/*
* 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.indices;
import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesRequest;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.metadata.AliasMetaData;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
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.RestBuilderListener;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.HEAD;
import static org.elasticsearch.rest.RestStatus.OK;
/**
* The REST handler for get alias and head alias APIs.
*/
public class RestGetAliasesAction extends BaseRestHandler {
public RestGetAliasesAction(final Settings settings, final RestController controller) {
super(settings);
controller.registerHandler(GET, "/_alias/{name}", this);
controller.registerHandler(HEAD, "/_alias/{name}", this);
controller.registerHandler(GET, "/{index}/_alias/{name}", this);
controller.registerHandler(HEAD, "/{index}/_alias/{name}", this);
}
@Override
public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
final String[] aliases = request.paramAsStringArrayOrEmptyIfAll("name");
final GetAliasesRequest getAliasesRequest = new GetAliasesRequest(aliases);
final String[] indices = Strings.splitStringByCommaToArray(request.param("index"));
getAliasesRequest.indices(indices);
getAliasesRequest.indicesOptions(IndicesOptions.fromRequest(request, getAliasesRequest.indicesOptions()));
getAliasesRequest.local(request.paramAsBoolean("local", getAliasesRequest.local()));
return channel -> client.admin().indices().getAliases(getAliasesRequest, new RestBuilderListener<GetAliasesResponse>(channel) {
@Override
public RestResponse buildResponse(GetAliasesResponse response, XContentBuilder builder) throws Exception {
if (response.getAliases().isEmpty()) {
// empty body if indices were specified but no matching aliases exist
if (indices.length > 0) {
return new BytesRestResponse(OK, builder.startObject().endObject());
} else {
final String message = String.format(Locale.ROOT, "alias [%s] missing", toNamesString(getAliasesRequest.aliases()));
builder.startObject();
{
builder.field("error", message);
builder.field("status", RestStatus.NOT_FOUND.getStatus());
}
builder.endObject();
return new BytesRestResponse(RestStatus.NOT_FOUND, builder);
}
} else {
builder.startObject();
{
for (final ObjectObjectCursor<String, List<AliasMetaData>> entry : response.getAliases()) {
builder.startObject(entry.key);
{
builder.startObject("aliases");
{
for (final AliasMetaData alias : entry.value) {
AliasMetaData.Builder.toXContent(alias, builder, ToXContent.EMPTY_PARAMS);
}
}
builder.endObject();
}
builder.endObject();
}
}
builder.endObject();
return new BytesRestResponse(OK, builder);
}
}
});
}
private static String toNamesString(final String... names) {
if (names == null || names.length == 0) {
return "";
} else if (names.length == 1) {
return names[0];
} else {
return Arrays.stream(names).collect(Collectors.joining(","));
}
}
}