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adding gzip compression support to the schema #4220
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * (c) Copyright 2019 Palantir Technologies Inc. All rights reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
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| package com.palantir.common.compression; | ||
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| import java.io.BufferedInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.util.Arrays; | ||
| import java.util.Comparator; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.function.UnaryOperator; | ||
| import java.util.stream.Collectors; | ||
| import java.util.zip.GZIPInputStream; | ||
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| import com.google.common.collect.MoreCollectors; | ||
| import com.google.common.io.ByteStreams; | ||
| import com.palantir.common.base.Throwables; | ||
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| import net.jpountz.lz4.LZ4BlockInputStream; | ||
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| public enum ClientCompressor { | ||
| GZIP(in -> { | ||
| try { | ||
| return new GzipCompressingInputStream(in); | ||
| } catch (Exception exc) { | ||
| throw new RuntimeException(exc); | ||
| } | ||
| }, in -> { | ||
| try { | ||
| return new GZIPInputStream(in); | ||
| } catch (Exception exc) { | ||
| throw new RuntimeException(exc); | ||
| } | ||
| }, GzipCompressingInputStream.GZIP_HEADER), | ||
| LZ4(LZ4CompressingInputStream::new, LZ4BlockInputStream::new, | ||
| new byte[] {'L', 'Z', '4', 'B', 'l', 'o', 'c', 'k'}), | ||
| NONE(null, UnaryOperator.identity(), new byte[] {}); | ||
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| private final UnaryOperator<InputStream> compressorCreator; | ||
| private UnaryOperator<InputStream> decompressorCreator; | ||
| public final byte[] magic; | ||
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| ClientCompressor(UnaryOperator<InputStream> compressorCreator, UnaryOperator<InputStream> decompressorCreator, | ||
| byte[] magic) { | ||
| this.compressorCreator = compressorCreator; | ||
| this.decompressorCreator = decompressorCreator; | ||
| this.magic = magic; | ||
| } | ||
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| public InputStream getCompressor(InputStream stream) { | ||
| return compressorCreator.apply(stream); | ||
| } | ||
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| private boolean matchMagic(byte[] buffer, int bufferLen) { | ||
| int i = 0; | ||
| while (i < magic.length && i < bufferLen && magic[i] == buffer[i++]); | ||
| return i >= magic.length && magic.length > 0; | ||
| } | ||
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| /** | ||
| * Method that takes a compressed stream and returns a decompressor stream. It will throw {@code | ||
| * IllegalArgumentException} if more than one decompressor is detected, a {@code NoSuchElementException} if no | ||
| * compressor detected. | ||
| */ | ||
| static InputStream getDecompressorStream(InputStream stream) throws IOException { | ||
| BufferedInputStream buff = new BufferedInputStream(stream); | ||
| List<ClientCompressor> compressors = Arrays.stream(ClientCompressor.values()).sorted( | ||
| Comparator.comparingInt((ClientCompressor t) -> t.magic.length).reversed() | ||
| ).collect( | ||
| Collectors.toList()); | ||
| int maxLen = compressors.get(0).magic.length; | ||
|
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There was a problem hiding this comment. can avoid all of the sorting and reversing stuff :) There was a problem hiding this comment. hey @j-baker , but i need to start from the longest prefix, otherwise a shorter magic char which is a substring of another magic char would cause a bug. the purpose of this code was not only to find the maxlen. |
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| buff.mark(maxLen); | ||
| byte[] headerBuffer = new byte[maxLen]; | ||
| int len = ByteStreams.read(buff, headerBuffer, 0, maxLen); | ||
| buff.reset(); | ||
| ClientCompressor compressor = compressors.stream().filter( | ||
| t -> t.magic.length <= len && t.matchMagic(headerBuffer, len)).collect(MoreCollectors.onlyElement()); | ||
| return compressor.decompressorCreator.apply(buff); | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /* | ||
| * (c) Copyright 2019 Palantir Technologies Inc. All rights reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
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| package com.palantir.common.compression; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| public class CompressorForwardingInputStream extends InputStream { | ||
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| private InputStream compressedStream; | ||
| private InputStream delegate; | ||
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| public CompressorForwardingInputStream(InputStream stream) { | ||
| compressedStream = stream; | ||
| } | ||
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| @Override | ||
| public int read() throws IOException { | ||
| initializeDelegate(); | ||
| return delegate.read(); | ||
| } | ||
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| @Override | ||
| public int read(byte b[], int off, int len) throws IOException { | ||
| initializeDelegate(); | ||
| return delegate.read(b, off, len); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| if (delegate != null) { | ||
| delegate.close(); | ||
| } | ||
| } | ||
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| private void initializeDelegate() throws IOException { | ||
| if (delegate == null) { | ||
| delegate = ClientCompressor.getDecompressorStream(compressedStream); | ||
| } | ||
| } | ||
| } | ||
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"LZ4Block".getBytes(StandardCharsets.UTF_8)There was a problem hiding this comment.
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this looks nicer but different than the original implementation. Unfortunately the access modifier does not allow to use it.
https://github.com/lz4/lz4-java/blob/d43546e24388533eebd40fccb4be5468f0411788/src/java/net/jpountz/lz4/LZ4BlockOutputStream.java#L37