Support dynamic room predecessors in OwnBeaconStore (#10339)

* Support dynamic room predecessors in OwnBeaconStore

* Fix type of dynamicWatcherRef

* Mock a function missing from client

src/stores/OwnBeaconStore.ts

@@ -43,6 +43,7 @@ import {
 } from "../utils/beacon";
 import { getCurrentPosition } from "../utils/beacon";
 import { doMaybeLocalRoomAction } from "../utils/local-room";
+import SettingsStore from "../settings/SettingsStore";
 
 const isOwnBeacon = (beacon: Beacon, userId: string): boolean => beacon.beaconInfoOwner === userId;
 
@@ -119,6 +120,10 @@ export class OwnBeaconStore extends AsyncStoreWithClient<OwnBeaconStoreState> {
      * when the target is stationary
      */
     private lastPublishedPositionTimestamp?: number;
+    /**
+     * Ref returned from watchSetting for the MSC3946 labs flag
+     */
+    private dynamicWatcherRef: string | undefined;
 
     public constructor() {
         super(defaultDispatcher);
@@ -142,7 +147,12 @@ export class OwnBeaconStore extends AsyncStoreWithClient<OwnBeaconStoreState> {
         this.matrixClient.removeListener(BeaconEvent.Update, this.onUpdateBeacon);
         this.matrixClient.removeListener(BeaconEvent.Destroy, this.onDestroyBeacon);
         this.matrixClient.removeListener(RoomStateEvent.Members, this.onRoomStateMembers);
+        SettingsStore.unwatchSetting(this.dynamicWatcherRef ?? "");
 
+        this.clearBeacons();
+    }
+
+    private clearBeacons(): void {
         this.beacons.forEach((beacon) => beacon.destroy());
 
         this.stopPollingLocation();
@@ -159,6 +169,11 @@ export class OwnBeaconStore extends AsyncStoreWithClient<OwnBeaconStoreState> {
         this.matrixClient.on(BeaconEvent.Update, this.onUpdateBeacon);
         this.matrixClient.on(BeaconEvent.Destroy, this.onDestroyBeacon);
         this.matrixClient.on(RoomStateEvent.Members, this.onRoomStateMembers);
+        this.dynamicWatcherRef = SettingsStore.watchSetting(
+            "feature_dynamic_room_predecessors",
+            null,
+            this.reinitialiseBeaconState,
+        );
 
         this.initialiseBeaconState();
     }
@@ -308,9 +323,19 @@ export class OwnBeaconStore extends AsyncStoreWithClient<OwnBeaconStoreState> {
         );
     }
 
+    /**
+     * @internal public for test only
+     */
+    public reinitialiseBeaconState = (): void => {
+        this.clearBeacons();
+        this.initialiseBeaconState();
+    };
+
     private initialiseBeaconState = (): void => {
         const userId = this.matrixClient.getUserId()!;
-        const visibleRooms = this.matrixClient.getVisibleRooms();
+        const visibleRooms = this.matrixClient.getVisibleRooms(
+            SettingsStore.getValue("feature_dynamic_room_predecessors"),
+        );
 
         visibleRooms.forEach((room) => {
             const roomState = room.currentState;

test/components/views/beacon/RoomLiveShareWarning-test.tsx

@@ -44,6 +44,7 @@ describe("<RoomLiveShareWarning />", () => {
         getUserId: jest.fn().mockReturnValue(aliceId),
         unstable_setLiveBeacon: jest.fn().mockResolvedValue({ event_id: "1" }),
         sendEvent: jest.fn(),
+        isGuest: jest.fn().mockReturnValue(false),
     });
 
     // 14.03.2022 16:15

test/stores/OwnBeaconStore-test.ts

@@ -38,6 +38,7 @@ import {
 } from "../test-utils";
 import { makeBeaconInfoEvent, mockGeolocation, watchPositionMockImplementation } from "../test-utils/beacon";
 import { getMockClientWithEventEmitter } from "../test-utils/client";
+import SettingsStore from "../../src/settings/SettingsStore";
 
 // modern fake timers and lodash.debounce are a faff
 // short circuit it
@@ -62,6 +63,7 @@ describe("OwnBeaconStore", () => {
         unstable_setLiveBeacon: jest.fn().mockResolvedValue({ event_id: "1" }),
         sendEvent: jest.fn().mockResolvedValue({ event_id: "1" }),
         unstable_createLiveBeacon: jest.fn().mockResolvedValue({ event_id: "1" }),
+        isGuest: jest.fn().mockReturnValue(false),
     });
     const room1Id = "$room1:server.org";
     const room2Id = "$room2:server.org";
@@ -1204,4 +1206,41 @@ describe("OwnBeaconStore", () => {
             expect(mockClient.unstable_createLiveBeacon).toHaveBeenCalledWith(room1Id, content);
         });
     });
+
+    describe("If the feature_dynamic_room_predecessors is not enabled", () => {
+        beforeEach(() => {
+            jest.spyOn(SettingsStore, "getValue").mockReturnValue(false);
+        });
+
+        it("Passes through the dynamic predecessor setting", async () => {
+            mockClient.getVisibleRooms.mockReset();
+            mockClient.getVisibleRooms.mockReturnValue([]);
+            await makeOwnBeaconStore();
+            expect(mockClient.getVisibleRooms).toHaveBeenCalledWith(false);
+        });
+    });
+
+    describe("If the feature_dynamic_room_predecessors is enabled", () => {
+        beforeEach(() => {
+            // Turn on feature_dynamic_room_predecessors setting
+            jest.spyOn(SettingsStore, "getValue").mockImplementation(
+                (settingName) => settingName === "feature_dynamic_room_predecessors",
+            );
+        });
+
+        it("Passes through the dynamic predecessor setting", async () => {
+            mockClient.getVisibleRooms.mockReset();
+            mockClient.getVisibleRooms.mockReturnValue([]);
+            await makeOwnBeaconStore();
+            expect(mockClient.getVisibleRooms).toHaveBeenCalledWith(true);
+        });
+
+        it("Passes through the dynamic predecessor when reinitialised", async () => {
+            const store = await makeOwnBeaconStore();
+            mockClient.getVisibleRooms.mockReset();
+            mockClient.getVisibleRooms.mockReturnValue([]);
+            store.reinitialiseBeaconState();
+            expect(mockClient.getVisibleRooms).toHaveBeenCalledWith(true);
+        });
+    });
 });