Save timeline messages in cache for faster startup times

deps/CMakeLists.txt

@@ -37,7 +37,7 @@ set(BOOST_SHA256
     5721818253e6a0989583192f96782c4a98eb6204965316df9f5ad75819225ca9)
 
 set(MATRIX_STRUCTS_URL https://github.com/mujx/matrix-structs)
-set(MATRIX_STRUCTS_TAG c24cb9b38312dfa24b33413847e3238600c678cd)
+set(MATRIX_STRUCTS_TAG 3a052a95c555ce3ae12b8a2e0508e8bb73266fa1)
 
 set(MTXCLIENT_URL https://github.com/mujx/mtxclient)
 set(MTXCLIENT_TAG 73491268f94ddeb606284836bb5f512d11b0e249)

include/Cache.h

@@ -19,8 +19,10 @@
 
 #include <boost/optional.hpp>
 
+#include <QDateTime>
 #include <QDir>
 #include <QImage>
+#include <QString>
 
 #include <json.hpp>
 #include <lmdb++.h>
@@ -46,9 +48,24 @@ struct SearchResult
         QString display_name;
 };
 
+inline int
+numeric_key_comparison(const MDB_val *a, const MDB_val *b)
+{
+        auto lhs = std::stoul(std::string((char *)a->mv_data, a->mv_size));
+        auto rhs = std::stoul(std::string((char *)b->mv_data, b->mv_size));
+
+        if (lhs < rhs)
+                return 1;
+        else if (lhs == rhs)
+                return 0;
+
+        return -1;
+}
+
 Q_DECLARE_METATYPE(SearchResult)
 Q_DECLARE_METATYPE(QVector<SearchResult>)
 Q_DECLARE_METATYPE(RoomMember)
+Q_DECLARE_METATYPE(mtx::responses::Timeline)
 
 //! Used to uniquely identify a list of read receipts.
 struct ReadReceiptKey
@@ -70,6 +87,15 @@ from_json(const json &j, ReadReceiptKey &key)
         key.room_id  = j.at("room_id").get<std::string>();
 }
 
+struct DescInfo
+{
+        QString username;
+        QString userid;
+        QString body;
+        QString timestamp;
+        QDateTime datetime;
+};
+
 //! UI info associated with a room.
 struct RoomInfo
 {
@@ -86,6 +112,8 @@ struct RoomInfo
         //! Who can access to the room.
         JoinRule join_rule = JoinRule::Public;
         bool guest_access  = false;
+        //! Metadata describing the last message in the timeline.
+        DescInfo msgInfo;
 };
 
 inline void
@@ -289,6 +317,8 @@ public:
         bool isFormatValid();
         void setCurrentFormat();
 
+        std::map<QString, mtx::responses::Timeline> roomMessages();
+
         //! Retrieve all the user ids from a room.
         std::vector<std::string> roomMembers(const std::string &room_id);
 
@@ -402,6 +432,13 @@ private:
         QString getInviteRoomTopic(lmdb::txn &txn, lmdb::dbi &statesdb);
         QString getInviteRoomAvatarUrl(lmdb::txn &txn, lmdb::dbi &statesdb, lmdb::dbi &membersdb);
 
+        DescInfo getLastMessageInfo(lmdb::txn &txn, const std::string &room_id);
+        void saveTimelineMessages(lmdb::txn &txn,
+                                  const std::string &room_id,
+                                  const mtx::responses::Timeline &res);
+
+        mtx::responses::Timeline getTimelineMessages(lmdb::txn &txn, const std::string &room_id);
+
         //! Remove a room from the cache.
         // void removeLeftRoom(lmdb::txn &txn, const std::string &room_id);
         template<class T>
@@ -500,6 +537,7 @@ private:
                        mpark::holds_alternative<StateEvent<HistoryVisibility>>(e) ||
                        mpark::holds_alternative<StateEvent<JoinRules>>(e) ||
                        mpark::holds_alternative<StateEvent<Name>>(e) ||
+                       mpark::holds_alternative<StateEvent<Member>>(e) ||
                        mpark::holds_alternative<StateEvent<PowerLevels>>(e) ||
                        mpark::holds_alternative<StateEvent<Topic>>(e);
         }
@@ -544,6 +582,15 @@ private:
                 }
         }
 
