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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.indices;
import com.carrotsearch.hppc.cursors.ObjectCursor;
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.collect.ImmutableOpenMap;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.set.Sets;
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.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.SortedSet;
import java.util.stream.Collectors;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.HEAD;
/*
* 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(channel) {
@Override
public RestResponse buildResponse(GetAliasesResponse response, XContentBuilder builder) throws Exception {
final ImmutableOpenMap> aliasMap = response.getAliases();
final Set aliasNames = new HashSet<>();
for (final ObjectCursor> cursor : aliasMap.values()) {
for (final AliasMetaData aliasMetaData : cursor.value) {
aliasNames.add(aliasMetaData.alias());
}
}
// first remove requested aliases that are exact matches
final SortedSet difference = Sets.sortedDifference(Arrays.stream(aliases).collect(Collectors.toSet()), aliasNames);
// now remove requested aliases that contain wildcards that are simple matches
final List matches = new ArrayList<>();
outer:
for (final String pattern : difference) {
if (pattern.contains("*")) {
for (final String aliasName : aliasNames) {
if (Regex.simpleMatch(pattern, aliasName)) {
matches.add(pattern);
continue outer;
}
}
}
}
difference.removeAll(matches);
final RestStatus status;
builder.startObject();
{
if (difference.isEmpty()) {
status = RestStatus.OK;
} else {
status = RestStatus.NOT_FOUND;
final String message;
if (difference.size() == 1) {
message = String.format(Locale.ROOT, "alias [%s] missing", toNamesString(difference.iterator().next()));
} else {
message = String.format(Locale.ROOT, "aliases [%s] missing", toNamesString(difference.toArray(new String[0])));
}
builder.field("error", message);
builder.field("status", status.getStatus());
}
for (final ObjectObjectCursor> 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(status, 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(","));
}
}
}