在 Go 專案將日誌儲存到檔案

Others
,

做法

新增一個 logger 檔，使用 log.New() 方法定義日誌處理器。

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package logger

import (
	"fmt"
	"github.com/memochou1993/github-rankings/util"
	"github.com/spf13/viper"
	"log"
	"os"
	"reflect"
	"strings"
	"time"
)

// 宣告重複使用的日誌處理器
var (
	infoLogger    *log.Logger
	successLogger *log.Logger
	warningLogger *log.Logger
	errorLogger   *log.Logger
	debugLogger   *log.Logger
)

// 宣告不同的日誌處理器的前綴
const (
	typeInfo    = "INFO"
	typeSuccess = "SUCCESS"
	typeWarning = "WARNING"
	typeError   = "ERROR"
	typeDebug   = "DEBUG"
)

// 宣告不同的顏色
var (
	blue   = color("\033[1;34m%s\033[0m")
	green  = color("\033[1;32m%s\033[0m")
	yellow = color("\033[1;33m%s\033[0m")
	red    = color("\033[1;31m%s\033[0m")
	purple = color("\033[1;35m%s\033[0m")
)

func Init() {
	// 使用當天日期做為檔名
	name := fmt.Sprintf("./storage/logs/%s.txt", time.Now().Format("2006-01-02"))
	file, err := os.OpenFile(name, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
	if err != nil {
		log.Fatal(err)
	}

	// 初始化不同的日誌處理器
	infoLogger = log.New(file, prefix(typeInfo), log.Ldate|log.Ltime)
	successLogger = log.New(file, prefix(typeSuccess), log.Ldate|log.Ltime)
	warningLogger = log.New(file, prefix(typeWarning), log.Ldate|log.Ltime)
	errorLogger = log.New(file, prefix(typeError), log.Ldate|log.Ltime)
	debugLogger = log.New(file, prefix(typeDebug), log.Ldate|log.Ltime)
}

func Info(v interface{}) {
	infoLogger.Println(v)
	log.Println(blue(prefix(typeInfo) + v))
}

func Success(v interface{}) {
	successLogger.Println(v)
	log.Println(green(prefix(typeSuccess) + v))
}

func Warning(v interface{}) {
	warningLogger.Println(v)
	log.Println(yellow(prefix(typeWarning) + v))
}

func Error(v interface{}) {
	errorLogger.Println(v)
	log.Println(red(prefix(typeError) + v))
}

func Debug(v interface{}) {
	debugLogger.Println(v)
	log.Println(purple(prefix(typeDebug) + v))
}

func prefix(prefix string) string {
	return fmt.Sprintf("[%s.%s] ", strings.ToUpper(viper.GetString("APP_ENV")), prefix)
}

func color(color string) func(...interface{}) string {
	return func(args ...interface{}) string {
		return fmt.Sprintf(color, fmt.Sprint(args...))
	}
}

使用如下：

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logger.Info("Hello, World!")
logger.Success("Hello, World!")
logger.Warning("Hello, World!")
logger.Error("Hello, World!")
logger.Debug("Hello, World!")