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compression.go
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99 lines (84 loc) · 1.67 KB
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package mc
import (
"bytes"
"compress/gzip"
"io"
"sync"
)
var (
bytesBuffPool = sync.Pool{
New: func() any {
return &bytes.Buffer{}
},
}
gzipReaderPool = sync.Pool{}
gzipWriterPool = sync.Pool{
New: func() any {
w, err := gzip.NewWriterLevel(nil, gzip.BestSpeed)
if err != nil {
panic("gzip pool bug")
}
return w
},
}
)
func gzipReader(r io.Reader) (*gzip.Reader, error) {
if v, ok := gzipReaderPool.Get().(*gzip.Reader); ok {
if err := v.Reset(r); err != nil {
return nil, err
}
return v, nil
}
return gzip.NewReader(r)
}
func gzipWriter(w io.Writer) *gzip.Writer {
v := gzipWriterPool.Get().(*gzip.Writer)
v.Reset(w)
return v
}
func (c *Client) compress(v []byte) ([]byte, error) {
if c.opts.Compression.Compress != nil {
return c.opts.Compression.Compress(v)
}
return compress(v)
}
func (c *Client) decompress(v []byte) ([]byte, error) {
if c.opts.Compression.Decompress != nil {
return c.opts.Compression.Decompress(v)
}
return decompress(v)
}
func compress(v []byte) ([]byte, error) {
buff := bytesBuffPool.Get().(*bytes.Buffer)
buff.Reset()
w := gzipWriter(buff)
{
w.Write(v)
if err := w.Close(); err != nil {
return nil, err
}
}
size := buff.Len()
if n := size - len(v); n > 0 {
v = append(v, make([]byte, n)...)
}
copy(v, buff.Bytes())
v = v[:size]
gzipWriterPool.Put(w)
bytesBuffPool.Put(buff)
return v, nil
}
func decompress(value []byte) ([]byte, error) {
buff := bytesBuffPool.Get().(*bytes.Buffer)
buff.Reset()
buff.Write(value)
r, err := gzipReader(buff)
if err != nil {
return nil, err
}
defer func() {
bytesBuffPool.Put(buff)
gzipReaderPool.Put(r)
}()
return io.ReadAll(r)
}