Add isonline parameter to connection

Quotient/connection.cpp

@@ -433,16 +433,22 @@ void Connection::sync(int timeout)
     connect(job, &SyncJob::success, this, [this, job] {
         onSyncSuccess(job->takeData());
         d->syncJob = nullptr;
+        d->lastSyncSuccessful = true;
+        emit isOnlineChanged();
         emit syncDone();
     });
     connect(job, &SyncJob::retryScheduled, this,
             [this, job](int retriesTaken, int nextInMilliseconds) {
+                d->lastSyncSuccessful = false;
+                emit isOnlineChanged();
                 emit networkError(job->errorString(), job->rawDataSample(),
                                   retriesTaken, nextInMilliseconds);
             });
     connect(job, &SyncJob::failure, this, [this, job] {
         // SyncJob persists with retries on transient errors; if it fails,
         // there's likely something serious enough to stop the loop.
+        d->lastSyncSuccessful = false;
+        emit isOnlineChanged();
         stopSync();
         if (job->error() == BaseJob::Unauthorised) {
             qCWarning(SYNCJOB)
@@ -1099,6 +1105,8 @@ QByteArray Connection::accessToken() const
 
 bool Connection::isLoggedIn() const { return !accessToken().isEmpty(); }
 
+bool Connection::isOnline() const { return d->lastSyncSuccessful; }
+
 QOlmAccount* Connection::olmAccount() const
 {
     return d->encryptionData ? &d->encryptionData->olmAccount : nullptr;

Quotient/connection.h

@@ -120,6 +120,7 @@ class QUOTIENT_API Connection : public QObject {
     Q_PROPERTY(QString deviceId READ deviceId NOTIFY stateChanged)
     Q_PROPERTY(QByteArray accessToken READ accessToken NOTIFY stateChanged)
     Q_PROPERTY(bool isLoggedIn READ isLoggedIn NOTIFY stateChanged STORED false)
+    Q_PROPERTY(bool isOnline READ isOnline NOTIFY isOnlineChanged)
     Q_PROPERTY(QString defaultRoomVersion READ defaultRoomVersion NOTIFY capabilitiesLoaded)
     Q_PROPERTY(QUrl homeserver READ homeserver WRITE setHomeserver NOTIFY homeserverChanged)
     Q_PROPERTY(QVector<GetLoginFlowsJob::LoginFlow> loginFlows READ loginFlows NOTIFY loginFlowsChanged)
@@ -332,6 +333,11 @@ class QUOTIENT_API Connection : public QObject {
     QString deviceId() const;
     QByteArray accessToken() const;
     bool isLoggedIn() const;
+
+    //! \brief Whether the connection is successfully syncing with the server.
+    //!
+    //! \return true, if the last sync was successful, false otherwise.
+    bool isOnline() const;
     QOlmAccount* olmAccount() const;
     Database* database() const;
 
@@ -787,6 +793,10 @@ public Q_SLOTS:
     //! accessToken - these properties normally only change at
     //! a successful login and logout and are constant at other times.
     void stateChanged();
+
+    //! The online state has changed.
+    void isOnlineChanged();
+
     void loginError(QString message, QString details);
 
     //! \brief A network request (job) started by callApi() has failed

Quotient/connection_p.h

@@ -67,6 +67,7 @@ class Q_DECL_HIDDEN Quotient::Connection::Private {
     JobHandle<GetLoginFlowsJob> loginFlowsJob = nullptr;
 
     SyncJob* syncJob = nullptr;
+    bool lastSyncSuccessful = true;
     JobHandle<LogoutJob> logoutJob = nullptr;
 
     bool cacheState = true;