also decrypt messages in the sync response that enabled encryption

like initial sync

src/matrix/Sync.js

@@ -41,17 +41,14 @@ function timelineIsEmpty(roomResponse) {
 /**
  * Sync steps in js-pseudocode:
  * ```js
- * let preparation;
- * if (room.needsPrepareSync) {
  * // can only read some stores
- *     preparation = await room.prepareSync(roomResponse, prepareTxn);
+ * const preparation = await room.prepareSync(roomResponse, membership, prepareTxn);
  * // can do async work that is not related to storage (such as decryption)
- *     preparation = await room.afterPrepareSync(preparation);
+ * await room.afterPrepareSync(preparation);
- * }
  * // writes and calculates changes
- * const changes = await room.writeSync(roomResponse, membership, isInitialSync, preparation, syncTxn);
+ * const changes = await room.writeSync(roomResponse, isInitialSync, preparation, syncTxn);
  * // applies and emits changes once syncTxn is committed
- * room.afterSync(changes);
+ * room.afterSync(changes, preparation);
  * if (room.needsAfterSyncCompleted(changes)) {
  *     // can do network requests
  *     await room.afterSyncCompleted(changes);
@@ -173,14 +170,14 @@ export class Sync {
         const isInitialSync = !syncToken;
         syncToken = response.next_batch;
         const roomStates = this._parseRoomsResponse(response.rooms, isInitialSync);
-        await this._prepareRooms(roomStates);
+        await this._prepareRooms(roomStates, isInitialSync);
         let sessionChanges;
         const syncTxn = await this._openSyncTxn();
         try {
             await Promise.all(roomStates.map(async rs => {
                 console.log(` * applying sync response to room ${rs.room.id} ...`);
                 rs.changes = await rs.room.writeSync(
-                    rs.roomResponse, rs.membership, isInitialSync, rs.preparation, syncTxn);
+                    rs.roomResponse, isInitialSync, rs.preparation, syncTxn);
             }));
             sessionChanges = await this._session.writeSync(response, syncFilterId, syncTxn);
         } catch(err) {
@@ -219,16 +216,11 @@ export class Sync {
     }
 
     async _prepareRooms(roomStates) {
-        const prepareRoomStates = roomStates.filter(rs => rs.room.needsPrepareSync);
-        if (prepareRoomStates.length) {
         const prepareTxn = await this._openPrepareSyncTxn();
-            await Promise.all(prepareRoomStates.map(async rs => {
+        await Promise.all(roomStates.map(async rs => {
-                rs.preparation = await rs.room.prepareSync(rs.roomResponse, prepareTxn);
+            rs.preparation = await rs.room.prepareSync(rs.roomResponse, rs.membership, prepareTxn);
         }));
-            await Promise.all(prepareRoomStates.map(async rs => {
+        await Promise.all(roomStates.map(rs => rs.room.afterPrepareSync(rs.preparation)));
-                rs.preparation = await rs.room.afterPrepareSync(rs.preparation);
-            }));
-        }
     }
 
     async _openSyncTxn() {

src/matrix/room/Room.js

@@ -37,7 +37,7 @@ export class Room extends EventEmitter {
         this._storage = storage;
         this._hsApi = hsApi;
         this._mediaRepository = mediaRepository;
-		this._summary = new RoomSummary(roomId, user.id);
+		this._summary = new RoomSummary(roomId);
         this._fragmentIdComparer = new FragmentIdComparer([]);
 		this._syncWriter = new SyncWriter({roomId, fragmentIdComparer: this._fragmentIdComparer});
         this._emitCollectionChange = emitCollectionChange;
@@ -84,18 +84,17 @@ export class Room extends EventEmitter {
                 // _decryptEntries entries and could even know which events have been decrypted for the first
                 // time from DecryptionChanges.write and only pass those to the summary. As timeline changes
                 // are not essential to the room summary, it's fine to write this in a separate txn for now.
