Package logging implements a logging infrastructure for Go. It supports different logging backends like syslog, file and memory. Multiple backends can be utilized with different log levels per backend and logger.

$ go get github.com/op/go-logging

After this command go-logging is ready to use. Its source will be in:

$GOROOT/src/pkg/github.com/op/go-logging

You can use go get -u -a to update all installed packages.

package main

import "github.com/op/go-logging"

var log = logging.MustGetLogger("package.example")

func main() {
	logging.SetLevel(logging.INFO, "package.example")
	log.Debug("hello %s", "golang")
	log.Info("hello %s", "golang")
}

Examples are found in examples/. For docs, see http://godoc.org/github.com/op/go-logging or run:

$ go doc github.com/op/go-logging