/**
 * 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.applications.distributedshell;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.api.records.Container;
import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerState;
import org.apache.hadoop.yarn.api.records.ContainerStatus;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.Priority;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.client.api.AMRMClient;
import org.apache.hadoop.yarn.client.api.async.AMRMClientAsync;
import org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.utils.BuilderUtils;
import org.junit.Assert;
import org.junit.Test;
import org.mockito.Matchers;
import org.mockito.Mockito;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * A bunch of tests to make sure that the container allocations
 * and releases occur correctly.
 */
public class TestDSAppMaster {

  static class TestAppMaster extends ApplicationMaster {
    private int threadsLaunched = 0;
    public List<String> yarnShellIds = new ArrayList<String>();

    @Override
    protected Thread createLaunchContainerThread(Container allocatedContainer,
        String shellId) {
      threadsLaunched++;
      launchedContainers.add(allocatedContainer.getId());
      yarnShellIds.add(shellId);
      return new Thread();
    }

    void setNumTotalContainers(int numTotalContainers) {
      this.numTotalContainers = numTotalContainers;
    }

    int getAllocatedContainers() {
      return this.numAllocatedContainers.get();
    }

    @Override
    void startTimelineClient(final Configuration conf) throws YarnException,
        IOException, InterruptedException {
      timelineClient = null;
    }
  }

  @SuppressWarnings("unchecked")
  @Test
  public void testDSAppMasterAllocateHandler() throws Exception {

    TestAppMaster master = new TestAppMaster();
    int targetContainers = 2;
    AMRMClientAsync mockClient = Mockito.mock(AMRMClientAsync.class);
    master.setAmRMClient(mockClient);
    master.setNumTotalContainers(targetContainers);
    Mockito.doNothing().when(mockClient)
        .addContainerRequest(Matchers.any(AMRMClient.ContainerRequest.class));

    ApplicationMaster.RMCallbackHandler handler = master.getRMCallbackHandler();

    List<Container> containers = new ArrayList<>(1);
    ContainerId id1 = BuilderUtils.newContainerId(1, 1, 1, 1);
    containers.add(generateContainer(id1));

    master.numRequestedContainers.set(targetContainers);

    // first allocate a single container, everything should be fine
    handler.onContainersAllocated(containers);
    Assert.assertEquals("Wrong container allocation count", 1,
        master.getAllocatedContainers());
    Mockito.verifyZeroInteractions(mockClient);
    Assert.assertEquals("Incorrect number of threads launched", 1,
        master.threadsLaunched);
    Assert.assertEquals("Incorrect YARN Shell IDs",
        Arrays.asList("1"), master.yarnShellIds);

    // now send 3 extra containers
    containers.clear();
    ContainerId id2 = BuilderUtils.newContainerId(1, 1, 1, 2);
    containers.add(generateContainer(id2));
    ContainerId id3 = BuilderUtils.newContainerId(1, 1, 1, 3);
    containers.add(generateContainer(id3));
    ContainerId id4 = BuilderUtils.newContainerId(1, 1, 1, 4);
    containers.add(generateContainer(id4));
    handler.onContainersAllocated(containers);
    Assert.assertEquals("Wrong final container allocation count", 4,
        master.getAllocatedContainers());

    Assert.assertEquals("Incorrect number of threads launched", 4,
        master.threadsLaunched);

    Assert.assertEquals("Incorrect YARN Shell IDs",
        Arrays.asList("1", "2", "3", "4"), master.yarnShellIds);

    // make sure we handle completion events correctly
    List<ContainerStatus> status = new ArrayList<>();
    status.add(generateContainerStatus(id1, ContainerExitStatus.SUCCESS));
    status.add(generateContainerStatus(id2, ContainerExitStatus.SUCCESS));
    status.add(generateContainerStatus(id3, ContainerExitStatus.ABORTED));
    status.add(generateContainerStatus(id4, ContainerExitStatus.ABORTED));
    handler.onContainersCompleted(status);

    Assert.assertEquals("Unexpected number of completed containers",
        targetContainers, master.getNumCompletedContainers());
    Assert.assertTrue("Master didn't finish containers as expected",
        master.getDone());

    // test for events from containers we know nothing about
    // these events should be ignored
    status = new ArrayList<>();
    ContainerId id5 = BuilderUtils.newContainerId(1, 1, 1, 5);
    status.add(generateContainerStatus(id5, ContainerExitStatus.ABORTED));
    Assert.assertEquals("Unexpected number of completed containers",
        targetContainers, master.getNumCompletedContainers());
    Assert.assertTrue("Master didn't finish containers as expected",
        master.getDone());
    status.add(generateContainerStatus(id5, ContainerExitStatus.SUCCESS));
    Assert.assertEquals("Unexpected number of completed containers",
        targetContainers, master.getNumCompletedContainers());
    Assert.assertTrue("Master didn't finish containers as expected",
        master.getDone());
  }

  private Container generateContainer(ContainerId cid) {
    return Container.newInstance(cid, NodeId.newInstance("host", 5000),
      "host:80", Resource.newInstance(1024, 1), Priority.newInstance(0), null);
  }

  private ContainerStatus
      generateContainerStatus(ContainerId id, int exitStatus) {
    return ContainerStatus.newInstance(id, ContainerState.COMPLETE, "",
      exitStatus);
  }

  @Test
  public void testTimelineClientInDSAppMaster() throws Exception {
    ApplicationMaster appMaster = new ApplicationMaster();
    appMaster.appSubmitterUgi =
        UserGroupInformation.createUserForTesting("foo", new String[]{"bar"});
    Configuration conf = new YarnConfiguration();
    conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, true);
    appMaster.startTimelineClient(conf);
    Assert.assertEquals(appMaster.appSubmitterUgi,
        ((TimelineClientImpl)appMaster.timelineClient).getUgi());
  }
}