+        lmdb::dbi getMessagesDb(lmdb::txn &txn, const std::string &room_id)
+        {
+                auto db =
+                  lmdb::dbi::open(txn, std::string(room_id + "/messages").c_str(), MDB_CREATE);
+                lmdb::dbi_set_compare(txn, db, numeric_key_comparison);
+
+                return db;
+        }
+
         lmdb::dbi getInviteStatesDb(lmdb::txn &txn, const std::string &room_id)
         {
                 return lmdb::dbi::open(

include/ChatPage.h

@@ -108,7 +108,6 @@ signals:
         void showLoginPage(const QString &msg);
         void showUserSettingsPage();
         void showOverlayProgressBar();
-        void startConsesusTimer();
 
         void removeTimelineEvent(const QString &room_id, const QString &event_id);
 
@@ -124,7 +123,7 @@ signals:
 
         void initializeRoomList(QMap<QString, RoomInfo>);
         void initializeViews(const mtx::responses::Rooms &rooms);
-        void initializeEmptyViews(const std::vector<std::string> &rooms);
+        void initializeEmptyViews(const std::map<QString, mtx::responses::Timeline> &msgs);
         void syncUI(const mtx::responses::Rooms &rooms);
         void syncRoomlist(const std::map<QString, RoomInfo> &updates);
         void syncTopBar(const std::map<QString, RoomInfo> &updates);
@@ -206,9 +205,6 @@ private:
         TextInputWidget *text_input_;
         TypingDisplay *typingDisplay_;
 
-        // Safety net if consensus is not possible or too slow.
-        QTimer *showContentTimer_;
-        QTimer *consensusTimer_;
         QTimer connectivityTimer_;
         std::atomic_bool isConnected_;
 

include/RoomInfoListItem.h

@@ -22,20 +22,11 @@
 #include <QSharedPointer>
 #include <QWidget>
 
+#include "Cache.h"
 #include <mtx/responses.hpp>
 
 class Menu;
 class RippleOverlay;
-struct RoomInfo;
-
-struct DescInfo
-{
-        QString username;
-        QString userid;
-        QString body;
-        QString timestamp;
-        QDateTime datetime;
-};
 
 class RoomInfoListItem : public QWidget
 {

include/Utils.h

@@ -41,14 +41,15 @@ template<class T>
 QString
 messageDescription(const QString &username = "", const QString &body = "")
 {
-        using Audio   = mtx::events::RoomEvent<mtx::events::msg::Audio>;
-        using Emote   = mtx::events::RoomEvent<mtx::events::msg::Emote>;
-        using File    = mtx::events::RoomEvent<mtx::events::msg::File>;
-        using Image   = mtx::events::RoomEvent<mtx::events::msg::Image>;
-        using Notice  = mtx::events::RoomEvent<mtx::events::msg::Notice>;
-        using Sticker = mtx::events::Sticker;
-        using Text    = mtx::events::RoomEvent<mtx::events::msg::Text>;
-        using Video   = mtx::events::RoomEvent<mtx::events::msg::Video>;
+        using Audio     = mtx::events::RoomEvent<mtx::events::msg::Audio>;
+        using Emote     = mtx::events::RoomEvent<mtx::events::msg::Emote>;
+        using File      = mtx::events::RoomEvent<mtx::events::msg::File>;
+        using Image     = mtx::events::RoomEvent<mtx::events::msg::Image>;
+        using Notice    = mtx::events::RoomEvent<mtx::events::msg::Notice>;
+        using Sticker   = mtx::events::Sticker;
+        using Text      = mtx::events::RoomEvent<mtx::events::msg::Text>;
+        using Video     = mtx::events::RoomEvent<mtx::events::msg::Video>;
+        using Encrypted = mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>;
 
         if (std::is_same<T, AudioItem>::value || std::is_same<T, Audio>::value)
                 return QString("sent an audio clip");
@@ -66,6 +67,8 @@ messageDescription(const QString &username = "", const QString &body = "")
                 return QString(": %1").arg(body);
         else if (std::is_same<T, Emote>::value)
                 return QString("* %1 %2").arg(username).arg(body);
+        else if (std::is_same<T, Encrypted>::value)
+                return QString("sent an encrypted message");
 }
 
 template<class T, class Event>
@@ -135,6 +138,18 @@ erase_if(ContainerT &items, const PredicateT &predicate)
         }
 }
 
