fix keepalive.

app/src/main/java/chat/rocket/android/api/MethodCallHelper.java

@@ -112,6 +112,7 @@ public class MethodCallHelper {
             .put("sessionId", Session.DEFAULT_ID)
             .put("token", task.getResult())
             .put("tokenVerified", true)
+            .put("error", JSONObject.NULL)
         ));
   }
 

app/src/main/java/chat/rocket/android/service/RocketChatService.java

@@ -13,9 +13,7 @@ import chat.rocket.android.realm_helper.RealmListObserver;
 import chat.rocket.android.realm_helper.RealmStore;
 import io.realm.RealmResults;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
-import java.util.Map;
 
 /**
  * Background service for Rocket.Chat.Application class.
@@ -42,7 +40,7 @@ public class RocketChatService extends Service {
                 .isNotNull("hostname")
                 .equalTo("state", ServerConfig.STATE_READY)
                 .findAll())
-            .setOnUpdateListener(this::syncWebSocketThreadsWith);
+            .setOnUpdateListener(this::connectToServerWithServerConfig);
 
     refreshServerConfigState();
   }
@@ -51,17 +49,37 @@ public class RocketChatService extends Service {
     realmHelper.executeTransaction(realm -> {
       RealmResults<ServerConfig> configs = realm.where(ServerConfig.class).findAll();
       for (ServerConfig config: configs) {
+        if (config.getState() != ServerConfig.STATE_READY) {
           config.setState(ServerConfig.STATE_READY);
         }
+      }
       return null;
     }).continueWith(new LogcatIfError());;
   }
 
   @Override public int onStartCommand(Intent intent, int flags, int startId) {
+    List<ServerConfig> configs = realmHelper.executeTransactionForReadResults(realm ->
+        realm.where(ServerConfig.class)
+            .equalTo("state", ServerConfig.STATE_CONNECTED)
+            .findAll());
+    for (ServerConfig config: configs) {
+      String serverConfigId = config.getServerConfigId();
+      if (webSocketThreads.containsKey(serverConfigId)) {
+        RocketChatWebSocketThread thread = webSocketThreads.get(serverConfigId);
+        if (thread != null) {
+          thread.keepalive();
+        }
+      }
+    }
+
     realmHelper.executeTransaction(realm -> {
       RealmResults<ServerConfig> targetConfigs = realm
           .where(ServerConfig.class)
+          .beginGroup()
           .equalTo("state", ServerConfig.STATE_CONNECTION_ERROR)
+          .or()
+          .isNotNull("error")
+          .endGroup()
           .isNotNull("session")
           .findAll();
       for (ServerConfig config : targetConfigs) {
@@ -76,31 +94,13 @@ public class RocketChatService extends Service {
     return START_STICKY;
   }
 
-  private void syncWebSocketThreadsWith(List<ServerConfig> configList) {
-    final Iterator<Map.Entry<String, RocketChatWebSocketThread>> iterator =
-        webSocketThreads.entrySet().iterator();
-
-    while (iterator.hasNext()) {
-      Map.Entry<String, RocketChatWebSocketThread> entry = iterator.next();
-      String serverConfigId = entry.getKey();
-      boolean found = false;
-      for (ServerConfig config : configList) {
-        if (serverConfigId.equals(config.getServerConfigId())) {
-          found = true;
-          break;
-        }
-      }
-      if (!found) {
-        RocketChatWebSocketThread thread = entry.getValue();
-        if (thread != null) {
-          RocketChatWebSocketThread.destroy(thread);
-        }
-        iterator.remove();
-      }
+  private void connectToServerWithServerConfig(List<ServerConfig> configList) {
+    if (configList.isEmpty()) {
+      return;
     }
 
-    for (ServerConfig config : configList) {
-      findOrCreateWebSocketThread(config).onSuccess(task -> {
+    ServerConfig config = configList.get(0);
+    createWebSocketThread(config).onSuccess(task -> {
       RocketChatWebSocketThread thread = task.getResult();
       if (thread != null) {
         thread.keepalive();
@@ -108,19 +108,13 @@ public class RocketChatService extends Service {
       return null;
     });
   }
-  }
 
