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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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 org.elasticsearch.rest.action.search;
import org.elasticsearch.action.search.ClearScrollRequest;
import org.elasticsearch.action.search.ClearScrollResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.RestActions;
import org.elasticsearch.rest.action.RestStatusToXContentListener;
import java.io.IOException;
import java.util.Arrays;
import static org.elasticsearch.rest.RestRequest.Method.DELETE;
public class RestClearScrollAction extends BaseRestHandler {
@Inject
public RestClearScrollAction(Settings settings, RestController controller) {
super(settings);
controller.registerHandler(DELETE, "/_search/scroll", this);
controller.registerHandler(DELETE, "/_search/scroll/{scroll_id}", this);
}
@Override
public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
String scrollIds = request.param("scroll_id");
ClearScrollRequest clearRequest = new ClearScrollRequest();
clearRequest.setScrollIds(Arrays.asList(splitScrollIds(scrollIds)));
if (RestActions.hasBodyContent(request)) {
XContentType type = RestActions.guessBodyContentType(request);
if (type == null) {
scrollIds = RestActions.getRestContent(request).utf8ToString();
clearRequest.setScrollIds(Arrays.asList(splitScrollIds(scrollIds)));
} else {
// NOTE: if rest request with xcontent body has request parameters, these parameters does not override xcontent value
clearRequest.setScrollIds(null);
buildFromContent(RestActions.getRestContent(request), clearRequest);
}
}
return channel -> client.clearScroll(clearRequest, new RestStatusToXContentListener(channel));
}
public static String[] splitScrollIds(String scrollIds) {
if (scrollIds == null) {
return Strings.EMPTY_ARRAY;
}
return Strings.splitStringByCommaToArray(scrollIds);
}
public static void buildFromContent(BytesReference content, ClearScrollRequest clearScrollRequest) {
try (XContentParser parser = XContentHelper.createParser(content)) {
if (parser.nextToken() != XContentParser.Token.START_OBJECT) {
throw new IllegalArgumentException("Malformed content, must start with an object");
} else {
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if ("scroll_id".equals(currentFieldName) && token == XContentParser.Token.START_ARRAY) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
if (token.isValue() == false) {
throw new IllegalArgumentException("scroll_id array element should only contain scroll_id");
}
clearScrollRequest.addScrollId(parser.text());
}
} else {
throw new IllegalArgumentException("Unknown parameter [" + currentFieldName
+ "] in request body or parameter is of the wrong type[" + token + "] ");
}
}
}
} catch (IOException e) {
throw new IllegalArgumentException("Failed to parse request body", e);
}
}
}