org.elasticsearch.rest.action.admin.cluster.RestClusterAllocationExplainAction Maven / Gradle / Ivy
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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.admin.cluster;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.admin.cluster.allocation.ClusterAllocationExplainRequest;
import org.elasticsearch.action.admin.cluster.allocation.ClusterAllocationExplainResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.BytesRestResponse;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.rest.action.RestActions;
import org.elasticsearch.rest.action.RestBuilderListener;
import java.io.IOException;
/**
* Class handling cluster allocation explanation at the REST level
*/
public class RestClusterAllocationExplainAction extends BaseRestHandler {
@Inject
public RestClusterAllocationExplainAction(Settings settings, RestController controller) {
super(settings);
controller.registerHandler(RestRequest.Method.GET, "/_cluster/allocation/explain", this);
controller.registerHandler(RestRequest.Method.POST, "/_cluster/allocation/explain", this);
}
@Override
public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
ClusterAllocationExplainRequest req;
if (RestActions.hasBodyContent(request) == false) {
// Empty request signals "explain the first unassigned shard you find"
req = new ClusterAllocationExplainRequest();
} else {
BytesReference content = RestActions.getRestContent(request);
try (XContentParser parser = XContentFactory.xContent(content).createParser(content)) {
req = ClusterAllocationExplainRequest.parse(parser);
} catch (IOException e) {
logger.debug("failed to parse allocation explain request", e);
return channel -> channel.sendResponse(
new BytesRestResponse(ExceptionsHelper.status(e), BytesRestResponse.TEXT_CONTENT_TYPE, BytesArray.EMPTY));
}
}
try {
req.includeYesDecisions(request.paramAsBoolean("include_yes_decisions", false));
req.includeDiskInfo(request.paramAsBoolean("include_disk_info", false));
return channel ->
client.admin().cluster().allocationExplain(req, new RestBuilderListener(channel) {
@Override
public RestResponse buildResponse(ClusterAllocationExplainResponse response, XContentBuilder builder) throws Exception {
response.getExplanation().toXContent(builder, ToXContent.EMPTY_PARAMS);
return new BytesRestResponse(RestStatus.OK, builder);
}
});
} catch (Exception e) {
logger.error("failed to explain allocation", e);
return channel ->
channel.sendResponse(
new BytesRestResponse(ExceptionsHelper.status(e), BytesRestResponse.TEXT_CONTENT_TYPE, BytesArray.EMPTY));
}
}
}