app:
  name: "web_app"
  mode: "dev"
  port: 8080
  version: "v0.01"
log:
  level: "debug"
  filename: "web_app.log"
  max_size: 200
  max_age: 30
  max_backups: 7

var Conf AppConfig
type AppConfig struct {
	App   App         `mapstructure:"app" yaml:"app"`
	Log   LogConfig   `mapstructure:"log"`
}
type App struct {
	Name      string `mapstructure:"name"`
	Mode      string `mapstructure:"mode"`
	Version   string `mapstructure:"version"`
	Port      int    `mapstructure:"port" yaml:"port"`
}
type LogConfig struct {
	Level      string `mapstructure:"level"`
	Filename   string `mapstructure:"filename"`
	MaxSize    int    `mapstructure:"max_size"`
	MaxAge     int    `mapstructure:"max_age"`
	MaxBackups int    `mapstructure:"max_backups"`
}

package logger
import(
	"github.com/gin-gonic/gin"
	"github.com/spf13/viper"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"gopkg.in/natefinch/lumberjack.v2"
)
var logger *zap.Logger
// Init 的兩個參數(shù)： cfg 和 mode
func Init(cfg *settings.LogConfig, mode string) (err error) {
	writeSyncer := getLogWriter(cfg.Filename, cfg.MaxSize, cfg.MaxBackups, cfg.MaxAge)
	encoder := getEncoder()
	var l = new(zapcore.Level)
	err = l.UnmarshalText([]byte(cfg.Level))
	if err != nil {
		return err
	}
	var core zapcore.Core
	// 開發(fā)模式，日志輸出終端
	if mode == "dev" {
		consoleEncoder := zapcore.NewConsoleEncoder(zap.NewDevelopmentEncoderConfig())
		core = zapcore.NewTee(
			zapcore.NewCore(encoder, writeSyncer, l), // 保存在日志中
			// 錯誤信息展示在終端
			zapcore.NewCore(consoleEncoder, zapcore.Lock(os.Stdout), zapcore.DebugLevel), 
		)
	} else {
		core = zapcore.NewCore(encoder, writeSyncer, l)
	}
	logger = zap.New(core, zap.AddCaller())
	lg := zap.New(core, zap.AddCaller())
	// 替換zap庫中的全局
	zap.ReplaceGlobals(lg)
	return err
}
func getEncoder() zapcore.Encoder {
	//return zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig())
	encodeConfig := zapcore.EncoderConfig{
		LevelKey:       "level",
		TimeKey:        "ts",
		NameKey:        "logger",
		CallerKey:      "caller",
		StacktraceKey:  "stacktrace",
		LineEnding:     zapcore.DefaultLineEnding,
		EncodeLevel:    zapcore.LowercaseLevelEncoder,
		EncodeTime:     zapcore.ISO8601TimeEncoder,
		EncodeDuration: zapcore.SecondsDurationEncoder,
		EncodeCaller:   zapcore.ShortCallerEncoder,
	}
	//return zapcore.NewConsoleEncoder(zap.NewProductionEncoderConfig())
	return zapcore.NewConsoleEncoder(encodeConfig)
}
// GinLogger 接收gin框架默認(rèn)的日志
func GinLogger() gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		path := c.Request.URL.Path
		query := c.Request.URL.RawQuery
		c.Next()
		cost := time.Since(start)
		zap.L().Info(path,
			zap.Int("status", c.Writer.Status()),
			zap.String("method", c.Request.Method),
			zap.String("path", path),
			zap.String("query", query),
			zap.String("ip", c.ClientIP()),
			zap.String("user-agent", c.Request.UserAgent()),
			zap.String("errors", c.Errors.ByType(gin.ErrorTypePrivate).String()),
			zap.Duration("cost", cost),
		)
	}
}
func getLogWriter(string, int, int, int) zapcore.WriteSyncer {
	lumberJackLogger := &lumberjack.Logger{
		Filename:   viper.GetString("log.filename"),
		MaxSize:    viper.GetInt("log.max_size"),    // 單位是M
		MaxBackups: viper.GetInt("log.max_backups"), // 備份數(shù)量
		MaxAge:     viper.GetInt("log.max_age"),     // 最大備份天數(shù)
		Compress:   false,                           // 是否壓縮
	}
	return zapcore.AddSync(lumberJackLogger)
}
func GinRecovery(stack bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				// Check for a broken connection, as it is not really a
				// condition that warrants a panic stack trace.
				var brokenPipe bool
				if ne, ok := err.(*net.OpError); ok {
					if se, ok := ne.Err.(*os.SyscallError); ok {
						if strings.Contains(strings.ToLower(se.Error()), "broken pipe") || strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
							brokenPipe = true
						}
					}
				}
				httpRequest, _ := httputil.DumpRequest(c.Request, false)
				if brokenPipe {
					zap.L().Error(c.Request.URL.Path,
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
					// If the connection is dead, we can't write a status to it.
					c.Error(err.(error)) // nolint: errcheck
					c.Abort()
					return
				}
				if stack {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
						zap.String("stack", string(debug.Stack())),
					)
				} else {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
				}
				c.AbortWithStatus(http.StatusInternalServerError)
			}
		}()
		c.Next()
	}
}

func main() {
	//	1、加載配置文件
	if err := settings.Init(); err != nil {
		fmt.Println("init setting failed", err)
		return
	}
	//  2、初始化日志
	if err := logger.Init(&settings.Conf.Log, settings.Conf.App.Mode); err != nil {
		fmt.Printf("init logger failed, err:%v\n", err)
	}
	defer zap.L().Sync()
	zap.L().Debug("logger init success...")
}