Go的日志库

Go-logging

配置文件config.yaml

log:
  prefix: '[MY-LOG] '
  log-file: true
  stdout: 'DEBUG'
  file: 'DEBUG'

config/config.go

package config

type Log struct {
	Prefix  string `mapstructure:"prefix" json:"prefix"`
	LogFile bool   `mapstructure:"log-file" json:"logFile"`
	Stdout  string `mapstructure:"stdout" json:"stdout"`
	File    string `mapstructure:"file" json:"file"`
}

type Config struct {
	Log Log `json:"log"`
}

global/global.go

package global

import (
	oplogging "github.com/op/go-logging"
	"github.com/spf13/viper"
	"go_Logger/config"
)

var (
	CONFIG config.Config
	VP     *viper.Viper
	LOG    *oplogging.Logger
)

读取配置文件

//const defaultConfigFile = "config/config.json"
const defaultConfigFile = "config/config.yaml"

func init() {
	v := viper.New()
	v.SetConfigFile(defaultConfigFile)
	err := v.ReadInConfig()
	if err != nil {
		panic(fmt.Errorf("Fatal error config file: %s 
", err))
	}
	v.WatchConfig()

	v.OnConfigChange(func(e fsnotify.Event) {
		fmt.Println("config file changed:", e.Name)
		if err := v.Unmarshal(&global.CONFIG); err != nil {
			fmt.Println(err)
		}
	})
	if err := v.Unmarshal(&global.CONFIG); err != nil {
		fmt.Println(err)
	}
	global.VP = v
}

initizlize/go-logging.go

package initizlize

import (
	"fmt"
	rotatelogs "github.com/lestrrat/go-file-rotatelogs"
	oplogging "github.com/op/go-logging"
	"go_Logger/config"
	"go_Logger/global"
	"go_Logger/utils"
	"io"
	"os"
	"strings"
	"time"
)

const (
	logDir      = "log"
	logSoftLink = "latest_log"
	module      = "go_Logger"
)

var (
	defaultFormatter = `%{color}%{time:2006/01/02 - 15:04:05.000} %{longfile} %{color:bold}▶ [%{level:.6s}] %{message}%{color:reset}`
)

func InitGlobalLog() {
	c := global.CONFIG.Log
	if c.Prefix == "" {
		_ = fmt.Errorf("logger prefix not found")
	}
	logger := oplogging.MustGetLogger(module)
	var backends []oplogging.Backend
	backends = registerStdout(c, backends)
	backends = registerFile(c, backends)

	oplogging.SetBackend(backends...)
	global.LOG = logger
}

func registerStdout(c config.Log, backends []oplogging.Backend) []oplogging.Backend {
	if c.Stdout != "" {
		level, err := oplogging.LogLevel(c.Stdout)
		if err != nil {
			fmt.Println(err)
		}
		backends = append(backends, createBackend(os.Stdout, c, level))
	}

	return backends
}

func registerFile(c config.Log, backends []oplogging.Backend) []oplogging.Backend {
	if c.File != "" {
		if ok, _ := utils.PathExists(logDir); !ok {
			// directory not exist
			fmt.Println("create log directory")
			_ = os.Mkdir(logDir, os.ModePerm)
		}
		fileWriter, err := rotatelogs.New(
			logDir+string(os.PathSeparator)+"%Y-%m-%d-%H-%M.log",
			// generate soft link, point to latest log file
			//rotatelogs.WithLinkName(logSoftLink),
			// maximum time to save log files
			rotatelogs.WithMaxAge(7*24*time.Hour),
			// time period of log file switching
			rotatelogs.WithRotationTime(24*time.Hour),
		)
		if err != nil {
			fmt.Println(err)
			return backends
		}
		level, err := oplogging.LogLevel(c.File)
		if err != nil {
			fmt.Println(err)
		}
		backends = append(backends, createBackend(fileWriter, c, level))
	}

	return backends
}

func createBackend(w io.Writer, c config.Log, level oplogging.Level) oplogging.Backend {
	backend := oplogging.NewLogBackend(w, c.Prefix, 0)
	stdoutWriter := false
	if w == os.Stdout {
		stdoutWriter = true
	}
	format := getLogFormatter(c, stdoutWriter)
	backendLeveled := oplogging.AddModuleLevel(oplogging.NewBackendFormatter(backend, format))
	backendLeveled.SetLevel(level, module)
	return backendLeveled
}

func getLogFormatter(c config.Log, stdoutWriter bool) oplogging.Formatter {
	pattern := defaultFormatter
	if !stdoutWriter {
		// Color is only required for console output
		// Other writers don't need %{color} tag
		pattern = strings.Replace(pattern, "%{color:bold}", "", -1)
		pattern = strings.Replace(pattern, "%{color:reset}", "", -1)
	}
	if !c.LogFile {
		// Remove %{logfile} tag
		pattern = strings.Replace(pattern, "%{longfile}", "", -1)
	}
	return oplogging.MustStringFormatter(pattern)
}

　main.go

package main

import (
	"go_Logger/global"
	initizlize "go_Logger/initialize"
)

func main() {
	initizlize.InitGlobalLog()
	global.LOG.Debug("go-logging日志打印测试")
	global.LOG.Warning("go-logging日志打印测试")
	global.LOG.Error("go-logging日志打印测试")
}