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Elasticsearch resources for StormCrawler
/**
* Licensed to DigitalPebble Ltd under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* DigitalPebble 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 com.digitalpebble.stormcrawler.elasticsearch.bolt;
import static com.digitalpebble.stormcrawler.Constants.StatusStreamName;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.digitalpebble.stormcrawler.Metadata;
import com.digitalpebble.stormcrawler.elasticsearch.ElasticSearchConnection;
import com.digitalpebble.stormcrawler.indexing.AbstractIndexerBolt;
import com.digitalpebble.stormcrawler.persistence.Status;
import com.digitalpebble.stormcrawler.util.ConfUtils;
import org.apache.storm.metric.api.MultiCountMetric;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;
/**
* Sends documents to ElasticSearch. Indexes all the fields from the tuples or a
* Map <String,Object> from a named field.
*/
@SuppressWarnings("serial")
public class IndexerBolt extends AbstractIndexerBolt {
private static final Logger LOG = LoggerFactory
.getLogger(IndexerBolt.class);
private static final String ESBoltType = "indexer";
private static final String ESIndexNameParamName = "es.indexer.index.name";
private static final String ESDocTypeParamName = "es.indexer.doc.type";
private static final String ESCreateParamName = "es.indexer.create";
private OutputCollector _collector;
private String indexName;
private String docType;
private boolean create = false;
private MultiCountMetric eventCounter;
private ElasticSearchConnection connection;
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public void prepare(Map conf, TopologyContext context,
OutputCollector collector) {
super.prepare(conf, context, collector);
_collector = collector;
indexName = ConfUtils.getString(conf, IndexerBolt.ESIndexNameParamName,
"fetcher");
docType = ConfUtils.getString(conf, IndexerBolt.ESDocTypeParamName,
"doc");
create = ConfUtils.getBoolean(conf, IndexerBolt.ESCreateParamName,
false);
try {
connection = ElasticSearchConnection
.getConnection(conf, ESBoltType);
} catch (Exception e1) {
LOG.error("Can't connect to ElasticSearch", e1);
throw new RuntimeException(e1);
}
this.eventCounter = context.registerMetric("ElasticSearchIndexer",
new MultiCountMetric(), 10);
}
@Override
public void cleanup() {
if (connection != null)
connection.close();
}
@Override
public void execute(Tuple tuple) {
String url = tuple.getStringByField("url");
// Distinguish the value used for indexing
// from the one used for the status
String normalisedurl = valueForURL(tuple);
Metadata metadata = (Metadata) tuple.getValueByField("metadata");
String text = tuple.getStringByField("text");
boolean keep = filterDocument(metadata);
if (!keep) {
eventCounter.scope("Filtered").incrBy(1);
// treat it as successfully processed even if
// we do not index it
_collector.emit(StatusStreamName, tuple, new Values(url, metadata,
Status.FETCHED));
_collector.ack(tuple);
return;
}
try {
XContentBuilder builder = jsonBuilder().startObject();
// display text of the document?
if (fieldNameForText() != null) {
builder.field(fieldNameForText(), text);
}
// send URL as field?
if (fieldNameForURL() != null) {
builder.field(fieldNameForURL(), normalisedurl);
}
// which metadata to display?
Map keyVals = filterMetadata(metadata);
Iterator iterator = keyVals.keySet().iterator();
while (iterator.hasNext()) {
String fieldName = iterator.next();
String[] values = keyVals.get(fieldName);
if (values.length == 1) {
builder.field(fieldName, values[0]);
} else if (values.length > 1) {
builder.array(fieldName, values);
}
}
builder.endObject();
String sha256hex = org.apache.commons.codec.digest.DigestUtils
.sha256Hex(normalisedurl);
IndexRequestBuilder request = connection.getClient()
.prepareIndex(indexName, docType).setSource(builder)
.setId(sha256hex);
// set create?
request.setCreate(create);
connection.getProcessor().add(request.request());
eventCounter.scope("Indexed").incrBy(1);
_collector.emit(StatusStreamName, tuple, new Values(url, metadata,
Status.FETCHED));
_collector.ack(tuple);
} catch (IOException e) {
LOG.error("Error sending log tuple to ES", e);
// do not send to status stream so that it gets replayed
_collector.fail(tuple);
}
}
}