Improve boot time by implementing sliding sync

packages/host/app/components/ai-assistant/panel.gts

@@ -657,7 +657,8 @@ export default class AiAssistantPanel extends Component<Signature> {
     return Boolean(
       this.matrixService.currentRoomId &&
         this.maybeMonacoSDK &&
-        this.doCreateRoom.isIdle,
+        this.doCreateRoom.isIdle &&
+        !this.matrixService.isLoadingTimeline,
     );
   }
 }

packages/host/app/services/matrix-service.ts

@@ -4,7 +4,7 @@ import { debounce } from '@ember/runloop';
 import Service, { service } from '@ember/service';
 import { cached, tracked } from '@glimmer/tracking';
 
-import { task } from 'ember-concurrency';
+import { task, timeout, restartableTask } from 'ember-concurrency';
 import window from 'ember-window-mock';
 import { cloneDeep } from 'lodash';
 import {
@@ -14,6 +14,12 @@ import {
   type EmittedEvents,
   type ISendEventResponse,
 } from 'matrix-js-sdk';
+import {
+  SlidingSync,
+  MSC3575List,
+  SlidingSyncEvent,
+} from 'matrix-js-sdk/lib/sliding-sync';
+import { SlidingSyncState } from 'matrix-js-sdk/lib/sliding-sync';
 import stringify from 'safe-stable-stringify';
 import { md5 } from 'super-fast-md5';
 import { TrackedMap } from 'tracked-built-ins';
@@ -115,6 +121,10 @@ import type * as MatrixSDK from 'matrix-js-sdk';
 const { matrixURL } = ENV;
 const MAX_CARD_SIZE_KB = 60;
 const STATE_EVENTS_OF_INTEREST = ['m.room.create', 'm.room.name'];
+const SLIDING_SYNC_AI_ROOM_LIST_NAME = 'ai-room';
+const SLIDING_SYNC_AUTH_ROOM_LIST_NAME = 'auth-room';
+const SLIDING_SYNC_LIST_RANGE_SIZE = 2;
+const SLIDING_SYNC_LIST_TIMELINE_LIMIT = 1;
 
 const realmEventsLogger = logger('realm:events');
 
@@ -139,6 +149,12 @@ export default class MatrixService extends Service {
   @tracked private _isNewUser = false;
   @tracked private postLoginCompleted = false;
   @tracked private _currentRoomId: string | undefined;
+  @tracked private timelineLoadingState: Map<string, boolean> =
+    new TrackedMap();
+  @tracked private currentAiRoomListRange = SLIDING_SYNC_LIST_RANGE_SIZE;
+  @tracked private totalAiRooms?: number;
+  @tracked private totalAuthRooms?: number;
+  @tracked private currentAuthRoomListRange = SLIDING_SYNC_LIST_RANGE_SIZE;
 
   profile = getMatrixProfile(this, () => this.userId);
 
@@ -164,6 +180,7 @@ export default class MatrixService extends Service {
     new TrackedMap();
   private cardHashes: Map<string, string> = new Map(); // hashes <> event id
   private skillCardHashes: Map<string, string> = new Map(); // hashes <> event id
+  private slidingSync: SlidingSync | undefined;
 
   constructor(owner: Owner) {
     super(owner);
@@ -181,6 +198,7 @@ export default class MatrixService extends Service {
   set currentRoomId(value: string | undefined) {
     this._currentRoomId = value;
     if (value) {
+      this.loadAllTimelineEvents(value);
       window.localStorage.setItem(CurrentRoomIdPersistenceKey, value);
     } else {
       window.localStorage.removeItem(CurrentRoomIdPersistenceKey);
@@ -475,8 +493,9 @@ export default class MatrixService extends Service {
       this.bindEventListeners();
 
       try {
-        await this._client.startClient();
-        let accountDataContent = await this._client.getAccountDataFromServer<{
+        this.initSlidingSync();
+        await this.client.startClient({ slidingSync: this.slidingSync });
+        let accountDataContent = await this.client.getAccountDataFromServer<{
           realms: string[];
         }>(APP_BOXEL_REALMS_EVENT_TYPE);
         await this.realmServer.setAvailableRealmURLs(
@@ -498,6 +517,126 @@ export default class MatrixService extends Service {
     }
   }
 