+inline uint64_t
+event_timestamp(const mtx::events::collections::TimelineEvents &event)
+{
+        return mpark::visit([](auto msg) { return msg.origin_server_ts; }, event);
+}
+
+inline nlohmann::json
+serialize_event(const mtx::events::collections::TimelineEvents &event)
+{
+        return mpark::visit([](auto msg) { return json(msg); }, event);
+}
+
 inline mtx::events::EventType
 event_type(const mtx::events::collections::TimelineEvents &event)
 {

include/timeline/TimelineView.h

@@ -158,6 +158,7 @@ public:
 
         //! Remove an item from the timeline with the given Event ID.
         void removeEvent(const QString &event_id);
+        void setPrevBatchToken(const QString &token) { prev_batch_token_ = token; }
 
 public slots:
         void sliderRangeChanged(int min, int max);

include/timeline/TimelineViewManager.h

@@ -27,6 +27,7 @@ class QFile;
 class RoomInfoListItem;
 class TimelineView;
 struct DescInfo;
+struct SavedMessages;
 
 class TimelineViewManager : public QStackedWidget
 {
@@ -57,6 +58,7 @@ signals:
 
 public slots:
         void removeTimelineEvent(const QString &room_id, const QString &event_id);
+        void initWithMessages(const std::map<QString, mtx::responses::Timeline> &msgs);
 
         void setHistoryView(const QString &room_id);
         void queueTextMessage(const QString &msg);

src/Cache.cc

@@ -21,8 +21,10 @@
 #include <QByteArray>
 #include <QFile>
 #include <QHash>
+#include <QSettings>
 #include <QStandardPaths>
 
+#include <mtx/responses/common.hpp>
 #include <variant.hpp>
 
 #include "Cache.h"
@@ -38,6 +40,8 @@ static const lmdb::val NEXT_BATCH_KEY("next_batch");
 static const lmdb::val OLM_ACCOUNT_KEY("olm_account");
 static const lmdb::val CACHE_FORMAT_VERSION_KEY("cache_format_version");
 
+constexpr size_t MAX_RESTORED_MESSAGES = 30;
+
 //! Cache databases and their format.
 //!
 //! Contains UI information for the joined rooms. (i.e name, topic, avatar url etc).
@@ -85,6 +89,7 @@ init(const QString &user_id)
         qRegisterMetaType<RoomInfo>();
         qRegisterMetaType<QMap<QString, RoomInfo>>();
         qRegisterMetaType<std::map<QString, RoomInfo>>();
+        qRegisterMetaType<std::map<QString, mtx::responses::Timeline>>();
 
         instance_ = std::make_unique<Cache>(user_id);
 }
@@ -744,6 +749,8 @@ Cache::saveState(const mtx::responses::Sync &res)
                 saveStateEvents(txn, statesdb, membersdb, room.first, room.second.state.events);
                 saveStateEvents(txn, statesdb, membersdb, room.first, room.second.timeline.events);
 
+                saveTimelineMessages(txn, room.first, room.second.timeline);
+
                 RoomInfo updatedInfo;
                 updatedInfo.name  = getRoomName(txn, statesdb, membersdb).toStdString();
                 updatedInfo.topic = getRoomTopic(txn, statesdb).toStdString();
@@ -944,6 +951,57 @@ Cache::getRoomInfo(const std::vector<std::string> &rooms)
         return room_info;
 }
 
