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Programming language: Go
License: MIT License
Tags: Logging    
Latest version: v1.5.1

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README

License: MIT release CircleCI codecov Codacy Badge Go Report Card GolangCI Go Walker GoDoc DepShield Badge FOSSA Status

glg is simple golang logging library

Requirement

Go 1.16

Installation

go get github.com/kpango/glg

Example

package main

import (
    "net/http"
    "time"

    "github.com/kpango/glg"
)

// NetWorkLogger sample network logger
type NetWorkLogger struct{}

func (n NetWorkLogger) Write(b []byte) (int, error) {
    // http.Post("localhost:8080/log", "", bytes.NewReader(b))
    http.Get("http://127.0.0.1:8080/log")
    glg.Success("Requested")
    glg.Infof("RawString is %s", glg.RawString(b))
    return 1, nil
}

func main() {

    // var errWriter io.Writer
    // var customWriter io.Writer
    infolog := glg.FileWriter("/tmp/info.log", 0666)

    customTag := "FINE"
    customErrTag := "CRIT"

    errlog := glg.FileWriter("/tmp/error.log", 0666)
    defer infolog.Close()
    defer errlog.Close()

    glg.Get().
        SetMode(glg.BOTH). // default is STD
        // DisableColor().
        // SetMode(glg.NONE).
        // SetMode(glg.WRITER).
        // SetMode(glg.BOTH).
        // InitWriter().
        // AddWriter(customWriter).
        // SetWriter(customWriter).
        // AddLevelWriter(glg.LOG, customWriter).
        // AddLevelWriter(glg.INFO, customWriter).
        // AddLevelWriter(glg.WARN, customWriter).
        // AddLevelWriter(glg.ERR, customWriter).
        // SetLevelWriter(glg.LOG, customWriter).
        // SetLevelWriter(glg.INFO, customWriter).
        // SetLevelWriter(glg.WARN, customWriter).
        // SetLevelWriter(glg.ERR, customWriter).
        // EnableJSON().
        SetLineTraceMode(glg.TraceLineNone).
        AddLevelWriter(glg.INFO, infolog). // add info log file destination
        AddLevelWriter(glg.ERR, errlog).   // add error log file destination
        AddLevelWriter(glg.WARN, rotate)   // add error log file destination

    glg.Info("info")
    glg.Infof("%s : %s", "info", "formatted")
    glg.Log("log")
    glg.Logf("%s : %s", "info", "formatted")
    glg.Debug("debug")
    glg.Debugf("%s : %s", "info", "formatted")
    glg.Trace("Trace")
    glg.Tracef("%s : %s", "tracef", "formatted")
    glg.Warn("warn")
    glg.Warnf("%s : %s", "info", "formatted")
    glg.Error("error")
    glg.Errorf("%s : %s", "info", "formatted")
    glg.Success("ok")
    glg.Successf("%s : %s", "info", "formatted")
    glg.Fail("fail")
    glg.Failf("%s : %s", "info", "formatted")
    glg.Print("Print")
    glg.Println("Println")
    glg.Printf("%s : %s", "printf", "formatted")

    // set global log level to ERR level
    glg.Info("before setting level to ERR this message will show")
    glg.Get().SetLevel(glg.ERR)
    glg.Info("after setting level to ERR this message will not show")
    glg.Error("this log is ERR level this will show")
    glg.Get().SetLevel(glg.DEBG)
    glg.Info("log level is now DEBG, this INFO level log will show")

    glg.Get().
        AddStdLevel(customTag, glg.STD, false).                    // user custom log level
        AddErrLevel(customErrTag, glg.STD, true).                  // user custom error log level
        SetLevelColor(glg.TagStringToLevel(customTag), glg.Cyan).  // set color output to user custom level
        SetLevelColor(glg.TagStringToLevel(customErrTag), glg.Red) // set color output to user custom level
    glg.CustomLog(customTag, "custom logging")
    glg.CustomLog(customErrTag, "custom error logging")

