implement stream-notify-user (subscriptions-changed)

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

@@ -215,7 +215,7 @@ public class MethodCallHelper {
   /**
    * request "subscriptions/get".
    */
-  public Task<Void> getRooms() {
+  public Task<Void> getRoomSubscriptions() {
     return call("subscriptions/get", TIMEOUT_MS).onSuccessTask(CONVERT_TO_JSON_ARRAY)
         .onSuccessTask(task -> {
           final JSONArray result = task.getResult();

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainFragment.java

@@ -67,7 +67,7 @@ public class SidebarMainFragment extends AbstractFragment {
             .setOnUpdateListener(list -> roomListManager.setRooms(list));
 
         currentUserObserver = realmHelper
-            .createObjectObserver(realm -> realm.where(User.class).isNotEmpty("emails"))
+            .createObjectObserver(User::queryCurrentUser)
             .setOnUpdateListener(this::onRenderCurrentUser);
 
         methodCallHelper = new MethodCallHelper(getContext(), serverConfigId);

app/src/main/java/chat/rocket/android/model/ddp/User.java

 package chat.rocket.android.model.ddp;
 
+import io.realm.Realm;
 import io.realm.RealmList;
 import io.realm.RealmObject;
+import io.realm.RealmQuery;
 import io.realm.annotations.PrimaryKey;
 
 /**
@@ -60,4 +62,8 @@ public class User extends RealmObject {
   public void setEmails(RealmList<Email> emails) {
     this.emails = emails;
   }
+
+  public static RealmQuery<User> queryCurrentUser(Realm realm) {
+    return realm.where(User.class).isNotEmpty("emails");
+  }
 }

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

@@ -13,9 +13,10 @@ import chat.rocket.android.model.ServerConfig;
 import chat.rocket.android.model.internal.Session;
 import chat.rocket.android.realm_helper.RealmHelper;
 import chat.rocket.android.realm_helper.RealmStore;
-import chat.rocket.android.service.ddp.ActiveUsersSubscriber;
-import chat.rocket.android.service.ddp.LoginServiceConfigurationSubscriber;
-import chat.rocket.android.service.ddp.UserDataSubscriber;
+import chat.rocket.android.service.ddp.base.ActiveUsersSubscriber;
+import chat.rocket.android.service.ddp.base.LoginServiceConfigurationSubscriber;
+import chat.rocket.android.service.ddp.base.UserDataSubscriber;
+import chat.rocket.android.service.observer.CurrentUserObserver;
 import chat.rocket.android.service.observer.GetUsersOfRoomsProcedureObserver;
 import chat.rocket.android.service.observer.LoadMessageProcedureObserver;
 import chat.rocket.android.service.observer.MethodCallObserver;
@@ -43,7 +44,8 @@ public class RocketChatWebSocketThread extends HandlerThread {
       SessionObserver.class,
       LoadMessageProcedureObserver.class,
       GetUsersOfRoomsProcedureObserver.class,
-      NewMessageObserver.class
+      NewMessageObserver.class,
+      CurrentUserObserver.class
   };
   private final Context appContext;
   private final String serverConfigId;

app/src/main/java/chat/rocket/android/service/ddp/AbstractDDPDocEventSubscriber.java

@@ -2,20 +2,21 @@ package chat.rocket.android.service.ddp;
 
 import android.content.Context;
 import android.text.TextUtils;
+import chat.rocket.android.api.DDPClientWraper;
 import chat.rocket.android.helper.LogcatIfError;
 import chat.rocket.android.realm_helper.RealmHelper;
 import chat.rocket.android.service.Registerable;
-import chat.rocket.android.api.DDPClientWraper;
 import chat.rocket.android_ddp.DDPSubscription;
 import io.realm.Realm;
 import io.realm.RealmObject;
 import java.util.Iterator;
+import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import rx.Subscription;
 import timber.log.Timber;
 
-abstract class AbstractDDPDocEventSubscriber implements Registerable {
+public abstract class AbstractDDPDocEventSubscriber implements Registerable {
   protected final Context context;
   protected final RealmHelper realmHelper;
   protected final DDPClientWraper ddpClient;
@@ -31,7 +32,13 @@ abstract class AbstractDDPDocEventSubscriber implements Registerable {
 
   protected abstract String getSubscriptionName();
 
-  protected abstract String getSubscriptionCallbackName();
+  protected abstract JSONArray getSubscriptionParams() throws JSONException;
+
+  protected boolean shouldTruncateTableOnInitialize() {
+    return false;
+  }
+
+  protected abstract boolean isTarget(String callbackName);
 
   protected abstract Class<? extends RealmObject> getModelClass();
 
