PolicyEngineAPI/src/main/java/org/openecomp/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.openecomp.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.apache.log4j.Logger;
  36 import org.glassfish.tyrus.client.ClientManager;
  37 import org.openecomp.policy.api.NotificationHandler;
  38 import org.openecomp.policy.api.NotificationScheme;
  39 import org.openecomp.policy.api.NotificationType;
  40 import org.openecomp.policy.api.PDPNotification;
  41 import org.openecomp.policy.std.NotificationStore;
  42 import org.openecomp.policy.std.StdPDPNotification;
  43
  44 import org.openecomp.policy.xacml.api.XACMLErrorConstants;
  45 import com.fasterxml.jackson.core.JsonParseException;
  46 import com.fasterxml.jackson.databind.JsonMappingException;
  47 import org.openecomp.policy.common.logging.flexlogger.*;
  48
  49 @ClientEndpoint
  50 public class AutoClientEnd {
  51         private static StdPDPNotification notification = null;
  52         private static StdPDPNotification oldNotification = null;
  53         private static ClientManager client = null;
  54         private static NotificationScheme scheme = null;
  55         private static NotificationHandler handler = null;
  56         private static String url = null;
  57         private static Session session = null;
  58         private static boolean status = false;
  59         private static boolean stop = false;
  60         private static boolean message = false;
  61         private static boolean error = false;
  62         private static Logger logger = FlexLogger.getLogger(AutoClientEnd.class.getName());
  63
  64         public static void setAuto(NotificationScheme scheme,
  65                         NotificationHandler handler) {
  66                 AutoClientEnd.scheme = scheme;
  67                 AutoClientEnd.handler = handler;
  68         }
  69
  70         public static void setScheme(NotificationScheme scheme) {
  71                 AutoClientEnd.scheme = scheme;
  72         }
  73
  74         public static boolean getStatus(){
  75                 return AutoClientEnd.status;
  76         }
  77
  78         public static String getURL() {
  79                 return AutoClientEnd.url;
  80         }
  81
  82         public static void start(String url) {
  83                 AutoClientEnd.url = url;
  84                 // Stop and Start needs to be done.
  85                 if (scheme != null && handler!=null) {
  86                         if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS) || scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
  87                                 if (AutoClientEnd.client == null) {
  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){
 103                                                                 if(oldNotification!=notification){
 104                                                                         oldNotification= notification;
 105                                                                         AutoClientEnd.notification = notification;
 106                                                                         callHandler();
 107                                                                 }
 108                                                         }
 109                                                         error = false;
 110                                                 }
 111                                                 //
 112                                         } catch (DeploymentException | IOException | URISyntaxException e) {
 113                                                 logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + e);
 114                                                 client = null;
 115                                                 status = false;
 116                                                 changeURL();
 117                                         }
 118                                 }
 119                         }
 120                 }
 121         }
 122
 123         private static void changeURL(){
 124                 // Change the PDP if it is not Up.
 125                 StdPolicyEngine.rotatePDPList();
 126                 start(StdPolicyEngine.getPDPURL());
 127         }
 128
 129         public static void stop() {
 130                 if (client != null) {
 131                         client.shutdown();
 132                         if(session!=null){
 133                                 try {
 134                                         stop = true;
 135                                         logger.info("\n Closing Auto Notification WebSocket Connection.. ");
 136                                         session.close();
 137                                         session = null;
 138                                 } catch (IOException e) {
 139                                         //
 140                                 }
 141                         }
 142                         client = null;
 143                         status = false;
 144                         stop = false;
 145                 }
 146         }
 147
 148         private static void callHandler() {
 149                 if (handler != null && scheme != null) {
 150                         if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS)) {
 151                                 boolean removed = false, updated = false;
 152                                 if (notification.getRemovedPolicies() != null && !notification.getRemovedPolicies().isEmpty()) {
 153                                         removed = true;
 154                                 }
 155                                 if (notification.getLoadedPolicies() != null && !notification.getLoadedPolicies().isEmpty()) {
 156                                         updated = true;
 157                                 }
 158                                 if (removed && updated) {
 159                                         notification.setNotificationType(NotificationType.BOTH);
 160                                 } else if (removed) {
 161                                         notification.setNotificationType(NotificationType.REMOVE);
 162                                 } else if (updated) {
 163                                         notification.setNotificationType(NotificationType.UPDATE);
 164                                 }
 165                                 try{
 166                                         handler.notificationReceived(notification);
 167                                 }catch (Exception e){
 168                                         logger.error("Error in Clients Handler Object : " + e.getMessage());
 169                                 }
 170                         } else if (scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
 171                                 PDPNotification newNotification = MatchStore.checkMatch(notification);
 172                                 if (newNotification.getNotificationType() != null) {
 173                                         handler.notificationReceived(newNotification);
 174                                 }
 175                         }
 176                 }
 177         }
 178
 179         // WebSockets Code..
 180         @OnOpen
 181         public void onOpen(Session session) throws IOException {
 182                 // session.getBasicRemote().sendText("Connected to Client with Session: "
 183                 // + session.getId());
 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 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                 // logger.error("Exception Occured"+e);
 195                 stop();
 196                 if (url != null) {
 197                         client = null;
 198                         status = false;
 199                         error= true;
 200                         start(url);
 201                 }
 202         }
 203
 204         @OnClose
 205         public void onClose(Session session) {
 206                 logger.info("Session ended with "+ session.getId());
 207                 if(!stop && !message){
 208                         // This Block of code is executed if there is any Network Failure or if the Notification is Down.
 209                         logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Disconnected from Notification Server");
 210                         client = null;
 211                         status = false;
 212                         AutoClientEnd.session=null;
 213                         // Try to connect Back to available PDP.
 214                         error = true;
 215                         start(url);
 216                 }
 217                 AutoClientEnd.message=false;
 218         }
 219
 220         @OnMessage
 221         public void onMessage(String message, Session session) throws JsonParseException, JsonMappingException, IOException {
 222                 AutoClientEnd.message = true;
 223                 logger.debug("Auto Notification Recieved Message " + message + " Session info is : " + session.getId());
 224                 try {
 225                         notification = NotificationUnMarshal.notificationJSON(message);
 226                 } catch (Exception e) {
 227                         logger.error("PE500 " + e);
 228                 }
 229                 if(AutoClientEnd.session == session){
 230                         try{
 231                                 NotificationStore.recordNotification(notification);
 232                         }catch(Exception e){
 233                                 logger.error(e);
 234                         }
 235                         if(oldNotification!=notification){
 236                                 oldNotification= notification;
 237                                 callHandler();
 238                         }
 239                 }else{
 240                         session.close();
 241                 }
 242                 AutoClientEnd.message = false;
 243         }
 244 }