From 7720533f84cc6589e07247b1391868b7222cc33d Mon Sep 17 00:00:00 2001
From: qieqieplus <admin@qieqie.me>
Date: Fri, 20 Aug 2021 18:36:51 +0800
Subject: [PATCH] reduce gzip allocation

---
 weed/util/compression.go        | 32 +++++++-------------
 weed/util/compression_stream.go | 53 +++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 21 deletions(-)
 create mode 100644 weed/util/compression_stream.go

diff --git a/weed/util/compression.go b/weed/util/compression.go
index 8699a8117..8158b9ba5 100644
--- a/weed/util/compression.go
+++ b/weed/util/compression.go
@@ -2,10 +2,7 @@ package util
 
 import (
 	"bytes"
-	"compress/flate"
-	"compress/gzip"
 	"fmt"
-	"io/ioutil"
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -42,17 +39,21 @@ func MaybeDecompressData(input []byte) []byte {
 }
 
 func GzipData(input []byte) ([]byte, error) {
-	buf := new(bytes.Buffer)
-	w, _ := gzip.NewWriterLevel(buf, flate.BestSpeed)
-	if _, err := w.Write(input); err != nil {
-		glog.V(2).Infof("error gzip data: %v", err)
+	w := new(bytes.Buffer)
+	_, err := GzipStream(w, bytes.NewReader(input))
+	if err != nil {
 		return nil, err
 	}
-	if err := w.Close(); err != nil {
-		glog.V(2).Infof("error closing gzipped data: %v", err)
+	return w.Bytes(), nil
+}
+
+func ungzipData(input []byte) ([]byte, error) {
+	w := new(bytes.Buffer)
+	_, err := GunzipStream(w, bytes.NewReader(input))
+	if err != nil {
 		return nil, err
 	}
-	return buf.Bytes(), nil
+	return w.Bytes(), nil
 }
 
 func DecompressData(input []byte) ([]byte, error) {
@@ -67,17 +68,6 @@ func DecompressData(input []byte) ([]byte, error) {
 	return input, UnsupportedCompression
 }
 
-func ungzipData(input []byte) ([]byte, error) {
-	buf := bytes.NewBuffer(input)
-	r, _ := gzip.NewReader(buf)
-	defer r.Close()
-	output, err := ioutil.ReadAll(r)
-	if err != nil {
-		glog.V(2).Infof("error ungzip data: %v", err)
-	}
-	return output, err
-}
-
 func IsGzippedContent(data []byte) bool {
 	if len(data) < 2 {
 		return false
diff --git a/weed/util/compression_stream.go b/weed/util/compression_stream.go
new file mode 100644
index 000000000..390100c80
--- /dev/null
+++ b/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)
+}