@@ -39,8 +46,15 @@ abstract class AbstractDDPDocEventSubscriber implements Registerable {
     return json;
   }
 
-  @Override public void register() {
-    ddpClient.subscribe(getSubscriptionName(), null).onSuccess(task -> {
+  @Override public final void register() {
+    JSONArray params = null;
+    try {
+      params = getSubscriptionParams();
+    } catch (JSONException exception) {
+      // just ignore.
+    }
+
+    ddpClient.subscribe(getSubscriptionName(), params).onSuccess(task -> {
       subscriptionId = task.getResult().id;
       return null;
     }).continueWith(task -> {
@@ -50,20 +64,24 @@ abstract class AbstractDDPDocEventSubscriber implements Registerable {
       return null;
     });
 
-    realmHelper.executeTransaction(realm -> {
-      realm.delete(getModelClass());
-      return null;
-    }).onSuccess(task -> {
-      registerSubscriptionCallback();
-      return null;
-    }).continueWith(new LogcatIfError());
+    if (shouldTruncateTableOnInitialize()) {
+      realmHelper.executeTransaction(realm -> {
+        realm.delete(getModelClass());
+        return null;
+      }).onSuccess(task -> {
+        rxSubscription = subscribe();
+        return null;
+      }).continueWith(new LogcatIfError());
+    } else {
+      rxSubscription = subscribe();
+    }
   }
 
-  private void registerSubscriptionCallback() {
-    rxSubscription = ddpClient.getSubscriptionCallback()
+  protected Subscription subscribe() {
+    return ddpClient.getSubscriptionCallback()
         .filter(event -> event instanceof DDPSubscription.DocEvent)
         .cast(DDPSubscription.DocEvent.class)
-        .filter(event -> getSubscriptionCallbackName().equals(event.collection))
+        .filter(event -> isTarget(event.collection))
         .subscribe(docEvent -> {
           try {
             if (docEvent instanceof DDPSubscription.Added.Before) {
@@ -139,7 +157,7 @@ abstract class AbstractDDPDocEventSubscriber implements Registerable {
     }
   }
 
-  @Override public void unregister() {
+  @Override public final void unregister() {
     if (rxSubscription != null) {
       rxSubscription.unsubscribe();
     }

app/src/main/java/chat/rocket/android/service/ddp/base/AbstractBaseSubscriber.java

+package chat.rocket.android.service.ddp.base;
+
+import android.content.Context;
+import chat.rocket.android.api.DDPClientWraper;
+import chat.rocket.android.realm_helper.RealmHelper;
+import chat.rocket.android.service.ddp.AbstractDDPDocEventSubscriber;
+import org.json.JSONArray;
+
+abstract class AbstractBaseSubscriber extends AbstractDDPDocEventSubscriber {
+  protected AbstractBaseSubscriber(Context context, RealmHelper realmHelper,
+      DDPClientWraper ddpClient) {
+    super(context, realmHelper, ddpClient);
+  }
+
+  @Override protected final JSONArray getSubscriptionParams() {
+    return null;
+  }
+
+  @Override protected final boolean shouldTruncateTableOnInitialize() {
+    return true;
+  }
+
+  protected abstract String getSubscriptionCallbackName();
+
+  @Override protected final boolean isTarget(String callbackName) {
+    return getSubscriptionCallbackName().equals(callbackName);
+  }
+}

app/src/main/java/chat/rocket/android/service/ddp/ActiveUsersSubscriber.java → app/src/main/java/chat/rocket/android/service/ddp/base/ActiveUsersSubscriber.java

-package chat.rocket.android.service.ddp;
+package chat.rocket.android.service.ddp.base;
 
 import android.content.Context;
 import chat.rocket.android.model.ddp.User;
@@ -9,7 +9,7 @@ import io.realm.RealmObject;
 /**
  * "activeUsers" subscriber.
  */
-public class ActiveUsersSubscriber extends AbstractDDPDocEventSubscriber {
+public class ActiveUsersSubscriber extends AbstractBaseSubscriber {
   public ActiveUsersSubscriber(Context context, RealmHelper realmHelper,
       DDPClientWraper ddpClient) {
     super(context, realmHelper, ddpClient);

app/src/main/java/chat/rocket/android/service/ddp/LoginServiceConfigurationSubscriber.java → app/src/main/java/chat/rocket/android/service/ddp/base/LoginServiceConfigurationSubscriber.java

