
+`multierror.Error` implements `error` so if the caller doesn't know about
+multierror, it will work just fine. But if you're aware a multierror might
+be returned, you can use type switches to access the list of errors:
+
+```go
+if err := something(); err != nil {
+	if merr, ok := err.(*multierror.Error); ok {
+		// Use merr.Errors
+	}
+}
+```
+
+You can also use the standard [`errors.Unwrap`](https://golang.org/pkg/errors/#Unwrap)
+function. This will continue to unwrap into subsequent errors until none exist.
+
+**Extracting an error**
+
+The standard library [`errors.As`](https://golang.org/pkg/errors/#As)
+function can be used directly with a multierror to extract a specific error:
+
+```go
+// Assume err is a multierror value
+err := somefunc()
+
+// We want to know if "err" has a "RichErrorType" in it and extract it.
+var errRich RichErrorType
+if errors.As(err, &errRich) {
+	// It has it, and now errRich is populated.
+}
+```
+
+**Checking for an exact error value**
+
+Some errors are returned as exact errors such as the [`ErrNotExist`](https://golang.org/pkg/os/#pkg-variables)
+error in the `os` package. You can check if this error is present by using
+the standard [`errors.Is`](https://golang.org/pkg/errors/#Is) function.
+
+```go
+// Assume err is a multierror value
+err := somefunc()
+if errors.Is(err, os.ErrNotExist) {
+	// err contains os.ErrNotExist
+}
+```
+
+**Returning a multierror only if there are errors**
+
+If you build a `multierror.Error`, you can use the `ErrorOrNil` function
+to return an `error` implementation only if there are errors to return:
+
+```go
+var result *multierror.Error
+
+// ... accumulate errors here
+
+// Return the `error` only if errors were added to the multierror, otherwise
+// return nil since there are no errors.
+return result.ErrorOrNil()
+```

vendor/github.com/hashicorp/go-multierror/append.go

@@ -0,0 +1,41 @@
+package multierror
+
+// Append is a helper function that will append more errors
+// onto an Error in order to create a larger multi-error.
+//
+// If err is not a multierror.Error, then it will be turned into
+// one. If any of the errs are multierr.Error, they will be flattened
+// one level into err.
+func Append(err error, errs ...error) *Error {
+	switch err := err.(type) {
+	case *Error:
+		// Typed nils can reach here, so initialize if we are nil
+		if err == nil {
+			err = new(Error)
+		}
+
+		// Go through each error and flatten
+		for _, e := range errs {
+			switch e := e.(type) {
+			case *Error:
+				if e != nil {
+					err.Errors = append(err.Errors, e.Errors...)
+				}
+			default:
+				if e != nil {
+					err.Errors = append(err.Errors, e)
+				}
+			}
+		}
+
+		return err
+	default:
+		newErrs := make([]error, 0, len(errs)+1)
+		if err != nil {
+			newErrs = append(newErrs, err)
+		}
+		newErrs = append(newErrs, errs...)
+
+		return Append(&Error{}, newErrs...)
+	}
+}

vendor/github.com/hashicorp/go-multierror/flatten.go

@@ -0,0 +1,26 @@
+package multierror
+
+// Flatten flattens the given error, merging any *Errors together into
+// a single *Error.
+func Flatten(err error) error {
+	// If it isn't an *Error, just return the error as-is
+	if _, ok := err.(*Error); !ok {
+		return err
+	}
+
+	// Otherwise, make the result and flatten away!
+	flatErr := new(Error)
+	flatten(err, flatErr)
+	return flatErr
+}
+
+func flatten(err error, flatErr *Error) {
+	switch err := err.(type) {
+	case *Error:
+		for _, e := range err.Errors {
+			flatten(e, flatErr)
+		}
+	default:
+		flatErr.Errors = append(flatErr.Errors, err)
+	}
+}

vendor/github.com/hashicorp/go-multierror/format.go

@@ -0,0 +1,27 @@
+package multierror
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ErrorFormatFunc is a function callback that is called by Error to
+// turn the list of errors into a string.
+type ErrorFormatFunc func([]error) string
+
+// ListFormatFunc is a basic formatter that outputs the number of errors
+// that occurred along with a bullet point list of the errors.
+func ListFormatFunc(es []error) string {
+	if len(es) == 1 {
+		return fmt.Sprintf("1 error occurred:\n\t* %s\n\n", es[0])
+	}
+
+	points := make([]string, len(es))
+	for i, err := range es {
+		points[i] = fmt.Sprintf("* %s", err)
+	}
+
+	return fmt.Sprintf(
+		"%d errors occurred:\n\t%s\n\n",
+		len(es), strings.Join(points, "\n\t"))
+}

