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Merge branch '2428-iss-gzip-tune' into 'dev'
Resolve "替换现有 gzip 实现" See merge request cloudcare-tools/datakit!3244
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // Unless explicitly stated otherwise all files in this repository are licensed | ||
| // under the MIT License. | ||
| // This product includes software developed at Guance Cloud (https://www.guance.com/). | ||
| // Copyright 2021-present Guance, Inc. | ||
|
|
||
| package dataway | ||
|
|
||
| import ( | ||
| bytes "bytes" | ||
| "sync" | ||
|
|
||
| gzip "github.com/klauspost/compress/gzip" | ||
| ) | ||
|
|
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| var zippool sync.Pool | ||
|
|
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| func getZipper() *gzipWriter { | ||
| if x := zippool.Get(); x == nil { | ||
| buf := bytes.Buffer{} | ||
| w := gzip.NewWriter(&buf) | ||
| return &gzipWriter{buf: &buf, w: w} | ||
| } else { | ||
| return x.(*gzipWriter) | ||
| } | ||
| } | ||
|
|
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| func putZipper(z *gzipWriter) { | ||
| if z != nil { | ||
| // reset zip buffer and the writer. | ||
| z.buf.Reset() | ||
| z.w.Reset(z.buf) | ||
| zippool.Put(z) | ||
| } | ||
| } | ||
|
|
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| type gzipWriter struct { | ||
| buf *bytes.Buffer | ||
| w *gzip.Writer | ||
| } | ||
|
|
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| func (z *gzipWriter) zip(data []byte) ([]byte, error) { | ||
| if _, err := z.w.Write(data); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if err := z.w.Flush(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if err := z.w.Close(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return z.buf.Bytes(), nil | ||
| } | ||
|
|
||
| func isGzip(data []byte) int8 { | ||
| if len(data) < 2 { | ||
| return -1 | ||
| } | ||
|
|
||
| // See: https://stackoverflow.com/a/6059342/342348 | ||
| if data[0] == 0x1f && data[1] == 0x8b { | ||
| return 1 | ||
| } else { | ||
| return 0 | ||
| } | ||
| } |
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