+std::map<QString, mtx::responses::Timeline>
+Cache::roomMessages()
+{
+        auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
+
+        std::map<QString, mtx::responses::Timeline> msgs;
+        std::string room_id, unused;
+
+        auto roomsCursor = lmdb::cursor::open(txn, roomsDb_);
+        while (roomsCursor.get(room_id, unused, MDB_NEXT))
+                msgs.emplace(QString::fromStdString(room_id), getTimelineMessages(txn, room_id));
+
+        roomsCursor.close();
+        txn.commit();
+
+        return msgs;
+}
+
+mtx::responses::Timeline
+Cache::getTimelineMessages(lmdb::txn &txn, const std::string &room_id)
+{
+        auto db = getMessagesDb(txn, room_id);
+
+        mtx::responses::Timeline timeline;
+        std::string timestamp, msg;
+
+        auto cursor = lmdb::cursor::open(txn, db);
+
+        size_t index = 0;
+
+        while (cursor.get(timestamp, msg, MDB_NEXT) && index < MAX_RESTORED_MESSAGES) {
+                auto obj = json::parse(msg);
+
+                if (obj.count("event") == 0 || obj.count("token") == 0)
+                        continue;
+
+                mtx::events::collections::TimelineEvents event;
+                mtx::events::collections::from_json(obj.at("event"), event);
+
+                index += 1;
+
+                timeline.events.push_back(event);
+                timeline.prev_batch = obj.at("token").get<std::string>();
+        }
+        cursor.close();
+
+        std::reverse(timeline.events.begin(), timeline.events.end());
+
+        return timeline;
+}
+
 QMap<QString, RoomInfo>
 Cache::roomInfo(bool withInvites)
 {
@@ -959,6 +1017,8 @@ Cache::roomInfo(bool withInvites)
         while (roomsCursor.get(room_id, room_data, MDB_NEXT)) {
                 RoomInfo tmp     = json::parse(std::move(room_data));
                 tmp.member_count = getMembersDb(txn, room_id).size(txn);
+                tmp.msgInfo      = getLastMessageInfo(txn, room_id);
+
                 result.insert(QString::fromStdString(std::move(room_id)), std::move(tmp));
         }
         roomsCursor.close();
@@ -979,6 +1039,38 @@ Cache::roomInfo(bool withInvites)
         return result;
 }
 
+DescInfo
+Cache::getLastMessageInfo(lmdb::txn &txn, const std::string &room_id)
+{
+        auto db = getMessagesDb(txn, room_id);
+
+        if (db.size(txn) == 0)
+                return DescInfo{};
+
+        std::string timestamp, msg;
+
+        QSettings settings;
+        auto local_user = settings.value("auth/user_id").toString();
+
+        auto cursor = lmdb::cursor::open(txn, db);
+        while (cursor.get(timestamp, msg, MDB_NEXT)) {
+                auto obj = json::parse(msg);
+
+                if (obj.count("event") == 0)
+                        continue;
+
+                mtx::events::collections::TimelineEvents event;
+                mtx::events::collections::from_json(obj.at("event"), event);
+
+                cursor.close();
+                return utils::getMessageDescription(
+                  event, local_user, QString::fromStdString(room_id));
+        }
+        cursor.close();
+
+        return DescInfo{};
+}
+
 std::map<QString, bool>
 Cache::invites()
 {
@@ -1512,6 +1604,35 @@ Cache::getMembers(const std::string &room_id, std::size_t startIndex, std::size_
         return members;
 }
 
+void
+Cache::saveTimelineMessages(lmdb::txn &txn,
+                            const std::string &room_id,
+                            const mtx::responses::Timeline &res)
+{
+        auto db = getMessagesDb(txn, room_id);
+
+        using namespace mtx::events;
+        using namespace mtx::events::state;
+
+        for (const auto &e : res.events) {
+                if (isStateEvent(e))
+                        continue;
+
+                if (mpark::holds_alternative<RedactionEvent<msg::Redaction>>(e))
+                        continue;
+
+                json obj = json::object();
+
+                obj["event"] = utils::serialize_event(e);
+                obj["token"] = res.prev_batch;
+
+                lmdb::dbi_put(txn,
+                              db,
+                              lmdb::val(std::to_string(utils::event_timestamp(e))),
+                              lmdb::val(obj.dump()));
+        }
+}
+
 void
 Cache::markSentNotification(const std::string &event_id)
 {

src/ChatPage.cc

@@ -516,23 +516,6 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
         connect(this, &ChatPage::leftRoom, this, &ChatPage::removeRoom);
         connect(this, &ChatPage::notificationsRetrieved, this, &ChatPage::sendDesktopNotifications);
 
-        showContentTimer_ = new QTimer(this);
-        showContentTimer_->setSingleShot(true);
-        connect(showContentTimer_, &QTimer::timeout, this, [this]() {
-                consensusTimer_->stop();
-                emit contentLoaded();
-        });
-
-        consensusTimer_ = new QTimer(this);
-        connect(consensusTimer_, &QTimer::timeout, this, [this]() {
-                if (view_manager_->hasLoaded()) {
-                        // Remove the spinner overlay.
-                        emit contentLoaded();
-                        showContentTimer_->stop();
-                        consensusTimer_->stop();
-                }
-        });
-
         connect(communitiesList_,
                 &CommunitiesList::communityChanged,
                 this,
@@ -552,20 +535,15 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
                 this,
                 &ChatPage::setGroupViewState);
 
