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[opt]: compress write data by re-use snappy streaming (#1027)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| // Licensed to LinDB under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. LinDB licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| package compress | ||
|
|
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| import ( | ||
| "bytes" | ||
| "io" | ||
|
|
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| "github.com/klauspost/compress/snappy" | ||
| ) | ||
|
|
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| // Writer represents compress writer. | ||
| type Writer interface { | ||
| io.Writer | ||
| io.Closer | ||
| // Bytes returns compressed binary data. | ||
| Bytes() []byte | ||
| } | ||
|
|
||
| // Reader represents uncompress reader. | ||
| type Reader interface { | ||
| // Uncompress de-compresses compressed binary data. | ||
| Uncompress(compressData []byte) ([]byte, error) | ||
| } | ||
|
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| type snappyWriter struct { | ||
| writer *snappy.Writer | ||
| buffer bytes.Buffer | ||
| } | ||
|
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| // NewBufferedWriter creates a snappy compress writer. | ||
| func NewSnappyWriter() Writer { | ||
| w := &snappyWriter{} | ||
| w.writer = snappy.NewBufferedWriter(&w.buffer) | ||
| return w | ||
| } | ||
|
|
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| func (w *snappyWriter) Write(row []byte) (n int, err error) { | ||
| n, err = w.writer.Write(row) | ||
| return n, err | ||
| } | ||
|
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| func (w *snappyWriter) Bytes() (r []byte) { | ||
| // TODO: opts bytes copy? | ||
| data := w.buffer.Bytes() | ||
| r = make([]byte, len(data)) | ||
| copy(r, data) | ||
|
|
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| // reset compress context | ||
| w.buffer.Reset() | ||
| w.writer.Reset(&w.buffer) | ||
| return | ||
| } | ||
|
|
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| func (w *snappyWriter) Close() error { | ||
| return w.writer.Close() | ||
| } | ||
|
|
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| type snappyReader struct { | ||
| reader *snappy.Reader | ||
| compressed bytes.Buffer | ||
| decompressed bytes.Buffer | ||
| } | ||
|
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| // NewSnappyReader creates a snappy uncompress reader. | ||
| func NewSnappyReader() Reader { | ||
| r := &snappyReader{} | ||
| r.reader = snappy.NewReader(&r.compressed) | ||
| return r | ||
| } | ||
|
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| func (r *snappyReader) Uncompress(compressData []byte) ([]byte, error) { | ||
| defer func() { | ||
| // reset uncompress context | ||
| r.compressed.Reset() | ||
| r.decompressed.Reset() | ||
| r.reader.Reset(&r.compressed) | ||
| }() | ||
| _, err := r.compressed.Write(compressData) | ||
|
|
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| if err == nil { | ||
| _, err = io.Copy(&r.decompressed, r.reader) | ||
| } | ||
|
|
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| if err != nil { | ||
| return nil, err | ||
| } | ||
| return r.decompressed.Bytes(), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| // Licensed to LinDB under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. LinDB licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| package compress | ||
|
|
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| import ( | ||
| "testing" | ||
|
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| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
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| func Test_Snappy(t *testing.T) { | ||
| data := []byte("hello snappy") | ||
| w := NewSnappyWriter() | ||
| _, err := w.Write(data) | ||
| assert.NoError(t, err) | ||
| err = w.Close() | ||
| assert.NoError(t, err) | ||
| compress := w.Bytes() | ||
|
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| r := NewSnappyReader() | ||
| dst, err := r.Uncompress(compress) | ||
| assert.NoError(t, err) | ||
| assert.Equal(t, data, dst) | ||
| } |
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