PolicyEngineAPI/src/main/java/org/onap/policy/std/AutoClientEnd.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * PolicyEngineAPI
   4  * ================================================================================
   5  * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.onap.policy.std;
  22
  23 import java.io.IOException;
  24 import java.net.URI;
  25 import java.net.URISyntaxException;
  26
  27 import javax.websocket.ClientEndpoint;
  28 import javax.websocket.DeploymentException;
  29 import javax.websocket.OnClose;
  30 import javax.websocket.OnError;
  31 import javax.websocket.OnMessage;
  32 import javax.websocket.OnOpen;
  33 import javax.websocket.Session;
  34
  35 import org.glassfish.tyrus.client.ClientManager;
  36 import org.onap.policy.api.NotificationHandler;
  37 import org.onap.policy.api.NotificationScheme;
  38 import org.onap.policy.api.NotificationType;
  39 import org.onap.policy.api.PDPNotification;
  40 import org.onap.policy.common.logging.flexlogger.FlexLogger;
  41 import org.onap.policy.common.logging.flexlogger.Logger;
  42 import org.onap.policy.xacml.api.XACMLErrorConstants;
  43
  44 @ClientEndpoint
  45 public class AutoClientEnd {
  46         private static StdPDPNotification notification = null;
  47         private static StdPDPNotification oldNotification = null;
  48         private static ClientManager client = null;
  49         private static NotificationScheme scheme = null;
  50         private static NotificationHandler handler = null;
  51         private static String url = null;
  52         private static Session session = null;
  53         private static boolean status = false;
  54         private static boolean stop = false;
  55         private static boolean message = false;
  56         private static boolean error = false;
  57         private static Logger logger = FlexLogger.getLogger(AutoClientEnd.class.getName());
  58
  59         public static void setAuto(NotificationScheme scheme,
  60                         NotificationHandler handler) {
  61                 AutoClientEnd.scheme = scheme;
  62                 AutoClientEnd.handler = handler;
  63         }
  64
  65         public static void setScheme(NotificationScheme scheme) {
  66                 AutoClientEnd.scheme = scheme;
  67         }
  68
  69         public static boolean getStatus(){
  70                 return AutoClientEnd.status;
  71         }
  72
  73         public static String getURL() {
  74                 return AutoClientEnd.url;
  75         }
  76
  77         public static void start(String url) {
  78                 AutoClientEnd.url = url;
  79
  80                 if (scheme == null || handler == null ||
  81                         ! (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS) ||
  82                                         scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS) ) ||
  83                         AutoClientEnd.client != null) {
  84                         return;
  85                 }
  86
  87                 // Stop and Start needs to be done.
  88                 client = ClientManager.createClient();
  89                 if(url.contains("https")){
  90                         url = url.replaceAll("https", "wss");
  91                 }else {
  92                         url = url.replaceAll("http", "ws");
  93                 }
  94                 try {
  95                         logger.info("Starting Auto Notification with the PDP server : " + url);
  96                         client.connectToServer(AutoClientEnd.class, new URI(url + "notifications"));
  97                         status = true;
  98                         if(error){
  99                                 // The URL's will be in Sync according to design Spec.
 100                                 ManualClientEnd.start(AutoClientEnd.url);
 101                                 StdPDPNotification notification = NotificationStore.getDeltaNotification((StdPDPNotification)ManualClientEnd.result(NotificationScheme.MANUAL_ALL_NOTIFICATIONS));
 102                                 if(notification.getNotificationType()!=null&&oldNotification!=notification){
 103                                     oldNotification= notification;
 104                                     AutoClientEnd.notification = notification;
 105                                     callHandler();
 106                                 }
 107                                 error = false;
 108                         }
 109                         //
 110                 } catch (DeploymentException | IOException | URISyntaxException e) {
 111                         logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + e);
 112                         client = null;
 113                         status = false;
 114                         changeURL();
 115                 }
 116         }
 117
 118         private static void changeURL(){
 119                 // Change the PDP if it is not Up.
