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