vendor/github.com/hashicorp/go-multierror/group.go

@@ -0,0 +1,38 @@
+package multierror
+
+import "sync"
+
+// Group is a collection of goroutines which return errors that need to be
+// coalesced.
+type Group struct {
+	mutex sync.Mutex
+	err   *Error
+	wg    sync.WaitGroup
+}
+
+// Go calls the given function in a new goroutine.
+//
+// If the function returns an error it is added to the group multierror which
+// is returned by Wait.
+func (g *Group) Go(f func() error) {
+	g.wg.Add(1)
+
+	go func() {
+		defer g.wg.Done()
+
+		if err := f(); err != nil {
+			g.mutex.Lock()
+			g.err = Append(g.err, err)
+			g.mutex.Unlock()
+		}
+	}()
+}
+
+// Wait blocks until all function calls from the Go method have returned, then
+// returns the multierror.
+func (g *Group) Wait() *Error {
+	g.wg.Wait()
+	g.mutex.Lock()
+	defer g.mutex.Unlock()
+	return g.err
+}

vendor/github.com/hashicorp/go-multierror/multierror.go

@@ -0,0 +1,118 @@
+package multierror
+
+import (
+	"errors"
+	"fmt"
+)
+
+// Error is an error type to track multiple errors. This is used to
+// accumulate errors in cases and return them as a single "error".
+type Error struct {
+	Errors      []error
+	ErrorFormat ErrorFormatFunc
+}
+
+func (e *Error) Error() string {
+	fn := e.ErrorFormat
+	if fn == nil {
+		fn = ListFormatFunc
+	}
+
+	return fn(e.Errors)
+}
+
+// ErrorOrNil returns an error interface if this Error represents
+// a list of errors, or returns nil if the list of errors is empty. This
+// function is useful at the end of accumulation to make sure that the value
+// returned represents the existence of errors.
+func (e *Error) ErrorOrNil() error {
+	if e == nil {
+		return nil
+	}
+	if len(e.Errors) == 0 {
+		return nil
+	}
+
+	return e
+}
+
+func (e *Error) GoString() string {
+	return fmt.Sprintf("*%#v", *e)
+}
+
+// WrappedErrors returns the list of errors that this Error is wrapping.
+// It is an implementation of the errwrap.Wrapper interface so that
+// multierror.Error can be used with that library.
+//
+// This method is not safe to be called concurrently and is no different
+// than accessing the Errors field directly. It is implemented only to
+// satisfy the errwrap.Wrapper interface.
+func (e *Error) WrappedErrors() []error {
+	return e.Errors
+}
+
+// Unwrap returns an error from Error (or nil if there are no errors).
+// This error returned will further support Unwrap to get the next error,
+// etc. The order will match the order of Errors in the multierror.Error
+// at the time of calling.
+//
+// The resulting error supports errors.As/Is/Unwrap so you can continue
+// to use the stdlib errors package to introspect further.
+//
+// This will perform a shallow copy of the errors slice. Any errors appended
+// to this error after calling Unwrap will not be available until a new
+// Unwrap is called on the multierror.Error.
+func (e *Error) Unwrap() error {
+	// If we have no errors then we do nothing
+	if e == nil || len(e.Errors) == 0 {
+		return nil
+	}
+
+	// If we have exactly one error, we can just return that directly.
+	if len(e.Errors) == 1 {
+		return e.Errors[0]
+	}
+
+	// Shallow copy the slice
+	errs := make([]error, len(e.Errors))
+	copy(errs, e.Errors)
+	return chain(errs)
+}
+
+// chain implements the interfaces necessary for errors.Is/As/Unwrap to
+// work in a deterministic way with multierror. A chain tracks a list of
+// errors while accounting for the current represented error. This lets
+// Is/As be meaningful.
+//
+// Unwrap returns the next error. In the cleanest form, Unwrap would return
+// the wrapped error here but we can't do that if we want to properly
+// get access to all the errors. Instead, users are recommended to use
+// Is/As to get the correct error type out.
+//
+// Precondition: []error is non-empty (len > 0)
+type chain []error
+
+// Error implements the error interface
+func (e chain) Error() string {
+	return e[0].Error()
+}
+
+// Unwrap implements errors.Unwrap by returning the next error in the
+// chain or nil if there are no more errors.
+func (e chain) Unwrap() error {
+	if len(e) == 1 {
+		return nil
+	}
+
+	return e[1:]
+}
+
+// As implements errors.As by attempting to map to the current value.
+func (e chain) As(target interface{}) bool {
+	return errors.As(e[0], target)
+}
+
+// Is implements errors.Is by comparing the current value directly.
+func (e chain) Is(target error) bool {
+	return errors.Is(e[0], target)
+}

