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

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * PolicyEngineAPI
   4  * ================================================================================
   5  * Copyright (C) 2017 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                 // Stop and Start needs to be done.
  80                 if (scheme != null && handler!=null) {
  81                         if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS) || scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
  82                                 if (AutoClientEnd.client == null) {
  83                                         client = ClientManager.createClient();
  84                                         if(url.contains("https")){
  85                                                 url = url.replaceAll("https", "wss");
  86                                         }else {
  87                                                 url = url.replaceAll("http", "ws");
  88                                         }
  89                                         try {
  90                                                 logger.info("Starting Auto Notification with the PDP server : " + url);
  91                                                 client.connectToServer(AutoClientEnd.class, new URI(url + "notifications"));
  92                                                 status = true;
  93                                                 if(error){
  94                                                         // The URL's will be in Sync according to design Spec.
  95                                                         ManualClientEnd.start(AutoClientEnd.url);
  96                                                         StdPDPNotification notification = NotificationStore.getDeltaNotification((StdPDPNotification)ManualClientEnd.result(NotificationScheme.MANUAL_ALL_NOTIFICATIONS));
  97                                                         if(notification.getNotificationType()!=null&&oldNotification!=notification){
  98                                                             oldNotification= notification;
  99                                                             AutoClientEnd.notification = notification;
 100                                                             callHandler();
 101                                                         }
 102                                                         error = false;
 103                                                 }
 104                                                 //
 105                                         } catch (DeploymentException | IOException | URISyntaxException e) {
 106                                                 logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + e);
 107                                                 client = null;
 108                                                 status = false;
 109                                                 changeURL();
 110                                         }
 111                                 }
 112                         }
 113                 }
 114         }
 115
 116         private static void changeURL(){
 117                 // Change the PDP if it is not Up.
 118                 StdPolicyEngine.rotatePDPList();
 119                 start(StdPolicyEngine.getPDPURL());
 120         }
 121
 122         public static void stop() {
 123                 if (client != null) {
 124                         client.shutdown();
 125                         if(session!=null){
 126                                 try {
 127                                         stop = true;
 128                                         logger.info("\n Closing Auto Notification WebSocket Connection.. ");
 129                                         session.close();
 130                                         session = null;
 131                                 } catch (IOException e) {
 132                                         logger.error("Error closing websocket connection", e);
 133                                 }
 134                         }
 135                         client = null;
 136                         status = false;
 137                         stop = false;
 138                 }
 139         }
 140
 141         private static void callHandler() {
 142                 if (handler != null && scheme != null) {
 143                         if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS)) {
 144                                 boolean removed = false;
 145                                 boolean updated = false;
 146                                 if (notification.getRemovedPolicies() != null && !notification.getRemovedPolicies().isEmpty()) {
 147                                         removed = true;
 148                                 }
 149                                 if (notification.getLoadedPolicies() != null && !notification.getLoadedPolicies().isEmpty()) {
 150                                         updated = true;
 151                                 }
 152                                 if (removed && updated) {
 153                                         notification.setNotificationType(NotificationType.BOTH);
 154                                 } else if (removed) {
 155                                         notification.setNotificationType(NotificationType.REMOVE);
 156                                 } else if (updated) {
 157                                         notification.setNotificationType(NotificationType.UPDATE);
 158                                 }
 159                                 try{
 160                                         handler.notificationReceived(notification);
 161                                 }catch (Exception e){
 162                                         logger.error("Error in Clients Handler Object : ", e);
 163                                 }
 164                         } else if (scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
 165                                 PDPNotification newNotification = MatchStore.checkMatch(notification);
 166                                 if (newNotification.getNotificationType() != null) {
 167                                         try{
 168                                                 handler.notificationReceived(newNotification);
 169                                         }catch (Exception e){
 170                                                 logger.error("Error in Clients Handler Object : ", e);
 171                                         }
 172                                 }
 173                         }
 174                 }
 175         }
 176
 177         // WebSockets Code..
 178         @OnOpen
 179         public static void onOpen(Session session){
 180                 logger.debug("Auto Notification Session Started... " + session.getId());
 181                 if(AutoClientEnd.session == null){
 182                         AutoClientEnd.session = session;
 183                 }
 184         }
 185
 186         @OnError
 187         public static void onError(Session session, Throwable e) {
 188                 // trying to Restart by self.
 189                 logger.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Session Error.. "+ session.getId() + "\n Error is : " + e );
 190                 stop();
 191                 if (url != null) {
 192                         client = null;
 193                         status = false;
 194                         error= true;
 195                         start(url);
 196                 }
 197         }
 198
 199         @OnClose
 200         public static void onClose(Session session) {
 201                 logger.info("Session ended with "+ session.getId());
 202                 if(!stop && !message){
 203                         // This Block of code is executed if there is any Network Failure or if the Notification is Down.
 204                         logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Disconnected from Notification Server");
 205                         client = null;
 206                         status = false;
 207                         AutoClientEnd.session=null;
 208                         // Try to connect Back to available PDP.
 209                         error = true;
 210                         start(url);
 211                 }
 212                 AutoClientEnd.message=false;
 213         }
 214
 215         @OnMessage
 216         public static void onMessage(String message, Session session) throws IOException {
 217                 AutoClientEnd.message = true;
 218                 logger.debug("Auto Notification Recieved Message " + message + " Session info is : " + session.getId());
 219                 try {
 220                         notification = NotificationUnMarshal.notificationJSON(message);
 221                 } catch (Exception e) {
 222                         logger.error("PE500 " + e);
 223                 }
 224                 if(AutoClientEnd.session == session){
 225                         try{
 226                                 NotificationStore.recordNotification(notification);
 227                         }catch(Exception e){
 228                                 logger.error(e);
 229                         }
 230                         if(oldNotification!=notification){
 231                                 oldNotification= notification;
 232                                 callHandler();
 233                         }
 234                 }else{
 235                         session.close();
 236                 }
 237                 AutoClientEnd.message = false;
 238         }
 239 }