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package sarama
import (
"bytes"
"fmt"
"sync"
snappy "github.com/eapache/go-xerial-snappy"
"github.com/klauspost/compress/gzip"
"github.com/pierrec/lz4/v4"
)
var (
lz4WriterPool = sync.Pool{
New: func() interface{} {
lz := lz4.NewWriter(nil)
if err := lz.Apply(lz4.BlockSizeOption(lz4.Block64Kb)); err != nil {
panic(err)
}
return lz
},
}
gzipWriterPool = sync.Pool{
New: func() interface{} {
return gzip.NewWriter(nil)
},
}
gzipWriterPoolForCompressionLevel1 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 1)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel2 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 2)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel3 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 3)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel4 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 4)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel5 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 5)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel6 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 6)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel7 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 7)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel8 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 8)
if err != nil {
panic(err)
}
return gz
},
}
gzipWriterPoolForCompressionLevel9 = sync.Pool{
New: func() interface{} {
gz, err := gzip.NewWriterLevel(nil, 9)
if err != nil {
panic(err)
}
return gz
},
}
)
func compress(cc CompressionCodec, level int, data []byte) ([]byte, error) {
switch cc {
case CompressionNone:
return data, nil
case CompressionGZIP:
return gzipCompress(level, data)
case CompressionSnappy:
return snappy.Encode(data), nil
case CompressionLZ4:
return lz4Compress(data)
case CompressionZSTD:
return zstdCompress(ZstdEncoderParams{level}, nil, data)
default:
return nil, PacketEncodingError{fmt.Sprintf("unsupported compression codec (%d)", cc)}
}
}
func gzipCompress(level int, data []byte) ([]byte, error) {
var (
buf bytes.Buffer
writer *gzip.Writer
pool *sync.Pool
)
switch level {
case CompressionLevelDefault:
pool = &gzipWriterPool
case 1:
pool = &gzipWriterPoolForCompressionLevel1
case 2:
pool = &gzipWriterPoolForCompressionLevel2
case 3:
pool = &gzipWriterPoolForCompressionLevel3
case 4:
pool = &gzipWriterPoolForCompressionLevel4
case 5:
pool = &gzipWriterPoolForCompressionLevel5
case 6:
pool = &gzipWriterPoolForCompressionLevel6
case 7:
pool = &gzipWriterPoolForCompressionLevel7
case 8:
pool = &gzipWriterPoolForCompressionLevel8
case 9:
pool = &gzipWriterPoolForCompressionLevel9
default:
var err error
writer, err = gzip.NewWriterLevel(&buf, level)
if err != nil {
return nil, err
}
}
if pool != nil {
writer = pool.Get().(*gzip.Writer)
writer.Reset(&buf)
defer pool.Put(writer)
}
if _, err := writer.Write(data); err != nil {
return nil, err
}
if err := writer.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func lz4Compress(data []byte) ([]byte, error) {
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
}
|
