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/*-
* ============LICENSE_START=======================================================
* PolicyEngineAPI
* ================================================================================
* Copyright (C) 2017-2018 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.onap.policy.std;
import java.net.URI;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ServerHandshake;
import org.onap.policy.api.NotificationHandler;
import org.onap.policy.api.NotificationScheme;
import org.onap.policy.api.NotificationType;
import org.onap.policy.api.PDPNotification;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.xacml.api.XACMLErrorConstants;
public class AutoClientEnd extends WebSocketClient {
private static volatile StdPDPNotification notification = null;
private static volatile StdPDPNotification oldNotification = null;
private static volatile AutoClientEnd client = null;
private static volatile NotificationScheme scheme = null;
private static volatile NotificationHandler handler = null;
private static volatile String url = null;
private static volatile boolean status = false;
private static volatile boolean stop = false;
private static volatile boolean error = false;
private static volatile boolean restartNeeded = false;
private static volatile ScheduledExecutorService restartExecutorService = null;
private static final Logger logger = FlexLogger.getLogger(AutoClientEnd.class.getName());
private AutoClientEnd(URI serverUri) {
super(serverUri);
}
@Override
public void onMessage(String msg) {
logger.info("Received Auto Notification from : " + getURI() + ", Notification: " + msg);
try {
AutoClientEnd.notification = NotificationUnMarshal.notificationJSON(msg);
} catch (Exception e) {
logger.error("PE500 " + e);
}
try {
NotificationStore.recordNotification(notification);
} catch (Exception e) {
logger.error(e);
}
if (AutoClientEnd.oldNotification != AutoClientEnd.notification) {
AutoClientEnd.oldNotification = AutoClientEnd.notification;
callHandler();
}
}
@Override
public void onClose(int code, String reason, boolean remote) {
logger.info("AutoClientEnd disconnected from: " + getURI() + "; Code: " + code + ", reason : " + reason);
AutoClientEnd.restartNeeded = true;
}
@Override
public void onError(Exception ex) {
logger.error("XACMLErrorConstants.ERROR_PROCESS_FLOW + Error connecting to: " + getURI()
+ ", Exception occured ...\n" + ex);
AutoClientEnd.restartNeeded = true;
}
@Override
public void onOpen(ServerHandshake arg0) {
restartNeeded = false;
logger.info("Auto Notification Session Started... " + getURI());
}
private static void restart() {
try {
if (client != null && restartNeeded && !stop) {
logger.info("Auto Notification Session Restarting ... " + getUrl());
client.reconnect();
}
} catch (Exception e) {
logger.info("Auto Notification Session Error Started... " + getUrl());
}
}
/**
* Sets the auto.
*
* @param scheme the scheme
* @param handler the handler
*/
public static void setAuto(NotificationScheme scheme, NotificationHandler handler) {
logger.info("Auto Notification setAuto, scheme: " + scheme);
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;
}
/**
* Start.
*
* @param url the url
*/
public static void start(String url) {
AutoClientEnd.url = url;
if (scheme == null || handler == null || !(scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS)
|| scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) || AutoClientEnd.client != null) {
return;
}
if (url.contains("https")) {
url = url.replaceAll("https", "wss");
} else {
url = url.replaceAll("http", "ws");
}
// Stop and Start needs to be done.
try {
logger.info("Starting Auto Notification with the PDP server : " + url);
client = new AutoClientEnd(new URI(url + "notifications"));
client.setConnectionLostTimeout(0);
client.connect();
status = true;
restartExecutorService = Executors.newSingleThreadScheduledExecutor();
Runnable task = AutoClientEnd::restart;
restartExecutorService.scheduleAtFixedRate(task, 60, 60, TimeUnit.SECONDS);
if (error) {
// will not trigger. leave it in to later add checks
// 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 && oldNotification != notification) {
oldNotification = notification;
AutoClientEnd.notification = notification;
callHandler();
}
error = false;
}
} catch (Exception e) {
logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + e);
status = false;
changeUrl();
}
}
private static void changeUrl() {
// Change the PDP if it is not Up.
stop();
StdPolicyEngine.rotatePDPList();
start(StdPolicyEngine.getPDPURL());
}
/**
* Stop the websocket connection.
*/
public static void stop() {
if (client == null) {
return;
}
logger.info("\n Closing Auto Notification WebSocket Connection.. ");
stop = true;
// first stop the restart service
try {
restartExecutorService.shutdown();
} catch (Exception e1) {
logger.info("\n AutoClientEnd: Error stoppping the restart Scheduler ");
}
// close the connection
try {
client.closeBlocking();
} catch (Exception e) {
logger.error("\n ERROR Closing Auto Notification WebSocket Connection.. ");
}
logger.info("\n Closed the Auto Notification WebSocket Connection.. ");
client = null;
status = false;
stop = false;
restartNeeded = false;
}
private static void callHandler() {
logger.info("AutoClientEnd: In callHandler");
if (handler == null || scheme == null) {
return;
}
if (scheme.equals(NotificationScheme.AUTO_ALL_NOTIFICATIONS)) {
boolean removed = false;
boolean updated = false;
if (notification.getRemovedPolicies() != null && !notification.getRemovedPolicies().isEmpty()) {
removed = true;
notification.setNotificationType(NotificationType.REMOVE);
}
if (notification.getLoadedPolicies() != null && !notification.getLoadedPolicies().isEmpty()) {
updated = true;
notification.setNotificationType(NotificationType.UPDATE);
}
if (removed && updated) {
notification.setNotificationType(NotificationType.BOTH);
}
try {
handler.notificationReceived(notification);
} catch (Exception e) {
logger.error("Error in Clients Handler Object : ", e);
}
} else if (scheme.equals(NotificationScheme.AUTO_NOTIFICATIONS)) {
PDPNotification newNotification = MatchStore.checkMatch(notification);
if (newNotification.getNotificationType() != null) {
try {
handler.notificationReceived(newNotification);
} catch (Exception e) {
logger.error("Error in Clients Handler Object : ", e);
}
}
}
}
}
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