RestClusterHealthAction.java example

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 * the Apache License, Version 2.0 (the "License"); you may
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 * 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,
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package org.elasticsearch.rest.action.admin.cluster;

import org.elasticsearch.action.admin.cluster.health.ClusterHealthRequest;
import org.elasticsearch.action.support.ActiveShardCount;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.health.ClusterHealthStatus;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.action.RestStatusToXContentListener;

import java.io.IOException;
import java.util.Collections;
import java.util.Locale;
import java.util.Set;

import static org.elasticsearch.client.Requests.clusterHealthRequest;

public class RestClusterHealthAction extends BaseRestHandler {
    public RestClusterHealthAction(Settings settings, RestController controller) {
        super(settings);

        controller.registerHandler(RestRequest.Method.GET, "/_cluster/health", this);
        controller.registerHandler(RestRequest.Method.GET, "/_cluster/health/{index}", this);
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        ClusterHealthRequest clusterHealthRequest = clusterHealthRequest(Strings.splitStringByCommaToArray(request.param("index")));
        clusterHealthRequest.local(request.paramAsBoolean("local", clusterHealthRequest.local()));
        clusterHealthRequest.masterNodeTimeout(request.paramAsTime("master_timeout", clusterHealthRequest.masterNodeTimeout()));
        clusterHealthRequest.timeout(request.paramAsTime("timeout", clusterHealthRequest.timeout()));
        String waitForStatus = request.param("wait_for_status");
        if (waitForStatus != null) {
            clusterHealthRequest.waitForStatus(ClusterHealthStatus.valueOf(waitForStatus.toUpperCase(Locale.ROOT)));
        }
        clusterHealthRequest.waitForNoRelocatingShards(
                request.paramAsBoolean("wait_for_no_relocating_shards", clusterHealthRequest.waitForNoRelocatingShards()));
        if (request.hasParam("wait_for_relocating_shards")) {
            // wait_for_relocating_shards has been removed in favor of wait_for_no_relocating_shards
            throw new IllegalArgumentException("wait_for_relocating_shards has been removed, " +
                                               "use wait_for_no_relocating_shards [true/false] instead");
        }
        String waitForActiveShards = request.param("wait_for_active_shards");
        if (waitForActiveShards != null) {
            clusterHealthRequest.waitForActiveShards(ActiveShardCount.parseString(waitForActiveShards));
        }
        clusterHealthRequest.waitForNodes(request.param("wait_for_nodes", clusterHealthRequest.waitForNodes()));
        if (request.param("wait_for_events") != null) {
            clusterHealthRequest.waitForEvents(Priority.valueOf(request.param("wait_for_events").toUpperCase(Locale.ROOT)));
        }
        return channel -> client.admin().cluster().health(clusterHealthRequest, new RestStatusToXContentListener<>(channel));
    }

    private static final Set<String> RESPONSE_PARAMS = Collections.singleton("level");

    @Override
    protected Set<String> responseParams() {
        return RESPONSE_PARAMS;
    }

    @Override
    public boolean canTripCircuitBreaker() {
        return false;
    }

}