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Metron 257 Enable pcap result pagination from the Pcap CLI #256
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139 changes: 139 additions & 0 deletions
139
...orm/metron-common/src/main/java/org/apache/metron/common/hadoop/SequenceFileIterable.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF 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. | ||
| */ | ||
|
|
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| package org.apache.metron.common.hadoop; | ||
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| import com.google.common.collect.Iterators; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.fs.FileSystem; | ||
| import org.apache.hadoop.fs.Path; | ||
| import org.apache.hadoop.io.BytesWritable; | ||
| import org.apache.hadoop.io.LongWritable; | ||
| import org.apache.hadoop.io.SequenceFile; | ||
| import org.apache.log4j.Logger; | ||
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|
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| import java.io.IOException; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.NoSuchElementException; | ||
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| import static java.lang.String.format; | ||
|
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| public class SequenceFileIterable implements Iterable<byte[]> { | ||
| private static final Logger LOGGER = Logger.getLogger(SequenceFileIterable.class); | ||
| private List<Path> files; | ||
| private Configuration config; | ||
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|
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| public SequenceFileIterable(List<Path> files, Configuration config) { | ||
| this.files = files; | ||
| this.config = config; | ||
| } | ||
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| @Override | ||
| public Iterator<byte[]> iterator() { | ||
| return Iterators.concat(getIterators(files, config)); | ||
| } | ||
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| private Iterator<byte[]>[] getIterators(List<Path> files, Configuration config) { | ||
| return files.stream().map(f -> new SequenceFileIterator(f, config)).toArray(Iterator[]::new); | ||
| } | ||
|
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| /** | ||
| * Cleans up all files read by this Iterable | ||
| * | ||
| * @return true if success, false if any files were not deleted | ||
| * @throws IOException | ||
| */ | ||
| public boolean cleanup() throws IOException { | ||
| FileSystem fileSystem = FileSystem.get(config); | ||
| boolean success = true; | ||
| for (Path file : files) { | ||
| success &= fileSystem.delete(file, false); | ||
| } | ||
| return success; | ||
| } | ||
|
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| private static class SequenceFileIterator implements Iterator<byte[]> { | ||
| private Path path; | ||
| private Configuration config; | ||
| private SequenceFile.Reader reader; | ||
| private LongWritable key = new LongWritable(); | ||
| private BytesWritable value = new BytesWritable(); | ||
| private byte[] next; | ||
| private boolean finished = false; | ||
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| public SequenceFileIterator(Path path, Configuration config) { | ||
| this.path = path; | ||
| this.config = config; | ||
| } | ||
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| @Override | ||
| public boolean hasNext() { | ||
| if (!finished && null == reader) { | ||
| try { | ||
| reader = new SequenceFile.Reader(config, SequenceFile.Reader.file(path)); | ||
| LOGGER.debug("Writing file: " + path.toString()); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Failed to get reader", e); | ||
| } | ||
| } else { | ||
| LOGGER.debug(format("finished=%s, reader=%s, next=%s", finished, reader, next)); | ||
| } | ||
| try { | ||
| //ensure hasnext is idempotent | ||
| if (!finished) { | ||
| if (null == next && reader.next(key, value)) { | ||
| next = value.copyBytes(); | ||
| } else if (null == next) { | ||
| close(); | ||
| } | ||
| } | ||
| } catch (IOException e) { | ||
| close(); | ||
| throw new RuntimeException("Failed to get next record", e); | ||
| } | ||
| return (null != next); | ||
| } | ||
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| private void close() { | ||
| LOGGER.debug("Closing file: " + path.toString()); | ||
| finished = true; | ||
| try { | ||
| if (reader != null) { | ||
| reader.close(); | ||
| reader = null; | ||
| } | ||
| } catch (IOException e) { | ||
| // ah well, we tried... | ||
| LOGGER.warn("Error closing file", e); | ||
| } | ||
| } | ||
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| @Override | ||
| public byte[] next() { | ||
| byte[] ret = null; | ||
| if (hasNext()) { | ||
| ret = next; | ||
| next = null; //don't want same record more than once | ||
| } else { | ||
| throw new NoSuchElementException("No more records"); | ||
| } | ||
| return ret; | ||
| } | ||
| } | ||
| } | ||
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Can we log this Exception? I'm not sure we can do anything about it, but it would be nice to be able to ensure we can see it.