+  private initSlidingSync() {
+    let lists: Map<string, MSC3575List> = new Map();
+    lists.set(SLIDING_SYNC_AI_ROOM_LIST_NAME, {
+      ranges: [[0, SLIDING_SYNC_LIST_RANGE_SIZE]],
+      filters: {
+        is_dm: false,
+      },
+      timeline_limit: SLIDING_SYNC_LIST_TIMELINE_LIMIT,
+      required_state: [['*', '*']],
+    });
+    lists.set(SLIDING_SYNC_AUTH_ROOM_LIST_NAME, {
+      ranges: [[0, SLIDING_SYNC_LIST_RANGE_SIZE]],
+      filters: {
+        is_dm: true,
+      },
+      timeline_limit: 1,
+      required_state: [['*', '*']],
+    });
+    this.slidingSync = new SlidingSync(
+      this.client.baseUrl,
+      lists,
+      {
+        timeline_limit: SLIDING_SYNC_LIST_TIMELINE_LIMIT,
+      },
+      this.client as any,
+      3000,
+    );
+
+    this.slidingSync.on(SlidingSyncEvent.Lifecycle, (state, response) => {
+      if (state !== SlidingSyncState.Complete || !response) {
+        return;
+      }
+
+      // Handle AI rooms
+      if (
+        response.lists[SLIDING_SYNC_AI_ROOM_LIST_NAME]?.ops?.[0].op === 'SYNC'
+      ) {
+        if (
+          response.lists?.[SLIDING_SYNC_AI_ROOM_LIST_NAME]?.count !== undefined
+        ) {
+          this.totalAiRooms =
+            response.lists[SLIDING_SYNC_AI_ROOM_LIST_NAME].count;
+          const currentRange =
+            response.lists[SLIDING_SYNC_AI_ROOM_LIST_NAME].ops?.[0]?.range;
+
+          if (currentRange) {
+            this.currentAiRoomListRange = currentRange[1];
+            this.maybeLoadMoreAiRooms.perform();
+          }
+        }
+      }
+
+      // Handle Auth rooms
+      if (
+        response.lists[SLIDING_SYNC_AUTH_ROOM_LIST_NAME]?.ops?.[0].op === 'SYNC'
+      ) {
+        if (
+          response.lists?.[SLIDING_SYNC_AUTH_ROOM_LIST_NAME]?.count !==
+          undefined
+        ) {
+          this.totalAuthRooms =
+            response.lists[SLIDING_SYNC_AUTH_ROOM_LIST_NAME].count;
+          const currentAuthRange =
+            response.lists[SLIDING_SYNC_AUTH_ROOM_LIST_NAME].ops?.[0]?.range;
+
+          if (currentAuthRange) {
+            this.currentAuthRoomListRange = currentAuthRange[1];
+            this.maybeLoadMoreAuthRooms.perform();
+          }
+        }
+      }
+    });
+
+    return this.slidingSync;
+  }
+
+  private maybeLoadMoreAiRooms = restartableTask(async () => {
+    if (!this.totalAiRooms || !this.slidingSync) {
+      return;
+    }
+
+    while (this.currentAiRoomListRange < this.totalAiRooms) {
+      const nextRange = Math.min(
+        this.currentAiRoomListRange + 2,
+        this.totalAiRooms,
+      );
+
+      try {
+        await this.slidingSync.setListRanges('ai-room', [[0, nextRange]]);
+        this.currentAiRoomListRange = nextRange;
+        await timeout(500);
+      } catch (error) {
+        console.error('Error expanding room range:', error);
+        break;
+      }
+    }
+  });
+
+  private maybeLoadMoreAuthRooms = restartableTask(async () => {
+    if (!this.totalAuthRooms || !this.slidingSync) {
+      return;
+    }
+
+    while (this.currentAuthRoomListRange < this.totalAuthRooms) {
+      const nextRange = Math.min(
+        this.currentAuthRoomListRange + 2,
+        this.totalAuthRooms,
+      );
+
+      try {
+        await this.slidingSync.setListRanges('auth-room', [[0, nextRange]]);
+        this.currentAuthRoomListRange = nextRange;
+        await timeout(500);
+      } catch (error) {
+        console.error('Error expanding auth room range:', error);
+        break;
+      }
+    }
+  });
+
   private async loginToRealms() {
     // This is where we would actually load user-specific choices out of the
     // user's profile based on this.client.getUserId();
@@ -534,7 +673,7 @@ export default class MatrixService extends Service {
       | CommandResultWithOutputContent
       | CommandDefinitionsContent,
   ) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     return roomData.mutex.dispatch(async () => {
       if ('data' in content) {
         const encodedContent = {
@@ -1008,7 +1147,7 @@ export default class MatrixService extends Service {
   }
 
   async setPowerLevel(roomId: string, userId: string, powerLevel: number) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     await roomData.mutex.dispatch(async () => {
       return this.client.setPowerLevel(roomId, userId, powerLevel);
     });
@@ -1045,7 +1184,7 @@ export default class MatrixService extends Service {
     content: Record<string, any>,
     stateKey: string = '',
   ) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     await roomData.mutex.dispatch(async () => {
       return this.client.sendStateEvent(roomId, eventType, content, stateKey);
     });
@@ -1059,7 +1198,7 @@ export default class MatrixService extends Service {
       content: Record<string, any>,
     ) => Promise<Record<string, any>>,
   ) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     await roomData.mutex.dispatch(async () => {
       let currentContent = await this.getStateEventSafe(
         roomId,
@@ -1077,21 +1216,21 @@ export default class MatrixService extends Service {
   }
 
   async leave(roomId: string) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     await roomData.mutex.dispatch(async () => {
       return this.client.leave(roomId);
     });
   }
 
   async forget(roomId: string) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     await roomData.mutex.dispatch(async () => {
       return this.client.forget(roomId);
     });
   }
 
   async setRoomName(roomId: string, name: string) {
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     await roomData.mutex.dispatch(async () => {
       return this.client.setRoomName(roomId, name);
     });
@@ -1131,11 +1270,43 @@ export default class MatrixService extends Service {
     return await this.client.isUsernameAvailable(username);
   }
 
