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@@ -128,6 +128,8 @@ const ( | |
| Gzip = "gzip" | ||
| // Br brotli compress | ||
| Br = "br" | ||
| // Zstd zstd compress | ||
| Zstd = "zstd" | ||
| ) | ||
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| var ( | ||
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| @@ -0,0 +1,120 @@ | ||
| // MIT License | ||
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| // Copyright (c) 2023 Tree Xie | ||
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| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
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| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
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| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
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| package middleware | ||
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| import ( | ||
| "bytes" | ||
| "io" | ||
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| "github.com/klauspost/compress/zstd" | ||
| "github.com/vicanso/elton" | ||
| ) | ||
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| type ( | ||
| // ZstdCompressor zstd compress | ||
| ZstdCompressor struct { | ||
| Level int | ||
| MinLength int | ||
| } | ||
| ) | ||
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| // Accept accept zstd encoding | ||
| func (z *ZstdCompressor) Accept(c *elton.Context, bodySize int) (bool, string) { | ||
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| // 如果数据少于最低压缩长度，则不压缩（因为reader中的bodySize会设置为1，因此需要判断>=0） | ||
| if bodySize >= 0 && bodySize < z.getMinLength() { | ||
| return false, "" | ||
| } | ||
| return AcceptEncoding(c, elton.Zstd) | ||
| } | ||
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| func (z *ZstdCompressor) getLevel() int { | ||
| level := z.Level | ||
| if level <= 0 { | ||
| level = int(zstd.SpeedBetterCompression) | ||
| } | ||
| if level > int(zstd.SpeedBestCompression) { | ||
| level = int(zstd.SpeedBestCompression) | ||
| } | ||
| return level | ||
| } | ||
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| func (z *ZstdCompressor) getMinLength() int { | ||
| if z.MinLength == 0 { | ||
| return DefaultCompressMinLength | ||
| } | ||
| return z.MinLength | ||
| } | ||
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| // Compress compress data by zstd | ||
| func (z *ZstdCompressor) Compress(buf []byte, levels ...int) (*bytes.Buffer, error) { | ||
| level := z.getLevel() | ||
| if len(levels) != 0 && levels[0] != IgnoreCompression { | ||
| level = levels[0] | ||
| } | ||
| return GzipCompress(buf, level) | ||
| } | ||
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| // Pipe compress by pipe | ||
| func (z *ZstdCompressor) Pipe(c *elton.Context) error { | ||
| r := c.Body.(io.Reader) | ||
| closer, ok := c.Body.(io.Closer) | ||
| if ok { | ||
| defer closer.Close() | ||
| } | ||
| enc, err := zstd.NewWriter(c.Response, zstd.WithEncoderLevel(zstd.EncoderLevel(z.getLevel()))) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| _, err = io.Copy(enc, r) | ||
| if err != nil { | ||
| enc.Close() | ||
| return err | ||
| } | ||
| return enc.Close() | ||
| } | ||
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| // ZstdCompressor compress data by zstd | ||
| func ZstdCompress(buf []byte, level int) (*bytes.Buffer, error) { | ||
| encoder, err := zstd.NewWriter(nil, zstd.WithEncoderLevel(zstd.EncoderLevel(level))) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| dst := encoder.EncodeAll(buf, make([]byte, 0, len(buf))) | ||
| return bytes.NewBuffer(dst), nil | ||
| } | ||
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| // ZstdDecompress decompress data of zstd | ||
| func ZstdDecompress(buf []byte) (*bytes.Buffer, error) { | ||
| r, err := zstd.NewReader(bytes.NewBuffer(buf)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer r.Close() | ||
| data, err := io.ReadAll(r) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return bytes.NewBuffer(data), nil | ||
| } |