You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
3.7 KiB
114 lines
3.7 KiB
// 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
|
|
}
|