log

README

说明

本logger主要是对zap库的封装，便于使用。当然也可以根据接口使用其他日志库，比如 logrus。

日志功能

• 将日志信息记录到日志文件里
• 日志切割-能够根据日志文件大小或时间间隔进行切割
• 支持不同的日志级别(eg：info,debug,warn,error,fatal)
• 支持按日志级别分类输出到不同日志文件
• 能够打印基本信息，如调用文件/函数名和行号，日志时间，IP等

使用方法

log.Info("user_id is 1")
log.Warn("user is not exist")
log.Error("params error")

log.Warnf("params is empty")
...

原则

日志尽量不要在 model, repository, service中打印输出，最好使用 errors.Wrapf 将错误和消息返回到上层，然后在 handler 层中处理错误， 也就是通过日志打印出来。

这样做的好处是：避免相同日志在多个地方打印，让排查问题更简单。

Reference

• 日志基础库 zap: https://github.com/uber-go/zap
• 日志分割库-按时间：https://github.com/lestrrat-go/file-rotatelogs
• 日志分割库-按大小：https://github.com/natefinch/lumberjack
• 深度 | 从Go高性能日志库zap看如何实现高性能Go组件
• Logger interface for GO with zap and logrus implementation
• https://github.com/wzyonggege/logger
• https://wisp888.github.io/golang-iris-%E5%AD%A6%E4%B9%A0%E4%BA%94-zap%E6%97%A5%E5%BF%97.html
• https://www.mountedthoughts.com/golang-logger-interface/

Documentation

Overview

span logger for trace reference: https://github.com/jaegertracing/jaeger/tree/master/examples/hotrod/pkg/log

Index

• Constants
• func Debug(args ...interface{})
• func Debugf(format string, args ...interface{})
• func Error(args ...interface{})
• func Errorf(format string, args ...interface{})
• func Fatal(args ...interface{})
• func Fatalf(format string, args ...interface{})
• func Info(args ...interface{})
• func Infof(format string, args ...interface{})
• func Panicf(format string, args ...interface{})
• func Warn(args ...interface{})
• func Warnf(format string, args ...interface{})
• type Config
• type Fields
• type Logger
  • func GetLogger() Logger
  • func Init(cfg *Config) Logger
  • func WithContext(ctx context.Context) Logger
  • func WithFields(keyValues Fields) Logger

Constants

const (
	// WriterConsole console输出
	WriterConsole = "console"
	// WriterFile 文件输出
	WriterFile = "file"
)

const (
	// RotateTimeDaily 按天切割
	RotateTimeDaily = "daily"
	// RotateTimeHourly 按小时切割
	RotateTimeHourly = "hourly"
)

Functions

func Debug

func Debug(args ...interface{})

Debug logger

func Debugf

func Debugf(format string, args ...interface{})

Debugf logger

func Error

func Error(args ...interface{})

Error logger

func Errorf

func Errorf(format string, args ...interface{})

Errorf logger

func Fatal

func Fatal(args ...interface{})

Fatal logger

func Fatalf

func Fatalf(format string, args ...interface{})

Fatalf logger

func Info

func Info(args ...interface{})

Info logger

func Infof

func Infof(format string, args ...interface{})

Infof logger

func Panicf

func Panicf(format string, args ...interface{})

Panicf logger

func Warn

func Warn(args ...interface{})

Warn logger

func Warnf

func Warnf(format string, args ...interface{})

Warnf logger

Types

type Config

type Config struct {
	Development       bool
	DisableCaller     bool
	DisableStacktrace bool
	Encoding          string
	Level             string
	Name              string
	Writers           string
	LoggerFile        string
	LoggerWarnFile    string
	LoggerErrorFile   string
	LogFormatText     bool
	LogRollingPolicy  string
	LogRotateDate     int
	LogRotateSize     int
	LogBackupCount    uint
}

Logger config

type Fields

type Fields map[string]interface{}

Fields Type to pass when we want to call WithFields for structured logging

type Logger

type Logger interface {
	Debug(args ...interface{})
	Debugf(format string, args ...interface{})

	Info(args ...interface{})
	Infof(format string, args ...interface{})

	Warn(args ...interface{})
	Warnf(format string, args ...interface{})

	Error(args ...interface{})
	Errorf(format string, args ...interface{})

	Fatal(args ...interface{})
	Fatalf(format string, args ...interface{})

	Panicf(format string, args ...interface{})

	WithFields(keyValues Fields) Logger
}

Logger is our contract for the logger

func GetLogger

func GetLogger() Logger

func Init

func Init(cfg *Config) Logger

Init init log

func WithContext

func WithContext(ctx context.Context) Logger

Trace is a logger that can log msg and log span for trace

func WithFields

func WithFields(keyValues Fields) Logger

WithFields logger output more field, eg:

contextLogger := log.WithFields(log.Fields{"key1": "value1"})
contextLogger.Info("print multi field")

or more sample to use:

log.WithFields(log.Fields{"key1": "value1"}).Info("this is a test log")
log.WithFields(log.Fields{"key1": "value1"}).Infof("this is a test log, user_id: %d", userID)