org.elasticsearch.rest.action.admin.indices.alias.head.RestIndicesHeadAliasesAction Maven / Gradle / Ivy

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/*
 * 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.indices.alias.head;

import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.indices.alias.exists.IndicesExistsAliasesResponse;
import org.elasticsearch.action.admin.indices.alias.get.IndicesGetAliasesRequest;
import org.elasticsearch.action.support.IgnoreIndices;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.rest.*;
import org.elasticsearch.rest.action.support.RestActions;

import static org.elasticsearch.rest.RestRequest.Method.HEAD;
import static org.elasticsearch.rest.RestStatus.NOT_FOUND;
import static org.elasticsearch.rest.RestStatus.OK;

/**
 */
public class RestIndicesHeadAliasesAction extends BaseRestHandler {

    @Inject
    public RestIndicesHeadAliasesAction(Settings settings, Client client, RestController controller) {
        super(settings, client);
        controller.registerHandler(HEAD, "/_alias/{name}", this);
        controller.registerHandler(HEAD, "/{index}/_alias/{name}", this);
    }

    @Override
    public void handleRequest(final RestRequest request, final RestChannel channel) {
        String[] aliases = request.paramAsStringArray("name", Strings.EMPTY_ARRAY);
        final String[] indices = RestActions.splitIndices(request.param("index"));
        IndicesGetAliasesRequest getAliasesRequest = new IndicesGetAliasesRequest(aliases);
        getAliasesRequest.indices(indices);

        if (request.hasParam("ignore_indices")) {
            getAliasesRequest.ignoreIndices(IgnoreIndices.fromString(request.param("ignore_indices")));
        }

        client.admin().indices().existsAliases(getAliasesRequest, new ActionListener() {

            @Override
            public void onResponse(IndicesExistsAliasesResponse response) {
                try {
                    if (response.isExists()) {
                        channel.sendResponse(new StringRestResponse(OK));
                    } else {
                        channel.sendResponse(new StringRestResponse(NOT_FOUND));
                    }
                } catch (Throwable e) {
                    onFailure(e);
                }
            }

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