reduce gzip allocation

weed/util/compression_stream.go

@@ -0,0 +1,53 @@
+package util
+
+import (
+	"compress/gzip"
+	"fmt"
+	"io"
+	"sync"
+)
+
+var (
+	gzipReaderPool = sync.Pool{
+		New: func() interface{} {
+			return new(gzip.Reader)
+			//return gzip.NewReader()
+		},
+	}
+
+	gzipWriterPool = sync.Pool{
+		New: func() interface{} {
+			w, _ := gzip.NewWriterLevel(nil, gzip.BestSpeed)
+			return w
+		},
+	}
+)
+
+func GzipStream(w io.Writer, r io.Reader) (int64, error) {
+	gw, ok := gzipWriterPool.Get().(*gzip.Writer)
+	if !ok {
+		return 0, fmt.Errorf("gzip: new writer error")
+	}
+	gw.Reset(w)
+	defer func() {
+		gw.Close()
+		gzipWriterPool.Put(gw)
+	}()
+	return io.Copy(gw, r)
+}
+
+func GunzipStream(w io.Writer, r io.Reader) (int64, error) {
+	gr, ok := gzipReaderPool.Get().(*gzip.Reader)
+	if !ok {
+		return 0, fmt.Errorf("gzip: new reader error")
+	}
+
+	if err := gr.Reset(r); err != nil {
+		return 0, err
+	}
+	defer func() {
+		gr.Close()
+		gzipReaderPool.Put(gr)
+	}()
+	return io.Copy(w, gr)
+}