github.com/cloudwego/kitex@v0.9.0/pkg/remote/codec/grpc/grpc_compress.go (about)

     1  /*
     2   * Copyright 2023 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package grpc
    18  
    19  import (
    20  	"bytes"
    21  	"context"
    22  	"encoding/binary"
    23  	"errors"
    24  	"io"
    25  
    26  	"github.com/cloudwego/kitex/pkg/rpcinfo"
    27  
    28  	"github.com/bytedance/gopkg/lang/mcache"
    29  
    30  	"github.com/cloudwego/kitex/pkg/remote/codec/protobuf/encoding"
    31  
    32  	"github.com/cloudwego/kitex/pkg/remote"
    33  )
    34  
    35  func getSendCompressor(ctx context.Context) (encoding.Compressor, error) {
    36  	ri := rpcinfo.GetRPCInfo(ctx)
    37  	return encoding.FindCompressor(remote.GetSendCompressor(ri))
    38  }
    39  
    40  func decodeGRPCFrame(ctx context.Context, in remote.ByteBuffer) ([]byte, error) {
    41  	ri := rpcinfo.GetRPCInfo(ctx)
    42  	compressor, err := encoding.FindCompressor(remote.GetRecvCompressor(ri))
    43  	if err != nil {
    44  		return nil, err
    45  	}
    46  	hdr, err := in.Next(5)
    47  	if err != nil {
    48  		return nil, err
    49  	}
    50  	compressFlag := hdr[0]
    51  	dLen := int(binary.BigEndian.Uint32(hdr[1:]))
    52  	d, err := in.Next(dLen)
    53  	if err != nil {
    54  		return nil, err
    55  	}
    56  	if compressFlag == 1 {
    57  		if compressor == nil {
    58  			return nil, errors.New("kitex compression algorithm not found")
    59  		}
    60  		return decompress(compressor, d)
    61  	}
    62  	return d, nil
    63  }
    64  
    65  func compress(compressor encoding.Compressor, data []byte) ([]byte, error) {
    66  	defer mcache.Free(data)
    67  	cbuf := &bytes.Buffer{}
    68  	z, err := compressor.Compress(cbuf)
    69  	if err != nil {
    70  		return nil, err
    71  	}
    72  	if _, err = z.Write(data); err != nil {
    73  		return nil, err
    74  	}
    75  	if err = z.Close(); err != nil {
    76  		return nil, err
    77  	}
    78  	return cbuf.Bytes(), nil
    79  }
    80  
    81  func decompress(compressor encoding.Compressor, data []byte) ([]byte, error) {
    82  	dcReader, er := compressor.Decompress(bytes.NewReader(data))
    83  	if er != nil {
    84  		return nil, er
    85  	}
    86  	var buf bytes.Buffer
    87  	_, err := io.Copy(&buf, dcReader)
    88  	if err != nil {
    89  		return nil, err
    90  	}
    91  	return buf.Bytes(), nil
    92  }