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GT-575 Transparent compression of requests and responses (#598)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| // | ||
| // DISCLAIMER | ||
| // | ||
| // Copyright 2024 ArangoDB GmbH, Cologne, Germany | ||
| // | ||
| // Licensed 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. | ||
| // | ||
| // Copyright holder is ArangoDB GmbH, Cologne, Germany | ||
| // | ||
|
|
||
| package connection | ||
|
|
||
| import ( | ||
| "compress/zlib" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/arangodb/go-driver/v2/log" | ||
| ) | ||
|
|
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| type Compression interface { | ||
| ApplyRequestHeaders(r Request) | ||
| ApplyRequestCompression(r *httpRequest, rootWriter io.Writer) (io.WriteCloser, error) | ||
| } | ||
|
|
||
| func newCompression(config *CompressionConfig) Compression { | ||
| if config == nil { | ||
| return noCompression{} | ||
| } else if config.CompressionType == "gzip" { | ||
| return gzipCompression{config: config} | ||
| } else if config.CompressionType == "deflate" { | ||
| return deflateCompression{config: config} | ||
| } else { | ||
| log.Error(fmt.Errorf("unknown compression type: %s", config.CompressionType), "") | ||
| return noCompression{config: config} | ||
| } | ||
| } | ||
|
|
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| type gzipCompression struct { | ||
| config *CompressionConfig | ||
| } | ||
|
|
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| func (g gzipCompression) ApplyRequestHeaders(r Request) { | ||
| if g.config != nil && g.config.ResponseCompressionEnabled { | ||
| if g.config.CompressionType == "gzip" { | ||
| r.AddHeader("Accept-Encoding", "gzip") | ||
| } | ||
| } | ||
| } | ||
|
|
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| func (g gzipCompression) ApplyRequestCompression(r *httpRequest, rootWriter io.Writer) (io.WriteCloser, error) { | ||
| config := g.config | ||
|
|
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| if config != nil && config.RequestCompressionEnabled { | ||
| if config.CompressionType == "deflate" { | ||
| r.headers["Content-Encoding"] = "deflate" | ||
|
|
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| zlibWriter, err := zlib.NewWriterLevel(rootWriter, config.RequestCompressionLevel) | ||
| if err != nil { | ||
| log.Errorf(err, "error creating zlib writer") | ||
| return nil, err | ||
| } | ||
|
|
||
| return zlibWriter, nil | ||
| } | ||
| } | ||
|
|
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| return nil, nil | ||
| } | ||
|
|
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| type deflateCompression struct { | ||
| config *CompressionConfig | ||
| } | ||
|
|
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| func (g deflateCompression) ApplyRequestHeaders(r Request) { | ||
| if g.config != nil && g.config.ResponseCompressionEnabled { | ||
| if g.config.CompressionType == "deflate" { | ||
| r.AddHeader("Accept-Encoding", "deflate") | ||
| } | ||
| } | ||
| } | ||
|
|
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| func (g deflateCompression) ApplyRequestCompression(r *httpRequest, rootWriter io.Writer) (io.WriteCloser, error) { | ||
| config := g.config | ||
|
|
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| if config != nil && config.RequestCompressionEnabled { | ||
| if config.CompressionType == "deflate" { | ||
| r.headers["Content-Encoding"] = "deflate" | ||
|
|
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| zlibWriter, err := zlib.NewWriterLevel(rootWriter, config.RequestCompressionLevel) | ||
| if err != nil { | ||
| log.Errorf(err, "error creating zlib writer") | ||
| return nil, err | ||
| } | ||
|
|
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| return zlibWriter, nil | ||
| } | ||
| } | ||
|
|
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| return nil, nil | ||
| } | ||
|
|
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| type noCompression struct { | ||
| config *CompressionConfig | ||
| } | ||
|
|
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| func (g noCompression) ApplyRequestHeaders(r Request) { | ||
| } | ||
|
|
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| func (g noCompression) ApplyRequestCompression(r *httpRequest, rootWriter io.Writer) (io.WriteCloser, error) { | ||
| return nil, nil | ||
| } |
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