go-log

package main

import (
	"os"
	"errors"
	log "github.com/fangdingjun/go-log"
)

func main() {
	log.Debugf("app = %s", os.Args[0])
	log.Errorf("error = %v", errors.New("some error"))

	// dynamic set level
	log.Default.Level = log.WARN

	log.Debug("cannot output debug message")
	log.Errorln("can output error message", errors.New("some error"))
}

import (
	log "github.com/fangdingjun/go-log"
)

log.Default.Out = &log.FixedSizeFileWriter{
	Name:	 "/tmp/test.log",
	MaxSize:  10 * 1024 * 1024, // 10m
	MaxCount: 10,
})

// Create log file if file size large than fixed size (10m)
// files: /tmp/test.log.0 .. test.log.10
&log.FixedSizeFileWriter{
	Name:	 "/tmp/test.log",
	MaxSize:  10 * 1024 * 1024, // 10m
	MaxCount: 10,
}

// Create log file every day.
// files: /tmp/test.log.20160102
&log.DailyFileWriter{
	Name: "/tmp/test.log",
	MaxCount: 10,
}

// Create log file every process.
// files: /tmp/test.log.20160102_150405
&log.AlwaysNewFileWriter{
	Name: "/tmp/test.log",
	MaxCount: 10,
}

// Output to multiple writes
io.MultiWriter(
	os.Stdout,
	&log.DailyFileWriter{
		Name: "/tmp/test.log",
		MaxCount: 10,
	}
	//...
)

import (
	log "github.com/fangdingjun/go-log"
)

log.Default.Formatter = new(log.TextFormatter)

import (
	log "github.com/fangdingjun/go-log"
)

func main() {
	logger := &log.Logger{
		Level:     log.INFO,
		Formatter: new(log.JSONFormatter),
		Out:       os.Stdout,
	}

	logger.Infof("i = %d", 99)
}