ref: 53e30e39a6156b3182cff49af4e9375216e9df77
dir: /logger/logger.go/
package log import ( "fmt" "io" goLog "log" "os" "sync" ) // Sink for Go's log pkg var ( Sink io.Writer quiet bool gl *goLog.Logger Debug bool mu sync.Mutex last string lastSev int repeated int ) func init() { gl = goLog.New(os.Stderr, "", goLog.LstdFlags) } func SetQuiet() { mu.Lock() defer mu.Unlock() quiet = true Sink = &NullWriter{} goLog.SetOutput(Sink) } type NullWriter struct{} func (w *NullWriter) Write(p []byte) (n int, err error) { n = len(p) return } func Printf(format string, v ...interface{}) { emit(debug, format, v...) } func Infof(format string, v ...interface{}) { emit(info, format, v...) } func Errorf(format string, v ...interface{}) { emit(er, format, v...) } func Fatal(v ...interface{}) { gl.Fatal(v...) } func Fatalf(format string, v ...interface{}) { gl.Fatalf(format, v...) } const ( debug = iota print info er fatal flush ) func Flush() { emit(flush, "") } func emit(severity int, format string, v ...interface{}) { mu.Lock() defer mu.Unlock() if severity == debug && !Debug { return } if (severity != fatal && severity != flush) && quiet { return } msg := fmt.Sprintf(format, v...) switch { case last == msg && lastSev == severity: repeated++ case repeated > 0: goLog.Printf("...and %v more", repeated) repeated = 0 fallthrough default: switch severity { case debug: gl.Printf(format, v...) case info: gl.Printf(format, v...) case er: gl.Printf(format, v...) case fatal: gl.Fatalf(format, v...) case flush: } } last = msg lastSev = severity }