https://github.com/uber-go/zap
Zap是非常快的、结构化的，分日志级别的Go日志库。是现在的主流, 没有用反射
https://github.com/wangshibiaoFlytiger/apiproject/tree/master/log

1 安装

go get -u go.uber.org/zap

2 如何输出日志

  1. package main
  3. import "go.uber.org/zap"
  5. func main() {
  6.     // 开发环境
  7.     logger1, _ := zap.NewDevelopment()  
  9.     defer logger1.Sync()
  11.     logger1.Info("failed to fetch URL",
  12.         zap.String("url", "https://imooc.com"),
  13.         zap.Int("attempt", 3))  // 2021-11-16T10:58:24.906+0800    INFO    zap_test/main.go:9      failed to fetch URL     {"url": "https://imooc.com", "attempt": 3}
  16.     // 生产环境
  17.     logger2, _ := zap.NewProduction()  
  18.     defer logger2.Sync()
  20.     // 普通logger2
  21.     logger2.Info("failed to fetch URL",
  22.         zap.String("url", "https://imooc.com"),
  23.         zap.Int("attempt", 3))  // {"level":"info","ts":1637031504.9066734,"caller":"zap_test/main.go:17","msg":"failed to fetch URL","url":"https://imooc.com","attempt":3}
  25.     // 使用语法糖
  26.     sugar := logger2.Sugar()
  27.     sugar.Infow("failed to fetch URL",
  28.         "url", "https://imooc.com",
  29.         "attempt", 3)  // {"level":"info","ts":1637031504.9067116,"caller":"zap_test/main.go:23","msg":"failed to fetch URL","url":"https://imooc.com","attempt":3}
  31. }

3 日志输出到文件

  1. package main
  3. import (
  4.     "go.uber.org/zap"
  5.     "time"
  6. )
  8. func NewLogger() (*zap.Logger, error)  {
  9.     cfg := zap.NewProductionConfig()
  10.     cfg.OutputPaths = []string {
  11.         "./info.log",
  12.     }
  13.     return cfg.Build()
  14. }
  16. func main() {
  17.     logger, err := NewLogger()
  18.     if err != nil {
  19.         panic(err)
  20.     }
  21.     su := logger.Sugar()
  22.     defer su.Sync()
  24.     su.Info("failed to fetch URL",
  25.         "url", "https://immoc.com",
  26.         "attempt", 3,
  27.         "backoff", time.Second,
  28.         )
  29. }

4 封装

  1. package zlog
  3. // 简单封装一下对 zap 日志库的使用
  4. // 使用方式：
  5. // zlog.Debug("hello", zap.String("name", "Kevin"), zap.Any("arbitraryObj", dummyObject))
  6. // zlog.Info("hello", zap.String("name", "Kevin"), zap.Any("arbitraryObj", dummyObject))
  7. // zlog.Warn("hello", zap.String("name", "Kevin"), zap.Any("arbitraryObj", dummyObject))
  8. var logger *zap.Logger
  10. func init() {
  11.     ......
  12. }
  14. func getFileLogWriter() (writeSyncer zapcore.WriteSyncer) {
  15.     ......
  16. }
  18. func Info(message string, fields ...zap.Field) {
  19.     callerFields := getCallerInfoForLog()
  20.     fields = append(fields, callerFields...)
  21.     logger.Info(message, fields...)
  22. }
  24. func Debug(message string, fields ...zap.Field) {
  25.     callerFields := getCallerInfoForLog()
  26.     fields = append(fields, callerFields...)
  27.     logger.Debug(message, fields...)
  28. }
  30. func Error(message string, fields ...zap.Field) {
  31.     callerFields := getCallerInfoForLog()
  32.     fields = append(fields, callerFields...)
  33.     logger.Error(message, fields...)
  34. }
  36. func Warn(message string, fields ...zap.Field) {
  37.     callerFields := getCallerInfoForLog()
  38.     fields = append(fields, callerFields...)
  39.     logger.Warn(message, fields...)
  40. }
  42. func getCallerInfoForLog() (callerFields []zap.Field) {
  44.     pc, file, line, ok := runtime.Caller(2) // 回溯两层，拿到写日志的调用方的函数信息
  45.     if !ok {
  46.         return
  47.     }
  48.     funcName := runtime.FuncForPC(pc).Name()
  49.     funcName = path.Base(funcName) //Base函数返回路径的最后一个元素，只保留函数名
  51.     callerFields = append(callerFields, zap.String("func", funcName), zap.String("file", file), zap.Int("line", line))
  52.     return
  53. }