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138 lines
2.7 KiB
Markdown
138 lines
2.7 KiB
Markdown
go-log
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================
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[](https://godoc.org/github.com/subchen/go-log)
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[](https://travis-ci.org/subchen/go-log)
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[](https://coveralls.io/github/subchen/go-log?branch=master)
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[](https://goreportcard.com/report/github.com/subchen/go-log)
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[](http://www.apache.org/licenses/LICENSE-2.0)
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Logging package similar to log4j for the Golang.
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- Support dynamic log level
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- Support customized formatter
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- TextFormatter
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- JSONFormatter
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- Support multiple rolling file writers
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- FixedSizeFileWriter
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- DailyFileWriter
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- AlwaysNewFileWriter
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Installation
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---------------
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```bash
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$ go get github.com/subchen/go-log
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```
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Usage
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---------------
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```go
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package main
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import (
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"os"
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"errors"
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"github.com/subchen/go-log"
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)
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func main() {
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log.Debugf("app = %s", os.Args[0])
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log.Errorf("error = %v", errors.New("some error"))
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// dynamic set level
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log.Default.Level = log.WARN
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log.Debug("cannot output debug message")
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log.Errorln("can output error message", errors.New("some error"))
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}
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```
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### Output
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Default log to console, you can set `Logger.Out` to set a file writer into log.
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```go
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import (
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"github.com/subchen/go-log"
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"github.com/subchen/go-log/writers"
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)
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log.Default.Out = &writers.FixedSizeFileWriter{
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Name: "/tmp/test.log",
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MaxSize: 10 * 1024 * 1024, // 10m
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MaxCount: 10,
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})
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```
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Three builtin writers for use
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```go
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// Create log file if file size large than fixed size (10m)
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// files: /tmp/test.log.0 .. test.log.10
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&writers.FixedSizeFileWriter{
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Name: "/tmp/test.log",
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MaxSize: 10 * 1024 * 1024, // 10m
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MaxCount: 10,
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}
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// Create log file every day.
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// files: /tmp/test.log.20160102
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&writers.DailyFileWriter{
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Name: "/tmp/test.log",
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MaxCount: 10,
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}
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// Create log file every process.
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// files: /tmp/test.log.20160102_150405
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&writers.AlwaysNewFileWriter{
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Name: "/tmp/test.log",
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MaxCount: 10,
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}
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// Output to multiple writes
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io.MultiWriter(
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os.Stdout,
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&writers.DailyFileWriter{
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Name: "/tmp/test.log",
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MaxCount: 10,
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}
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//...
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)
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```
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### Formatter
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```go
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import (
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"github.com/subchen/go-log"
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"github.com/subchen/go-log/formatters"
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)
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log.Default.Formatter = new(formatters.TextFormatter)
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```
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### New Logger instance
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```go
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import (
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"github.com/subchen/go-log"
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)
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func main() {
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logger := &log.Logger{
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Level: log.INFO,
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Formatter: new(formatters.JSONFormatter),
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Out: os.Stdout,
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}
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logger.Infof("i = %d", 99)
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}
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```
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## LICENSE
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Apache 2.0
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