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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.cluster;
import org.elasticsearch.action.admin.cluster.reroute.ClusterRerouteRequest;
import org.elasticsearch.action.admin.cluster.reroute.ClusterRerouteResponse;
import org.elasticsearch.client.Requests;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.routing.allocation.command.AllocationCommandRegistry;
import org.elasticsearch.cluster.routing.allocation.command.AllocationCommands;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParseFieldMatcher;
import org.elasticsearch.common.ParseFieldMatcherSupplier;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.settings.SettingsFilter;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.ObjectParser.ValueType;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.AcknowledgedRestListener;
import java.io.IOException;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Set;
/**
*/
public class RestClusterRerouteAction extends BaseRestHandler {
private static final ObjectParser PARSER = new ObjectParser<>("cluster_reroute");
static {
PARSER.declareField((p, v, c) -> v.commands(AllocationCommands.fromXContent(p, c.getParseFieldMatcher(), c.registry)),
new ParseField("commands"), ValueType.OBJECT_ARRAY);
PARSER.declareBoolean(ClusterRerouteRequest::dryRun, new ParseField("dry_run"));
}
private static final String DEFAULT_METRICS = Strings
.arrayToCommaDelimitedString(EnumSet.complementOf(EnumSet.of(ClusterState.Metric.METADATA)).toArray());
private final SettingsFilter settingsFilter;
private final AllocationCommandRegistry registry;
@Inject
public RestClusterRerouteAction(Settings settings, RestController controller, SettingsFilter settingsFilter,
AllocationCommandRegistry registry) {
super(settings);
this.settingsFilter = settingsFilter;
this.registry = registry;
controller.registerHandler(RestRequest.Method.POST, "/_cluster/reroute", this);
}
@Override
public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
ClusterRerouteRequest clusterRerouteRequest = createRequest(request, registry, parseFieldMatcher);
// by default, return everything but metadata
final String metric = request.param("metric");
if (metric == null) {
request.params().put("metric", DEFAULT_METRICS);
}
return channel ->
client.admin().cluster().reroute(clusterRerouteRequest, new AcknowledgedRestListener(channel) {
@Override
protected void addCustomFields(XContentBuilder builder, ClusterRerouteResponse response) throws IOException {
builder.startObject("state");
settingsFilter.addFilterSettingParams(request);
response.getState().toXContent(builder, request);
builder.endObject();
if (clusterRerouteRequest.explain()) {
assert response.getExplanations() != null;
response.getExplanations().toXContent(builder, ToXContent.EMPTY_PARAMS);
}
}
});
}
private static final Set RESPONSE_PARAMS;
static {
final Set responseParams = new HashSet<>();
responseParams.add("metric");
responseParams.addAll(Settings.FORMAT_PARAMS);
RESPONSE_PARAMS = Collections.unmodifiableSet(responseParams);
}
@Override
protected Set responseParams() {
return RESPONSE_PARAMS;
}
public static ClusterRerouteRequest createRequest(RestRequest request, AllocationCommandRegistry registry,
ParseFieldMatcher parseFieldMatcher) throws IOException {
ClusterRerouteRequest clusterRerouteRequest = Requests.clusterRerouteRequest();
clusterRerouteRequest.dryRun(request.paramAsBoolean("dry_run", clusterRerouteRequest.dryRun()));
clusterRerouteRequest.explain(request.paramAsBoolean("explain", clusterRerouteRequest.explain()));
clusterRerouteRequest.timeout(request.paramAsTime("timeout", clusterRerouteRequest.timeout()));
clusterRerouteRequest.setRetryFailed(request.paramAsBoolean("retry_failed", clusterRerouteRequest.isRetryFailed()));
clusterRerouteRequest.masterNodeTimeout(request.paramAsTime("master_timeout", clusterRerouteRequest.masterNodeTimeout()));
if (request.hasContent()) {
try (XContentParser parser = XContentHelper.createParser(request.content())) {
PARSER.parse(parser, clusterRerouteRequest, new ParseContext(registry, parseFieldMatcher));
}
}
return clusterRerouteRequest;
}
private static class ParseContext implements ParseFieldMatcherSupplier {
private final AllocationCommandRegistry registry;
private final ParseFieldMatcher parseFieldMatcher;
private ParseContext(AllocationCommandRegistry registry, ParseFieldMatcher parseFieldMatcher) {
this.registry = registry;
this.parseFieldMatcher = parseFieldMatcher;
}
@Override
public ParseFieldMatcher getParseFieldMatcher() {
return parseFieldMatcher;
}
}
}