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// Copyright 2022 Mostyn Bramley-Moore.
//
// 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 s2 is an experimental wrapper for using
// github.com/klauspost/compress/s2 stream compression with gRPC.
package s2
import (
"io"
"io/ioutil"
"sync"
"github.com/klauspost/compress/s2"
"google.golang.org/grpc/encoding"
)
const Name = "s2"
type compressor struct {
poolCompressor sync.Pool
poolDecompressor sync.Pool
}
type writer struct {
*s2.Writer
pool *sync.Pool
}
type reader struct {
*s2.Reader
pool *sync.Pool
}
func PretendInit(clobbering bool) {
if !clobbering && encoding.GetCompressor(Name) != nil {
return
}
c := &compressor{}
c.poolCompressor.New = func() interface{} {
w := s2.NewWriter(ioutil.Discard, s2.WriterConcurrency(1))
return &writer{Writer: w, pool: &c.poolCompressor}
}
encoding.RegisterCompressor(c)
}
func (c *compressor) Compress(w io.Writer) (io.WriteCloser, error) {
s := c.poolCompressor.Get().(*writer)
s.Writer.Reset(w)
return s, nil
}
func (c *compressor) Decompress(r io.Reader) (io.Reader, error) {
s, inPool := c.poolDecompressor.Get().(*reader)
if !inPool {
newR := s2.NewReader(r)
return &reader{Reader: newR, pool: &c.poolDecompressor}, nil
}
s.Reset(r)
return s, nil
}
func (c *compressor) Name() string {
return Name
}
func (s *writer) Close() error {
err := s.Writer.Close()
s.pool.Put(s)
return err
}
func (s *reader) Read(p []byte) (n int, err error) {
n, err = s.Reader.Read(p)
if err == io.EOF {
s.pool.Put(s)
}
return n, err
}
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