gerrit.onap Code Review - policy/apex-pdp.git/blob

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2019 Nordix Foundation.
   4  * ================================================================================
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  * SPDX-License-Identifier: Apache-2.0
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.onap.policy.apex.services.onappf.handler;
  22
  23 import java.util.Collections;
  24 import java.util.HashSet;
  25 import java.util.List;
  26 import org.onap.policy.apex.services.onappf.ApexStarterConstants;
  27 import org.onap.policy.apex.services.onappf.comm.PdpStatusPublisher;
  28 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
  29 import org.onap.policy.common.endpoints.event.comm.TopicSink;
  30 import org.onap.policy.common.utils.services.Registry;
  31 import org.onap.policy.models.pdp.concepts.PdpResponseDetails;
  32 import org.onap.policy.models.pdp.concepts.PdpStatus;
  33 import org.onap.policy.models.pdp.concepts.PdpUpdate;
  34 import org.onap.policy.models.pdp.enums.PdpResponseStatus;
  35 import org.onap.policy.models.pdp.enums.PdpState;
  36 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyIdentifier;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 /**
  41  * This class supports the handling of pdp update messages.
  42  *
  43  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  44  */
  45 public class PdpUpdateMessageHandler {
  46
  47     private static final Logger LOGGER = LoggerFactory.getLogger(PdpUpdateMessageHandler.class);
  48
  49     /**
  50      * Method which handles a pdp update event from PAP.
  51      *
  52      * @param pdpUpdateMsg pdp update message
  53      */
  54     public void handlePdpUpdateEvent(final PdpUpdate pdpUpdateMsg) {
  55         final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
  56         final PdpStatus pdpStatusContext = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT, PdpStatus.class);
  57         PdpResponseDetails pdpResponseDetails = null;
  58         if (pdpUpdateMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
  59                 pdpStatusContext.getPdpSubgroup())) {
  60             if (checkIfAlreadyHandled(pdpUpdateMsg, pdpStatusContext)) {
  61                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
  62                         PdpResponseStatus.SUCCESS, "Pdp already updated");
  63             } else {
  64                 pdpResponseDetails = handlePdpUpdate(pdpUpdateMsg, pdpMessageHandler, pdpStatusContext);
  65             }
  66             final PdpStatusPublisher pdpStatusPublisherTemp =
  67                     Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
  68             final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
  69             pdpStatus.setResponse(pdpResponseDetails);
  70             pdpStatus.setDescription("Pdp status response message for PdpUpdate");
  71             pdpStatusPublisherTemp.send(pdpStatus);
  72         }
  73     }
  74
  75     /**
  76      * Method to do pdp update.
  77      *
  78      * @param pdpUpdateMsg the pdp update message
  79      * @param pdpMessageHandler the message handler
  80      * @param pdpStatusContext the pdp status in memory
  81      * @return pdpResponseDetails the pdp response
  82      */
  83     private PdpResponseDetails handlePdpUpdate(final PdpUpdate pdpUpdateMsg, final PdpMessageHandler pdpMessageHandler,
  84         final PdpStatus pdpStatusContext) {
  85         PdpResponseDetails pdpResponseDetails = null;
  86         final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
  87         if (null != pdpUpdateMsg.getPdpHeartbeatIntervalMs() && pdpUpdateMsg.getPdpHeartbeatIntervalMs() > 0
  88                 && pdpStatusPublisher.getInterval() != pdpUpdateMsg.getPdpHeartbeatIntervalMs()) {
  89             updateInterval(pdpUpdateMsg.getPdpHeartbeatIntervalMs());
  90         }
  91         pdpStatusContext.setPdpGroup(pdpUpdateMsg.getPdpGroup());
  92         pdpStatusContext.setPdpSubgroup(pdpUpdateMsg.getPdpSubgroup());
  93         pdpStatusContext
  94                 .setPolicies(new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPolicies()));
  95         Registry.registerOrReplace(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST, pdpUpdateMsg.getPolicies());
  96         if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
  97             pdpResponseDetails = startOrStopApexEngineBasedOnPolicies(pdpUpdateMsg, pdpMessageHandler);
  98
  99             ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
 100             // in hearbeat while in active state, only the policies which are running should be there.
 101             // if some policy fails, that shouldn't go in the heartbeat.
 102             // If no policies are running, then the policy list in the heartbeat can be empty
 103             if (null != apexEngineHandler && apexEngineHandler.isApexEngineRunning()) {
 104                 pdpStatusContext.setPolicies(apexEngineHandler.getRunningPolicies());
 105             } else {
 106                 pdpStatusContext.setPolicies(Collections.emptyList());
 107             }
 108         }
 109         if (null == pdpResponseDetails) {
 110             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 111                     PdpResponseStatus.SUCCESS, "Pdp update successful.");
 112         }
 113         return pdpResponseDetails;
 114     }
 115
 116     /**
 117      * Method to start or stop apex engine based on the list of policies received from pap. When current state is
 118      * active, if PAP sends PdpUpdate with empty policies list, stop apex engine, or, if there is a change in policies,
 119      * stop the current running policies and the deploy the new ones.