vendor/github.com/hashicorp/go-multierror/prefix.go

@@ -0,0 +1,37 @@
+package multierror
+
+import (
+	"fmt"
+
+	"github.com/hashicorp/errwrap"
+)
+
+// Prefix is a helper function that will prefix some text
+// to the given error. If the error is a multierror.Error, then
+// it will be prefixed to each wrapped error.
+//
+// This is useful to use when appending multiple multierrors
+// together in order to give better scoping.
+func Prefix(err error, prefix string) error {
+	if err == nil {
+		return nil
+	}
+
+	format := fmt.Sprintf("%s {{err}}", prefix)
+	switch err := err.(type) {
+	case *Error:
+		// Typed nils can reach here, so initialize if we are nil
+		if err == nil {
+			err = new(Error)
+		}
+
+		// Wrap each of the errors
+		for i, e := range err.Errors {
+			err.Errors[i] = errwrap.Wrapf(format, e)
+		}
+
+		return err
+	default:
+		return errwrap.Wrapf(format, err)
+	}
+}

vendor/github.com/hashicorp/go-multierror/sort.go

@@ -0,0 +1,16 @@
+package multierror
+
+// Len implements sort.Interface function for length
+func (err Error) Len() int {
+	return len(err.Errors)
+}
+
+// Swap implements sort.Interface function for swapping elements
+func (err Error) Swap(i, j int) {
+	err.Errors[i], err.Errors[j] = err.Errors[j], err.Errors[i]
+}
+
+// Less implements sort.Interface function for determining order
+func (err Error) Less(i, j int) bool {
+	return err.Errors[i].Error() < err.Errors[j].Error()
+}

vendor/github.com/rs/zerolog/.gitignore

@@ -0,0 +1,25 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+tmp
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

vendor/github.com/rs/zerolog/CNAME

@@ -0,0 +1 @@
+zerolog.io

vendor/github.com/rs/zerolog/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 Olivier Poitrey
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/rs/zerolog/README.md

