From c5649915e6259e921cfd087042525b69533d53b0 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Thu, 12 Apr 2018 14:32:44 +0300
Subject: notifications: pushserver is the only websocket component for now

---
 .../java/com/juick/components/Notifications.java   | 88 ++++++++++++++++++++--
 1 file changed, 80 insertions(+), 8 deletions(-)

(limited to 'juick-notifications/src/main/java/com/juick/components/Notifications.java')

diff --git a/juick-notifications/src/main/java/com/juick/components/Notifications.java b/juick-notifications/src/main/java/com/juick/components/Notifications.java
index ce89de32..439c4bd7 100644
--- a/juick-notifications/src/main/java/com/juick/components/Notifications.java
+++ b/juick-notifications/src/main/java/com/juick/components/Notifications.java
@@ -22,6 +22,7 @@ import com.google.android.gcm.server.*;
 import com.juick.ExternalToken;
 import com.juick.User;
 import com.juick.formatters.PlainTextFormatter;
+import com.juick.server.component.DisconnectedEvent;
 import com.juick.util.MessageUtils;
 import com.turo.pushy.apns.ApnsClient;
 import com.turo.pushy.apns.PushNotificationResponse;
@@ -32,10 +33,20 @@ import org.apache.commons.text.StringEscapeUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 import org.springframework.web.client.RestTemplate;
+import org.springframework.web.socket.CloseStatus;
+import org.springframework.web.socket.PingMessage;
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.handler.TextWebSocketHandler;
 
 import javax.annotation.Nonnull;
 import javax.annotation.PostConstruct;
@@ -45,13 +56,14 @@ import java.io.IOException;
 import java.util.*;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
 
 /**
  * @author Ugnich Anton
  */
 @Component
-public class Notifications implements NotificationClientListener {
+public class Notifications extends TextWebSocketHandler implements NotificationClientListener {
     private static Logger logger = LoggerFactory.getLogger(Notifications.class);
 
     @Inject
@@ -76,6 +88,7 @@ public class Notifications implements NotificationClientListener {
     @PostConstruct
     public void init() throws IOException {
         mpnsClient.setListener(this);
+        closeFlag.set(false);
     }
     public void messageReceived(@Nonnull com.juick.Message jmsg) {
         User pmTo = jmsg.getTo();
@@ -202,13 +215,6 @@ public class Notifications implements NotificationClientListener {
         }
     }
 
-    @PreDestroy
-    public void close() throws Exception {
-        apns.close();
-
-        logger.info("ExternalComponent on notifications destroyed");
-    }
-
     public void addInvalidGCMToken(String token) {
         synchronized (invalidGCMTokens) {
             invalidGCMTokens.add(token);
@@ -252,4 +258,70 @@ public class Notifications implements NotificationClientListener {
     public Set<String> getInvalidAPNSTokens() {
         return invalidAPNSTokens;
     }
+    @Inject
+    private ApplicationEventPublisher applicationEventPublisher;
+
+    private WebSocketSession session;
+    private final AtomicBoolean closeFlag = new AtomicBoolean(false);
+
+    @Override
+    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
+        logger.info("WebSocket connected");
+        this.session = session;
+    }
+
+    @Override
+    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
+        logger.info("WebSocket disconnected with code {}: {}", status.getCode(), status.getReason());
+        applicationEventPublisher.publishEvent(new DisconnectedEvent(this));
+    }
+
+    @Override
+    protected void handleTextMessage(WebSocketSession session, TextMessage text) throws Exception {
+        com.juick.Message jmsg = jsonMapper.readValue(text.asBytes(), com.juick.Message.class);
+
+        if (logger.isInfoEnabled()) // prevent writeValueAsString execution if logger disabled
+            logger.info("got jmsg: {}", jsonMapper.writeValueAsString(jmsg));
+        if (!closeFlag.get()) {
+            messageReceived(jmsg);
+        }
+    }
+
+    @Scheduled(fixedRate = 30000, initialDelay = 30000)
+    public void ping() throws IOException {
+        if (session != null && session.isOpen()) {
+            logger.debug("Sending WebSocket ping");
+            session.sendMessage(new PingMessage());
+        } else if (!closeFlag.get()) {
+            applicationEventPublisher.publishEvent(new DisconnectedEvent(this));
+        }
+    }
+    @PreDestroy
+    public void close() {
+        apns.close();
+        closeFlag.set(true);
+    }
+    @Scheduled(fixedRate = 600000)
+    public void cleanupTokens() {
+        logger.debug("initializing GCM tokens cleanup: {} tokens", getInvalidGCMTokens().size());
+        deleteTokens("gcm", new ArrayList<>(getInvalidGCMTokens()));
+        cleanupGCMTokens();
+        logger.debug("initializing MPNS tokens cleanup: {} tokens", getInvalidMPNSTokens().size());
+        deleteTokens("mpns", new ArrayList<>(getInvalidMPNSTokens()));
+        cleanupMPNSTokens();
+        logger.debug("initializing APNS tokens cleanup: {} tokens", getInvalidAPNSTokens().size());
+        deleteTokens("apns", new ArrayList<>(getInvalidAPNSTokens()));
+        cleanupMPNSTokens();
+    }
+    private void deleteTokens(String type, List<String> devices) {
+        if (devices.size() > 0) {
+            List<ExternalToken> list = devices.stream()
+                    .map(d -> new ExternalToken(null, type, d, null)).collect(Collectors.toList());
+            HttpHeaders headers = new HttpHeaders();
+            headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
+            rest.exchange("http://api.juick.com/notifications",
+                    HttpMethod.DELETE, new HttpEntity<>(list, headers), new ParameterizedTypeReference<Void>() {
+                    });
+        }
+    }
 }
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