 120      *
 121      * @param pdpUpdateMsg the pdp update message from pap
 122      * @param pdpMessageHandler pdp message handler
 123      * @param pdpStatusContext the pdp status object in memory
 124      * @return pdpResponseDetails the pdp response
 125      */
 126     private PdpResponseDetails startOrStopApexEngineBasedOnPolicies(final PdpUpdate pdpUpdateMsg,
 127             final PdpMessageHandler pdpMessageHandler) {
 128         PdpResponseDetails pdpResponseDetails = null;
 129         ApexEngineHandler apexEngineHandler = null;
 130         try {
 131             apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
 132         } catch (final IllegalArgumentException e) {
 133             LOGGER.debug("ApenEngineHandler not in registry.", e);
 134         }
 135         if (pdpUpdateMsg.getPolicies().isEmpty()) {
 136             pdpResponseDetails = stopApexEngineBasedOnPolicies(pdpUpdateMsg, pdpMessageHandler, apexEngineHandler);
 137         } else {
 138             pdpResponseDetails = startApexEngineBasedOnPolicies(pdpUpdateMsg, pdpMessageHandler, apexEngineHandler);
 139         }
 140         return pdpResponseDetails;
 141     }
 142
 143     private PdpResponseDetails stopApexEngineBasedOnPolicies(final PdpUpdate pdpUpdateMsg,
 144         final PdpMessageHandler pdpMessageHandler, ApexEngineHandler apexEngineHandler) {
 145         PdpResponseDetails pdpResponseDetails = null;
 146         if (null != apexEngineHandler && apexEngineHandler.isApexEngineRunning()) {
 147             try {
 148                 apexEngineHandler.shutdown();
 149                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 150                     PdpResponseStatus.SUCCESS, "Pdp update successful. No policies are running.");
 151             } catch (final ApexStarterException e) {
 152                 LOGGER.error("Pdp update failed as the policies couldn't be undeployed.", e);
 153                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 154                         PdpResponseStatus.FAIL, "Pdp update failed as the policies couldn't be undeployed.");
 155             }
 156         }
 157         return pdpResponseDetails;
 158     }
 159
 160     private PdpResponseDetails startApexEngineBasedOnPolicies(final PdpUpdate pdpUpdateMsg,
 161         final PdpMessageHandler pdpMessageHandler, ApexEngineHandler apexEngineHandler) {
 162         PdpResponseDetails pdpResponseDetails = null;
 163         try {
 164             if (null != apexEngineHandler && apexEngineHandler.isApexEngineRunning()) {
 165                 apexEngineHandler.updateApexEngine(pdpUpdateMsg.getPolicies());
 166             } else {
 167                 apexEngineHandler = new ApexEngineHandler(pdpUpdateMsg.getPolicies());
 168                 Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
 169             }
 170             if (apexEngineHandler.isApexEngineRunning()) {
 171                 List<ToscaPolicyIdentifier> runningPolicies = apexEngineHandler.getRunningPolicies();
 172                 if (new HashSet<>(runningPolicies)
 173                     .equals(new HashSet<>(pdpMessageHandler.getToscaPolicyIdentifiers(pdpUpdateMsg.getPolicies())))) {
 174                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 175                         PdpResponseStatus.SUCCESS, "Apex engine started and policies are running.");
 176                 } else {
 177                     StringBuilder message =
 178                         new StringBuilder("Apex engine started. But, only the following polices are running - ");
 179                     for (ToscaPolicyIdentifier policy : runningPolicies) {
 180                         message.append(policy.getName()).append(":").append(policy.getVersion()).append("  ");
 181                     }
 182                     message.append(". Other policies failed execution. Please see the logs for more details.");
 183                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 184                         PdpResponseStatus.SUCCESS, message.toString());
 185                 }
 186             } else {
 187                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 188                     PdpResponseStatus.FAIL, "Apex engine failed to start.");
 189             }
 190         } catch (final ApexStarterException e) {
 191             LOGGER.error("Apex engine service running failed. ", e);
 192             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
 193                     PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
 194         }
 195         return pdpResponseDetails;
 196     }
 197
 198     /**
 199      * Method checks if the Pdp update message is already handled by checking the values in the context.
 200      *
 201      * @param pdpUpdateMsg pdp update message received from pap
 202      * @param pdpStatusContext values saved in context memory
 203      * @return boolean flag which tells if the information is same or not
 204      */
 205     private boolean checkIfAlreadyHandled(final PdpUpdate pdpUpdateMsg, final PdpStatus pdpStatusContext) {
 206         return null != pdpStatusContext.getPdpGroup()
 207                 && pdpStatusContext.getPdpGroup().equals(pdpUpdateMsg.getPdpGroup())
 208                 && null != pdpStatusContext.getPdpSubgroup()
 209                 && pdpStatusContext.getPdpSubgroup().equals(pdpUpdateMsg.getPdpSubgroup())
 210                 && null != pdpStatusContext.getPolicies() && new PdpMessageHandler()
 211                         .getToscaPolicyIdentifiers(pdpUpdateMsg.getPolicies()).equals(pdpStatusContext.getPolicies());
 212     }
 213
 214     /**
 215      * Method to update the time interval used by the timer task.
 216      *
 217      * @param interval time interval received in the pdp update message from pap
 218      */
 219     public void updateInterval(final long interval) {
 220         final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
 221         pdpStatusPublisher.terminate();
 222         final List<TopicSink> topicSinks = Registry.get(ApexStarterConstants.REG_APEX_PDP_TOPIC_SINKS);
 223         Registry.registerOrReplace(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER,
 224                 new PdpStatusPublisher(topicSinks, interval));
 225     }
 226 }