RestClusterGetSettingsAction.java

/*
 * Licensed to ElasticSearch and Shay Banon 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.settings;

import org.elasticsearch.rest.XContentRestResponse;
import org.elasticsearch.rest.XContentThrowableRestResponse;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.cluster.state.ClusterStateRequest;
import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
import org.elasticsearch.client.ClusterAdminClient;
import org.elasticsearch.client.AdminRequests;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.*;
import org.elasticsearch.rest.action.support.RestXContentBuilder;

import java.io.IOException;
import java.util.Map;

/**
 */
public class RestClusterGetSettingsAction extends BaseRestHandler<ClusterAdminClient> {

    @Inject
    public RestClusterGetSettingsAction(Settings settings, ClusterAdminClient client, RestController controller) {
        super(settings, client);
        controller.registerHandler(RestRequest.Method.GET, "/_cluster/settings", this);
    }

    @Override
    public void handleRequest(final RestRequest request, final RestChannel channel) {
        ClusterStateRequest clusterStateRequest = AdminRequests.clusterStateRequest()
                .listenerThreaded(false)
                .filterRoutingTable(true)
                .filterNodes(true);
        client.state(clusterStateRequest, new ActionListener<ClusterStateResponse>() {
            @Override
            public void onResponse(ClusterStateResponse response) {
                try {
                    XContentBuilder builder = RestXContentBuilder.restContentBuilder(request);
                    builder.startObject();

                    builder.startObject("persistent");
                    for (Map.Entry<String, String> entry : response.state().metaData().persistentSettings().getAsMap().entrySet()) {
                        builder.field(entry.getKey(), entry.getValue());
                    }
                    builder.endObject();

                    builder.startObject("transient");
                    for (Map.Entry<String, String> entry : response.state().metaData().transientSettings().getAsMap().entrySet()) {
                        builder.field(entry.getKey(), entry.getValue());
                    }
                    builder.endObject();

                    builder.endObject();

                    channel.sendResponse(new XContentRestResponse(request, RestStatus.OK, builder));
                } catch (Exception e) {
                    onFailure(e);
                }
            }

            @Override
            public void onFailure(Throwable e) {
                try {
                    channel.sendResponse(new XContentThrowableRestResponse(request, e));
                } catch (IOException e1) {
                    logger.error("Failed to send failure response", e1);
                }
            }
        });
    }
}