复制项目

internal/msggateway/compressor.go

@@ -0,0 +1,113 @@
+// Copyright © 2023 OpenIM. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package msggateway
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io"
+	"sync"
+
+	"github.com/openimsdk/tools/errs"
+)
+
+var (
+	gzipWriterPool = sync.Pool{New: func() any { return gzip.NewWriter(nil) }}
+	gzipReaderPool = sync.Pool{New: func() any { return new(gzip.Reader) }}
+)
+
+type Compressor interface {
+	Compress(rawData []byte) ([]byte, error)
+	CompressWithPool(rawData []byte) ([]byte, error)
+	DeCompress(compressedData []byte) ([]byte, error)
+	DecompressWithPool(compressedData []byte) ([]byte, error)
+}
+
+type GzipCompressor struct {
+	compressProtocol string
+}
+
+func NewGzipCompressor() *GzipCompressor {
+	return &GzipCompressor{compressProtocol: "gzip"}
+}
+
+func (g *GzipCompressor) Compress(rawData []byte) ([]byte, error) {
+	gzipBuffer := bytes.Buffer{}
+	gz := gzip.NewWriter(&gzipBuffer)
+
+	if _, err := gz.Write(rawData); err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.Compress: writing to gzip writer failed")
+	}
+
+	if err := gz.Close(); err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.Compress: closing gzip writer failed")
+	}
+
+	return gzipBuffer.Bytes(), nil
+}
+
+func (g *GzipCompressor) CompressWithPool(rawData []byte) ([]byte, error) {
+	gz := gzipWriterPool.Get().(*gzip.Writer)
+	defer gzipWriterPool.Put(gz)
+
+	gzipBuffer := bytes.Buffer{}
+	gz.Reset(&gzipBuffer)
+
+	if _, err := gz.Write(rawData); err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.CompressWithPool: error writing data")
+	}
+	if err := gz.Close(); err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.CompressWithPool: error closing gzip writer")
+	}
+	return gzipBuffer.Bytes(), nil
+}
+
+func (g *GzipCompressor) DeCompress(compressedData []byte) ([]byte, error) {
+	buff := bytes.NewBuffer(compressedData)
+	reader, err := gzip.NewReader(buff)
+	if err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.DeCompress: NewReader creation failed")
+	}
+	decompressedData, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.DeCompress: reading from gzip reader failed")
+	}
+	if err = reader.Close(); err != nil {
+		// Even if closing the reader fails, we've successfully read the data,
+		// so we return the decompressed data and an error indicating the close failure.
+		return decompressedData, errs.WrapMsg(err, "GzipCompressor.DeCompress: closing gzip reader failed")
+	}
+	return decompressedData, nil
+}
+
+func (g *GzipCompressor) DecompressWithPool(compressedData []byte) ([]byte, error) {
+	reader := gzipReaderPool.Get().(*gzip.Reader)
+	defer gzipReaderPool.Put(reader)
+
+	err := reader.Reset(bytes.NewReader(compressedData))
+	if err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.DecompressWithPool: resetting gzip reader failed")
+	}
+
+	decompressedData, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, errs.WrapMsg(err, "GzipCompressor.DecompressWithPool: reading from pooled gzip reader failed")
+	}
+	if err = reader.Close(); err != nil {
+		// Similar to DeCompress, return the data and error for close failure.
+		return decompressedData, errs.WrapMsg(err, "GzipCompressor.DecompressWithPool: closing pooled gzip reader failed")
+	}
+	return decompressedData, nil
+}