From d9662ed189a8176fd625dc6d9d3269b5c4954e54 Mon Sep 17 00:00:00 2001
From: Pierre HUBERT <pierre.git@communiquons.org>
Date: Thu, 15 Apr 2021 09:15:11 +0200
Subject: [PATCH] Create WebSocket connection

---
 .../NotificationsService.java                 | 104 +++++++++++++++++-
 1 file changed, 100 insertions(+), 4 deletions(-)

diff --git a/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java b/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java
index 92f512e..e9d7d0c 100644
--- a/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java
+++ b/android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsService.java
@@ -17,16 +17,33 @@ import androidx.annotation.Nullable;
 import androidx.core.app.NotificationCompat;
 import androidx.core.content.ContextCompat;
 
+import com.neovisionaries.ws.client.WebSocket;
+import com.neovisionaries.ws.client.WebSocketAdapter;
+import com.neovisionaries.ws.client.WebSocketException;
+import com.neovisionaries.ws.client.WebSocketFactory;
+import com.neovisionaries.ws.client.WebSocketFrame;
+
 import org.communiquons.comunic.MainActivity;
 import org.communiquons.comunic.R;
 
-public class NotificationsService extends Service {
+import java.util.List;
+import java.util.Map;
+
+public class NotificationsService extends Service implements Runnable {
     private static final String TAG = NotificationsService.class.getSimpleName();
 
     public static final String CHANNEL_ID = "IndependentPushServiceChannel";
     private static final String INDEPENDENT_PUSH_NOTIFICATIONS_SERVICE = "independent-push-notifications-service";
     private static final String WS_URL_PREF_KEY = "ws_url";
 
+    private static final int CONNECT_TIMEOUT = 1000;
+    private static final int RECONNECT_INTERVAL = 10000;
+    private static final int PING_INTERVAL = 15000;
+
+    private Thread thread;
+    private boolean stop = false;
+    private final Object lock = new Object();
+
     public static void configure(@NonNull String wsURL, @NonNull Context context) {
         SharedPreferences prefs = context.getSharedPreferences(INDEPENDENT_PUSH_NOTIFICATIONS_SERVICE, MODE_PRIVATE);
 
@@ -54,10 +71,12 @@ public class NotificationsService extends Service {
         SharedPreferences prefs = context.getSharedPreferences(INDEPENDENT_PUSH_NOTIFICATIONS_SERVICE, MODE_PRIVATE);
 
         if (!prefs.contains(WS_URL_PREF_KEY)) {
-            System.err.println("Independent push notifications service not configured ! Skipping!");
+            Log.v(TAG, "Independent push notifications service not configured ! Skipping!");
             return;
         }
 
+        Log.v(TAG, "Start independent push notifications service...");
+
         Intent intent = new Intent(context, NotificationsService.class);
         ContextCompat.startForegroundService(context, intent);
     }
@@ -104,13 +123,90 @@ public class NotificationsService extends Service {
     public void onDestroy() {
         Log.v(TAG, "Destroying service");
         super.onDestroy();
+
+        if (thread != null) {
+            thread.interrupt();
+            stop = true;
+        }
     }
 
     private void initService() {
+        thread = new Thread(this);
+        thread.start();
+    }
+
+    @Override
+    public void run() {
+        try {
+            while (!stop) {
+                try {
+                    connect();
+                } catch (InterruptedException e) {
+                    Log.e(TAG, "Thread interrupted!");
+                    return;
+                } catch (Exception e) {
+                    Log.e(TAG, "Failed to connect to push notifications service!");
+                    e.printStackTrace();
+                }
+
+
+                // Wait attempting new connection
+                // noinspection BusyWait
+                Thread.sleep(RECONNECT_INTERVAL * 1000);
+            }
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            Log.e(TAG, "Stop thread");
+        }
+    }
+
+    private void connect() throws Exception {
         String url = getSharedPreferences(INDEPENDENT_PUSH_NOTIFICATIONS_SERVICE, MODE_PRIVATE)
                 .getString(WS_URL_PREF_KEY, null);
 
-        System.out.println("START HEAVY WORK HERE !!!!");
-        System.out.println("Connect to " + url);
+        Log.v(TAG, "Connect to " + url);
+
+        WebSocket ws = new WebSocketFactory().createSocket(url, CONNECT_TIMEOUT);
+        ws.setPingInterval(PING_INTERVAL);
+        ws.addListener(new WebSocketAdapter() {
+            @Override
+            public void onConnected(WebSocket websocket, Map<String, List<String>> headers) throws Exception {
+                Log.v(TAG, "Connected to independent push notifications service!");
+            }
+
+            @Override
+            public void onDisconnected(WebSocket websocket, WebSocketFrame serverCloseFrame, WebSocketFrame clientCloseFrame, boolean closedByServer) throws Exception {
+                Log.v(TAG, "Disconnect from independent push notifications websocket!");
+                lock.notify();
+            }
+
+            @Override
+            public void onTextFrame(WebSocket websocket, WebSocketFrame frame) throws Exception {
+                handleTextFrame(frame);
+            }
+
+            @Override
+            public void onError(WebSocket websocket, WebSocketException cause) throws Exception {
+                Log.e(TAG, "An error occured, closing WebSocket!");
+                cause.printStackTrace();
+                websocket.disconnect();
+            }
+        });
+
+        ws.connect();
+
+
+        // wait for connection to complete
+        synchronized (lock) {
+            lock.wait();
+        }
+    }
+
+    private void handleTextFrame(WebSocketFrame frame) {
+        if (!frame.isTextFrame())
+            return;
+
+        Log.v(TAG, "Got text frame!");
+        Log.v(TAG, frame.getPayloadText());
     }
 }