Introduction

BLog4go is an efficient logging library written in the Go programming language, providing logging hook, log rotate, filtering and formatting log message.

BLog4go 是高性能日志库。创新地使用“边解析边输出”方法进行日志输出，同时支持回调函数、日志淘汰和配置文件。可以解决高并发，调用日志函数频繁的情境下，日志库造成的性能问题。

Features

• Partially write to the bufio.Writer as soon as posible while formatting message to improve performance
• Support different logging output file for different logging level
• Support configure with files in xml format
• Configurable logrotate strategy
• Call user defined hook in asynchronous mode for every logging action
• Adjustable message formatting
• Configurable logging behavier when logging on the fly without restarting
• Suit configuration to the environment when logging start
• Try best to get every done in background
• File writer can be configured according to given config file
• Different output writers
  • Console writer
  • File writer
  • Socket writer

Quick-start

package main

import (
    log "github.com/YoungPioneers/blog4go"
    "fmt"
    "os"
)

// optionally set user defined hook for logging
type MyHook struct {
    something string
}

// when log-level exceed level, call the hook
// level is the level associate with that logging action.
// message is the formatted string already written.
func (self *MyHook) Fire(level log.LevelType, args ...interface{}) {
    fmt.Println(args...)
}

func main() {
    // init a file write using xml config file
    // log.SetBufferSize(0) // close buffer for in time logging when debugging
    err := log.NewWriterFromConfigAsFile("config.xml")
    if nil != err {
        fmt.Println(err.Error())
        os.Exit(1)
    }
    defer log.Close()

    // initialize your hook instance
    hook := new(MyHook)
    log.SetHook(hook) // writersFromConfig can be replaced with writers
    log.SetHookLevel(log.INFO)
    log.SetHookAsync(true) // hook will be called in async mode

    // optionally set output colored
    log.SetColored(true)

    log.Debugf("Good morning, %s", "eddie")
    log.Warn("It's time to have breakfast")
}

config.xml

<blog4go minlevel="info">
    <filter levels="trace">
        <rotatefile path="trace.log" type="time"></rotatefile>
    </filter>
    <filter levels="debug,info" colored="true">
        <file path="debug.log"></file>
    </filter>
    <filter levels="error,critical">
        <rotatefile path="error.log" type="size" rotateSize="50000000" rotateLines="8000000"></rotatefile>
    </filter>
</blog4go>

Installation

If you don't have the Go development environment installed, visit the Getting Started document and follow the instructions. Once you're ready, execute the following command:

go get -u github.com/YoungPioneers/blog4go

Benchmark

I do some benchmark on a SSD disk with my macbook pro comparing amoung fmt,blog4go,seelog,logrus. Benchmark Code

BenchmarkBlog4goSingleGoroutine-4                        300000          4981 ns/op
BenchmarkBlog4goMultiGoroutine-4                           3000        554542 ns/op
BenchmarkFmtFormatSingleGoroutine-4                      300000          3727 ns/op
BenchmarkFmtFormatWithTimecacheSingleGoroutine-4         500000          2951 ns/op
BenchmarkFmtFormatWithTimecacheMultiGoroutine-4            3000        421204 ns/op
BenchmarkLogrusSingleGoroutine-4                         100000         18652 ns/op
BenchmarkLogrusWithTimecacheSingleGoroutine-4            100000         16024 ns/op
BenchmarkLogrusWithTimecacheMultiGoroutine-4                500       2238614 ns/op
BenchmarkSeelogSingleGoroutine-4                          50000         23476 ns/op
BenchmarkSeelogMultiGoroutine-4                             500       2722851 ns/op

It shows that blog4go can write log very fast, especially in situation with multi goroutines running at the same time~

Documentation

TODO

Examples

Full examples please view EXAMPLES

Changelog

CHANGELOG