-package chat.rocket.android.service.ddp;
+package chat.rocket.android.service.ddp.base;
 
 import android.content.Context;
 import chat.rocket.android.model.ddp.MeteorLoginServiceConfiguration;
@@ -9,7 +9,7 @@ import io.realm.RealmObject;
 /**
  * meteor.loginServiceConfiguration subscriber
  */
-public class LoginServiceConfigurationSubscriber extends AbstractDDPDocEventSubscriber {
+public class LoginServiceConfigurationSubscriber extends AbstractBaseSubscriber {
   public LoginServiceConfigurationSubscriber(Context context, RealmHelper realmHelper,
       DDPClientWraper ddpClient) {
     super(context, realmHelper, ddpClient);

app/src/main/java/chat/rocket/android/service/ddp/UserDataSubscriber.java → app/src/main/java/chat/rocket/android/service/ddp/base/UserDataSubscriber.java

-package chat.rocket.android.service.ddp;
+package chat.rocket.android.service.ddp.base;
 
 import android.content.Context;
 import chat.rocket.android.api.DDPClientWraper;
@@ -9,7 +9,7 @@ import io.realm.RealmObject;
 /**
  * "userData" subscriber.
  */
-public class UserDataSubscriber extends AbstractDDPDocEventSubscriber {
+public class UserDataSubscriber extends AbstractBaseSubscriber {
   public UserDataSubscriber(Context context, RealmHelper realmHelper,
       DDPClientWraper ddpClient) {
     super(context, realmHelper, ddpClient);

app/src/main/java/chat/rocket/android/service/ddp/stream/AbstractStreamNotifyEventSubscriber.java

+package chat.rocket.android.service.ddp.stream;
+
+import android.content.Context;
+import chat.rocket.android.api.DDPClientWraper;
+import chat.rocket.android.helper.LogcatIfError;
+import chat.rocket.android.realm_helper.RealmHelper;
+import chat.rocket.android.service.ddp.AbstractDDPDocEventSubscriber;
+import chat.rocket.android_ddp.DDPSubscription;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import timber.log.Timber;
+
+abstract class AbstractStreamNotifyEventSubscriber extends AbstractDDPDocEventSubscriber {
+  protected AbstractStreamNotifyEventSubscriber(Context context, RealmHelper realmHelper,
+      DDPClientWraper ddpClient) {
+    super(context, realmHelper, ddpClient);
+  }
+
+  @Override protected final boolean shouldTruncateTableOnInitialize() {
+    return false;
+  }
+
+  @Override protected final boolean isTarget(String callbackName) {
+    return getSubscriptionName().equals(callbackName);
+  }
+
+  protected abstract String getPrimaryKeyForModel();
+
+  @Override protected void onDocumentChanged(DDPSubscription.Changed docEvent) {
+    try {
+      JSONArray args = docEvent.fields.getJSONArray("args");
+      String msg = args.getString(0);
+      JSONObject target = args.getJSONObject(1);
+      if ("removed".equals(msg)) {
+        realmHelper.executeTransaction(realm ->
+            realm.where(getModelClass())
+                .equalTo(getPrimaryKeyForModel(), target.getString(getPrimaryKeyForModel()))
+                .findAll().deleteAllFromRealm()
+        ).continueWith(new LogcatIfError());
+      } else { //inserted, updated
+        realmHelper.executeTransaction(realm ->
+            realm.createOrUpdateObjectFromJson(getModelClass(), customizeFieldJson(target))
+        ).continueWith(new LogcatIfError());
+      }
+    } catch (Exception exception) {
+      Timber.w(exception, "failed to save stream-notify event.");
+    }
+  }
+}

app/src/main/java/chat/rocket/android/service/ddp/stream/StreamNotifyUserSubscriptionsChanged.java

+package chat.rocket.android.service.ddp.stream;
+
+import android.content.Context;
+import chat.rocket.android.api.DDPClientWraper;
+import chat.rocket.android.model.ddp.RoomSubscription;
+import chat.rocket.android.realm_helper.RealmHelper;
+import io.realm.RealmObject;
+import org.json.JSONArray;
+import org.json.JSONException;
+
+public class StreamNotifyUserSubscriptionsChanged extends AbstractStreamNotifyEventSubscriber {
+  private final String userId;
+
+  public StreamNotifyUserSubscriptionsChanged(Context context, RealmHelper realmHelper,
+      DDPClientWraper ddpClient, String userId) {
+    super(context, realmHelper, ddpClient);
+    this.userId = userId;
+  }
+
+  @Override protected String getSubscriptionName() {
+    return "stream-notify-user";
+  }
+
+  @Override protected JSONArray getSubscriptionParams() throws JSONException {
+    return new JSONArray()
+        .put(userId + "/subscriptions-changed")
+        .put(false);
+  }
+
+  @Override protected Class<? extends RealmObject> getModelClass() {
+    return RoomSubscription.class;
+  }
+
+  @Override protected String getPrimaryKeyForModel() {
+    return "rid";
+  }
+}