@@ -0,0 +1,695 @@
+# Zero Allocation JSON Logger
+
+[![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/zerolog) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/zerolog/master/LICENSE) [![Build Status](https://travis-ci.org/rs/zerolog.svg?branch=master)](https://travis-ci.org/rs/zerolog) [![Coverage](http://gocover.io/_badge/github.com/rs/zerolog)](http://gocover.io/github.com/rs/zerolog)
+
+The zerolog package provides a fast and simple logger dedicated to JSON output.
+
+Zerolog's API is designed to provide both a great developer experience and stunning [performance](#benchmarks). Its unique chaining API allows zerolog to write JSON (or CBOR) log events by avoiding allocations and reflection.
+
+Uber's [zap](https://godoc.org/go.uber.org/zap) library pioneered this approach. Zerolog is taking this concept to the next level with a simpler to use API and even better performance.
+
+To keep the code base and the API simple, zerolog focuses on efficient structured logging only. Pretty logging on the console is made possible using the provided (but inefficient) [`zerolog.ConsoleWriter`](#pretty-logging).
+
+![Pretty Logging Image](pretty.png)
+
+## Who uses zerolog
+
+Find out [who uses zerolog](https://github.com/rs/zerolog/wiki/Who-uses-zerolog) and add your company / project to the list.
+
+## Features
+
+* [Blazing fast](#benchmarks)
+* [Low to zero allocation](#benchmarks)
+* [Leveled logging](#leveled-logging)
+* [Sampling](#log-sampling)
+* [Hooks](#hooks)
+* [Contextual fields](#contextual-logging)
+* `context.Context` integration
+* [Integration with `net/http`](#integration-with-nethttp)
+* [JSON and CBOR encoding formats](#binary-encoding)
+* [Pretty logging for development](#pretty-logging)
+* [Error Logging (with optional Stacktrace)](#error-logging)
+
+## Installation
+
+```bash
+go get -u github.com/rs/zerolog/log
+```
+
+## Getting Started
+
+### Simple Logging Example
+
+For simple logging, import the global logger package **github.com/rs/zerolog/log**
+
+```go
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    // UNIX Time is faster and smaller than most timestamps
+    zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+    log.Print("hello world")
+}
+
+// Output: {"time":1516134303,"level":"debug","message":"hello world"}
+```
+> Note: By default log writes to `os.Stderr`
+> Note: The default log level for `log.Print` is *debug*
+
+### Contextual Logging
+
+**zerolog** allows data to be added to log messages in the form of key:value pairs. The data added to the message adds "context" about the log event that can be critical for debugging as well as myriad other purposes. An example of this is below:
+
+```go
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+    log.Debug().
+        Str("Scale", "833 cents").
+        Float64("Interval", 833.09).
+        Msg("Fibonacci is everywhere")
+    
+    log.Debug().
+        Str("Name", "Tom").
+        Send()
+}
+
+// Output: {"level":"debug","Scale":"833 cents","Interval":833.09,"time":1562212768,"message":"Fibonacci is everywhere"}
+// Output: {"level":"debug","Name":"Tom","time":1562212768}
+```
+
+> You'll note in the above example that when adding contextual fields, the fields are strongly typed. You can find the full list of supported fields [here](#standard-types)
+
+### Leveled Logging
+
+#### Simple Leveled Logging Example
+
+```go
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+    log.Info().Msg("hello world")
+}
+
+// Output: {"time":1516134303,"level":"info","message":"hello world"}
+```
+
+> It is very important to note that when using the **zerolog** chaining API, as shown above (`log.Info().Msg("hello world"`), the chain must have either the `Msg` or `Msgf` method call. If you forget to add either of these, the log will not occur and there is no compile time error to alert you of this.
+
+**zerolog** allows for logging at the following levels (from highest to lowest):
+
+* panic (`zerolog.PanicLevel`, 5)
+* fatal (`zerolog.FatalLevel`, 4)
+* error (`zerolog.ErrorLevel`, 3)
+* warn (`zerolog.WarnLevel`, 2)
+* info (`zerolog.InfoLevel`, 1)
+* debug (`zerolog.DebugLevel`, 0)
+* trace (`zerolog.TraceLevel`, -1)
+
+You can set the Global logging level to any of these options using the `SetGlobalLevel` function in the zerolog package, passing in one of the given constants above, e.g. `zerolog.InfoLevel` would be the "info" level.  Whichever level is chosen, all logs with a level greater than or equal to that level will be written. To turn off logging entirely, pass the `zerolog.Disabled` constant.