-                const changes = this._summary.processTimelineEntries(retryEntries, false, this._isTimelineOpen);
+                const changes = this._summary.data.applyTimelineEntries(retryEntries, false, this._isTimelineOpen);
-                if (changes) {
+                if (await this._summary.writeAndApplyData(changes, this._storage)) {
-                    this._summary.writeAndApplyChanges(changes, this._storage);
                     this._emitUpdate();
                 }
             }
         }
     }
 
-    _enableEncryption(encryptionParams) {
+    _setEncryption(roomEncryption) {
-        this._roomEncryption = this._createRoomEncryption(this, encryptionParams);
+        if (roomEncryption && !this._roomEncryption) {
-        if (this._roomEncryption) {
+            this._roomEncryption = roomEncryption;
             this._sendQueue.enableEncryption(this._roomEncryption);
             if (this._timeline) {
                 this._timeline.enableEncryption(this._decryptEntries.bind(this, DecryptionSource.Timeline));
@@ -141,57 +140,62 @@ export class Room extends EventEmitter {
         return request;
     }
 
-    get needsPrepareSync() {
+    async prepareSync(roomResponse, membership, txn) {
-        // only encrypted rooms need the prepare sync steps
+        const summaryChanges = this._summary.data.applySyncResponse(roomResponse, membership)
-        return !!this._roomEncryption;
+        let roomEncryption = this._roomEncryption;
+        // encryption is enabled in this sync
+        if (!roomEncryption && summaryChanges.encryption) {
+            roomEncryption = this._createRoomEncryption(this, summaryChanges.encryption);
         }
 
-    async prepareSync(roomResponse, txn) {
+        let decryptPreparation;
-        if (this._roomEncryption) {
+        if (roomEncryption) {
             const events = roomResponse?.timeline?.events;
             if (Array.isArray(events)) {
                 const eventsToDecrypt = events.filter(event => {
                     return event?.type === EVENT_ENCRYPTED_TYPE;
                 });
-                const preparation = await this._roomEncryption.prepareDecryptAll(
+                decryptPreparation = await roomEncryption.prepareDecryptAll(
                     eventsToDecrypt, DecryptionSource.Sync, this._isTimelineOpen, txn);
-                return preparation;
-            }
             }
         }
 
+        return {
+            roomEncryption,
+            summaryChanges,
+            decryptPreparation,
+            decryptChanges: null,
+        };
+    }
+
     async afterPrepareSync(preparation) {
-        if (preparation) {
+        if (preparation.decryptPreparation) {
-            const decryptChanges = await preparation.decrypt();
+            preparation.decryptChanges = await preparation.decryptPreparation.decrypt();
-            return decryptChanges;
+            preparation.decryptPreparation = null;
         }
     }
 
     /** @package */
-    async writeSync(roomResponse, membership, isInitialSync, decryptChanges, txn) {
+    async writeSync(roomResponse, isInitialSync, {summaryChanges, decryptChanges, roomEncryption}, txn) {
-        let decryption;
-        if (this._roomEncryption && decryptChanges) {
-            decryption = await decryptChanges.write(txn);
-        }
 		const {entries, newLiveKey, memberChanges} =
             await this._syncWriter.writeSync(roomResponse, txn);
-        if (decryption) {
+        if (decryptChanges) {
+            const decryption = await decryptChanges.write(txn);
             decryption.applyToEntries(entries);
         }
         // pass member changes to device tracker
-        if (this._roomEncryption && this.isTrackingMembers && memberChanges?.size) {
+        if (roomEncryption && this.isTrackingMembers && memberChanges?.size) {
-            await this._roomEncryption.writeMemberChanges(memberChanges, txn);
+            await roomEncryption.writeMemberChanges(memberChanges, txn);
         }
-		const summaryChanges = this._summary.writeSync(
+        // also apply (decrypted) timeline entries to the summary changes
-            roomResponse,
+        summaryChanges = summaryChanges.applyTimelineEntries(
-            entries,
+            entries, isInitialSync, this._isTimelineOpen, this._user.id);
-            membership,
+        // write summary changes, and unset if nothing was actually changed
-            isInitialSync, this._isTimelineOpen,
+        summaryChanges = this._summary.writeData(summaryChanges, txn);
-            txn);
         // fetch new members while we have txn open,
         // but don't make any in-memory changes yet
         let heroChanges;
-        if (summaryChanges && needsHeroes(summaryChanges)) {
+        if (summaryChanges?.needsHeroes) {
             // room name disappeared, open heroes
             if (!this._heroes) {
                 this._heroes = new Heroes(this._roomId);
@@ -204,6 +208,7 @@ export class Room extends EventEmitter {
         }
         return {
             summaryChanges,
+            roomEncryption,
             newTimelineEntries: entries,
             newLiveKey,
             removedPendingEvents,
@@ -217,11 +222,9 @@ export class Room extends EventEmitter {
      * Called with the changes returned from `writeSync` to apply them and emit changes.
