content: /*
   *
   *  * 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.ambari.server.checks;
  
  import static java.util.stream.Collectors.toSet;
  import static org.apache.ambari.server.state.MaintenanceState.OFF;
  
  import java.util.LinkedHashSet;
  import java.util.Set;
  
  import org.apache.ambari.annotations.UpgradeCheckInfo;
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.orm.entities.RepoOsEntity;
  import org.apache.ambari.server.orm.entities.RepositoryVersionEntity;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Host;
  import org.apache.ambari.server.state.StackId;
  import org.apache.ambari.spi.RepositoryVersion;
  import org.apache.ambari.spi.upgrade.UpgradeCheckDescription;
  import org.apache.ambari.spi.upgrade.UpgradeCheckGroup;
  import org.apache.ambari.spi.upgrade.UpgradeCheckRequest;
  import org.apache.ambari.spi.upgrade.UpgradeCheckResult;
  import org.apache.ambari.spi.upgrade.UpgradeCheckStatus;
  import org.apache.ambari.spi.upgrade.UpgradeCheckType;
  import org.apache.ambari.spi.upgrade.UpgradeType;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.inject.Singleton;
  
  /**
   * This checks if the source and target version has an entry for each OS type in the cluster.
   */
  @Singleton
  @UpgradeCheckInfo(
    group = UpgradeCheckGroup.REPOSITORY_VERSION,
    required = { UpgradeType.NON_ROLLING, UpgradeType.ROLLING })
  public class MissingOsInRepoVersionCheck extends ClusterCheck {
    public static final String SOURCE_OS = "source_os";
    public static final String TARGET_OS = "target_os";
  
    static final UpgradeCheckDescription MISSING_OS_IN_REPO_VERSION = new UpgradeCheckDescription("MISSING_OS_IN_REPO_VERSION",
        UpgradeCheckType.CLUSTER,
        "Missing OS in repository version.",
        new ImmutableMap.Builder<String, String>()
          .put(MissingOsInRepoVersionCheck.SOURCE_OS, "The source version must have an entry for each OS type in the cluster")
          .put(MissingOsInRepoVersionCheck.TARGET_OS, "The target version must have an entry for each OS type in the cluster")
          .build());
  
    public MissingOsInRepoVersionCheck() {
      super(MISSING_OS_IN_REPO_VERSION);
    }
  
    @Override
    public UpgradeCheckResult perform(UpgradeCheckRequest request) throws AmbariException {
      UpgradeCheckResult result = new UpgradeCheckResult(this);
  
      Set<String> osFamiliesInCluster = osFamiliesInCluster(cluster(request));
      if (!targetOsFamilies(request).containsAll(osFamiliesInCluster)) {
        result.setFailReason(getFailReason(TARGET_OS, result, request));
        result.setStatus(UpgradeCheckStatus.FAIL);
        result.setFailedOn(new LinkedHashSet<>(osFamiliesInCluster));
      } else if (!sourceOsFamilies(request).containsAll(osFamiliesInCluster)) {
        result.setFailReason(getFailReason(SOURCE_OS, result, request));
        result.setStatus(UpgradeCheckStatus.FAIL);
        result.setFailedOn(new LinkedHashSet<>(osFamiliesInCluster));
      }
  
      return result;
    }
  
    private Cluster cluster(UpgradeCheckRequest prerequisiteCheck) throws AmbariException {
      return clustersProvider.get().getCluster(prerequisiteCheck.getClusterName());
    }
  
    /**
     * @return set of each os family in the cluster, excluding hosts which are in maintenance state
     */
    private Set<String> osFamiliesInCluster(Cluster cluster) {
      return cluster.getHosts().stream()
        .filter(host -> host.getMaintenanceState(cluster.getClusterId()) == OFF)
        .map(Host::getOsFamily)
        .collect(toSet());
    }
  
    /**
     * @return set of each os family in the source stack
     */
    private Set<String> sourceOsFamilies(UpgradeCheckRequest request) throws AmbariException {
      StackId stackId = new StackId(request.getTargetRepositoryVersion().getStackId());
      return ambariMetaInfo.get().getStack(stackId).getRepositoriesByOs().keySet();
    }
  
    /**
     * @return set of each os family in the target repository
     */
    private Set<String> targetOsFamilies(UpgradeCheckRequest request) {
      RepositoryVersion repositoryVersion = request.getTargetRepositoryVersion();
      RepositoryVersionEntity entity = repositoryVersionDaoProvider.get().findByPK(
          repositoryVersion.getId());
  
      return entity
        .getRepoOsEntities()
        .stream()
        .map(RepoOsEntity::getFamily)
        .collect(toSet());
    }
  }
  