 120                 StdPolicyEngine.rotatePDPList();
 121                 start(StdPolicyEngine.getPDPURL());
 122         }
 123
 124         public static void stop() {
 125                 if (client == null) {
 126                         return;
 127                 }
 128                 client.shutdown();
 129                 if(session!=null){
 130                         try {
 131                                 stop = true;
 132                                 logger.info("\n Closing Auto Notification WebSocket Connection.. ");
 133                                 session.close();
 134                                 session = null;
 135                         } catch (IOException e) {
 136                                 logger.error("Error closing websocket connection", e);
 137                         }
 138                 }
 139                 client = null;
 140                 status = false;
 141                 stop = false;
 142         }
 143
 144         private static void callHandler() {
 145                 if (handler == null || scheme == null) {
 146                         return;
 147                 }
 148                 if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS)) {
 149                         boolean removed = false;
 150                         boolean updated = false;
 151                         if (notification.getRemovedPolicies() != null && !notification.getRemovedPolicies().isEmpty()) {
 152                                 removed = true;
 153                         }
 154                         if (notification.getLoadedPolicies() != null && !notification.getLoadedPolicies().isEmpty()) {
 155                                 updated = true;
 156                         }
 157                         if (removed && updated) {
 158                                 notification.setNotificationType(NotificationType.BOTH);
 159                         } else if (removed) {
 160                                 notification.setNotificationType(NotificationType.REMOVE);
 161                         } else if (updated) {
 162                                 notification.setNotificationType(NotificationType.UPDATE);
 163                         }
 164                         try{
 165                                 handler.notificationReceived(notification);
 166                         }catch (Exception e){
 167                                 logger.error("Error in Clients Handler Object : ", e);
 168                         }
 169                 } else if (scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
 170                         PDPNotification newNotification = MatchStore.checkMatch(notification);
 171                         if (newNotification.getNotificationType() != null) {
 172                                 try{
 173                                         handler.notificationReceived(newNotification);
 174                                 }catch (Exception e){
 175                                         logger.error("Error in Clients Handler Object : ", e);
 176                                 }
 177                         }
 178                 }
 179         }
 180
 181         // WebSockets Code..
 182         @OnOpen
 183         public static void onOpen(Session session){
 184                 logger.debug("Auto Notification Session Started... " + session.getId());
 185                 if(AutoClientEnd.session == null){
 186                         AutoClientEnd.session = session;
 187                 }
 188         }
 189
 190         @OnError
 191         public static void onError(Session session, Throwable e) {
 192                 // trying to Restart by self.
 193                 logger.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Session Error.. "+ session.getId() + "\n Error is : " + e );
 194                 stop();
 195                 if (url != null) {
 196                         client = null;
 197                         status = false;
 198                         error= true;
 199                         start(url);
 200                 }
 201         }
 202
 203         @OnClose
 204         public static void onClose(Session session) {
 205                 logger.info("Session ended with "+ session.getId());
 206                 if(!stop && !message){
 207                         // This Block of code is executed if there is any Network Failure or if the Notification is Down.
 208                         logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Disconnected from Notification Server");
 209                         client = null;
 210                         status = false;
 211                         AutoClientEnd.session=null;
 212                         // Try to connect Back to available PDP.
 213                         error = true;
 214                         start(url);
 215                 }
 216                 AutoClientEnd.message=false;
 217         }
 218
 219         @OnMessage
 220         public static void onMessage(String message, Session session) throws IOException {
 221                 AutoClientEnd.message = true;
 222                 logger.debug("Auto Notification Recieved Message " + message + " Session info is : " + session.getId());
 223                 try {
 224                         notification = NotificationUnMarshal.notificationJSON(message);
 225                 } catch (Exception e) {
 226                         logger.error("PE500 " + e);
 227                 }
 228                 if(AutoClientEnd.session == session){
 229                         try{
 230                                 NotificationStore.recordNotification(notification);
 231                         }catch(Exception e){
 232                                 logger.error(e);
 233                         }
 234                         if(oldNotification!=notification){
 235                                 oldNotification= notification;
 236                                 callHandler();
 237                         }
 238                 }else{
 239                         session.close();
 240                 }
 241                 AutoClientEnd.message = false;
 242         }
 243 }