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139 lines
2.9 KiB
Markdown
139 lines
2.9 KiB
Markdown
go-log
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================
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[](https://goreportcard.com/report/github.com/subchen/go-log)
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[](https://godoc.org/github.com/subchen/go-log)
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Logging package similar to log4j for the Golang.
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* Support dynamic log level
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* Daily log file output
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* Fixed size log file ouput
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* Output console and file all at once
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* Output full stack
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* Output goroutinue id to console
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* Output colorized level to console
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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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### Default log to console
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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.SetLevel(log.L_INFO)
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log.Debug("cannot output debug message")
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log.Info("can output info message")
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}
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```
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### Output to file
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You can call `SetWriter` to set a file writer into log.
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```go
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log.SetWriter(&log.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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### We defined three 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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&log.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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&log.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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&log.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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&log.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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### New log 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.New(&log.DailyFileWriter{
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Name: "/tmp/test.log",
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})
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logger.Debugf("i = %d", 99)
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}
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```
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### Output stack
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You can use `log.Fatal(...)` or `log.Fatalf(...)` to output full stack
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```
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21:04:32.884 main FATAL logger_test.go:24 this is a fatal message
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at /go/src/github.com/subchen/go-log/logger_test.go:24 (0x81db3)
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at /usr/local/Cellar/go/1.5.2/libexec/src/testing/testing.go:456 (0x786c8)
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at /usr/local/Cellar/go/1.5.2/libexec/src/runtime/asm_amd64.s:1721 (0x59641)
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```
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### Log format
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```
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# time pid [name] [gid] level file:line message
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2016-02-10 19:33:02.587 12345 main 987 INFO fixed_size_file_writer_test.go:16 message ...
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```
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* `log.SetTimeFormat("2006-01-02 15:04:05.999")` customize time format
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* `log.SetAppName("main")` add a name in log for indicate process
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* `log.SetFlags(F_TIME | F_LONG_FILE | F_SHORT_FILE | F_PID | F_GID | F_COLOR)` to control what's printed
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### API on godoc.org
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https://godoc.org/github.com/subchen/go-log
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