app/src/main/java/chat/rocket/android/service/observer/CurrentUserObserver.java

+package chat.rocket.android.service.observer;
+
+import android.content.Context;
+import chat.rocket.android.api.DDPClientWraper;
+import chat.rocket.android.api.MethodCallHelper;
+import chat.rocket.android.model.ddp.User;
+import chat.rocket.android.realm_helper.RealmHelper;
+import chat.rocket.android.service.Registerable;
+import chat.rocket.android.service.ddp.stream.StreamNotifyUserSubscriptionsChanged;
+import hugo.weaving.DebugLog;
+import io.realm.Realm;
+import io.realm.RealmResults;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * observe the user with emails.
+ */
+public class CurrentUserObserver extends AbstractModelObserver<User> {
+  private boolean currentUserExists;
+  private final MethodCallHelper methodCall;
+
+
+  private ArrayList<Registerable> listeners;
+
+  public CurrentUserObserver(Context context, RealmHelper realmHelper,
+      DDPClientWraper ddpClient) {
+    super(context, realmHelper, ddpClient);
+    methodCall = new MethodCallHelper(realmHelper, ddpClient);
+    currentUserExists = false;
+  }
+
+  @Override public RealmResults<User> queryItems(Realm realm) {
+    return User.queryCurrentUser(realm).findAll();
+  }
+
+  @Override public void onUpdateResults(List<User> results) {
+    boolean exists = !results.isEmpty();
+
+    if (currentUserExists != exists) {
+      if (exists) {
+        onLogin(results.get(0));
+      } else {
+        onLogout();
+      }
+      currentUserExists = exists;
+    }
+  }
+
+  @DebugLog
+  private void onLogin(User user) {
+    if (listeners != null) {
+      onLogout();
+    }
+    listeners = new ArrayList<>();
+
+    final String userId = user.get_id();
+
+    // get and observe Room subscriptions.
+    methodCall.getRoomSubscriptions().onSuccess(task -> {
+      Registerable listener = new StreamNotifyUserSubscriptionsChanged(
+          context, realmHelper, ddpClient, userId);
+      listener.register();
+      listeners.add(listener);
+      return null;
+    });
+  }
+
+  @DebugLog
+  private void onLogout() {
+    if (listeners != null) {
+      for (Registerable listener : listeners) {
+        listener.unregister();
+      }
+    }
+    listeners = null;
+  }
+}

app/src/main/java/chat/rocket/android/service/observer/SessionObserver.java

@@ -2,8 +2,8 @@ package chat.rocket.android.service.observer;
 
 import android.content.Context;
 import chat.rocket.android.api.DDPClientWraper;
-import chat.rocket.android.api.MethodCallHelper;
 import chat.rocket.android.helper.LogcatIfError;
+import chat.rocket.android.model.internal.GetUsersOfRoomsProcedure;
 import chat.rocket.android.model.internal.LoadMessageProcedure;
 import chat.rocket.android.model.internal.MethodCall;
 import chat.rocket.android.model.internal.Session;
@@ -17,7 +17,6 @@ import java.util.List;
  * Observes user is logged into server.
  */
 public class SessionObserver extends AbstractModelObserver<Session> {
-  private final MethodCallHelper methodCall;
   private int count;
 
   /**
@@ -25,7 +24,6 @@ public class SessionObserver extends AbstractModelObserver<Session> {
    */
   public SessionObserver(Context context, RealmHelper realmHelper, DDPClientWraper ddpClient) {
     super(context, realmHelper, ddpClient);
-    methodCall = new MethodCallHelper(realmHelper, ddpClient);
     count = 0;
   }
 
@@ -57,7 +55,6 @@ public class SessionObserver extends AbstractModelObserver<Session> {
   }
 
   @DebugLog private void onLogin() {
-    methodCall.getRooms().continueWith(new LogcatIfError());
 
   }
 
@@ -66,6 +63,7 @@ public class SessionObserver extends AbstractModelObserver<Session> {
       // remove all tables. ONLY INTERNAL TABLES!.
       realm.delete(MethodCall.class);
       realm.delete(LoadMessageProcedure.class);
+      realm.delete(GetUsersOfRoomsProcedure.class);
       return null;
     }).continueWith(new LogcatIfError());
   }