深入浅析golang zap 日志库使用（含文件切割、分级别存储和全局使用等）

infoLevel := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
 return lvl >= zapcore.InfoLevel
})

errorLevel := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
 return lvl >= zapcore.ErrorLevel
})

infoWriter := getWriter("./logs/demo_info.log")
errorWriter := getWriter("./logs/demo_error.log")

func getWriter(filename string) io.Writer {
 // 生成rotatelogs的Logger 实际生成的文件名 demo.log.YYmmddHH
 // demo.log是指向最新日志的链接
 // 保存7天内的日志，每1小时(整点)分割一次日志
 hook, err := rotatelogs.New(
 strings.Replace(filename, ".log", "", -1)+"-%Y%m%d%H.log", // 没有使用go风格反人类的format格式
 //rotatelogs.WithLinkName(filename),
 //rotatelogs.WithMaxAge(time.Hour*24*7),
 //rotatelogs.WithRotationTime(time.Hour),
 )

 if err != nil {
 panic(err)
 }
 return hook
}

core := zapcore.NewTee(
 zapcore.NewCore(encoder, zapcore.AddSync(infoWriter), infoLevel),
 zapcore.NewCore(encoder, zapcore.AddSync(errorWriter), errorLevel),
)

log := zap.New(core, zap.AddCaller()) 
errorLogger = log.Sugar()

func Debug(args ...interface{}) {
 errorLogger.Debug(args...)
}
func Debugf(template string, args ...interface{}) {
 errorLogger.Debugf(template, args...)
}
func Info(args ...interface{}) {
 errorLogger.Info(args...)
}
func Infof(template string, args ...interface{}) {
 errorLogger.Infof(template, args...)
}
func Warn(args ...interface{}) {
 errorLogger.Warn(args...)
}
func Warnf(template string, args ...interface{}) {
 errorLogger.Warnf(template, args...)
}
func Error(args ...interface{}) {
 errorLogger.Error(args...)
}
func Errorf(template string, args ...interface{}) {
 errorLogger.Errorf(template, args...)
}
func DPanic(args ...interface{}) {
 errorLogger.DPanic(args...)
}
func DPanicf(template string, args ...interface{}) {
 errorLogger.DPanicf(template, args...)
}

package logger
import (
 rotatelogs "github.com/lestrrat-go/file-rotatelogs"
 "go.uber.org/zap"
 "go.uber.org/zap/zapcore"
 "io"
 "strings"
 "time"
)
var errorLogger *zap.SugaredLogger
func init(){
 // 设置一些基本日志格式 具体含义还比较好理解，直接看zap源码也不难懂
 encoder := zapcore.NewConsoleEncoder(zapcore.EncoderConfig{
 MessageKey: "msg",
 LevelKey: "level",
 EncodeLevel: zapcore.CapitalLevelEncoder,
 TimeKey: "ts",
 EncodeTime: func(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
  enc.AppendString(t.Format("2006-01-02 15:04:05"))
 },
 CallerKey: "file",
 EncodeCaller: zapcore.ShortCallerEncoder,
 EncodeDuration: func(d time.Duration, enc zapcore.PrimitiveArrayEncoder) {
  enc.AppendInt64(int64(d) / 1000000)
 },
 })
 // 实现两个判断日志等级的interface
 infoLevel := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
 return lvl >= zapcore.InfoLevel
 })
 errorLevel := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
 return lvl >= zapcore.ErrorLevel
 })
 // 获取 info、error日志文件的io.Writer 抽象 getWriter() 在下方实现
 infoWriter := getWriter("./logs/demo_info.log")
 errorWriter := getWriter("./logs/demo_error.log")
 // 最后创建具体的Logger
 core := zapcore.NewTee(
 zapcore.NewCore(encoder, zapcore.AddSync(infoWriter), infoLevel),
 zapcore.NewCore(encoder, zapcore.AddSync(errorWriter), errorLevel),
 )
 log := zap.New(core, zap.AddCaller()) // 需要传入 zap.AddCaller() 才会显示打日志点的文件名和行数, 有点小坑
 errorLogger = log.Sugar()
}
func getWriter(filename string) io.Writer {
 // 生成rotatelogs的Logger 实际生成的文件名 demo.log.YYmmddHH
 // demo.log是指向最新日志的链接
 // 保存7天内的日志，每1小时(整点)分割一次日志
 hook, err := rotatelogs.New(
 strings.Replace(filename, ".log", "", -1)+"-%Y%m%d%H.log", // 没有使用go风格反人类的format格式
 //rotatelogs.WithLinkName(filename),
 //rotatelogs.WithMaxAge(time.Hour*24*7),
 //rotatelogs.WithRotationTime(time.Hour),
 )
 if err != nil {
 panic(err)
 }
 return hook
}
func Debug(args ...interface{}) {
 errorLogger.Debug(args...)
}
func Debugf(template string, args ...interface{}) {
 errorLogger.Debugf(template, args...)
}
func Info(args ...interface{}) {
 errorLogger.Info(args...)
}
func Infof(template string, args ...interface{}) {
 errorLogger.Infof(template, args...)
}
func Warn(args ...interface{}) {
 errorLogger.Warn(args...)
}
func Warnf(template string, args ...interface{}) {
 errorLogger.Warnf(template, args...)
}
func Error(args ...interface{}) {
 errorLogger.Error(args...)
}
func Errorf(template string, args ...interface{}) {
 errorLogger.Errorf(template, args...)
}
func DPanic(args ...interface{}) {
 errorLogger.DPanic(args...)
}
func DPanicf(template string, args ...interface{}) {
 errorLogger.DPanicf(template, args...)
}
func Panic(args ...interface{}) {
 errorLogger.Panic(args...)
}
func Panicf(template string, args ...interface{}) {
 errorLogger.Panicf(template, args...)
}
func Fatal(args ...interface{}) {
 errorLogger.Fatal(args...)
}
func Fatalf(template string, args ...interface{}) {
 errorLogger.Fatalf(template, args...)
}

import (
 "flag"
 "goAuth/logger"
 "goAuth/util"
 "os"
)

func main() {
 createAndCheckToken()
 logger.Infof("in main args:%v", os.Args)
 logger.Errorf("eerror %v", "error")
 flag.Parse()
 logger.Infof("env is %v", *env)
 config := util.InitConfig( "./config/" + *env + ".conf")
 ip := config["ip"]
 port := config["port"]
 envConfig := config["env"]
 logger.Infof("ip=%v, port=%v, env=%v", ip, port, envConfig)
}