      * No storage or network operations should be done here.
      */
-    afterSync({summaryChanges, newTimelineEntries, newLiveKey, removedPendingEvents, memberChanges, heroChanges}) {
+    afterSync({summaryChanges, newTimelineEntries, newLiveKey, removedPendingEvents, memberChanges, heroChanges, roomEncryption}) {
         this._syncWriter.afterSync(newLiveKey);
-        if (!this._summary.encryption && summaryChanges.encryption && !this._roomEncryption) {
+        this._setEncryption(roomEncryption);
-            this._enableEncryption(summaryChanges.encryption);
-        }
         if (memberChanges.size) {
             if (this._changedMembersDuringSync) {
                 for (const [userId, memberChange] of memberChanges.entries()) {
@@ -235,14 +238,14 @@ export class Room extends EventEmitter {
         let emitChange = false;
         if (summaryChanges) {
             this._summary.applyChanges(summaryChanges);
-            if (!this._summary.needsHeroes) {
+            if (!this._summary.data.needsHeroes) {
                 this._heroes = null;
             }
             emitChange = true;
         }
         if (this._heroes && heroChanges) {
             const oldName = this.name;
-            this._heroes.applyChanges(heroChanges, this._summary);
+            this._heroes.applyChanges(heroChanges, this._summary.data);
             if (oldName !== this.name) {
                 emitChange = true;
             }
@@ -294,14 +297,15 @@ export class Room extends EventEmitter {
 	async load(summary, txn) {
         try {
             this._summary.load(summary);
-            if (this._summary.encryption) {
+            if (this._summary.data.encryption) {
-                this._enableEncryption(this._summary.encryption);
+                const roomEncryption = this._createRoomEncryption(this, this._summary.data.encryption);
+                this._setEncryption(roomEncryption);
             }
             // need to load members for name?
-            if (this._summary.needsHeroes) {
+            if (this._summary.data.needsHeroes) {
                 this._heroes = new Heroes(this._roomId);
-                const changes = await this._heroes.calculateChanges(this._summary.heroes, [], txn);
+                const changes = await this._heroes.calculateChanges(this._summary.data.heroes, [], txn);
-                this._heroes.applyChanges(changes, this._summary);
+                this._heroes.applyChanges(changes, this._summary.data);
             }
             return this._syncWriter.load(txn);
         } catch (err) {
@@ -397,7 +401,14 @@ export class Room extends EventEmitter {
         if (this._heroes) {
             return this._heroes.roomName;
         }
-        return this._summary.name;
+        const summaryData = this._summary.data;
+        if (summaryData.name) {
+            return summaryData.name;
+        }
+        if (summaryData.canonicalAlias) {
+            return summaryData.canonicalAlias;
+        }
+        return null;
     }
 
     /** @public */
@@ -406,8 +417,8 @@ export class Room extends EventEmitter {
     }
 
     get avatarUrl() {
-        if (this._summary.avatarUrl) {
+        if (this._summary.data.avatarUrl) {
-            return this._summary.avatarUrl;
+            return this._summary.data.avatarUrl;
         } else if (this._heroes) {
             return this._heroes.roomAvatarUrl;
         }
@@ -415,28 +426,28 @@ export class Room extends EventEmitter {
     }
 
     get lastMessageTimestamp() {
-        return this._summary.lastMessageTimestamp;
+        return this._summary.data.lastMessageTimestamp;
     }
 
     get isUnread() {
-        return this._summary.isUnread;
+        return this._summary.data.isUnread;
     }
 
     get notificationCount() {
-        return this._summary.notificationCount;
+        return this._summary.data.notificationCount;
     }
     
     get highlightCount() {
-        return this._summary.highlightCount;
+        return this._summary.data.highlightCount;
     }
 
     get isLowPriority() {
-        const tags = this._summary.tags;
+        const tags = this._summary.data.tags;
         return !!(tags && tags['m.lowpriority']);
     }
 
     get isEncrypted() {