+
+#### Setting Global Log Level
+
+This example uses command-line flags to demonstrate various outputs depending on the chosen log level.
+
+```go
+package main
+
+import (
+    "flag"
+
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+    debug := flag.Bool("debug", false, "sets log level to debug")
+
+    flag.Parse()
+
+    // Default level for this example is info, unless debug flag is present
+    zerolog.SetGlobalLevel(zerolog.InfoLevel)
+    if *debug {
+        zerolog.SetGlobalLevel(zerolog.DebugLevel)
+    }
+
+    log.Debug().Msg("This message appears only when log level set to Debug")
+    log.Info().Msg("This message appears when log level set to Debug or Info")
+
+    if e := log.Debug(); e.Enabled() {
+        // Compute log output only if enabled.
+        value := "bar"
+        e.Str("foo", value).Msg("some debug message")
+    }
+}
+```
+
+Info Output (no flag)
+
+```bash
+$ ./logLevelExample
+{"time":1516387492,"level":"info","message":"This message appears when log level set to Debug or Info"}
+```
+
+Debug Output (debug flag set)
+
+```bash
+$ ./logLevelExample -debug
+{"time":1516387573,"level":"debug","message":"This message appears only when log level set to Debug"}
+{"time":1516387573,"level":"info","message":"This message appears when log level set to Debug or Info"}
+{"time":1516387573,"level":"debug","foo":"bar","message":"some debug message"}
+```
+
+#### Logging without Level or Message
+
+You may choose to log without a specific level by using the `Log` method. You may also write without a message by setting an empty string in the `msg string` parameter of the `Msg` method. Both are demonstrated in the example below.
+
+```go
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+    log.Log().
+        Str("foo", "bar").
+        Msg("")
+}
+
+// Output: {"time":1494567715,"foo":"bar"}
+```
+
+### Error Logging
+
+You can log errors using the `Err` method
+
+```go
+package main
+
+import (
+	"errors"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+)
+
+func main() {
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+	err := errors.New("seems we have an error here")
+	log.Error().Err(err).Msg("")
+}
+
+// Output: {"level":"error","error":"seems we have an error here","time":1609085256}
+```
+
+> The default field name for errors is `error`, you can change this by setting `zerolog.ErrorFieldName` to meet your needs.
+
+#### Error Logging with Stacktrace
+
+Using `github.com/pkg/errors`, you can add a formatted stacktrace to your errors. 
+
+```go
+package main
+
+import (
+	"github.com/pkg/errors"
+	"github.com/rs/zerolog/pkgerrors"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+)
+
+func main() {
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+	zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack
+
+	err := outer()
+	log.Error().Stack().Err(err).Msg("")
+}
+
+func inner() error {
+	return errors.New("seems we have an error here")
+}
+
+func middle() error {
+	err := inner()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func outer() error {
+	err := middle()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// Output: {"level":"error","stack":[{"func":"inner","line":"20","source":"errors.go"},{"func":"middle","line":"24","source":"errors.go"},{"func":"outer","line":"32","source":"errors.go"},{"func":"main","line":"15","source":"errors.go"},{"func":"main","line":"204","source":"proc.go"},{"func":"goexit","line":"1374","source":"asm_amd64.s"}],"error":"seems we have an error here","time":1609086683}
+```
+
+> zerolog.ErrorStackMarshaler must be set in order for the stack to output anything.
+
+#### Logging Fatal Messages
+
+```go
+package main
+
+import (
+    "errors"
+
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    err := errors.New("A repo man spends his life getting into tense situations")
+    service := "myservice"
+
+    zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+    log.Fatal().
+        Err(err).
+        Str("service", service).
+        Msgf("Cannot start %s", service)
+}
+
+// Output: {"time":1516133263,"level":"fatal","error":"A repo man spends his life getting into tense situations","service":"myservice","message":"Cannot start myservice"}
+//         exit status 1
+```
+
+> NOTE: Using `Msgf` generates one allocation even when the logger is disabled.
+
+
+### Create logger instance to manage different outputs
+
+```go
