log

log is a logging framework of Go. see API.

Features

• light weight
• easy to use
• level logging support
• flexible

Quick Start

Installation

go get github.com/imroc/log

Simple Usage

import (
	"github.com/imroc/log"
)

func main() {
    // DEBUG < INFO < WARN < ERROR < FATAL
    log.SetLevel(log.WARN) // level DEBUG and INFO will not output
	log.Debug("this is a %s message", "debug")
	log.Info("this is a %s message", "info")
	log.Warn("this is a %s message", "warn")
	log.Error("this is a %s message", "error")
	log.Fatal("this is a %s message", "fatal")
}

output:

2016/10/04 14:38:38 WARN this is a warn message
2016/10/04 14:38:38 EROR this is a error message
2016/10/04 14:38:38 FATL this is a fatal message

More Control

file, _ := os.OpenFile("test.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
log.Set(log.INFO, file, log.Llongfile|log.LstdFlags)
log.Debug("this is a %s message", "debug")
log.Info("this is a %s message", "info")
log.Warn("this is a %s message", "warn")
log.Error("this is a %s message", "error")
log.Fatal("this is a %s message", "fatal")

output to test.log:

2016/10/04 15:04:00 INFO /home/cpwl/go/lib/src/github.com/imroc/sub/test.go:13: this is a info message
2016/10/04 15:04:00 WARN /home/cpwl/go/lib/src/github.com/imroc/sub/test.go:14: this is a warn message
2016/10/04 15:04:00 EROR /home/cpwl/go/lib/src/github.com/imroc/sub/test.go:15: this is a error message
2016/10/04 15:04:00 FATL /home/cpwl/go/lib/src/github.com/imroc/sub/test.go:16: this is a fatal message

LICENSE

log is is distributed under the terms of the MIT License.