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package compression
import (
"bytes"
"compress/gzip"
"fmt"
"io"
"github.com/golang/snappy"
"github.com/klauspost/compress/zstd"
"github.com/pierrec/lz4/v4"
)
// nopCloser wraps an io.Reader to provide a no-op Close method
type nopCloser struct {
io.Reader
}
func (nopCloser) Close() error { return nil }
// CompressionCodec represents the compression codec used in Kafka record batches
type CompressionCodec int8
const (
None CompressionCodec = 0
Gzip CompressionCodec = 1
Snappy CompressionCodec = 2
Lz4 CompressionCodec = 3
Zstd CompressionCodec = 4
)
// String returns the string representation of the compression codec
func (c CompressionCodec) String() string {
switch c {
case None:
return "none"
case Gzip:
return "gzip"
case Snappy:
return "snappy"
case Lz4:
return "lz4"
case Zstd:
return "zstd"
default:
return fmt.Sprintf("unknown(%d)", c)
}
}
// IsValid returns true if the compression codec is valid
func (c CompressionCodec) IsValid() bool {
return c >= None && c <= Zstd
}
// ExtractCompressionCodec extracts the compression codec from record batch attributes
func ExtractCompressionCodec(attributes int16) CompressionCodec {
return CompressionCodec(attributes & 0x07) // Lower 3 bits
}
// SetCompressionCodec sets the compression codec in record batch attributes
func SetCompressionCodec(attributes int16, codec CompressionCodec) int16 {
return (attributes &^ 0x07) | int16(codec)
}
// Compress compresses data using the specified codec
func Compress(codec CompressionCodec, data []byte) ([]byte, error) {
if codec == None {
return data, nil
}
var buf bytes.Buffer
var writer io.WriteCloser
var err error
switch codec {
case Gzip:
writer = gzip.NewWriter(&buf)
case Snappy:
// Snappy doesn't have a streaming writer, so we compress directly
compressed := snappy.Encode(nil, data)
if compressed == nil {
compressed = []byte{}
}
return compressed, nil
case Lz4:
writer = lz4.NewWriter(&buf)
case Zstd:
writer, err = zstd.NewWriter(&buf)
if err != nil {
return nil, fmt.Errorf("failed to create zstd writer: %w", err)
}
default:
return nil, fmt.Errorf("unsupported compression codec: %s", codec)
}
if _, err := writer.Write(data); err != nil {
writer.Close()
return nil, fmt.Errorf("failed to write compressed data: %w", err)
}
if err := writer.Close(); err != nil {
return nil, fmt.Errorf("failed to close compressor: %w", err)
}
return buf.Bytes(), nil
}
// Decompress decompresses data using the specified codec
func Decompress(codec CompressionCodec, data []byte) ([]byte, error) {
if codec == None {
return data, nil
}
var reader io.ReadCloser
var err error
buf := bytes.NewReader(data)
switch codec {
case Gzip:
reader, err = gzip.NewReader(buf)
if err != nil {
return nil, fmt.Errorf("failed to create gzip reader: %w", err)
}
case Snappy:
// Snappy doesn't have a streaming reader, so we decompress directly
decompressed, err := snappy.Decode(nil, data)
if err != nil {
return nil, fmt.Errorf("failed to decompress snappy data: %w", err)
}
if decompressed == nil {
decompressed = []byte{}
}
return decompressed, nil
case Lz4:
lz4Reader := lz4.NewReader(buf)
// lz4.Reader doesn't implement Close, so we wrap it
reader = &nopCloser{Reader: lz4Reader}
case Zstd:
zstdReader, err := zstd.NewReader(buf)
if err != nil {
return nil, fmt.Errorf("failed to create zstd reader: %w", err)
}
defer zstdReader.Close()
var result bytes.Buffer
if _, err := io.Copy(&result, zstdReader); err != nil {
return nil, fmt.Errorf("failed to decompress zstd data: %w", err)
}
decompressed := result.Bytes()
if decompressed == nil {
decompressed = []byte{}
}
return decompressed, nil
default:
return nil, fmt.Errorf("unsupported compression codec: %s", codec)
}
defer reader.Close()
var result bytes.Buffer
if _, err := io.Copy(&result, reader); err != nil {
return nil, fmt.Errorf("failed to decompress data: %w", err)
}
decompressed := result.Bytes()
if decompressed == nil {
decompressed = []byte{}
}
return decompressed, nil
}
// CompressRecordBatch compresses the records portion of a Kafka record batch
// This function compresses only the records data, not the entire batch header
func CompressRecordBatch(codec CompressionCodec, recordsData []byte) ([]byte, int16, error) {
if codec == None {
return recordsData, 0, nil
}
compressed, err := Compress(codec, recordsData)
if err != nil {
return nil, 0, fmt.Errorf("failed to compress record batch: %w", err)
}
attributes := int16(codec)
return compressed, attributes, nil
}
// DecompressRecordBatch decompresses the records portion of a Kafka record batch
func DecompressRecordBatch(attributes int16, compressedData []byte) ([]byte, error) {
codec := ExtractCompressionCodec(attributes)
if codec == None {
return compressedData, nil
}
decompressed, err := Decompress(codec, compressedData)
if err != nil {
return nil, fmt.Errorf("failed to decompress record batch: %w", err)
}
return decompressed, nil
}
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