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87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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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// grpc zstd implementation from https://github.com/cortexproject/cortex
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package grpcclient
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import (
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"bytes"
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"io"
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"github.com/klauspost/compress/zstd"
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"google.golang.org/grpc/encoding"
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)
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const (
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None = ""
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Zstd = "zstd"
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)
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type grpcCompressor struct {
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encoder *zstd.Encoder
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decoder *zstd.Decoder
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}
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func init() {
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enc, _ := zstd.NewWriter(nil)
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dec, _ := zstd.NewReader(nil)
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c := &grpcCompressor{
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encoder: enc,
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decoder: dec,
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}
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encoding.RegisterCompressor(c)
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}
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func (c *grpcCompressor) Compress(w io.Writer) (io.WriteCloser, error) {
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return &zstdWriteCloser{
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enc: c.encoder,
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writer: w,
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}, nil
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}
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type zstdWriteCloser struct {
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enc *zstd.Encoder
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writer io.Writer // Compressed data will be written here.
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buf bytes.Buffer // Buffer uncompressed data here, compress on Close.
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}
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func (z *zstdWriteCloser) Write(p []byte) (int, error) {
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return z.buf.Write(p)
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}
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func (z *zstdWriteCloser) Close() error {
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compressed := z.enc.EncodeAll(z.buf.Bytes(), nil)
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_, err := io.Copy(z.writer, bytes.NewReader(compressed))
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return err
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}
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func (c *grpcCompressor) Decompress(r io.Reader) (io.Reader, error) {
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compressed, err := io.ReadAll(r)
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if err != nil {
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return nil, err
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}
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uncompressed, err := c.decoder.DecodeAll(compressed, nil)
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if err != nil {
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return nil, err
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}
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return bytes.NewReader(uncompressed), nil
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}
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func (c *grpcCompressor) Name() string {
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return Zstd
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}
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