/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.hadoop.yarn.server.resourcemanager.nodelabels;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.util.Map;
import java.util.Set;

import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.NodeLabel;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.nodelabels.NodeLabelTestBase;
import org.apache.hadoop.yarn.server.api.protocolrecords.RegisterNodeManagerRequest;
import org.apache.hadoop.yarn.server.resourcemanager.MockRM;
import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
import org.apache.hadoop.yarn.server.resourcemanager.ResourceTrackerService;
import org.apache.hadoop.yarn.server.utils.BuilderUtils;
import org.apache.hadoop.yarn.util.Records;
import org.apache.hadoop.yarn.util.YarnVersionInfo;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;

public class TestRMDelegatedNodeLabelsUpdater extends NodeLabelTestBase {
  private YarnConfiguration conf;
  private static Map<NodeId, Set<NodeLabel>> nodeLabelsMap = Maps.newHashMap();

  @Before
  public void setup() {
    conf = new YarnConfiguration();
    conf.setBoolean(YarnConfiguration.NODE_LABELS_ENABLED, true);
    conf.set(YarnConfiguration.NODELABEL_CONFIGURATION_TYPE,
        YarnConfiguration.DELEGATED_CENTALIZED_NODELABEL_CONFIGURATION_TYPE);
    conf.setClass(YarnConfiguration.RM_NODE_LABELS_PROVIDER_CONFIG,
        DummyRMNodeLabelsMappingProvider.class,
        RMNodeLabelsMappingProvider.class);
  }

  @Test
  public void testRMNodeLabelsMappingProviderConfiguration() {
    conf.unset(YarnConfiguration.RM_NODE_LABELS_PROVIDER_CONFIG);
    try {
      MockRM rm = new MockRM(conf);
      rm.init(conf);
      rm.start();
      Assert.fail("Expected an exception");
    } catch (Exception e) {
      // expected an exception
      Assert.assertTrue(e.getMessage().contains(
          "RMNodeLabelsMappingProvider should be configured"));
    }
  }

  @Test
  public void testWithNodeLabelUpdateEnabled() throws Exception {
    conf.setLong(YarnConfiguration.RM_NODE_LABELS_PROVIDER_FETCH_INTERVAL_MS,
        1000);
    MockRM rm = new MockRM(conf);
    rm.init(conf);
    rm.getRMContext().getRMDelegatedNodeLabelsUpdater().nodeLabelsUpdateInterval
        = 3 * 1000;
    rm.start();

    RMNodeLabelsManager mgr = rm.getRMContext().getNodeLabelManager();
    mgr.addToCluserNodeLabelsWithDefaultExclusivity(ImmutableSet.of("x", "y"));

    NodeId nodeId = toNodeId("h1:1234");
    assertEquals(0, mgr.getLabelsOnNode(nodeId).size());
    updateNodeLabels(nodeId, "x");
    registerNode(rm, nodeId);
    Thread.sleep(4000);
    assertCollectionEquals(ImmutableSet.of("x"), mgr.getLabelsOnNode(nodeId));

    // Ensure that node labels are updated if NodeLabelsProvider
    // gives different labels
    updateNodeLabels(nodeId, "y");
    Thread.sleep(4000);
    assertCollectionEquals(ImmutableSet.of("y"), mgr.getLabelsOnNode(nodeId));

    rm.stop();
  }

  @Test
  public void testWithNodeLabelUpdateDisabled() throws Exception {
    conf.setLong(YarnConfiguration.RM_NODE_LABELS_PROVIDER_FETCH_INTERVAL_MS,
        RMDelegatedNodeLabelsUpdater.DISABLE_DELEGATED_NODE_LABELS_UPDATE);
    MockRM rm = new MockRM(conf);
    rm.init(conf);
    rm.getRMContext().getRMDelegatedNodeLabelsUpdater().nodeLabelsUpdateInterval
        = 3 * 1000;
    rm.start();

    RMNodeLabelsManager mgr = rm.getRMContext().getNodeLabelManager();
    mgr.addToCluserNodeLabelsWithDefaultExclusivity(ImmutableSet.of("x"));

    NodeId nodeId = toNodeId("h1:1234");
    updateNodeLabels(nodeId, "x");
    registerNode(rm, nodeId);
    Thread.sleep(4000);
    // Ensure that even though timer is not run, node labels are fetched
    // when node is registered
    assertCollectionEquals(ImmutableSet.of("x"), mgr.getLabelsOnNode(nodeId));

    rm.stop();
  }

  private void registerNode(ResourceManager rm, NodeId nodeId)
      throws YarnException, IOException {
    ResourceTrackerService resourceTrackerService =
        rm.getResourceTrackerService();
    RegisterNodeManagerRequest req =
        Records.newRecord(RegisterNodeManagerRequest.class);
    Resource capability = BuilderUtils.newResource(1024, 1);
    req.setResource(capability);
    req.setNodeId(nodeId);
    req.setHttpPort(1234);
    req.setNMVersion(YarnVersionInfo.getVersion());
    resourceTrackerService.registerNodeManager(req);
  }

  private void updateNodeLabels(NodeId nodeId, String... nodeLabelsStr) {
    nodeLabelsMap.put(nodeId, toNodeLabelSet(nodeLabelsStr));
  }

  public static class DummyRMNodeLabelsMappingProvider extends
      RMNodeLabelsMappingProvider {
    public DummyRMNodeLabelsMappingProvider() {
      super("DummyRMNodeLabelsMappingProvider");
    }

    @Override
    public Map<NodeId, Set<NodeLabel>> getNodeLabels(Set<NodeId> nodes) {
      Map<NodeId, Set<NodeLabel>> nodeLabels = Maps.newHashMap();
      for(NodeId node : nodes) {
        nodeLabels.put(node, nodeLabelsMap.get(node));
      }
      return nodeLabels;
    }
  }
}
