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Programming language: Go
Tags: Logging    
Latest version: v0.1.0

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GLO

Logging library for Golang

Inspired by Monolog for PHP, severity levels are identical

Install

go get github.com/lajosbencz/glo

Severity levels

Debug     = 100
Info      = 200
Notice    = 250
Warning   = 300
Error     = 400
Critical  = 500
Alert     = 550
Emergency = 600

Simple example

package main

import "github.com/lajosbencz/glo"

func main() {
    // Info - Warning will go to os.Stdout
    // Error - Emergency will go to os.Stderr
    log := glo.NewStdFacility()

    // goes to os.Stdout
    log.Debug("Detailed debug line: %#v", map[string]string{"x": "foo", "y": "bar"})

    // goes to os.Stderr
    log.Error("Oooof!")
}

Output:

2019-01-22T15:16:08+01:00 [DEBUG] Detailed debug line [map[x:foo y:bar]]
2019-01-22T15:16:08+01:00 [ERROR] Oooof! []

Customized example

package main

import (
    "bytes"
    "fmt"
    "os"
    "strings"

    "github.com/lajosbencz/glo"
)

func main() {
    log := glo.NewFacility()

    // write everything to a buffer
    bfr := bytes.NewBufferString("")
    handlerBfr := glo.NewHandler(bfr)
    log.PushHandler(handlerBfr)

    // write only errors and above using a short format
    handlerStd := glo.NewHandler(os.Stdout)
    formatter := glo.NewFormatter("{L}: {M}")
    filter := glo.NewFilterLevel(glo.Error)
    handlerStd.SetFormatter(formatter)
    handlerStd.PushFilter(filter)
    log.PushHandler(handlerStd)

    fmt.Println("Log output:")
    fmt.Println(strings.Repeat("=", 70))
    log.Info("Only written to the buffer")
    log.Alert("Written to both buffer and stdout")

    fmt.Println("")
    fmt.Println("Buffer contents:")
    fmt.Println(strings.Repeat("=", 70))
    fmt.Println(bfr.String())
}

Output:

Log output:
======================================================================
ALERT: Written to both buffer and stdout []

Buffer contents:
======================================================================
2019-01-22T15:14:16+01:00 [INFO] Only written to the buffer []
2019-01-22T15:14:16+01:00 [ALERT] Written to both buffer and stdout []

Custom filter

package main

import (
    "os"
    "regexp"

    "github.com/lajosbencz/glo"
)

func main() {
    handler := glo.NewHandler(os.Stdout)
    filterEmptyLines := &filterRgx{regexp.MustCompile(`^.+$`)}
    handler.PushFilter(filterEmptyLines)

    log := glo.NewFacility()
    log.PushHandler(handler)

    log.Debug("", "format is empty, should be ignored")
    log.Debug("only this should appear at the output")
}

type filterRgx struct {
    rgx *regexp.Regexp
}

func (f *filterRgx) Check(level glo.Level, line string, params ...interface{}) bool {
    return f.rgx.MatchString(line)
}

Output:

2019-01-22T15:30:23+01:00 [DEBUG] only this should appear at the output