go - Zap 记录器打印到控制台和日志文件

Question

我已将 Zap 与我的 go 应用程序集成，我们将日志打印在两个日志文件中，我还使用 Lumberjack 进行日志轮换。但我也试图在控制台中显示日志，但这种情况下运气不好。以下是我在 logger.go 中的代码

var (
    Logger *zap.Logger
    N2n    *zap.Logger
)

type WriteSyncer struct {
    io.Writer
}

func (ws WriteSyncer) Sync() error {
    return nil
}

func InitLogging(mode string) {
    var cfg zap.Config
    var logName = "abc.log"
    var slogName = "n2n.log"

    if mode == "production" {
        cfg = zap.NewProductionConfig()
        cfg.DisableCaller = true
    } else {
        cfg = zap.NewDevelopmentConfig()
        cfg.EncoderConfig.LevelKey = "level"
        cfg.EncoderConfig.NameKey = "name"
        cfg.EncoderConfig.MessageKey = "msg"
        cfg.EncoderConfig.CallerKey = "caller"
        cfg.EncoderConfig.StacktraceKey = "stacktrace"
    }

    cfg.Encoding = "json"
    cfg.EncoderConfig.TimeKey = "timestamp"
    cfg.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
    cfg.OutputPaths = []string{logName}
    sw := getWriteSyncer(logName)
    swSugar := getWriteSyncer(slogName)

    l, err := cfg.Build(SetOutput(sw, cfg))
    if err != nil {
        panic(err)
    }
    defer l.Sync()

    ls, err := cfg.Build(SetOutput(swSugar, cfg))
    if err != nil {
        panic(err)
    }
    defer ls.Sync()

    Logger = l
    N2n = ls
}

// SetOutput replaces existing Core with new, that writes to passed WriteSyncer.
func SetOutput(ws zapcore.WriteSyncer, conf zap.Config) zap.Option {
    var enc zapcore.Encoder
    switch conf.Encoding {
    case "json":
        enc = zapcore.NewJSONEncoder(conf.EncoderConfig)
    case "console":
        enc = zapcore.NewConsoleEncoder(conf.EncoderConfig)
    default:
        panic("unknown encoding")
    }

    return zap.WrapCore(func(core zapcore.Core) zapcore.Core {
        return zapcore.NewCore(enc, ws, conf.Level)
    })
}

func getWriteSyncer(logName string) zapcore.WriteSyncer {
    var ioWriter = &lumberjack.Logger{
        Filename:   logName,
        MaxSize:    10, // MB
        MaxBackups: 3,  // number of backups
        MaxAge:     28, //days
        LocalTime:  true,
        Compress:   false, // disabled by default
    }
    var sw = WriteSyncer{
        ioWriter,
    }
    return sw
}

我已尝试附加输出路径，但它不起作用。

Answer 1

由于这是在 Google 上查找后首先出现的内容之一，这里有一个简单的示例，说明如何在控制台和日志文件上显示日志，日志文件可以是任何 io.Writer，如伐木 worker :

func logInit(d bool, f *os.File) *zap.SugaredLogger {

    pe := zap.NewProductionEncoderConfig()

    fileEncoder := zapcore.NewJSONEncoder(pe)

    pe.EncodeTime = zapcore.ISO8601TimeEncoder # The encoder can be customized for each output
    consoleEncoder := zapcore.NewConsoleEncoder(pe)

    level := zap.InfoLevel
    if d {
        level = zap.DebugLevel
    }

    core := zapcore.NewTee(
        zapcore.NewCore(fileEncoder, zapcore.AddSync(f), level),
        zapcore.NewCore(consoleEncoder, zapcore.AddSync(os.Stdout), level),
    )

    l := zap.New(core) # Creating the logger

    return l.Sugar()
}

我使用了默认的 ProductionEncoderConfig，但它可以是自定义的，例如 OP 代码中的那个。