1. 日志切割归档

1.1.1. 使用Lumberjack进行日志切割归档

这个日志程序中唯一缺少的就是日志切割归档功能。

Zap本身不支持切割归档日志文件

为了添加日志切割归档功能,我们将使用第三方库Lumberjack来实现。

1.1.2. 安装

执行下面的命令安装Lumberjack

    go get -u github.com/natefinch/lumberjack

1.1.3. zap logger中加入Lumberjack

要在zap中加入Lumberjack支持,我们需要修改WriteSyncer代码。我们将按照下面的代码修改getLogWriter()函数:

func getLogWriter() zapcore.WriteSyncer {
    lumberJackLogger := &lumberjack.Logger{
        Filename:   "./test.log",
        MaxSize:    10,
        MaxBackups: 5,
        MaxAge:     30,
        Compress:   false,
    }
    return zapcore.AddSync(lumberJackLogger)
}

Lumberjack Logger采用以下属性作为输入:

  • Filename: 日志文件的位置
  • MaxSize:在进行切割之前,日志文件的最大大小(以MB为单位)
  • MaxBackups:保留旧文件的最大个数
  • MaxAges:保留旧文件的最大天数
  • Compress:是否压缩/归档旧文件

1.1.4. 测试所有功能

最终,使用Zap/Lumberjack logger的完整示例代码如下:

package main

import (
    "net/http"

    "github.com/natefinch/lumberjack"
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
)

var sugarLogger *zap.SugaredLogger

func main() {
    InitLogger()
    defer sugarLogger.Sync()
    simpleHttpGet("www.5lmh.com")
    simpleHttpGet("http://www.5lmh.com")
}

func InitLogger() {
    writeSyncer := getLogWriter()
    encoder := getEncoder()
    core := zapcore.NewCore(encoder, writeSyncer, zapcore.DebugLevel)

    logger := zap.New(core, zap.AddCaller())
    sugarLogger = logger.Sugar()
}

func getEncoder() zapcore.Encoder {
    encoderConfig := zap.NewProductionEncoderConfig()
    encoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
    encoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
    return zapcore.NewConsoleEncoder(encoderConfig)
}

func getLogWriter() zapcore.WriteSyncer {
    lumberJackLogger := &lumberjack.Logger{
        Filename:   "./test.log",
        MaxSize:    1,
        MaxBackups: 5,
        MaxAge:     30,
        Compress:   false,
    }
    return zapcore.AddSync(lumberJackLogger)
}

func simpleHttpGet(url string) {
    sugarLogger.Debugf("Trying to hit GET request for %s", url)
    resp, err := http.Get(url)
    if err != nil {
        sugarLogger.Errorf("Error fetching URL %s : Error = %s", url, err)
    } else {
        sugarLogger.Infof("Success! statusCode = %s for URL %s", resp.Status, url)
        resp.Body.Close()
    }
}

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