144 lines
2.8 KiB
Go
144 lines
2.8 KiB
Go
package redis
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import (
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"context"
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"io"
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"net"
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"strings"
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"github.com/go-redis/redis/v8/internal/pool"
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"github.com/go-redis/redis/v8/internal/proto"
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)
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// ErrClosed performs any operation on the closed client will return this error.
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var ErrClosed = pool.ErrClosed
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type Error interface {
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error
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// RedisError is a no-op function but
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// serves to distinguish types that are Redis
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// errors from ordinary errors: a type is a
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// Redis error if it has a RedisError method.
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RedisError()
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}
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var _ Error = proto.RedisError("")
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func shouldRetry(err error, retryTimeout bool) bool {
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switch err {
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case io.EOF, io.ErrUnexpectedEOF:
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return true
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case nil, context.Canceled, context.DeadlineExceeded:
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return false
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}
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if v, ok := err.(timeoutError); ok {
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if v.Timeout() {
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return retryTimeout
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}
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return true
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}
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s := err.Error()
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if s == "ERR max number of clients reached" {
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return true
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}
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if strings.HasPrefix(s, "LOADING ") {
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return true
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}
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if strings.HasPrefix(s, "READONLY ") {
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return true
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}
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if strings.HasPrefix(s, "CLUSTERDOWN ") {
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return true
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}
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if strings.HasPrefix(s, "TRYAGAIN ") {
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return true
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}
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return false
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}
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func isRedisError(err error) bool {
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_, ok := err.(proto.RedisError)
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return ok
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}
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func isBadConn(err error, allowTimeout bool, addr string) bool {
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switch err {
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case nil:
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return false
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case context.Canceled, context.DeadlineExceeded:
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return true
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}
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if isRedisError(err) {
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switch {
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case isReadOnlyError(err):
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// Close connections in read only state in case domain addr is used
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// and domain resolves to a different Redis Server. See #790.
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return true
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case isMovedSameConnAddr(err, addr):
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// Close connections when we are asked to move to the same addr
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// of the connection. Force a DNS resolution when all connections
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// of the pool are recycled
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return true
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default:
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return false
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}
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}
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if allowTimeout {
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if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
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return !netErr.Temporary()
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}
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}
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return true
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}
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func isMovedError(err error) (moved bool, ask bool, addr string) {
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if !isRedisError(err) {
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return
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}
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s := err.Error()
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switch {
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case strings.HasPrefix(s, "MOVED "):
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moved = true
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case strings.HasPrefix(s, "ASK "):
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ask = true
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default:
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return
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}
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ind := strings.LastIndex(s, " ")
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if ind == -1 {
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return false, false, ""
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}
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addr = s[ind+1:]
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return
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}
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func isLoadingError(err error) bool {
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return strings.HasPrefix(err.Error(), "LOADING ")
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}
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func isReadOnlyError(err error) bool {
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return strings.HasPrefix(err.Error(), "READONLY ")
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}
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func isMovedSameConnAddr(err error, addr string) bool {
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redisError := err.Error()
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if !strings.HasPrefix(redisError, "MOVED ") {
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return false
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}
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return strings.HasSuffix(redisError, addr)
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}
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//------------------------------------------------------------------------------
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type timeoutError interface {
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Timeout() bool
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}
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