golog

Simple logging library for Golang.

Installation

go get -u github.com/dafengge0913/golog

Quick start

package main

import "golog"

func main() {
	log := golog.NewLogger(golog.LevelDebug)
	log.Debug("Debug msg")
	log.Info("Info msg, id=%d, name=%s", 1, "dfg")
	log.Warn("Warn msg")
	log.Error("Error msg")
}

Output

Color

Supported in Windows and Linux for now, this feature could be canceled by this setting :

log.SetPrintColor(false)

and also could be activate anytime you want by set this to true.

File path

File path and line number are optional, if you don't want this, do that :

log.SetPrintPath(false)

Write to File

package main

import (
	"time"
	"golog"
)

func main() {
	writeCfg := golog.NewLogWriterConfig()
	// cache size of chan
	writeCfg.SetCacheSize(1024)
	// interval of flush to disk
	writeCfg.SetSaveInterval(time.Second * 5)
	// format date as a suffix to log file name when rotate
	writeCfg.SetDateFormat("2006@01@02")
	writer, err := golog.NewLogWriterFile(golog.LevelInfo, "D:/dfg", "demo_log", true, writeCfg)
	if err != nil {
		panic(err)
	}
	// only log error
	errWriter, err := golog.NewLogWriterFile(golog.LevelError, "D:/dfg", "demo_log_error", false, nil)
	if err != nil {
		panic(err)
	}
	log := golog.NewLogger(golog.LevelInfo, writer, errWriter)
	for i := 0; i < 100; i++ {
		log.Info("info i=%d", i)
		if i%10 == 0 {
			log.Error("error i=%d", i)
		}
	}
	// !! important
	log.Close()
}

You can create a file writer by call golog.NewLogWriterFile. For performance purpose, LogWriterFile is an asynchronous log recorder. When you spawn log message, it will be temporary stored in a chan, and flush to disk by a goroutine later. So it's important to call Close() before your application exit, make sure all message has been flushed in disk.

If you use all default settings for LogWriterFile, there is no need to create a logWriterConfig, you can just pass a nil like this :

writer, err := NewLogWriterFile(LevelDebug, "D:/dfg", "demo_log", true, nil)

License

Under the MIT License .