zap

Logger

var _ hlog.FullLogger = (*Logger)(nil)

type Logger struct {
    l      *zap.SugaredLogger
    config *config
}

NewLogger

Create and initialize a Logger through defaultConfig(). The required configuration can be passed into the function as a parameter. If no parameter is passed in, the initial configuration will be installed to create a Logger For related configuration, please refer to option configuration below.

Function Signature:

func NewLogger(opts ...Option) *Logger

Sample code:

package main

import (
    "github.com/cloudwego/hertz/pkg/common/hlog"
    hertzzap "github.com/hertz-contrib/logger/zap"
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
)

func main() {
    logger := hertzzap.NewLogger(hertzzap.WithZapOptions(zap.WithFatalHook(zapcore.WriteThenPanic)))

    hlog.SetLogger(logger)
}

Option configuration

WithCoreEnc

Encoder is a format-agnostic interface for all log entry marshalers, WithCoreEnc passes zapcore.Encoder into configuration

Function Signature:

func WithCoreEnc(enc zapcore.Encoder) Option

Sample code:

package main

import (
    hertzzap "github.com/hertz-contrib/logger/zap"
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
)

func main() {
    enc := zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig())
    l := hertzzap.NewLogger(hertzzap.WithCoreEnc(enc))
}

WithCoreWs

WithCoreWs specifies the location where the log is written through the zapcore.AddSync(file), and passes zapcore.WriteSyncer into the configuration

Function Signature:

func WithCoreWs(ws zapcore.WriteSyncer) Option

Sample code:

package main

import (
    hertzzap "github.com/hertz-contrib/logger/zap"
    "go.uber.org/zap/zapcore"
    "os"
)

func main() {
    ws := zapcore.AddSync(os.Stdout)
    l:=hertzzap.NewLogger(hertzzap.WithCoreWs(ws))
}

WithCoreLevel

WithCoreLevel passes zap.AtomicLevel into configuration

Function Signature:

func WithCoreLevel(lvl zap.AtomicLevel) Option 

Sample code:

package main

import (
    hertzzap "github.com/hertz-contrib/logger/zap"
    "go.uber.org/zap"
)

func main() {
    lvl := zap.NewAtomicLevelAt(zap.InfoLevel)
    l:=hertzzap.NewLogger(hertzzap.WithCoreLevel(lvl))
}

WithCores

WithCores passes zapcore.Encoder, zapcore.WriteSyncer, zap.AtomicLevel into CoreConfig into the configuration

Function Signature:

func WithCores(coreConfigs ...CoreConfig) Option

Sample code:

package main

import (
    hertzzap "github.com/hertz-contrib/logger/zap"
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
    "os"
)

func main() {
    enc := zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig())
    lvl := zap.NewAtomicLevelAt(zap.InfoLevel)
    ws := zapcore.AddSync(os.Stdout)

    cfg := hertzzap.CoreConfig{
        Enc: enc,
        Ws:  ws,
        Lvl: lvl,
    }

    l := hertzzap.NewLogger(hertzzap.WithCores(cfg))
}

WithZapOptions

WithZapOptions uses the append() method to append the original zap configuration

Function Signature:

func WithZapOptions(opts ...zap.Option) Option 

Sample code:

package main

import (
    hertzzap "github.com/hertz-contrib/logger/zap"
    "go.uber.org/zap"
)

func main() {
    opts := zap.AddCaller()
    l := hertzzap.NewLogger(hertzzap.WithZapOptions(opts,zap.Hooks()))
}
}

A complete zap example

package main

import (
	"context"
	"log"
	"os"
	"path"
	"time"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/common/hlog"
	"github.com/cloudwego/hertz/pkg/protocol/consts"
	hertzzap "github.com/hertz-contrib/logger/zap"
	"gopkg.in/natefinch/lumberjack.v2"
)

func main() {
	h := server.Default()

	// Customizable output directory.
	var logFilePath string
	dir := "./hlog"
	logFilePath = dir + "/logs/"
	if err := os.MkdirAll(logFilePath, 0o777); err != nil {
		log.Println(err.Error())
		return
	}

	// set filename to date
	logFileName := time.Now().Format("2006-01-02") + ".log"
	fileName := path.Join(logFilePath, logFileName)
	if _, err := os.Stat(fileName); err != nil {
		if _, err := os.Create(fileName); err != nil {
			log.Println(err.Error())
			return
		}
	}
	
	logger := hertzzap.NewLogger()
	// Provides compression and deletion
	lumberjackLogger := &lumberjack.Logger{
		Filename:   fileName,
		MaxSize:    20,   // A file can be up to 20M.
		MaxBackups: 5,    // Save up to 5 files at the same time
		MaxAge:     10,   // A file can be saved for up to 10 days.
		Compress:   true, // Compress with gzip.
	}

	logger.SetOutput(lumberjackLogger)
	logger.SetLevel(hlog.LevelDebug)

	hlog.SetLogger(logger)

	h.GET("/hello", func(ctx context.Context, c *app.RequestContext) {
		hlog.Info("Hello, hertz")
		c.String(consts.StatusOK, "Hello hertz!")
	})

	h.Spin()
}

For more details on how to adapt the interface of hlog, see hertz-contrib/logger/zap


Last modified July 3, 2023 : Update response.md (0a36fb2)