package logging provides a simple logger with level and log rotation for Go. Getting Started

package main

import (
	"fmt"
	log "github.com/justgolang/logging"
	"time"
)

func main() {
	path := "/home/mckee/program/go/src/test/logs/access.log"
	if err := log.Setup(path, log.LevelDebug, log.MinutelyRotate); err != nil {
		fmt.Print(err)
		return
	}
	defer func() {
		log.Close()
	}()

	log.Debug("ddd")
	log.Debugf("ddd%d", 444)
	log.Info("aaa")
	log.Infof("aaa%d", 111)

	for i := 0; i < 100; i++ {
		log.Infof("log at: %d", i)
		time.Sleep(1000 * 1000 * 1000)
	}

	//will no show
	log.SetLevel(log.LevelError)
	log.Warn("bbb")
	log.Warnf("bbb%d", 222)

	//will show
	log.Error("ccc")
	log.Errorf("ccc%d", 333)

	//will exit
	log.Fatal("eee")

	//will not show
	log.Fatalf("eee%d", 555)
}

By executing the code above, that is rotate minutely, you will get output like this:

2016-04-10 22:41:31 ▶ DEB ddd
2016-04-10 22:41:31 ▶ DEB ddd444
2016-04-10 22:41:31 ▶ INF aaa
2016-04-10 22:41:31 ▶ INF aaa111
......
2016-04-10 22:43:10 ▶ INF log at: 99
2016-04-10 22:43:11 ▶ ERR ccc
2016-04-10 22:43:11 ▶ ERR ccc333
2016-04-10 22:43:11 ▶ FAT eee

and will generate at least two files: access.log as current log file, access.log-2006-01-02_15-04 as backup log file. Features

• Logging in File with rotation
• Logging with levels
• Enable/disable Logger
• Automatic word wrapping

Levels

• Debug
• Info
• Warn
• Error
• Fatal (in this case program will exit)

RotateRules

• MonthlyRotate (rotate the logs monthly)
• DailyRotate (rotate the logs daily)
• HourlyRotate (rotate the logs hourly)
• MinutelyRotate (rotate the logs minutely)

Installation

go get github.com/justgolang/logging
use go get -u to update the package.