-  async getRoomState(roomId: string) {
-    return this.client
-      .getRoom(roomId)
-      ?.getLiveTimeline()
-      .getState('f' as MatrixSDK.Direction);
+  private async loadAllTimelineEvents(roomId: string) {
+    let roomData = this.ensureRoomData(roomId);
+    let room = this.client.getRoom(roomId);
+
+    if (!room) {
+      throw new Error(`Cannot find room with id ${roomId}`);
+    }
+
+    this.timelineLoadingState.set(roomId, true);
+    try {
+      while (room.oldState.paginationToken != null) {
+        await this.client.scrollback(room);
+        await timeout(1000);
+        let rs = room.getLiveTimeline().getState('f' as MatrixSDK.Direction);
+        if (rs) {
+          roomData.notifyRoomStateUpdated(rs);
+        }
+      }
+
+      const timeline = room.getLiveTimeline();
+      const events = timeline.getEvents();
+      for (let event of events) {
+        await this.processDecryptedEvent(this.buildEventForProcessing(event));
+      }
+    } catch (error) {
+      console.error('Error loading timeline events:', error);
+      throw error;
+    } finally {
+      this.timelineLoadingState.set(roomId, false);
+    }
+  }
+
+  get isLoadingTimeline() {
+    if (!this.currentRoomId) {
+      return false;
+    }
+    return this.timelineLoadingState.get(this.currentRoomId) ?? false;
   }
 
   async sendActiveLLMEvent(roomId: string, model: string) {
@@ -1152,18 +1323,14 @@ export default class MatrixService extends Service {
         `bug: roomId is undefined for event ${JSON.stringify(event, null, 2)}`,
       );
     }
-    let roomData = await this.ensureRoomData(roomId);
+    let roomData = this.ensureRoomData(roomId);
     roomData.addEvent(event, oldEventId);
   }
 
-  private async ensureRoomData(roomId: string) {
+  private ensureRoomData(roomId: string) {
     let roomData = this.getRoomData(roomId);
     if (!roomData) {
       roomData = new Room(roomId);
-      let rs = await this.getRoomState(roomId);
-      if (rs) {
-        roomData.notifyRoomStateUpdated(rs);
-      }
       this.setRoomData(roomId, roomData);
     }
     return roomData;
@@ -1282,7 +1449,7 @@ export default class MatrixService extends Service {
     }
     roomStates = Array.from(roomStateMap.values());
     for (let rs of roomStates) {
-      let roomData = await this.ensureRoomData(rs.roomId);
+      let roomData = this.ensureRoomData(rs.roomId);
       roomData.notifyRoomStateUpdated(rs);
     }
     roomStateUpdatesDrained!();
@@ -1482,11 +1649,6 @@ export default class MatrixService extends Service {
     ) {
       this.commandService.executeCommandEventsIfNeeded(event);
     }
-
-    if (room.oldState.paginationToken != null) {
-      // we need to scroll back to capture any room events fired before this one
-      await this.client?.scrollback(room);
-    }
   }
 
   async activateCodingSkill() {

packages/host/ember-cli-build.js

@@ -86,7 +86,9 @@ module.exports = function (defaults) {
               process: false,
             },
             alias: {
-              'matrix-js-sdk': 'matrix-js-sdk/src/browser-index.ts', // Consume matrix-js-sdk via Typescript ESM so that code splitting works to exlcude massive matrix-sdk-crypto-wasm from the main bundle
+              'matrix-js-sdk$': 'matrix-js-sdk/src/browser-index.ts', // Consume matrix-js-sdk via Typescript ESM so that code splitting works to exlcude massive matrix-sdk-crypto-wasm from the main bundle
+              'matrix-js-sdk/src/sliding-sync':
+                'matrix-js-sdk/src/sliding-sync.ts',
             },
           },
           node: {

packages/matrix/docker/synapse/dev/homeserver.yaml

@@ -99,3 +99,6 @@ email:
 
 templates:
   custom_template_directory: "/custom/templates/"
+
+experimental_features:
+  msc3575_enabled: true

packages/matrix/docker/synapse/index.ts

@@ -126,7 +126,7 @@ export async function synapseStart(
   );
   await dockerCreateNetwork({ networkName: 'boxel' });
   const synapseId = await dockerRun({
-    image: 'matrixdotorg/synapse:v1.99.0rc1',
+    image: 'matrixdotorg/synapse:v1.126.0',
     containerName: 'boxel-synapse',
     dockerParams: [
       '--rm',