-        connect(this, &ChatPage::startConsesusTimer, this, [this]() {
-                consensusTimer_->start(CONSENSUS_TIMEOUT);
-                showContentTimer_->start(SHOW_CONTENT_TIMEOUT);
-        });
         connect(this, &ChatPage::initializeRoomList, room_list_, &RoomList::initialize);
         connect(this,
                 &ChatPage::initializeViews,
                 view_manager_,
                 [this](const mtx::responses::Rooms &rooms) { view_manager_->initialize(rooms); });
-        connect(
-          this,
-          &ChatPage::initializeEmptyViews,
-          this,
-          [this](const std::vector<std::string> &rooms) { view_manager_->initialize(rooms); });
+        connect(this,
+                &ChatPage::initializeEmptyViews,
+                view_manager_,
+                &TimelineViewManager::initWithMessages);
         connect(this, &ChatPage::syncUI, this, [this](const mtx::responses::Rooms &rooms) {
                 try {
                         room_list_->cleanupInvites(cache::client()->invites());
@@ -817,6 +795,8 @@ ChatPage::showUnreadMessageNotification(int count)
 void
 ChatPage::loadStateFromCache()
 {
+        emit contentLoaded();
+
         nhlog::db()->info("restoring state from cache");
 
         getProfileInfo();
@@ -829,8 +809,9 @@ ChatPage::loadStateFromCache()
 
                         cache::client()->populateMembers();
 
-                        emit initializeEmptyViews(cache::client()->joinedRooms());
+                        emit initializeEmptyViews(cache::client()->roomMessages());
                         emit initializeRoomList(cache::client()->roomInfo());
+
                 } catch (const mtx::crypto::olm_exception &e) {
                         nhlog::crypto()->critical("failed to restore olm account: {}", e.what());
                         emit dropToLoginPageCb(
@@ -841,6 +822,9 @@ ChatPage::loadStateFromCache()
                         emit dropToLoginPageCb(
                           tr("Failed to restore save data. Please login again."));
                         return;
+                } catch (const json::exception &e) {
+                        nhlog::db()->critical("failed to parse cache data: {}", e.what());
+                        return;
                 }
 
                 nhlog::crypto()->info("ed25519   : {}", olm::client()->identity_keys().ed25519);
@@ -848,9 +832,6 @@ ChatPage::loadStateFromCache()
 
                 // Start receiving events.
                 emit trySyncCb();
-
-                // Check periodically if the timelines have been loaded.
-                emit startConsesusTimer();
         });
 }
 

src/MainWindow.cc

@@ -234,7 +234,8 @@ MainWindow::showChatPage()
 
         showOverlayProgressBar();
 
-        QTimer::singleShot(100, this, [this]() { pageStack_->setCurrentWidget(chat_page_); });
+        welcome_page_->hide();
+        pageStack_->setCurrentWidget(chat_page_);
 
         login_page_->reset();
         chat_page_->bootstrap(userid, homeserver, token);

src/RoomList.cc

@@ -15,6 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <QApplication>
 #include <QBuffer>
 #include <QObject>
 #include <QTimer>
@@ -171,6 +172,8 @@ RoomList::initialize(const QMap<QString, RoomInfo> &info)
 
         rooms_.clear();
 
+        setUpdatesEnabled(false);
+
         for (auto it = info.begin(); it != info.end(); it++) {
                 if (it.value().is_invite)
                         addInvitedRoom(it.key(), it.value());
@@ -178,6 +181,11 @@ RoomList::initialize(const QMap<QString, RoomInfo> &info)
                         addRoom(it.key(), it.value());
         }
 
+        for (auto it = info.begin(); it != info.end(); it++)
+                updateRoomDescription(it.key(), it.value().msgInfo);
+
+        setUpdatesEnabled(true);
+
         if (rooms_.empty())
                 return;
 

