slog

Hertz 对接 slog 和 lumberjack。

Logger 结构体

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

type Logger struct {
    l   *slog.Logger
    cfg *config
}

NewLogger

通过 defaultConfig() 创建并初始化一个 Logger,便于后续的调用,可将所需配置作为参数传入函数,若不传入参数则安装初始配置创建 Logger 相关配置请参考后面的 option 的配置

目前只支持 slog 库里的 slog.NewJSONHandler(),不支持 slog.NewTextHandler()

函数签名:

func NewLogger(opts ...Option) *Logger

示例代码:

package main

import (
    "github.com/cloudwego/hertz/pkg/common/hlog"
    hertzslog "github.com/hertz-contrib/logger/slog"
    "os"
)

func main() {
    logger := hertzslog.NewLogger(hertzslog.WithOutput(os.Stdout))
    hlog.SetLogger(logger)
}

Logger

Logger 用于获取 *slog.Logger 以满足复杂操作

函数签名:

func (l *Logger) Logger() *slog.Logger

示例代码:

package main

import (
    hertzslog "github.com/hertz-contrib/logger/slog"
    "os"
)

func main() {
    logger := hertzslog.NewLogger(hertzslog.WithOutput(os.Stdout))
    l := logger.Logger()
}

Option 的相关配置

WithOutput

WithOutput 用来设置日志的输出位置

函数签名:

func WithOutput(writer io.Writer) Option

示例代码:

package main

import (
    hertzslog "github.com/hertz-contrib/logger/slog"
    "os"
)

func main() {
    logger := hertzslog.NewLogger(hertzslog.WithOutput(os.Stdout))
}


WithLevel

WithLevel 对传入的 *slog.LevelVar 进行判断,高于或等于这个日志级别的才会被记录

值得注意的是,如果 WithLevelWithHandlerOptions 一起设置,WithLevel 的日志等级会覆盖掉 WithHandlerOptions 中的日志等级

函数签名:

func WithLevel(lvl *slog.LevelVar) Option

示例代码:

package main

import (
    hertzslog "github.com/hertz-contrib/logger/slog"
)

func main() {
    // 空的 LevelVar 对应 LevelInfo
    logger := hertzslog.NewLogger(hertzslog.WithLevel(&slog.LevelVar{}))

    // 动态设置日志登记为 LevelDebug
    levelVar := slog.LevelVar{}
    levelVar.Set(slog.LevelDebug)
    logger := hertzslog.NewLogger(hertzslog.WithLevel(&slog.LevelVar{}))
}

WithHandlerOptions

WithHandlerOptions*slog.HandlerOptions 传入配置

函数名称:

func WithHandlerOptions(opts *slog.HandlerOptions) Option

示例代码:

package main

import (
    hertzslog "github.com/hertz-contrib/logger/slog"
)

func main() {
    logger := hertzslog.NewLogger(hertzslog.WithHandlerOptions(&slog.HandlerOptions{
        AddSource:   false,
        Level:       slog.LevelInfo,
        ReplaceAttr: nil,
    }))
}

一个完整的 slog 示例

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"
	hertzslog "github.com/hertz-contrib/logger/slog"
	"gopkg.in/natefinch/lumberjack.v2"
)

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

	// 可定制的输出目录。
	var logFilePath string
	dir := "./hlog"
	logFilePath = dir + "/logs/"
	if err := os.MkdirAll(logFilePath, 0o777); err != nil {
		log.Println(err.Error())
		return
	}

	// 将文件名设置为日期
	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 := hertzslog.NewLogger()
	// 提供压缩和删除
	lumberjackLogger := &lumberjack.Logger{
		Filename:   fileName,
		MaxSize:    20,   // 一个文件最大可达 20M。
		MaxBackups: 5,    // 最多同时保存 5 个文件。
		MaxAge:     10,   // 一个文件最多可以保存 10 天。
		Compress:   true, // 用 gzip 压缩。
	}

	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()
}

适配 hlog 的接口的方法等更多用法详见 hertz-contrib/logger/slog


最后修改 July 24, 2024 : docs: fix error in render (#1110) (34e4f87)