added cooldown to logger buffered writer

src/logger/bufio_wrapper.go

@@ -2,32 +2,68 @@ package logger
 
 import (
 	"bufio"
+	"context"
+	"io"
 	"sync"
+	"time"
 )
 
+const FlushInterval = 500 * time.Millisecond
+
 type bufioWrapper struct {
-	*bufio.Writer
-	m *sync.RWMutex
+	writer *bufio.Writer
+	ticker *time.Ticker
+	mutex  *sync.RWMutex
+}
+
+func newWrapper(writer io.Writer) *bufioWrapper {
+	ticker := time.NewTicker(FlushInterval)
+	ticker.Stop()
+
+	return &bufioWrapper{
+		writer: bufio.NewWriterSize(writer, 128*1024),
+		mutex:  &sync.RWMutex{},
+		ticker: ticker,
+	}
+}
+
+func (b *bufioWrapper) FlushRoutine(ctx context.Context) {
+	go func() {
+		b.ticker.Reset(FlushInterval)
+		defer b.ticker.Stop()
+
+		for {
+			b.flush()
+
+			select {
+			case <-ctx.Done():
+				b.flush()
+				return
+			case <-b.ticker.C:
+			}
+		}
+	}()
 }
 
 func (b *bufioWrapper) Write(p []byte) (nn int, err error) {
 	// TODO: try replace mutex, improve logging perfomance
-	b.m.RLock()
-	defer b.m.RUnlock()
+	b.mutex.RLock()
+	defer b.mutex.RUnlock()
 
-	return b.Writer.Write(p)
+	if len(p) > b.writer.Available() {
+		b.ticker.Reset(FlushInterval)
+	}
+
+	return b.writer.Write(p)
 }
 
-func (b *bufioWrapper) Flush() error {
-	b.m.Lock()
-	defer b.m.Unlock()
+func (b *bufioWrapper) flush() error {
+	b.mutex.Lock()
+	defer b.mutex.Unlock()
 
-	return b.Writer.Flush()
+	return b.writer.Flush()
 }
 
 func (b *bufioWrapper) Close() error {
-	b.m.Lock()
-	defer b.m.Unlock()
-
-	return b.Writer.Flush()
+	return b.flush()
 }

src/logger/new.go

@@ -1,12 +1,9 @@
 package logger
 
 import (
-	"bufio"
 	"context"
 	"io"
 	"os"
-	"sync"
-	"time"
 
 	"github.com/rs/zerolog"
 )
@@ -25,7 +22,7 @@ type NewLoggerOpts struct {
 	// OutputStream OutputStream
 }
 
-func New(opts NewLoggerOpts) (Logger, error) {
+func New(ctx context.Context, opts NewLoggerOpts) (Logger, error) {
 	// TODO: pass output streams from opts
 	writers := []io.Writer{}
 	writers = append(writers, os.Stderr)
@@ -45,26 +42,9 @@ func New(opts NewLoggerOpts) (Logger, error) {
 	}
 
 	// TODO: move to wrapper, determine optimal buffer size
-	writer := bufio.NewWriterSize(io.MultiWriter(writers...), 8*1024)
-	wrapper := &bufioWrapper{writer, &sync.RWMutex{}}
-
-	// Periodically flush buffer
-	go func() {
-		// TODO: add cooldown if flush was triggered by overfow
-		tmr := time.NewTicker(500 * time.Millisecond)
-		defer tmr.Stop()
-
-		for {
-			wrapper.Flush()
-
-			select {
-			case <-context.Background().Done():
-				wrapper.Flush()
-				return
-			case <-tmr.C:
-			}
-		}
-	}()
+	writer := io.MultiWriter(writers...)
+	wrapper := newWrapper(writer)
+	wrapper.FlushRoutine(ctx)
 
 	l := zerolog.New(wrapper).Level(level).With().Timestamp().Logger()
 	return &logger{