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package sarama
import (
"bytes"
"compress/gzip"
"fmt"
"sync"
"github.com/eapache/go-xerial-snappy"
"github.com/pierrec/lz4"
)
var (
lz4WriterPool = sync.Pool{
New: func() interface{} {
return lz4.NewWriter(nil)
},
}
gzipWriterPool = sync.Pool{
New: func() interface{} {
return gzip.NewWriter(nil)
},
}
)
func compress(cc CompressionCodec, level int, data []byte) ([]byte, error) {
switch cc {
case CompressionNone:
return data, nil
case CompressionGZIP:
var (
err error
buf bytes.Buffer
writer *gzip.Writer
)
if level != CompressionLevelDefault {
writer, err = gzip.NewWriterLevel(&buf, level)
if err != nil {
return nil, err
}
} else {
writer = gzipWriterPool.Get().(*gzip.Writer)
defer gzipWriterPool.Put(writer)
writer.Reset(&buf)
}
if _, err := writer.Write(data); err != nil {
return nil, err
}
if err := writer.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
case CompressionSnappy:
return snappy.Encode(data), nil
case CompressionLZ4:
writer := lz4WriterPool.Get().(*lz4.Writer)
defer lz4WriterPool.Put(writer)
var buf bytes.Buffer
writer.Reset(&buf)
if _, err := writer.Write(data); err != nil {
return nil, err
}
if err := writer.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
case CompressionZSTD:
return zstdCompressLevel(nil, data, level)
default:
return nil, PacketEncodingError{fmt.Sprintf("unsupported compression codec (%d)", cc)}
}
}
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