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 com.cloud.vm;
  
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.inject.Inject;
  
  import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
  import org.apache.cloudstack.framework.events.EventDistributor;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.springframework.beans.factory.NoSuchBeanDefinitionException;
  
  import com.cloud.configuration.Config;
  import com.cloud.event.EventCategory;
  import com.cloud.event.EventTypes;
  import com.cloud.event.UsageEventUtils;
  import com.cloud.event.dao.UsageEventDao;
  import com.cloud.network.dao.NetworkDao;
  import com.cloud.network.dao.NetworkVO;
  import com.cloud.server.ManagementService;
  import com.cloud.service.dao.ServiceOfferingDao;
  import com.cloud.utils.component.ComponentContext;
  import com.cloud.utils.fsm.StateListener;
  import com.cloud.utils.fsm.StateMachine2;
  import com.cloud.vm.VirtualMachine.Event;
  import com.cloud.vm.VirtualMachine.State;
  import com.cloud.vm.dao.NicDao;
  import com.cloud.vm.dao.UserVmDao;
  
  public class UserVmStateListener implements StateListener<State, VirtualMachine.Event, VirtualMachine> {
  
      @Inject protected UsageEventDao _usageEventDao;
      @Inject protected NetworkDao _networkDao;
      @Inject protected NicDao _nicDao;
      @Inject protected ServiceOfferingDao _offeringDao;
      @Inject protected UserVmDao _userVmDao;
      @Inject protected UserVmManager _userVmMgr;
      @Inject protected ConfigurationDao _configDao;
      private EventDistributor eventDistributor;
      protected Logger logger = LogManager.getLogger(getClass());
  
      public UserVmStateListener(UsageEventDao usageEventDao, NetworkDao networkDao, NicDao nicDao, ServiceOfferingDao offeringDao, UserVmDao userVmDao, UserVmManager userVmMgr,
              ConfigurationDao configDao) {
          this._usageEventDao = usageEventDao;
          this._networkDao = networkDao;
          this._nicDao = nicDao;
          this._offeringDao = offeringDao;
          this._userVmDao = userVmDao;
          this._userVmMgr = userVmMgr;
          this._configDao = configDao;
      }
  
      @Override
      public boolean preStateTransitionEvent(State oldState, Event event, State newState, VirtualMachine vo, boolean status, Object opaque) {
          pubishOnEventBus(event.name(), "preStateTransitionEvent", vo, oldState, newState);
          return true;
      }
  
      @Override
      public boolean postStateTransitionEvent(StateMachine2.Transition<State, Event> transition, VirtualMachine vo, boolean status, Object opaque) {
        if (!status) {
          return false;
        }
        Event event = transition.getEvent();
        State oldState = transition.getCurrentState();
        State newState = transition.getToState();
        pubishOnEventBus(event.name(), "postStateTransitionEvent", vo, oldState, newState);
  
        if (vo.getType() != VirtualMachine.Type.User) {
          return true;
        }
  
        if(transition.isImpacted(StateMachine2.Transition.Impact.USAGE)) {
          if (oldState == State.Destroyed && newState == State.Stopped) {
            generateUsageEvent(vo.getServiceOfferingId(), vo, EventTypes.EVENT_VM_CREATE);
          } else if (newState == State.Running) {
            generateUsageEvent(vo.getServiceOfferingId(), vo, EventTypes.EVENT_VM_START);
          } else if (newState == State.Stopped) {
            generateUsageEvent(vo.getServiceOfferingId(), vo, EventTypes.EVENT_VM_STOP);
            List<NicVO> nics = _nicDao.listByVmId(vo.getId());
            for (NicVO nic : nics) {
              NetworkVO network = _networkDao.findById(nic.getNetworkId());
              UsageEventUtils.publishUsageEvent(EventTypes.EVENT_NETWORK_OFFERING_REMOVE, vo.getAccountId(), vo.getDataCenterId(), vo.getId(),
                      Long.toString(nic.getId()), network.getNetworkOfferingId(), null, 0L, vo.getClass().getName(), vo.getUuid(), vo.isDisplay());
            }
          } else if (newState == State.Destroyed || newState == State.Error || newState == State.Expunging) {
            generateUsageEvent(vo.getServiceOfferingId(), vo, EventTypes.EVENT_VM_DESTROY);
          }
        }
        return true;
      }
  
    private void generateUsageEvent(Long serviceOfferingId, VirtualMachine vm,  String eventType){
          boolean displayVm = true;
          if(vm.getType() == VirtualMachine.Type.User){
              UserVmVO uservm = _userVmDao.findById(vm.getId());
              displayVm = uservm.isDisplayVm();
          }
  
          _userVmMgr.generateUsageEvent(vm, displayVm, eventType);
      }
  
      private void pubishOnEventBus(String event, String status, VirtualMachine vo, VirtualMachine.State oldState, VirtualMachine.State newState) {
  
          String configKey = Config.PublishResourceStateEvent.key();
          String value = _configDao.getValue(configKey);
          boolean configValue = Boolean.parseBoolean(value);
          if(!configValue)
              return;
          try {
              eventDistributor = ComponentContext.getComponent(EventDistributor.class);
          } catch (NoSuchBeanDefinitionException nbe) {
              return; // no provider is configured to provide events distributor, so just return
          }
  
          String resourceName = getEntityFromClassName(VirtualMachine.class.getName());
          org.apache.cloudstack.framework.events.Event eventMsg =
              new org.apache.cloudstack.framework.events.Event(ManagementService.Name, EventCategory.RESOURCE_STATE_CHANGE_EVENT.getName(), event, resourceName,
                  vo.getUuid());
          Map<String, String> eventDescription = new HashMap<>();
          eventDescription.put("resource", resourceName);
          eventDescription.put("id", vo.getUuid());
          eventDescription.put("old-state", oldState.name());
          eventDescription.put("new-state", newState.name());
          eventDescription.put("status", status);
  
          String eventDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z").format(new Date());
          eventDescription.put("eventDateTime", eventDate);
  
          eventMsg.setDescription(eventDescription);
          eventDistributor.publish(eventMsg);
      }
  
      private String getEntityFromClassName(String entityClassName) {
          int index = entityClassName.lastIndexOf(".");
          String entityName = entityClassName;
          if (index != -1) {
              entityName = entityClassName.substring(index + 1);
          }
          return entityName;
      }
  }
  