-  private Task<RocketChatWebSocketThread> findOrCreateWebSocketThread(final ServerConfig config) {
+  private Task<RocketChatWebSocketThread> createWebSocketThread(final ServerConfig config) {
     final String serverConfigId = config.getServerConfigId();
-    if (webSocketThreads.containsKey(serverConfigId)) {
-      return ServerConfig.updateState(serverConfigId, ServerConfig.STATE_CONNECTED)
-          .onSuccessTask(_task -> Task.forResult(webSocketThreads.get(serverConfigId)));
-    } else {
-      return ServerConfig.updateState(serverConfigId, ServerConfig.STATE_CONNECTING)
-          .onSuccessTask(_task -> {
     webSocketThreads.put(serverConfigId, null);
-            return RocketChatWebSocketThread.getStarted(getApplicationContext(), config);
-          })
+    return ServerConfig.updateState(serverConfigId, ServerConfig.STATE_CONNECTING)
+        .onSuccessTask(_task ->
+            RocketChatWebSocketThread.getStarted(getApplicationContext(), config))
         .onSuccessTask(task ->
             ServerConfig.updateState(serverConfigId, ServerConfig.STATE_CONNECTED)
                 .onSuccessTask(_task -> task))
@@ -129,6 +123,14 @@ public class RocketChatService extends Service {
           return task;
         });
   }
+
+  private Task<RocketChatWebSocketThread> findOrCreateWebSocketThread(final ServerConfig config) {
+    final String serverConfigId = config.getServerConfigId();
+    if (webSocketThreads.containsKey(serverConfigId)) {
+      return Task.forResult(webSocketThreads.get(serverConfigId));
+    } else {
+      return createWebSocketThread(config);
+    }
   }
 
   @Nullable

app/src/main/java/chat/rocket/android/service/RocketChatWebSocketThread.java

@@ -45,7 +45,6 @@ public class RocketChatWebSocketThread extends HandlerThread {
   private final RealmHelper serverConfigRealm;
   private final ArrayList<Registerable> listeners = new ArrayList<>();
   private DDPClientWraper ddpClient;
-  private boolean socketExists;
   private boolean listenersRegistered;
 
   private RocketChatWebSocketThread(Context appContext, String serverConfigId) {
@@ -116,22 +115,24 @@ public class RocketChatWebSocketThread extends HandlerThread {
     }
   }
 
-  private Task<Void> ensureConnection() {
-    if (ddpClient == null || !ddpClient.isConnected()) {
-      return connect();
-    } else {
-      return Task.forResult(null);
-    }
-  }
-
   /**
    * synchronize the state of the thread with ServerConfig.
    */
   @DebugLog public void keepalive() {
-    ensureConnection().continueWith(task -> {
-      new Handler(getLooper()).post(this::keepaliveListeners);
+    if (ddpClient == null || !ddpClient.isConnected()) {
+      defaultRealm.executeTransaction(realm -> {
+        ServerConfig config = realm.where(ServerConfig.class)
+            .equalTo("serverConfigId", serverConfigId)
+            .findFirst();
+        if (config != null && config.getState() == ServerConfig.STATE_CONNECTED) {
+          config.setState(ServerConfig.STATE_READY);
+          quit();
+        }
         return null;
       });
+    } else {
+      new Handler(getLooper()).post(this::keepaliveListeners);
+    }
   }
 
   private void prepareWebSocket(String hostname) {
@@ -141,11 +142,6 @@ public class RocketChatWebSocketThread extends HandlerThread {
   }
 
   @DebugLog private Task<Void> connect() {
-    if (socketExists) {
-      return Task.forResult(null);
-    }
-    socketExists = true;
-
     final ServerConfig config = defaultRealm.executeTransactionForRead(realm ->
         realm.where(ServerConfig.class).equalTo("serverConfigId", serverConfigId).findFirst());
 
@@ -229,7 +225,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
 
   //@DebugLog
   private void keepaliveListeners() {
-    if (!socketExists || !listenersRegistered) {
+    if (!listenersRegistered) {
       return;
     }
 
@@ -240,7 +236,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
 
   @DebugLog
   private void unregisterListeners() {
-    if (!socketExists || !listenersRegistered) {
+    if (!listenersRegistered) {
       return;
     }
 
@@ -255,6 +251,5 @@ public class RocketChatWebSocketThread extends HandlerThread {
       ddpClient = null;
     }
     listenersRegistered = false;
-    socketExists = false;
   }
 }