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go-log

Logging package similar to log4j for the Golang.

Support dynamic log level
Daily log file output
Fixed size log file ouput
Output console and file all at once
Output full stack
Output goroutinue id to console
Output colorized level to console

Installation

$ go get github.com/subchen/go-log

Usage

Default log to console

import (
    "github.com/subchen/go-log"
)

func main() {
    log.Debug("Some Message ...")
    log.Error("error = %v", errors.New("some error"))

    // dynamic set level
    log.SetLevel(log.INFO)

    log.Debug("cannot output debug message")
    log.Info("can output info message")
}

Output to file

import (
    "github.com/subchen/go-log"
)

func main() {
    log.SetWriter(&log.FixedSizeFileWriter{
        Name:     "/tmp/test.log",
        MaxSize:  10 * 1024 * 1024, // 10m
        MaxCount: 10,
    })

    log.Debug("x = %v", "123")
}

We have four writers for use

// Create log file if file size large than fixed size (10m)
// files: /tmp/test.log.0 .. test.log.10
&log.FixedSizeFileWriter{
    Name:     "/tmp/test.log",
    MaxSize:  10 * 1024 * 1024, // 10m
    MaxCount: 10,
}

// Create log file every day.
// files: /tmp/test.log.2016-01-02
&log.DailyFileWriter{
    Name: "/tmp/test.log",
}

// Create log file every process.
// files: /tmp/test.log.20160102_150405
&log.AlwaysNewFileWriter{
    Name: "/tmp/test.log",
}

// Output to multiple writes
&log.CompositeWriters{
    os.Stdout,
    &log.DailyFileWriter{
        Name: "/tmp/test.log",
    }
    //...
}

New log instance

import (
    "github.com/subchen/go-log"
)

func main() {
    logger := log.New(&log.DailyFileWriter{
        Name: "/tmp/test.log",
    })

    logger.Debug("i = %d", 99)
}

Output stack

You can use log.Fatal(...) to output full stack

21:04:32.884 main FATAL logger_test.go:24 this is a fatal message
	at /go/src/github.com/subchen/go-log/logger_test.go:24 (0x81db3)
	at /usr/local/Cellar/go/1.5.2/libexec/src/testing/testing.go:456 (0x786c8)
	at /usr/local/Cellar/go/1.5.2/libexec/src/runtime/asm_amd64.s:1721 (0x59641)

Log format

# time pid [name] [gid] level file:line message
2016-02-10 19:33:02.587 12345 main 987 INFO fixed_size_file_writer_test.go:16 message ...

log.SetTimeLayout("2006-01-02 15:04:05.999") customize time format
log.SetName("main") add a name in log for indicate process
log.EnableGoroutineId(true) to output goroutine id
log.EnableLongFileFormat(true) to output long file name
log.EnableColorizedLevel(true) to output colorful message to console

API on godoc.org

https://godoc.org/github.com/subchen/go-log

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