+logger := zerolog.New(os.Stderr).With().Timestamp().Logger()
+
+logger.Info().Str("foo", "bar").Msg("hello world")
+
+// Output: {"level":"info","time":1494567715,"message":"hello world","foo":"bar"}
+```
+
+### Sub-loggers let you chain loggers with additional context
+
+```go
+sublogger := log.With().
+                 Str("component", "foo").
+                 Logger()
+sublogger.Info().Msg("hello world")
+
+// Output: {"level":"info","time":1494567715,"message":"hello world","component":"foo"}
+```
+
+### Pretty logging
+
+To log a human-friendly, colorized output, use `zerolog.ConsoleWriter`:
+
+```go
+log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
+
+log.Info().Str("foo", "bar").Msg("Hello world")
+
+// Output: 3:04PM INF Hello World foo=bar
+```
+
+To customize the configuration and formatting:
+
+```go
+output := zerolog.ConsoleWriter{Out: os.Stdout, TimeFormat: time.RFC3339}
+output.FormatLevel = func(i interface{}) string {
+    return strings.ToUpper(fmt.Sprintf("| %-6s|", i))
+}
+output.FormatMessage = func(i interface{}) string {
+    return fmt.Sprintf("***%s****", i)
+}
+output.FormatFieldName = func(i interface{}) string {
+    return fmt.Sprintf("%s:", i)
+}
+output.FormatFieldValue = func(i interface{}) string {
+    return strings.ToUpper(fmt.Sprintf("%s", i))
+}
+
+log := zerolog.New(output).With().Timestamp().Logger()
+
+log.Info().Str("foo", "bar").Msg("Hello World")
+
+// Output: 2006-01-02T15:04:05Z07:00 | INFO  | ***Hello World**** foo:BAR
+```
+
+### Sub dictionary
+
+```go
+log.Info().
+    Str("foo", "bar").
+    Dict("dict", zerolog.Dict().
+        Str("bar", "baz").
+        Int("n", 1),
+    ).Msg("hello world")
+
+// Output: {"level":"info","time":1494567715,"foo":"bar","dict":{"bar":"baz","n":1},"message":"hello world"}
+```
+
+### Customize automatic field names
+
+```go
+zerolog.TimestampFieldName = "t"
+zerolog.LevelFieldName = "l"
+zerolog.MessageFieldName = "m"
+
+log.Info().Msg("hello world")
+
+// Output: {"l":"info","t":1494567715,"m":"hello world"}
+```
+
+### Add contextual fields to the global logger
+
+```go
+log.Logger = log.With().Str("foo", "bar").Logger()
+```
+
+### Add file and line number to log
+
+```go
+log.Logger = log.With().Caller().Logger()
+log.Info().Msg("hello world")
+
+// Output: {"level": "info", "message": "hello world", "caller": "/go/src/your_project/some_file:21"}
+```
+
+
+### Thread-safe, lock-free, non-blocking writer
+
+If your writer might be slow or not thread-safe and you need your log producers to never get slowed down by a slow writer, you can use a `diode.Writer` as follow:
+
+```go
+wr := diode.NewWriter(os.Stdout, 1000, 10*time.Millisecond, func(missed int) {
+		fmt.Printf("Logger Dropped %d messages", missed)
+	})
+log := zerolog.New(wr)
+log.Print("test")
+```
+
+You will need to install `code.cloudfoundry.org/go-diodes` to use this feature.
+
+### Log Sampling
+
+```go
+sampled := log.Sample(&zerolog.BasicSampler{N: 10})
+sampled.Info().Msg("will be logged every 10 messages")
+
+// Output: {"time":1494567715,"level":"info","message":"will be logged every 10 messages"}
+```
+
+More advanced sampling:
+
+```go
+// Will let 5 debug messages per period of 1 second.
+// Over 5 debug message, 1 every 100 debug messages are logged.
+// Other levels are not sampled.
+sampled := log.Sample(zerolog.LevelSampler{
+    DebugSampler: &zerolog.BurstSampler{
+        Burst: 5,
+        Period: 1*time.Second,
+        NextSampler: &zerolog.BasicSampler{N: 100},
+    },
+})
+sampled.Debug().Msg("hello world")
+
+// Output: {"time":1494567715,"level":"debug","message":"hello world"}
+```
+
+### Hooks
+
+```go
+type SeverityHook struct{}
+
+func (h SeverityHook) Run(e *zerolog.Event, level zerolog.Level, msg string) {
+    if level != zerolog.NoLevel {
+        e.Str("severity", level.String())
+    }
+}
+
+hooked := log.Hook(SeverityHook{})
+hooked.Warn().Msg("")
+
+// Output: {"level":"warn","severity":"warn"}
+```
+
+### Pass a sub-logger by context
+
+```go
+ctx := log.With().Str("component", "module").Logger().WithContext(ctx)
+
+log.Ctx(ctx).Info().Msg("hello world")
+
+// Output: {"component":"module","level":"info","message":"hello world"}
+```
+
+### Set as standard logger output
+
+```go
+log := zerolog.New(os.Stdout).With().
+    Str("foo", "bar").
+    Logger()
+
+stdlog.SetFlags(0)
+stdlog.SetOutput(log)
+
+stdlog.Print("hello world")
+
+// Output: {"foo":"bar","message":"hello world"}
+```
+
+### Integration with `net/http`
+