-        return !!this._summary.encryption;
+        return !!this._summary.data.encryption;
     }
 
     enableSessionBackup(sessionBackup) {
@@ -444,7 +455,7 @@ export class Room extends EventEmitter {
     }
 
     get isTrackingMembers() {
-        return this._summary.isTrackingMembers;
+        return this._summary.data.isTrackingMembers;
     }
 
     async _getLastEventId() {

src/matrix/room/RoomSummary.js

@@ -39,16 +39,17 @@ function applySyncResponse(data, roomResponse, membership) {
     if (roomResponse.account_data) {
         data = roomResponse.account_data.events.reduce(processRoomAccountData, data);
     }
+    const stateEvents = roomResponse?.state?.events;
     // state comes before timeline
-    if (roomResponse.state) {
+    if (Array.isArray(stateEvents)) {
-        data = roomResponse.state.events.reduce(processStateEvent, data);
+        data = stateEvents.reduce(processStateEvent, data);
     }
-    const {timeline} = roomResponse;
+    const timelineEvents = roomResponse?.timeline?.events;
     // process state events in timeline
     // non-state events are handled by applyTimelineEntries
     // so decryption is handled properly
-    if (timeline && Array.isArray(timeline.events)) {
+    if (Array.isArray(timelineEvents)) {
-        data = timeline.events.reduce((data, event) => {
+        data = timelineEvents.reduce((data, event) => {
             if (typeof event.state_key === "string") {
                 return processStateEvent(data, event);
             }
@@ -200,87 +201,27 @@ class SummaryData {
         const {cloned, ...serializedProps} = this;
         return serializedProps;
     }
+
+    applyTimelineEntries(timelineEntries, isInitialSync, isTimelineOpen, ownUserId) {
+        return applyTimelineEntries(this, timelineEntries, isInitialSync, isTimelineOpen, ownUserId);
     }
 
-export function needsHeroes(data) {
+    applySyncResponse(roomResponse, membership) {
-    return !data.name && !data.canonicalAlias && data.heroes && data.heroes.length > 0;
+        return applySyncResponse(this, roomResponse, membership);
+    }
+
+    get needsHeroes() {
+        return !this.name && !this.canonicalAlias && this.heroes && this.heroes.length > 0;
+    }
 }
 
 export class RoomSummary {
-	constructor(roomId, ownUserId) {
+	constructor(roomId) {
-        this._ownUserId = ownUserId;
         this._data = new SummaryData(null, roomId);
 	}
 
-	get name() {
+    get data() {
-		if (this._data.name) {
+        return this._data;
-            return this._data.name;
-        }
-        if (this._data.canonicalAlias) {
-            return this._data.canonicalAlias;
-        }
-        return null;
-	}
-
-    get heroes() {
-        return this._data.heroes;
-    }
-
-    get encryption() {
-        return this._data.encryption;
-    }
-
-    // whether the room name should be determined with Heroes
-    get needsHeroes() {
-        return needsHeroes(this._data);
-    }
-
-    get isUnread() {
-        return this._data.isUnread;
-    }
-
-    get notificationCount() {
-        return this._data.notificationCount;
-    }
-
-    get highlightCount() {
-        return this._data.highlightCount;
-    }
-
-	get lastMessage() {
-		return this._data.lastMessageBody;
-	}
-
-    get lastMessageTimestamp() {
-        return this._data.lastMessageTimestamp;
-    }
-
-	get inviteCount() {
-		return this._data.inviteCount;
-	}
-
-	get joinCount() {
-		return this._data.joinCount;
-	}
-
-    get avatarUrl() {
-        return this._data.avatarUrl;
-    }
-
-    get hasFetchedMembers() {
-        return this._data.hasFetchedMembers;
-    }
-
-    get isTrackingMembers() {
-        return this._data.isTrackingMembers;
-    }
-    
-    get tags() {
-        return this._data.tags;
-    }
-
-    get lastDecryptedEventKey() {
-        return this._data.lastDecryptedEventKey;
     }
 
     writeClearUnread(txn) {
@@ -306,45 +247,17 @@ export class RoomSummary {
         return data;
     }
 
-    /**
+	writeData(data, txn) {
-     * after retrying decryption
-     */
-    processTimelineEntries(timelineEntries, isInitialSync, isTimelineOpen) {
-        // clear cloned flag, so cloneIfNeeded makes a copy and
-        // this._data is not modified if any field is changed.
