package com.digitalpebble.behemoth.io.warc;
/**
* 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.
*/
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.nutch.metadata.HttpHeaders;
import org.apache.nutch.protocol.ProtocolException;
import com.digitalpebble.behemoth.BehemothConfiguration;
import com.digitalpebble.behemoth.BehemothDocument;
/**
* Converts a WARC archive into a Behemoth datastructure for further processing
*/
public class WARCConverterJob extends Configured implements Tool,
Mapper<LongWritable, WritableWarcRecord, Text, BehemothDocument> {
public static final Logger LOG = LoggerFactory
.getLogger(WARCConverterJob.class);
public WARCConverterJob() {
this(null);
}
public WARCConverterJob(Configuration conf) {
super(conf);
}
public void configure(JobConf job) {
setConf(job);
}
public void close() {
}
private Text newKey = new Text();
public void map(LongWritable key, WritableWarcRecord record,
OutputCollector<Text, BehemothDocument> output, Reporter reporter)
throws IOException {
BehemothDocument behemothDocument = new BehemothDocument();
if (record.getRecord().getHeaderRecordType().equals("response") == false)
return;
byte[] binarycontent = record.getRecord().getContent();
String uri = record.getRecord()
.getHeaderMetadataItem("WARC-Target-URI");
// application/http;msgtype=response
// but always null?
// String WARCContentType =
// record.getRecord().getHeaderMetadataItem("Content-Type");
HttpResponse response;
try {
response = new HttpResponse(binarycontent);
} catch (ProtocolException e) {
return;
}
behemothDocument.setUrl(uri);
newKey.set(uri);
String contentType = response.getHeader(HttpHeaders.CONTENT_TYPE);
behemothDocument.setContentType(contentType);
behemothDocument.setContent(response.getContent());
output.collect(newKey, behemothDocument);
}
public void convert(Path warcpath, Path output) throws IOException {
JobConf job = new JobConf(getConf());
job.setJobName("Convert WARC " + warcpath);
job.setJarByClass(this.getClass());
FileInputFormat.addInputPath(job, warcpath);
job.setInputFormat(WarcFileInputFormat.class);
job.setMapperClass(WARCConverterJob.class);
// no reducers
job.setNumReduceTasks(0);
FileOutputFormat.setOutputPath(job, output);
job.setOutputFormat(SequenceFileOutputFormat.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(BehemothDocument.class);
JobClient.runJob(job);
if (LOG.isInfoEnabled()) {
LOG.info("Conversion: done");
}
}
public static void main(String[] args) throws Exception {
int res = ToolRunner.run(BehemothConfiguration.create(),
new WARCConverterJob(), args);
System.exit(res);
}
public int run(String[] args) throws Exception {
String usage = "Usage: WARCConverterJob archive output";
if (args.length == 0) {
System.err.println(usage);
System.exit(-1);
}
Path segment = new Path(args[0]);
Path output = new Path(args[1]);
convert(segment, output);
return 0;
}
}