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compressor.go
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compressor.go
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// 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
}