go各框架的log日志-526互联

1.kratos
Log:

type Logger interface {
    Log(level Level, keyvals ...interface{}) error
}
type logger struct {
    logger    Logger
    prefix    []interface{}
    hasValuer bool
    ctx       context.Context
}

kratos抽象了Logger接口，通过调Logger的Log方法来打印日志

l := log.DefaultLogger
_ = l.Log(log.LevelInfo, "test1:", 1)  // INFO test1:=1 
//所以可以调用不同的日志库，只要实现了Log接口。
type Helper struct {
    logger Logger
    msgKey string
}
h := log.NewHelper(l)
h.Info("test2:", 2)  // INFO msg=test2:2

可以通过NewHelper()方法来传入Logger
Helper用来帮助简写代码，省略了一些日志等级，用Info，Debug等方法输出日志。

with:

l := log.DefaultLogger
logger := log.With(l, "time:", log.DefaultTimestamp)

h := log.NewHelper(logger)
h.Info("test2:", 2)  // INFO time:=2023-03-23T16:26:25+08:00 msg=test2:2

kratos日志还有日志过滤，绑定context，全局日志等。
使用:
kratos框架建议是注入到各层初始化方法，然后通过结构体调用。

2.kitex 日志

type FullLogger interface {
    Logger
    FormatLogger
    CtxLogger
    Control
}

FullLogger定义了kitex日志要实现的方法，包括了Infof，Debugf，Debug，Info，CtxDebugf，CtxInfof等等方法。
kitex在 pkg/klog 里定义了一个全局defaultLogger ，可以通过SetLogger 传入实现了FullLogger接口的结果换掉默认的logger

打印日志

import (
    "github.com/cloudwego/kitex/pkg/klog"
    kitexlogrus "github.com/kitex-contrib/obs-opentelemetry/logging/logrus"
)
func main() {
    klog.Info("test1:", 1)
    klog.SetLogger(kitexlogrus.NewLogger())
    klog.SetLevel(klog.LevelDebug)
    klog.Info("test2:", 2)
}
//2023/03/23 17:34:08.368679 mytest.go:9: [Info] test1:1
//{"level":"info","msg":"test2:2","time":"2023-03-23T17:34:08+08:00"}

3.go-zero 日志
go-zero在logx包下定义了日志的一些配置

type LogConf struct {
    ServiceName string `json:",optional"`
    Mode string `json:",default=console,options=[console,file,volume]"`
    Encoding string `json:",default=json,options=[json,plain]"`
    TimeFormat string `json:",optional"`
    Path string `json:",default=logs"`
    Level string `json:",default=info,options=[info,error,severe]"`
    Compress bool `json:",optional"`
    KeepDays int `json:",optional"`
    StackCooldownMillis int `json:",default=100"`
}

其中包括了ServiceName，Encoding，Path等

定义了日志的打印方法

type Logger interface {
    Debug(...any)
    Debugf(string, ...any)
    …..
    Errorw(string, ...LogField)
    WithFields(fields ...LogField) Logger
}

logx定义了两个接口，方便自定义 logx，将日志写入任何存储。
* logx.NewWriter(w io.Writer)
* logx.SetWriter(write logx.Writer)

import (
    "github.com/zeromicro/go-zero/core/logx"
    "github.com/zeromicro/zero-contrib/logx/zapx"
)

func main() {
    logx.Error("test1:", 1)
    logx.Info("test2:", 2)

    writer, _ := zapx.NewZapWriter()
    logx.SetWriter(writer)
    logx.Info("test3:", 3)
}

//{"@timestamp":"2023-03-23T18:05:26.332+08:00","caller":"test/mytest.go:9","content":"test1:1","level":"error"}
//{"@timestamp":"2023-03-23T18:05:26.332+08:00","caller":"test/mytest.go:10","content":"test2:2","level":"info"}
//{"level":"info","ts":1679565926.332802,"caller":"test/mytest.go:14","msg":"test3:3","caller":"test/mytest.go:14"}