Provide logger.SetNoLock() to remove locking during log output

Locking is enabled by default. When file is opened with appending mode,
it's safe to write concurrently to a file. In this case user can
choose to disable the lock.

logger.go

@@ -26,8 +26,29 @@ type Logger struct {
 	// to) `logrus.Info`, which allows Info(), Warn(), Error() and Fatal() to be
 	// logged. `logrus.Debug` is useful in
 	Level Level
-	// Used to sync writing to the log.
-	mu sync.Mutex
+	// Used to sync writing to the log. Locking is enabled by Default
+	mu MutexWrap
+}
+
+type MutexWrap struct {
+	lock     sync.Mutex
+	disabled bool
+}
+
+func (mw *MutexWrap) Lock() {
+	if !mw.disabled {
+		mw.lock.Lock()
+	}
+}
+
+func (mw *MutexWrap) Unlock() {
+	if !mw.disabled {
+		mw.lock.Unlock()
+	}
+}
+
+func (mw *MutexWrap) Disable() {
+	mw.disabled = true
 }
 
 // Creates a new logger. Configuration should be set by changing `Formatter`,
@@ -210,3 +231,10 @@ func (logger *Logger) Panicln(args ...interface{}) {
 		NewEntry(logger).Panicln(args...)
 	}
 }
+
+//When file is opened with appending mode, it's safe to
+//write concurrently to a file (within 4k message on Linux).
+//In these cases user can choose to disable the lock.
+func (logger *Logger) SetNoLock() {
+	logger.mu.Disable()
+}

logger_bench_test.go

@@ -22,6 +22,15 @@ func BenchmarkDummyLogger(b *testing.B) {
 	doLoggerBenchmark(b, nullf, &TextFormatter{DisableColors: true}, smallFields)
 }
 
+func BenchmarkDummyLoggerNoLock(b *testing.B) {
+	nullf, err := os.OpenFile("/dev/null", os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		b.Fatalf("%v", err)
+	}
+	defer nullf.Close()
+	doLoggerBenchmarkNoLock(b, nullf, &TextFormatter{DisableColors: true}, smallFields)
+}
+
 func doLoggerBenchmark(b *testing.B, out *os.File, formatter Formatter, fields Fields) {
 	logger := Logger{
 		Out:       out,
@@ -35,3 +44,18 @@ func doLoggerBenchmark(b *testing.B, out *os.File, formatter Formatter, fields F
 		}
 	})
 }
+
+func doLoggerBenchmarkNoLock(b *testing.B, out *os.File, formatter Formatter, fields Fields) {
+	logger := Logger{
+		Out:       out,
+		Level:     InfoLevel,
+		Formatter: formatter,
+	}
+	logger.SetNoLock()
+	entry := logger.WithFields(fields)
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			entry.Info("aaa")
+		}
+	})
+}