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.Arrays.asList;
  import static org.apache.ambari.server.state.AlertState.CRITICAL;
  import static org.apache.ambari.server.state.AlertState.WARNING;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.ambari.annotations.UpgradeCheckInfo;
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.orm.dao.AlertsDAO;
  import org.apache.ambari.server.orm.entities.AlertCurrentEntity;
  import org.apache.ambari.server.orm.entities.AlertHistoryEntity;
  import org.apache.ambari.server.state.AlertState;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.MaintenanceState;
  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 org.apache.commons.lang.StringUtils;
  
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.common.collect.ImmutableMap;
  import com.google.inject.Inject;
  import com.google.inject.Provider;
  import com.google.inject.Singleton;
  
  /**
   * Checks that there are no WARNING/CRITICAL alerts on current cluster.
   * That is a potential problem when doing stack update.
   */
  @Singleton
  @UpgradeCheckInfo(
      group = UpgradeCheckGroup.DEFAULT,
      required = { UpgradeType.ROLLING, UpgradeType.NON_ROLLING, UpgradeType.HOST_ORDERED })
  public class HealthCheck extends ClusterCheck {
  
    private static final List<AlertState> ALERT_STATES = asList(WARNING, CRITICAL);
  
    @Inject
    Provider<AlertsDAO> alertsDAOProvider;
  
    static final UpgradeCheckDescription HEALTH = new UpgradeCheckDescription("HEALTH",
        UpgradeCheckType.CLUSTER,
        "Cluster Health",
        new ImmutableMap.Builder<String, String>()
          .put(UpgradeCheckDescription.DEFAULT,
              "The following issues have been detected on this cluster and should be addressed before upgrading: %s").build());
  
    /**
     * Constructor.
     */
    public HealthCheck() {
      super(HEALTH);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public UpgradeCheckResult perform(UpgradeCheckRequest request)
        throws AmbariException {
      UpgradeCheckResult result = new UpgradeCheckResult(this);
  
      AlertsDAO alertsDAO = alertsDAOProvider.get();
      final String clusterName = request.getClusterName();
      final Cluster cluster = clustersProvider.get().getCluster(clusterName);
      List<AlertCurrentEntity> alerts = alertsDAO.findCurrentByCluster(cluster.getClusterId());
  
      List<String> errorMessages = new ArrayList<>();
  
      for (AlertCurrentEntity alert : alerts) {
        AlertHistoryEntity alertHistory = alert.getAlertHistory();
        AlertState alertState = alertHistory.getAlertState();
        if (ALERT_STATES.contains(alertState) && !alert.getMaintenanceState().equals(MaintenanceState.ON)) {
          String state = alertState.name();
          String label = alertHistory.getAlertDefinition().getLabel();
          String hostName = alertHistory.getHostName();
  
          if (hostName == null) {
            errorMessages.add(state + ": " + label);
          } else {
            errorMessages.add(state + ": " + label + ": " + hostName);
          }
          result.getFailedDetail().add(new AlertDetail(state, label, hostName));
        }
      }
  
      if (!errorMessages.isEmpty()) {
        result.getFailedOn().add(clusterName);
        result.setStatus(UpgradeCheckStatus.WARNING);
        String failReason = getFailReason(result, request);
        result.setFailReason(
            String.format(failReason, StringUtils.join(errorMessages, System.lineSeparator())));
      }
  
      return result;
    }
  
    /**
     * Used to represent specific detail about alert.
     */
    private static class AlertDetail {
      @JsonProperty("state")
      public String state;
  
      @JsonProperty("label")
      public String label;
  
      @JsonProperty("host_name")
      public String hostName;
  
      AlertDetail(String state, String label, String hostName) {
        this.state = state;
        this.label = label;
        this.hostName = hostName;
      }
    }
  }
  