70 lines
1.3 KiB
Go
70 lines
1.3 KiB
Go
package netlink
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import (
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"fmt"
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"log"
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"os"
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"strconv"
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"strings"
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)
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// Arguments used to create a debugger.
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var debugArgs []string
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func init() {
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// Is netlink debugging enabled?
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s := os.Getenv("NLDEBUG")
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if s == "" {
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return
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}
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debugArgs = strings.Split(s, ",")
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}
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// A debugger is used to provide debugging information about a netlink connection.
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type debugger struct {
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Log *log.Logger
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Level int
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}
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// newDebugger creates a debugger by parsing key=value arguments.
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func newDebugger(args []string) *debugger {
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d := &debugger{
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Log: log.New(os.Stderr, "nl: ", 0),
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Level: 1,
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}
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for _, a := range args {
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kv := strings.Split(a, "=")
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if len(kv) != 2 {
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// Ignore malformed pairs and assume callers wants defaults.
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continue
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}
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switch kv[0] {
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// Select the log level for the debugger.
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case "level":
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level, err := strconv.Atoi(kv[1])
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if err != nil {
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panicf("netlink: invalid NLDEBUG level: %q", a)
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}
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d.Level = level
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}
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}
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return d
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}
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// debugf prints debugging information at the specified level, if d.Level is
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// high enough to print the message.
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func (d *debugger) debugf(level int, format string, v ...interface{}) {
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if d.Level >= level {
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d.Log.Printf(format, v...)
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}
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}
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func panicf(format string, a ...interface{}) {
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panic(fmt.Sprintf(format, a...))
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}
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