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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.main;
import org.elasticsearch.Build;
import org.elasticsearch.Version;
import org.elasticsearch.client.Client;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.*;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.HEAD;
/**
*
*/
public class RestMainAction extends BaseRestHandler {
private final Version version;
private final ClusterName clusterName;
private final ClusterService clusterService;
@Inject
public RestMainAction(Settings settings, Version version, RestController controller, ClusterName clusterName, Client client, ClusterService clusterService) {
super(settings, controller, client);
this.version = version;
this.clusterName = clusterName;
this.clusterService = clusterService;
controller.registerHandler(GET, "/", this);
controller.registerHandler(HEAD, "/", this);
}
@Override
public void handleRequest(final RestRequest request, RestChannel channel, final Client client) throws Exception {
RestStatus status = RestStatus.OK;
ClusterState clusterState = clusterService.state();
if (clusterState.blocks().hasGlobalBlock(RestStatus.SERVICE_UNAVAILABLE)) {
status = RestStatus.SERVICE_UNAVAILABLE;
}
if (request.method() == RestRequest.Method.HEAD) {
channel.sendResponse(new BytesRestResponse(status));
return;
}
XContentBuilder builder = channel.newBuilder();
// Default to pretty printing, but allow ?pretty=false to disable
if (!request.hasParam("pretty")) {
builder.prettyPrint().lfAtEnd();
}
builder.startObject();
if (settings.get("name") != null) {
builder.field("name", settings.get("name"));
}
builder.field("cluster_name", clusterName.value());
builder.field("cluster_uuid", clusterState.metaData().clusterUUID());
builder.startObject("version")
.field("number", version.number())
.field("build_hash", Build.CURRENT.hash())
.field("build_timestamp", Build.CURRENT.timestamp())
.field("build_snapshot", version.snapshot)
.field("lucene_version", version.luceneVersion.toString())
.endObject();
builder.field("tagline", "You Know, for Search");
builder.endObject();
channel.sendResponse(new BytesRestResponse(status, builder));
}
}