kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | import ( |
| 4 | "sync" |
| 5 | |
| 6 | "github.com/klauspost/compress/zstd" |
| 7 | ) |
| 8 | |
| 9 | type ZstdEncoderParams struct { |
| 10 | Level int |
| 11 | } |
| 12 | type ZstdDecoderParams struct { |
| 13 | } |
| 14 | |
| 15 | var zstdEncMap, zstdDecMap sync.Map |
| 16 | |
| 17 | func getEncoder(params ZstdEncoderParams) *zstd.Encoder { |
| 18 | if ret, ok := zstdEncMap.Load(params); ok { |
| 19 | return ret.(*zstd.Encoder) |
| 20 | } |
| 21 | // It's possible to race and create multiple new writers. |
| 22 | // Only one will survive GC after use. |
| 23 | encoderLevel := zstd.SpeedDefault |
| 24 | if params.Level != CompressionLevelDefault { |
| 25 | encoderLevel = zstd.EncoderLevelFromZstd(params.Level) |
| 26 | } |
| 27 | zstdEnc, _ := zstd.NewWriter(nil, zstd.WithZeroFrames(true), |
| 28 | zstd.WithEncoderLevel(encoderLevel)) |
| 29 | zstdEncMap.Store(params, zstdEnc) |
| 30 | return zstdEnc |
| 31 | } |
| 32 | |
| 33 | func getDecoder(params ZstdDecoderParams) *zstd.Decoder { |
| 34 | if ret, ok := zstdDecMap.Load(params); ok { |
| 35 | return ret.(*zstd.Decoder) |
| 36 | } |
| 37 | // It's possible to race and create multiple new readers. |
| 38 | // Only one will survive GC after use. |
| 39 | zstdDec, _ := zstd.NewReader(nil) |
| 40 | zstdDecMap.Store(params, zstdDec) |
| 41 | return zstdDec |
| 42 | } |
| 43 | |
| 44 | func zstdDecompress(params ZstdDecoderParams, dst, src []byte) ([]byte, error) { |
| 45 | return getDecoder(params).DecodeAll(src, dst) |
| 46 | } |
| 47 | |
| 48 | func zstdCompress(params ZstdEncoderParams, dst, src []byte) ([]byte, error) { |
| 49 | return getEncoder(params).EncodeAll(src, dst), nil |
| 50 | } |