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Merge pull request #15 from vinted/query_add_zstd_support
query: add zstd/snappy compression support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // Copyright (c) The Thanos Authors. | ||
| // Licensed under the Apache License 2.0. | ||
|
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||
| package snappy | ||
|
|
||
| import ( | ||
| "io" | ||
| "sync" | ||
|
|
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| "github.com/klauspost/compress/snappy" | ||
| "google.golang.org/grpc/encoding" | ||
| ) | ||
|
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| // Name is the name registered for the snappy compressor. | ||
| const Name = "snappy" | ||
|
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| func init() { | ||
| encoding.RegisterCompressor(newCompressor()) | ||
| } | ||
|
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| type compressor struct { | ||
| writersPool sync.Pool | ||
| readersPool sync.Pool | ||
| } | ||
|
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| func newCompressor() *compressor { | ||
| c := &compressor{} | ||
| c.readersPool = sync.Pool{ | ||
| New: func() interface{} { | ||
| return snappy.NewReader(nil) | ||
| }, | ||
| } | ||
| c.writersPool = sync.Pool{ | ||
| New: func() interface{} { | ||
| return snappy.NewBufferedWriter(nil) | ||
| }, | ||
| } | ||
| return c | ||
| } | ||
|
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| func (c *compressor) Name() string { | ||
| return Name | ||
| } | ||
|
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| func (c *compressor) Compress(w io.Writer) (io.WriteCloser, error) { | ||
| wr := c.writersPool.Get().(*snappy.Writer) | ||
| wr.Reset(w) | ||
| return writeCloser{wr, &c.writersPool}, nil | ||
| } | ||
|
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| func (c *compressor) Decompress(r io.Reader) (io.Reader, error) { | ||
| dr := c.readersPool.Get().(*snappy.Reader) | ||
| dr.Reset(r) | ||
| return reader{dr, &c.readersPool}, nil | ||
| } | ||
|
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| type writeCloser struct { | ||
| writer *snappy.Writer | ||
| pool *sync.Pool | ||
| } | ||
|
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| func (w writeCloser) Write(p []byte) (n int, err error) { | ||
| return w.writer.Write(p) | ||
| } | ||
|
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| func (w writeCloser) Close() error { | ||
| defer func() { | ||
| w.writer.Reset(nil) | ||
| w.pool.Put(w.writer) | ||
| }() | ||
|
|
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| if w.writer != nil { | ||
| return w.writer.Close() | ||
| } | ||
| return nil | ||
| } | ||
|
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| type reader struct { | ||
| reader *snappy.Reader | ||
| pool *sync.Pool | ||
| } | ||
|
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| func (r reader) Read(p []byte) (n int, err error) { | ||
| n, err = r.reader.Read(p) | ||
| if err == io.EOF { | ||
| r.reader.Reset(nil) | ||
| r.pool.Put(r.reader) | ||
| } | ||
| return n, err | ||
| } |