+The `github.com/rs/zerolog/hlog` package provides some helpers to integrate zerolog with `http.Handler`.
+
+In this example we use [alice](https://github.com/justinas/alice) to install logger for better readability.
+
+```go
+log := zerolog.New(os.Stdout).With().
+    Timestamp().
+    Str("role", "my-service").
+    Str("host", host).
+    Logger()
+
+c := alice.New()
+
+// Install the logger handler with default output on the console
+c = c.Append(hlog.NewHandler(log))
+
+// Install some provided extra handler to set some request's context fields.
+// Thanks to that handler, all our logs will come with some prepopulated fields.
+c = c.Append(hlog.AccessHandler(func(r *http.Request, status, size int, duration time.Duration) {
+    hlog.FromRequest(r).Info().
+        Str("method", r.Method).
+        Stringer("url", r.URL).
+        Int("status", status).
+        Int("size", size).
+        Dur("duration", duration).
+        Msg("")
+}))
+c = c.Append(hlog.RemoteAddrHandler("ip"))
+c = c.Append(hlog.UserAgentHandler("user_agent"))
+c = c.Append(hlog.RefererHandler("referer"))
+c = c.Append(hlog.RequestIDHandler("req_id", "Request-Id"))
+
+// Here is your final handler
+h := c.Then(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+    // Get the logger from the request's context. You can safely assume it
+    // will be always there: if the handler is removed, hlog.FromRequest
+    // will return a no-op logger.
+    hlog.FromRequest(r).Info().
+        Str("user", "current user").
+        Str("status", "ok").
+        Msg("Something happened")
+
+    // Output: {"level":"info","time":"2001-02-03T04:05:06Z","role":"my-service","host":"local-hostname","req_id":"b4g0l5t6tfid6dtrapu0","user":"current user","status":"ok","message":"Something happened"}
+}))
+http.Handle("/", h)
+
+if err := http.ListenAndServe(":8080", nil); err != nil {
+    log.Fatal().Err(err).Msg("Startup failed")
+}
+```
+
+## Multiple Log Output
+`zerolog.MultiLevelWriter` may be used to send the log message to multiple outputs. 
+In this example, we send the log message to both `os.Stdout` and the in-built ConsoleWriter.
+```go
+func main() {
+	consoleWriter := zerolog.ConsoleWriter{Out: os.Stdout}
+
+	multi := zerolog.MultiLevelWriter(consoleWriter, os.Stdout)
+
+	logger := zerolog.New(multi).With().Timestamp().Logger()
+
+	logger.Info().Msg("Hello World!")
+}
+
+// Output (Line 1: Console; Line 2: Stdout)
+// 12:36PM INF Hello World!
+// {"level":"info","time":"2019-11-07T12:36:38+03:00","message":"Hello World!"}
+``` 
+
+## Global Settings
+
+Some settings can be changed and will by applied to all loggers:
+
+* `log.Logger`: You can set this value to customize the global logger (the one used by package level methods).
+* `zerolog.SetGlobalLevel`: Can raise the minimum level of all loggers. Call this with `zerolog.Disabled` to disable logging altogether (quiet mode).
+* `zerolog.DisableSampling`: If argument is `true`, all sampled loggers will stop sampling and issue 100% of their log events.
+* `zerolog.TimestampFieldName`: Can be set to customize `Timestamp` field name.
+* `zerolog.LevelFieldName`: Can be set to customize level field name.
+* `zerolog.MessageFieldName`: Can be set to customize message field name.
+* `zerolog.ErrorFieldName`: Can be set to customize `Err` field name.
+* `zerolog.TimeFieldFormat`: Can be set to customize `Time` field value formatting. If set with `zerolog.TimeFormatUnix`, `zerolog.TimeFormatUnixMs` or `zerolog.TimeFormatUnixMicro`, times are formated as UNIX timestamp.
+* `zerolog.DurationFieldUnit`: Can be set to customize the unit for time.Duration type fields added by `Dur` (default: `time.Millisecond`).
+* `zerolog.DurationFieldInteger`: If set to `true`, `Dur` fields are formatted as integers instead of floats (default: `false`). 
+* `zerolog.ErrorHandler`: Called whenever zerolog fails to write an event on its output. If not set, an error is printed on the stderr. This handler must be thread safe and non-blocking.
+
+## Field Types
+
+### Standard Types
+
+* `Str`
+* `Bool`
+* `Int`, `Int8`, `Int16`, `Int32`, `Int64`
+* `Uint`, `Uint8`, `Uint16`, `Uint32`, `Uint64`
+* `Float32`, `Float64`
+
+### Advanced Fields
+
+* `Err`: Takes an `error` and renders it as a string using the `zerolog.ErrorFieldName` field name.
+* `Func`: Run a `func` only if the level is enabled.
+* `Timestamp`: Inserts a timestamp field with `zerolog.TimestampFieldName` field name, formatted using `zerolog.TimeFieldFormat`.