-        this._data.cloned = false;
-        const data = applyTimelineEntries(
-            this._data,
-            timelineEntries,
-            isInitialSync, isTimelineOpen,
-            this._ownUserId);
-        if (data !== this._data) {
-            return data;
-        }
-    }
-
-	writeSync(roomResponse, timelineEntries, membership, isInitialSync, isTimelineOpen, txn) {
-        // clear cloned flag, so cloneIfNeeded makes a copy and
-        // this._data is not modified if any field is changed.
-        this._data.cloned = false;
-        let data = applySyncResponse(this._data, roomResponse, membership);
-        data = applyTimelineEntries(
-            data,
-            timelineEntries,
-            isInitialSync, isTimelineOpen,
-            this._ownUserId);
 		if (data !== this._data) {
             txn.roomSummary.set(data.serialize());
             return data;
 		}
 	}
 
-    /**
+    async writeAndApplyData(data, storage) {
-     * Only to be used with processTimelineEntries,
+        if (data === this._data) {
-     * other methods like writeSync, writeHasFetchedMembers,
+            return;
-     * writeIsTrackingMembers, ... take a txn directly.
+        }
-     */
-    async writeAndApplyChanges(data, storage) {
         const txn = await storage.readWriteTxn([
             storage.storeNames.roomSummary,
         ]);
@@ -360,6 +273,9 @@ export class RoomSummary {
 
     applyChanges(data) {
         this._data = data;
+        // clear cloned flag, so cloneIfNeeded makes a copy and
+        // this._data is not modified if any field is changed.
+        this._data.cloned = false;
     }
 
 	async load(summary) {

src/matrix/room/members/Heroes.js

@@ -16,8 +16,8 @@ limitations under the License.
 
 import {RoomMember} from "./RoomMember.js";
 
-function calculateRoomName(sortedMembers, summary) {
+function calculateRoomName(sortedMembers, summaryData) {
-    const countWithoutMe = summary.joinCount + summary.inviteCount - 1;
+    const countWithoutMe = summaryData.joinCount + summaryData.inviteCount - 1;
     if (sortedMembers.length >= countWithoutMe) {
         if (sortedMembers.length > 1) {
             const lastMember = sortedMembers[sortedMembers.length - 1];
@@ -74,7 +74,7 @@ export class Heroes {
         return {updatedHeroMembers: updatedHeroMembers.values(), removedUserIds};
     }
 
-    applyChanges({updatedHeroMembers, removedUserIds}, summary) {
+    applyChanges({updatedHeroMembers, removedUserIds}, summaryData) {
         for (const userId of removedUserIds) {
             this._members.delete(userId);
         }
@@ -82,7 +82,7 @@ export class Heroes {
             this._members.set(member.userId, member);
         }
         const sortedMembers = Array.from(this._members.values()).sort((a, b) => a.name.localeCompare(b.name));
-        this._roomName = calculateRoomName(sortedMembers, summary);
+        this._roomName = calculateRoomName(sortedMembers, summaryData);
     }
 
     get roomName() {

src/matrix/room/members/load.js

@@ -82,7 +82,7 @@ async function fetchMembers({summary, syncToken, roomId, hsApi, storage, setChan
 
 export async function fetchOrLoadMembers(options) {
     const {summary} = options;
-    if (!summary.hasFetchedMembers) {
+    if (!summary.data.hasFetchedMembers) {
         return fetchMembers(options);
     } else {
         return loadMembers(options);