    // glg.Info("kpango's glg supports disable timestamp for logging")
    glg.Get().DisableTimestamp()
    glg.Info("timestamp disabled")
    glg.Warn("timestamp disabled")
    glg.Log("timestamp disabled")
    glg.Get().EnableTimestamp()
    glg.Info("timestamp enabled")
    glg.Warn("timestamp enabled")
    glg.Log("timestamp enabled")

    glg.Info("kpango's glg support line trace logging")
    glg.Error("error log shows short line trace by default")
    glg.Info("error log shows none trace by default")
    glg.Get().SetLineTraceMode(glg.TraceLineShort)
    glg.Error("after configure TraceLineShort, error log shows short line trace")
    glg.Info("after configure TraceLineShort, info log shows short line trace")
    glg.Get().DisableTimestamp()
    glg.Error("after configure TraceLineShort and DisableTimestamp, error log shows short line trace without timestamp")
    glg.Info("after configure TraceLineShort and DisableTimestamp, info log shows short line trace without timestamp")
    glg.Get().EnableTimestamp()
    glg.Get().SetLineTraceMode(glg.TraceLineLong)
    glg.Error("after configure TraceLineLong, error log shows long line trace")
    glg.Info("after configure TraceLineLong, info log shows long line trace")
    glg.Get().DisableTimestamp()
    glg.Error("after configure TraceLineLong and DisableTimestamp, error log shows long line trace without timestamp")
    glg.Info("after configure TraceLineLong and DisableTimestamp, info log shows long line trace without timestamp")
    glg.Get().EnableTimestamp()
    glg.Get().SetLineTraceMode(glg.TraceLineNone)
    glg.Error("after configure TraceLineNone, error log without line trace")
    glg.Info("after configure TraceLineNone, info log without line trace")
    glg.Get().SetLevelLineTraceMode(glg.INFO, glg.TraceLineLong)
    glg.Info("after configure Level trace INFO=TraceLineLong, only info log shows long line trace")
    glg.Error("after configure Level trace INFO=TraceLineLong, error log without long line trace")
    glg.Get().SetLevelLineTraceMode(glg.ERR, glg.TraceLineShort)
    glg.Info("after configure Level trace ERR=TraceLineShort, info log still shows long line trace")
    glg.Error("after configure Level trace ERR=TraceLineShort, error log now shows short line trace")
    glg.Get().SetLineTraceMode(glg.TraceLineNone)

    glg.Info("kpango's glg support json logging")
    glg.Get().EnableJSON()
    err := glg.Warn("kpango's glg", "support", "json", "logging")
    if err != nil {
        glg.Get().DisableJSON()
        glg.Error(err)
        glg.Get().EnableJSON()
    }
    err = glg.Info("hello", struct {
        Name   string
        Age    int
        Gender string
    }{
        Name:   "kpango",
        Age:    28,
        Gender: "male",
    }, 2020)
    if err != nil {
        glg.Get().DisableJSON()
        glg.Error(err)
        glg.Get().EnableJSON()
    }   glg.CustomLog(customTag, "custom logging")

    glg.CustomLog(customErrTag, "custom error logging")

    glg.Get().AddLevelWriter(glg.DEBG, NetWorkLogger{}) // add info log file destination

    http.Handle("/glg", glg.HTTPLoggerFunc("glg sample", func(w http.ResponseWriter, r *http.Request) {
        glg.New().
        AddLevelWriter(glg.Info, NetWorkLogger{}).
        AddLevelWriter(glg.Info, w).
        Info("glg HTTP server logger sample")
    }))

    http.ListenAndServe("port", nil)

    // fatal logging
    glg.Fatalln("fatal")
}

Benchmarks

Contribution

  1. Fork it ( https://github.com/kpango/glg/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Author

kpango

LICENSE

glg released under MIT license, refer LICENSE file.
FOSSA Status


*Note that all licence references and agreements mentioned in the glg README section above are relevant to that project's source code only.