+* `Time`: Adds a field with time formatted with `zerolog.TimeFieldFormat`.
+* `Dur`: Adds a field with `time.Duration`.
+* `Dict`: Adds a sub-key/value as a field of the event.
+* `RawJSON`: Adds a field with an already encoded JSON (`[]byte`)
+* `Hex`: Adds a field with value formatted as a hexadecimal string (`[]byte`)
+* `Interface`: Uses reflection to marshal the type.
+
+Most fields are also available in the slice format (`Strs` for `[]string`, `Errs` for `[]error` etc.)
+
+## Binary Encoding
+
+In addition to the default JSON encoding, `zerolog` can produce binary logs using [CBOR](http://cbor.io) encoding. The choice of encoding can be decided at compile time using the build tag `binary_log` as follows:
+
+```bash
+go build -tags binary_log .
+```
+
+To Decode binary encoded log files you can use any CBOR decoder. One has been tested to work
+with zerolog library is [CSD](https://github.com/toravir/csd/).
+
+## Related Projects
+
+* [grpc-zerolog](https://github.com/cheapRoc/grpc-zerolog): Implementation of `grpclog.LoggerV2` interface using `zerolog`
+* [overlog](https://github.com/Trendyol/overlog): Implementation of `Mapped Diagnostic Context` interface using `zerolog`
+* [zerologr](https://github.com/go-logr/zerologr): Implementation of `logr.LogSink` interface using `zerolog`
+
+## Benchmarks
+
+See [logbench](http://hackemist.com/logbench/) for more comprehensive and up-to-date benchmarks.
+
+All operations are allocation free (those numbers *include* JSON encoding):
+
+```text
+BenchmarkLogEmpty-8        100000000    19.1 ns/op     0 B/op       0 allocs/op
+BenchmarkDisabled-8        500000000    4.07 ns/op     0 B/op       0 allocs/op
+BenchmarkInfo-8            30000000     42.5 ns/op     0 B/op       0 allocs/op
+BenchmarkContextFields-8   30000000     44.9 ns/op     0 B/op       0 allocs/op
+BenchmarkLogFields-8       10000000     184 ns/op      0 B/op       0 allocs/op
+```
+
+There are a few Go logging benchmarks and comparisons that include zerolog.
+
+* [imkira/go-loggers-bench](https://github.com/imkira/go-loggers-bench)
+* [uber-common/zap](https://github.com/uber-go/zap#performance)
+
+Using Uber's zap comparison benchmark:
+
+Log a message and 10 fields:
+
+| Library | Time | Bytes Allocated | Objects Allocated |
+| :--- | :---: | :---: | :---: |
+| zerolog | 767 ns/op | 552 B/op | 6 allocs/op |
+| :zap: zap | 848 ns/op | 704 B/op | 2 allocs/op |
+| :zap: zap (sugared) | 1363 ns/op | 1610 B/op | 20 allocs/op |
+| go-kit | 3614 ns/op | 2895 B/op | 66 allocs/op |
+| lion | 5392 ns/op | 5807 B/op | 63 allocs/op |
+| logrus | 5661 ns/op | 6092 B/op | 78 allocs/op |
+| apex/log | 15332 ns/op | 3832 B/op | 65 allocs/op |
+| log15 | 20657 ns/op | 5632 B/op | 93 allocs/op |
+
+Log a message with a logger that already has 10 fields of context:
+
+| Library | Time | Bytes Allocated | Objects Allocated |
+| :--- | :---: | :---: | :---: |
+| zerolog | 52 ns/op | 0 B/op | 0 allocs/op |
+| :zap: zap | 283 ns/op | 0 B/op | 0 allocs/op |
+| :zap: zap (sugared) | 337 ns/op | 80 B/op | 2 allocs/op |
+| lion | 2702 ns/op | 4074 B/op | 38 allocs/op |
+| go-kit | 3378 ns/op | 3046 B/op | 52 allocs/op |
+| logrus | 4309 ns/op | 4564 B/op | 63 allocs/op |
+| apex/log | 13456 ns/op | 2898 B/op | 51 allocs/op |
+| log15 | 14179 ns/op | 2642 B/op | 44 allocs/op |
+
+Log a static string, without any context or `printf`-style templating:
+
+| Library | Time | Bytes Allocated | Objects Allocated |
+| :--- | :---: | :---: | :---: |
+| zerolog | 50 ns/op | 0 B/op | 0 allocs/op |
+| :zap: zap | 236 ns/op | 0 B/op | 0 allocs/op |
+| standard library | 453 ns/op | 80 B/op | 2 allocs/op |
+| :zap: zap (sugared) | 337 ns/op | 80 B/op | 2 allocs/op |
+| go-kit | 508 ns/op | 656 B/op | 13 allocs/op |
+| lion | 771 ns/op | 1224 B/op | 10 allocs/op |
+| logrus | 1244 ns/op | 1505 B/op | 27 allocs/op |
+| apex/log | 2751 ns/op | 584 B/op | 11 allocs/op |
+| log15 | 5181 ns/op | 1592 B/op | 26 allocs/op |
+
+## Caveats
+
+Note that zerolog does no de-duplication of fields. Using the same key multiple times creates multiple keys in final JSON:
+
+```go
+logger := zerolog.New(os.Stderr).With().Timestamp().Logger()
+logger.Info().
+       Timestamp().
+       Msg("dup")
+// Output: {"level":"info","time":1494567715,"time":1494567715,"message":"dup"}
+```
+
+In this case, many consumers will take the last value, but this is not guaranteed; check yours if in doubt.

vendor/github.com/rs/zerolog/_config.yml

@@ -0,0 +1 @@
+remote_theme: rs/gh-readme