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 * 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
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package org.elasticsearch.nodesinfo;

import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.test.ESIntegTestCase;
import org.elasticsearch.test.ESIntegTestCase.ClusterScope;
import org.elasticsearch.test.ESIntegTestCase.Scope;

import java.util.List;

import static org.elasticsearch.client.Requests.nodesInfoRequest;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.notNullValue;

@ClusterScope(scope= Scope.TEST, numDataNodes = 0)
public class SimpleNodesInfoIT extends ESIntegTestCase {

    public void testNodesInfos() throws Exception {
        List<String> nodesIds = internalCluster().startNodes(2);
        final String node_1 = nodesIds.get(0);
        final String node_2 = nodesIds.get(1);

        ClusterHealthResponse clusterHealth = client().admin().cluster().prepareHealth().setWaitForGreenStatus().setWaitForNodes("2").get();
        logger.info("--> done cluster_health, status {}", clusterHealth.getStatus());

        String server1NodeId = internalCluster().getInstance(ClusterService.class, node_1).state().nodes().getLocalNodeId();
        String server2NodeId = internalCluster().getInstance(ClusterService.class, node_2).state().nodes().getLocalNodeId();
        logger.info("--> started nodes: {} and {}", server1NodeId, server2NodeId);

        NodesInfoResponse response = client().admin().cluster().prepareNodesInfo().execute().actionGet();
        assertThat(response.getNodes().size(), is(2));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());
        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());

        response = client().admin().cluster().nodesInfo(nodesInfoRequest()).actionGet();
        assertThat(response.getNodes().size(), is(2));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());
        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());

        response = client().admin().cluster().nodesInfo(nodesInfoRequest(server1NodeId)).actionGet();
        assertThat(response.getNodes().size(), is(1));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());

        response = client().admin().cluster().nodesInfo(nodesInfoRequest(server1NodeId)).actionGet();
        assertThat(response.getNodes().size(), is(1));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());

        response = client().admin().cluster().nodesInfo(nodesInfoRequest(server2NodeId)).actionGet();
        assertThat(response.getNodes().size(), is(1));
        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());

        response = client().admin().cluster().nodesInfo(nodesInfoRequest(server2NodeId)).actionGet();
        assertThat(response.getNodes().size(), is(1));
        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());
    }

    public void testNodesInfosTotalIndexingBuffer() throws Exception {
        List<String> nodesIds = internalCluster().startNodes(2);
        final String node_1 = nodesIds.get(0);
        final String node_2 = nodesIds.get(1);

        ClusterHealthResponse clusterHealth = client().admin().cluster().prepareHealth().setWaitForGreenStatus().setWaitForNodes("2").get();
        logger.info("--> done cluster_health, status {}", clusterHealth.getStatus());

        String server1NodeId = internalCluster().getInstance(ClusterService.class, node_1).state().nodes().getLocalNodeId();
        String server2NodeId = internalCluster().getInstance(ClusterService.class, node_2).state().nodes().getLocalNodeId();
        logger.info("--> started nodes: {} and {}", server1NodeId, server2NodeId);

        NodesInfoResponse response = client().admin().cluster().prepareNodesInfo().execute().actionGet();
        assertThat(response.getNodes().size(), is(2));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());
        assertNotNull(response.getNodesMap().get(server1NodeId).getTotalIndexingBuffer());
        assertThat(response.getNodesMap().get(server1NodeId).getTotalIndexingBuffer().getBytes(), greaterThan(0L));

        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());
        assertNotNull(response.getNodesMap().get(server2NodeId).getTotalIndexingBuffer());
        assertThat(response.getNodesMap().get(server2NodeId).getTotalIndexingBuffer().getBytes(), greaterThan(0L));

        // again, using only the indices flag
        response = client().admin().cluster().prepareNodesInfo().clear().setIndices(true).execute().actionGet();
        assertThat(response.getNodes().size(), is(2));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());
        assertNotNull(response.getNodesMap().get(server1NodeId).getTotalIndexingBuffer());
        assertThat(response.getNodesMap().get(server1NodeId).getTotalIndexingBuffer().getBytes(), greaterThan(0L));

        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());
        assertNotNull(response.getNodesMap().get(server2NodeId).getTotalIndexingBuffer());
        assertThat(response.getNodesMap().get(server2NodeId).getTotalIndexingBuffer().getBytes(), greaterThan(0L));
    }

    public void testAllocatedProcessors() throws Exception {
        List<String> nodesIds = internalCluster().startNodes(
                        Settings.builder().put(EsExecutors.PROCESSORS_SETTING.getKey(), 3).build(),
                        Settings.builder().put(EsExecutors.PROCESSORS_SETTING.getKey(), 6).build()
                );

        final String node_1 = nodesIds.get(0);
        final String node_2 = nodesIds.get(1);

        ClusterHealthResponse clusterHealth = client().admin().cluster().prepareHealth().setWaitForGreenStatus().setWaitForNodes("2").get();
        logger.info("--> done cluster_health, status {}", clusterHealth.getStatus());

        String server1NodeId = internalCluster().getInstance(ClusterService.class, node_1).state().nodes().getLocalNodeId();
        String server2NodeId = internalCluster().getInstance(ClusterService.class, node_2).state().nodes().getLocalNodeId();
        logger.info("--> started nodes: {} and {}", server1NodeId, server2NodeId);

        NodesInfoResponse response = client().admin().cluster().prepareNodesInfo().execute().actionGet();

        assertThat(response.getNodes().size(), is(2));
        assertThat(response.getNodesMap().get(server1NodeId), notNullValue());
        assertThat(response.getNodesMap().get(server2NodeId), notNullValue());

        assertThat(response.getNodesMap().get(server1NodeId).getOs().getAvailableProcessors(),
                equalTo(Runtime.getRuntime().availableProcessors()));
        assertThat(response.getNodesMap().get(server2NodeId).getOs().getAvailableProcessors(),
                equalTo(Runtime.getRuntime().availableProcessors()));

        assertThat(response.getNodesMap().get(server1NodeId).getOs().getAllocatedProcessors(), equalTo(3));
        assertThat(response.getNodesMap().get(server2NodeId).getOs().getAllocatedProcessors(), equalTo(6));
    }
}
