Voice Broadcast live state / extract RelationsHelper (#9432)

* Extract RelationsHelper

* Make RelationsHelper.relations optional

src/events/RelationsHelper.ts

@@ -0,0 +1,98 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { MatrixClient, MatrixEvent, MatrixEventEvent, RelationType } from "matrix-js-sdk/src/matrix";
+import { Relations, RelationsEvent } from "matrix-js-sdk/src/models/relations";
+import { TypedEventEmitter } from "matrix-js-sdk/src/models/typed-event-emitter";
+
+import { IDestroyable } from "../utils/IDestroyable";
+
+export enum RelationsHelperEvent {
+    Add = "add",
+}
+
+interface EventMap {
+    [RelationsHelperEvent.Add]: (event: MatrixEvent) => void;
+}
+
+/**
+ * Helper class that manages a specific event type relation for an event.
+ * Just create an instance and listen for new events for that relation.
+ * Optionally receive the current events by calling emitCurrent().
+ * Clean up everything by calling destroy().
+ */
+export class RelationsHelper
+    extends TypedEventEmitter<RelationsHelperEvent, EventMap>
+    implements IDestroyable {
+    private relations?: Relations;
+
+    public constructor(
+        private event: MatrixEvent,
+        private relationType: RelationType,
+        private relationEventType: string,
+        private client: MatrixClient,
+    ) {
+        super();
+        this.setUpRelations();
+    }
+
+    private setUpRelations = (): void => {
+        this.setRelations();
+
+        if (this.relations) {
+            this.relations.on(RelationsEvent.Add, this.onRelationsAdd);
+        } else {
+            this.event.once(MatrixEventEvent.RelationsCreated, this.onRelationsCreated);
+        }
+    };
+
+    private onRelationsCreated = (): void => {
+        this.setRelations();
+
+        if (this.relations) {
+            this.relations.on(RelationsEvent.Add, this.onRelationsAdd);
+            this.emitCurrent();
+        } else {
+            this.event.once(MatrixEventEvent.RelationsCreated, this.onRelationsCreated);
+        }
+    };
+
+    private setRelations(): void {
+        const room = this.client.getRoom(this.event.getRoomId());
+        this.relations = room?.getUnfilteredTimelineSet()?.relations?.getChildEventsForEvent(
+            this.event.getId(),
+            this.relationType,
+            this.relationEventType,
+        );
+    }
+
+    private onRelationsAdd = (event: MatrixEvent): void => {
+        this.emit(RelationsHelperEvent.Add, event);
+    };
+
+    public emitCurrent(): void {
+        this.relations?.getRelations()?.forEach(e => this.emit(RelationsHelperEvent.Add, e));
+    }
+
+    public destroy(): void {
+        this.removeAllListeners();
+        this.event.off(MatrixEventEvent.RelationsCreated, this.onRelationsCreated);
+
+        if (this.relations) {
+            this.relations.off(RelationsEvent.Add, this.onRelationsAdd);
+        }
+    }
+}

src/voice-broadcast/components/molecules/VoiceBroadcastPlaybackBody.tsx

@@ -31,6 +31,7 @@ export const VoiceBroadcastPlaybackBody: React.FC<VoiceBroadcastPlaybackBodyProp
     playback,
 }) => {
     const {
+        live,
         room,
         sender,
         toggle,
@@ -40,7 +41,7 @@ export const VoiceBroadcastPlaybackBody: React.FC<VoiceBroadcastPlaybackBodyProp
     return (
         <div className="mx_VoiceBroadcastPlaybackBody">
             <VoiceBroadcastHeader
-                live={false}
+                live={live}
                 sender={sender}
                 room={room}
                 showBroadcast={true}

src/voice-broadcast/hooks/useVoiceBroadcastPlayback.ts

@@ -19,6 +19,7 @@ import { useState } from "react";
 import { useTypedEventEmitter } from "../../hooks/useEventEmitter";
 import { MatrixClientPeg } from "../../MatrixClientPeg";
 import {
+    VoiceBroadcastInfoState,
     VoiceBroadcastPlayback,
     VoiceBroadcastPlaybackEvent,
     VoiceBroadcastPlaybackState,
@@ -40,7 +41,17 @@ export const useVoiceBroadcastPlayback = (playback: VoiceBroadcastPlayback) => {
         },
     );
 
+    const [playbackInfoState, setPlaybackInfoState] = useState(playback.getInfoState());
+    useTypedEventEmitter(
+        playback,
+        VoiceBroadcastPlaybackEvent.InfoStateChanged,
+        (state: VoiceBroadcastInfoState) => {
+            setPlaybackInfoState(state);
+        },
+    );
+
     return {
+        live: playbackInfoState !== VoiceBroadcastInfoState.Stopped,
         room: room,
         sender: playback.infoEvent.sender,
         toggle: playbackToggle,

src/voice-broadcast/models/VoiceBroadcastPlayback.ts

@@ -18,20 +18,19 @@ import {
     EventType,
     MatrixClient,
     MatrixEvent,
-    MatrixEventEvent,
     MsgType,
     RelationType,
 } from "matrix-js-sdk/src/matrix";
-import { Relations, RelationsEvent } from "matrix-js-sdk/src/models/relations";
 import { TypedEventEmitter } from "matrix-js-sdk/src/models/typed-event-emitter";
 
