Golang log庫 原始碼閱讀
Golang的log庫。。。還是太簡單,簡單瞄了一下實現,差不多就是這樣:
package main import ( "fmt" "io" "os" "sync" ) type Logger struct { musync.Mutex out io.Writer } func New(out io.Writer) *Logger { return &Logger{out: out} } func (l *Logger) output(format string, v ...interface{}) { l.mu.Lock() defer l.mu.Unlock() l.out.Write([]byte(fmt.Sprintf(format, v...))) } func (l *Logger) Printf(format string, v ...interface{}) { l.output(format, v...) } func (l *Logger) Panicf(format string, v ...interface{}) { l.output(format, v...) panic("traceback:\n") } func (l *Logger) Fatalf(format string, v ...interface{}) { l.output(format, v...) os.Exit(1) } var std = New(os.Stderr) func Printf(format string, v ...interface{}) { std.Printf(format, v...) } func Panicf(format string, v ...interface{}) { std.Panicf(format, v...) } func Fatalf(format string, v ...interface{}) { std.Fatalf(format, v...) }
測試用例:
package main func main() { std.Printf("this is: %d\n", 1) std.Panicf("bye\n") }
執行結果:
root@arch test: ./main this is: 1 bye panic: traceback: goroutine 1 [running]: main.(*Logger).Panicf(0xc42006a060, 0x4a7115, 0x4, 0x0, 0x0, 0x0) /root/test/mylog.go:32 +0xa8 main.main() /root/test/main.go:6 +0xeb root@arch test: