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package main
import (
"os"
"github.com/op/go-logging"
)
var log = logging.MustGetLogger("example")
// Example format string. Everything except the message has a custom color
// which is dependent on the log level. Many fields have a custom output
// formatting too, eg. the time returns the hour down to the milli second.
var format = logging.MustStringFormatter(
`%{color}%{time:15:04:05.000} %{shortfunc} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}`,
)
// Password is just an example type implementing the Redactor interface. Any
// time this is logged, the Redacted() function will be called.
type Password string
func (p Password) Redacted() interface{} {
return logging.Redact(string(p))
}
func main() {
// For demo purposes, create two backend for os.Stderr.
backend1 := logging.NewLogBackend(os.Stderr, "", 0)
backend2 := logging.NewLogBackend(os.Stderr, "", 0)
// For messages written to backend2 we want to add some additional
// information to the output, including the used log level and the name of
// the function.
backend2Formatter := logging.NewBackendFormatter(backend2, format)
// Only errors and more severe messages should be sent to backend1
backend1Leveled := logging.AddModuleLevel(backend1)
backend1Leveled.SetLevel(logging.ERROR, "")
// Set the backends to be used.
logging.SetBackend(backend1Leveled, backend2Formatter)
log.Debugf("debug %s", Password("secret"))
log.Info("info")
log.Notice("notice")
log.Warning("warning")
log.Error("err")
log.Critical("crit")
}
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