src/Utils.cc

@@ -28,13 +28,14 @@ utils::getMessageDescription(const TimelineEvent &event,
                              const QString &localUser,
                              const QString &room_id)
 {
-        using Audio  = mtx::events::RoomEvent<mtx::events::msg::Audio>;
-        using Emote  = mtx::events::RoomEvent<mtx::events::msg::Emote>;
-        using File   = mtx::events::RoomEvent<mtx::events::msg::File>;
-        using Image  = mtx::events::RoomEvent<mtx::events::msg::Image>;
-        using Notice = mtx::events::RoomEvent<mtx::events::msg::Notice>;
-        using Text   = mtx::events::RoomEvent<mtx::events::msg::Text>;
-        using Video  = mtx::events::RoomEvent<mtx::events::msg::Video>;
+        using Audio     = mtx::events::RoomEvent<mtx::events::msg::Audio>;
+        using Emote     = mtx::events::RoomEvent<mtx::events::msg::Emote>;
+        using File      = mtx::events::RoomEvent<mtx::events::msg::File>;
+        using Image     = mtx::events::RoomEvent<mtx::events::msg::Image>;
+        using Notice    = mtx::events::RoomEvent<mtx::events::msg::Notice>;
+        using Text      = mtx::events::RoomEvent<mtx::events::msg::Text>;
+        using Video     = mtx::events::RoomEvent<mtx::events::msg::Video>;
+        using Encrypted = mtx::events::EncryptedEvent<mtx::events::msg::Encrypted>;
 
         if (mpark::holds_alternative<Audio>(event)) {
                 return createDescriptionInfo<Audio>(event, localUser, room_id);
@@ -52,6 +53,27 @@ utils::getMessageDescription(const TimelineEvent &event,
                 return createDescriptionInfo<Video>(event, localUser, room_id);
         } else if (mpark::holds_alternative<mtx::events::Sticker>(event)) {
                 return createDescriptionInfo<mtx::events::Sticker>(event, localUser, room_id);
+        } else if (mpark::holds_alternative<Encrypted>(event)) {
+                const auto msg    = mpark::get<Encrypted>(event);
+                const auto sender = QString::fromStdString(msg.sender);
+
+                const auto username = Cache::displayName(room_id, sender);
+                const auto ts       = QDateTime::fromMSecsSinceEpoch(msg.origin_server_ts);
+
+                DescInfo info;
+                if (sender == localUser)
+                        info.username = "You";
+                else
+                        info.username = username;
+
+                info.userid    = sender;
+                info.body      = QString(" %1").arg(messageDescription<Encrypted>());
+                info.timestamp = utils::descriptiveTime(ts);
+                info.datetime  = ts;
+
+                return info;
+        } else {
+                std::cout << "type not found: " << serialize_event(event).dump(2) << '\n';
         }
 
         return DescInfo{};

src/timeline/TimelineView.cc

@@ -378,7 +378,7 @@ TimelineView::renderBottomEvents(const std::vector<TimelineEvent> &events)
 
                         // Prevent blocking of the event-loop
                         // by calling processEvents every 10 items we render.
-                        if (counter % 10 == 0)
+                        if (counter % 4 == 0)
                                 QApplication::processEvents();
                 }
         }
@@ -1035,7 +1035,8 @@ TimelineEvent
 TimelineView::findLastViewableEvent(const std::vector<TimelineEvent> &events)
 {
         auto it = std::find_if(events.rbegin(), events.rend(), [](const auto &event) {
-                return mtx::events::EventType::RoomMessage == utils::event_type(event);
+                return (mtx::events::EventType::RoomMessage == utils::event_type(event)) ||
+                       (mtx::events::EventType::RoomEncrypted == utils::event_type(event));
         });
 
         return (it == std::rend(events)) ? events.back() : *it;

src/timeline/TimelineViewManager.cc

@@ -21,6 +21,7 @@
 #include <QFileInfo>
 #include <QSettings>
 
+#include "Cache.h"
 #include "Logging.hpp"
 #include "timeline/TimelineView.h"
 #include "timeline/TimelineViewManager.h"
@@ -146,6 +147,27 @@ TimelineViewManager::initialize(const mtx::responses::Rooms &rooms)
         sync(rooms);
 }
 
+void
+TimelineViewManager::initWithMessages(const std::map<QString, mtx::responses::Timeline> &msgs)
+{
+        for (auto it = msgs.cbegin(); it != msgs.cend(); ++it) {
+                if (timelineViewExists(it->first))
+                        return;
+
+                // Create a history view with the room events.
+                TimelineView *view = new TimelineView(it->second, it->first);
+                views_.emplace(it->first, QSharedPointer<TimelineView>(view));
+
+                connect(view,
+                        &TimelineView::updateLastTimelineMessage,
+                        this,
+                        &TimelineViewManager::updateRoomsLastMessage);
+
+                // Add the view in the widget stack.
+                addWidget(view);
+        }
+}
+
 void
 TimelineViewManager::initialize(const std::vector<std::string> &rooms)
 {