org.sonar.server.es.EsUtils Maven / Gradle / Ivy
/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.server.es;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.function.Function;
import java.util.regex.Pattern;
import javax.annotation.CheckForNull;
import javax.annotation.Nullable;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchScrollRequestBuilder;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.sort.SortOrder;
import org.joda.time.format.ISODateTimeFormat;
import org.sonar.core.util.stream.MoreCollectors;
public class EsUtils {
public static final int SCROLL_TIME_IN_MINUTES = 3;
/**
* See https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-regexp-query.html
*/
private static final Pattern SPECIAL_REGEX_CHARS = Pattern.compile("[#@&~<>\"{}()\\[\\].+*?^$\\\\|]");
private EsUtils() {
// only static methods
}
public static List convertToDocs(SearchHits hits, Function, D> converter) {
List docs = new ArrayList<>();
for (SearchHit hit : hits.getHits()) {
docs.add(converter.apply(hit.getSource()));
}
return docs;
}
public static Map termsToMap(Terms terms) {
LinkedHashMap map = new LinkedHashMap<>();
List buckets = terms.getBuckets();
for (Terms.Bucket bucket : buckets) {
map.put(bucket.getKeyAsString(), bucket.getDocCount());
}
return map;
}
public static List termsKeys(Terms terms) {
return terms.getBuckets().stream()
.map(Terms.Bucket::getKeyAsString)
.collect(MoreCollectors.toList(terms.getBuckets().size()));
}
@CheckForNull
public static Date parseDateTime(@Nullable String s) {
if (s == null) {
return null;
}
return ISODateTimeFormat.dateTime().parseDateTime(s).toDate();
}
@CheckForNull
public static String formatDateTime(@Nullable Date date) {
if (date != null) {
return ISODateTimeFormat.dateTime().print(date.getTime());
}
return null;
}
/**
* Optimize scolling, by specifying document sorting.
* See https://www.elastic.co/guide/en/elasticsearch/reference/2.4/search-request-scroll.html#search-request-scroll
*/
public static void optimizeScrollRequest(SearchRequestBuilder esSearch) {
esSearch.addSort("_doc", SortOrder.ASC);
}
/**
* Escapes regexp special characters so that text can be forwarded from end-user input
* to Elasticsearch regexp query (for instance attributes "include" and "exclude" of
* term aggregations.
*/
public static String escapeSpecialRegexChars(String str) {
return SPECIAL_REGEX_CHARS.matcher(str).replaceAll("\\\\$0");
}
public static Iterator scrollIds(EsClient esClient, SearchResponse scrollResponse, Function idConverter) {
return new IdScrollIterator<>(esClient, scrollResponse, idConverter);
}
private static class IdScrollIterator implements Iterator {
private final EsClient esClient;
private final String scrollId;
private final Function idConverter;
private final Queue hits = new ArrayDeque<>();
private IdScrollIterator(EsClient esClient, SearchResponse scrollResponse, Function idConverter) {
this.esClient = esClient;
this.scrollId = scrollResponse.getScrollId();
this.idConverter = idConverter;
Collections.addAll(hits, scrollResponse.getHits().getHits());
}
@Override
public boolean hasNext() {
if (hits.isEmpty()) {
SearchScrollRequestBuilder esRequest = esClient.prepareSearchScroll(scrollId)
.setScroll(TimeValue.timeValueMinutes(SCROLL_TIME_IN_MINUTES));
Collections.addAll(hits, esRequest.get().getHits().getHits());
}
return !hits.isEmpty();
}
@Override
public I next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return idConverter.apply(hits.poll().getId());
}
@Override
public void remove() {
throw new UnsupportedOperationException("Cannot remove item when scrolling");
}
}
}