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/*-
* ============LICENSE_START=======================================================
* PolicyEngineAPI
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.policy.std;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import javax.websocket.ClientEndpoint;
import javax.websocket.DeploymentException;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
//import org.apache.log4j.Logger;
import org.glassfish.tyrus.client.ClientManager;
import org.openecomp.policy.api.NotificationHandler;
import org.openecomp.policy.api.NotificationScheme;
import org.openecomp.policy.api.NotificationType;
import org.openecomp.policy.api.PDPNotification;
import org.openecomp.policy.std.NotificationStore;
import org.openecomp.policy.std.StdPDPNotification;
import org.openecomp.policy.xacml.api.XACMLErrorConstants;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import org.openecomp.policy.common.logging.flexlogger.*;
@ClientEndpoint
public class AutoClientEnd {
private static StdPDPNotification notification = null;
private static StdPDPNotification oldNotification = null;
private static ClientManager client = null;
private static NotificationScheme scheme = null;
private static NotificationHandler handler = null;
private static String url = null;
private static Session session = null;
private static boolean status = false;
private static boolean stop = false;
private static boolean message = false;
private static boolean error = false;
private static Logger logger = FlexLogger.getLogger(AutoClientEnd.class.getName());
public static void setAuto(NotificationScheme scheme,
NotificationHandler handler) {
AutoClientEnd.scheme = scheme;
AutoClientEnd.handler = handler;
}
public static void setScheme(NotificationScheme scheme) {
AutoClientEnd.scheme = scheme;
}
public static boolean getStatus(){
return AutoClientEnd.status;
}
public static String getURL() {
return AutoClientEnd.url;
}
public static void start(String url) {
AutoClientEnd.url = url;
// Stop and Start needs to be done.
if (scheme != null && handler!=null) {
if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS) || scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
if (AutoClientEnd.client == null) {
client = ClientManager.createClient();
if(url.contains("https")){
url = url.replaceAll("https", "wss");
}else {
url = url.replaceAll("http", "ws");
}
try {
logger.info("Starting Auto Notification with the PDP server : " + url);
client.connectToServer(AutoClientEnd.class, new URI(url + "notifications"));
status = true;
if(error){
// The URL's will be in Sync according to design Spec.
ManualClientEnd.start(AutoClientEnd.url);
StdPDPNotification notification = NotificationStore.getDeltaNotification((StdPDPNotification)ManualClientEnd.result(NotificationScheme.MANUAL_ALL_NOTIFICATIONS));
if(notification.getNotificationType()!=null){
if(oldNotification!=notification){
oldNotification= notification;
AutoClientEnd.notification = notification;
callHandler();
}
}
error = false;
}
//
} catch (DeploymentException | IOException | URISyntaxException e) {
logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + e);
client = null;
status = false;
changeURL();
}
}
}
}
}
private static void changeURL(){
// Change the PDP if it is not Up.
StdPolicyEngine.rotateList();
start(StdPolicyEngine.getPDPURL());
}
public static void stop() {
if (client != null) {
client.shutdown();
if(session!=null){
try {
stop = true;
logger.info("\n Closing Auto Notification WebSocket Connection.. ");
session.close();
session = null;
} catch (IOException e) {
//
}
}
client = null;
status = false;
stop = false;
}
}
private static void callHandler() {
if (handler != null && scheme != null) {
if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS)) {
boolean removed = false, updated = false;
if (notification.getRemovedPolicies() != null && !notification.getRemovedPolicies().isEmpty()) {
removed = true;
}
if (notification.getLoadedPolicies() != null && !notification.getLoadedPolicies().isEmpty()) {
updated = true;
}
if (removed && updated) {
notification.setNotificationType(NotificationType.BOTH);
} else if (removed) {
notification.setNotificationType(NotificationType.REMOVE);
} else if (updated) {
notification.setNotificationType(NotificationType.UPDATE);
}
try{
handler.notificationReceived(notification);
}catch (Exception e){
logger.error("Error in Clients Handler Object : " + e.getMessage());
}
} else if (scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
PDPNotification newNotification = MatchStore.checkMatch(notification);
if (newNotification.getNotificationType() != null) {
handler.notificationReceived(newNotification);
}
}
}
}
// WebSockets Code..
@OnOpen
public void onOpen(Session session) throws IOException {
// session.getBasicRemote().sendText("Connected to Client with Session: "
// + session.getId());
logger.debug("Auto Notification Session Started... " + session.getId());
if(AutoClientEnd.session == null){
AutoClientEnd.session = session;
}
}
@OnError
public void onError(Session session, Throwable e) {
// trying to Restart by self.
logger.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Session Error.. "+ session.getId() + "\n Error is : " + e );
// e.printStackTrace();
stop();
if (url != null) {
client = null;
status = false;
error= true;
start(url);
}
}
@OnClose
public void onClose(Session session) {
logger.info("Session ended with "+ session.getId());
if(!stop && !message){
// This Block of code is executed if there is any Network Failure or if the Notification is Down.
logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Disconnected from Notification Server");
client = null;
status = false;
AutoClientEnd.session=null;
// Try to connect Back to available PDP.
error = true;
start(url);
}
AutoClientEnd.message=false;
}
@OnMessage
public void onMessage(String message, Session session) throws JsonParseException, JsonMappingException, IOException {
AutoClientEnd.message = true;
logger.debug("Auto Notification Recieved Message " + message + " Session info is : " + session.getId());
try {
notification = NotificationUnMarshal.notificationJSON(message);
} catch (Exception e) {
logger.error("PE500 " + e);
}
if(AutoClientEnd.session == session){
try{
NotificationStore.recordNotification(notification);
}catch(Exception e){
logger.error(e);
}
if(oldNotification!=notification){
oldNotification= notification;
callHandler();
}
}else{
session.close();
}
AutoClientEnd.message = false;
}
}
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