 import { Playback, PlaybackState } from "../../audio/Playback";
 import { PlaybackManager } from "../../audio/PlaybackManager";
-import { getReferenceRelationsForEvent } from "../../events";
 import { UPDATE_EVENT } from "../../stores/AsyncStore";
 import { MediaEventHelper } from "../../utils/MediaEventHelper";
 import { IDestroyable } from "../../utils/IDestroyable";
-import { VoiceBroadcastChunkEventType } from "..";
+import { VoiceBroadcastChunkEventType, VoiceBroadcastInfoEventType, VoiceBroadcastInfoState } from "..";
+import { RelationsHelper, RelationsHelperEvent } from "../../events/RelationsHelper";
+import { getReferenceRelationsForEvent } from "../../events";
 
 export enum VoiceBroadcastPlaybackState {
     Paused,
@@ -42,29 +41,55 @@ export enum VoiceBroadcastPlaybackState {
 export enum VoiceBroadcastPlaybackEvent {
     LengthChanged = "length_changed",
     StateChanged = "state_changed",
+    InfoStateChanged = "info_state_changed",
 }
 
 interface EventMap {
     [VoiceBroadcastPlaybackEvent.LengthChanged]: (length: number) => void;
     [VoiceBroadcastPlaybackEvent.StateChanged]: (state: VoiceBroadcastPlaybackState) => void;
+    [VoiceBroadcastPlaybackEvent.InfoStateChanged]: (state: VoiceBroadcastInfoState) => void;
 }
 
 export class VoiceBroadcastPlayback
     extends TypedEventEmitter<VoiceBroadcastPlaybackEvent, EventMap>
     implements IDestroyable {
     private state = VoiceBroadcastPlaybackState.Stopped;
+    private infoState: VoiceBroadcastInfoState;
     private chunkEvents = new Map<string, MatrixEvent>();
-    /** Holds the playback qeue with a 1-based index (sequence number) */
+    /** Holds the playback queue with a 1-based index (sequence number) */
     private queue: Playback[] = [];
     private currentlyPlaying: Playback;
-    private relations: Relations;
+    private lastInfoEvent: MatrixEvent;
+    private chunkRelationHelper: RelationsHelper;
+    private infoRelationHelper: RelationsHelper;
 
     public constructor(
         public readonly infoEvent: MatrixEvent,
         private client: MatrixClient,
     ) {
         super();
-        this.setUpRelations();
+        this.addInfoEvent(this.infoEvent);
+        this.setUpRelationsHelper();
+    }
+
+    private setUpRelationsHelper(): void {
+        this.infoRelationHelper = new RelationsHelper(
+            this.infoEvent,
+            RelationType.Reference,
+            VoiceBroadcastInfoEventType,
+            this.client,
+        );
+        this.infoRelationHelper.on(RelationsHelperEvent.Add, this.addInfoEvent);
+        this.infoRelationHelper.emitCurrent();
+
+        this.chunkRelationHelper = new RelationsHelper(
+            this.infoEvent,
+            RelationType.Reference,
+            EventType.RoomMessage,
+            this.client,
+        );
+        this.chunkRelationHelper.on(RelationsHelperEvent.Add, this.addChunkEvent);
+        this.chunkRelationHelper.emitCurrent();
     }
 
     private addChunkEvent(event: MatrixEvent): boolean {
@@ -81,41 +106,21 @@ export class VoiceBroadcastPlayback
         return true;
     }
 
-    private setUpRelations(): void {
-        const relations = getReferenceRelationsForEvent(this.infoEvent, EventType.RoomMessage, this.client);
-
-        if (!relations) {
-            // No related events, yet. Set up relation watcher.
-            this.infoEvent.on(MatrixEventEvent.RelationsCreated, this.onRelationsCreated);
+    private addInfoEvent = (event: MatrixEvent): void => {
+        if (this.lastInfoEvent && this.lastInfoEvent.getTs() >= event.getTs()) {
+            // Only handle newer events
             return;
         }
 
-        this.relations = relations;
-        relations.getRelations()?.forEach(e => this.addChunkEvent(e));
-        relations.on(RelationsEvent.Add, this.onRelationsEventAdd);
+        const state = event.getContent()?.state;
 
-        if (this.chunkEvents.size > 0) {
-            this.emitLengthChanged();
-        }
-    }
-
-    private onRelationsEventAdd = (event: MatrixEvent) => {
-        if (this.addChunkEvent(event)) {
-            this.emitLengthChanged();
-        }
-    };
-
-    private emitLengthChanged(): void {
-        this.emit(VoiceBroadcastPlaybackEvent.LengthChanged, this.chunkEvents.size);
-    }
-
-    private onRelationsCreated = (relationType: string) => {
-        if (relationType !== RelationType.Reference) {
+        if (!Object.values(VoiceBroadcastInfoState).includes(state)) {
+            // Do not handle unknown voice broadcast states
             return;
         }
 
-        this.infoEvent.off(MatrixEventEvent.RelationsCreated, this.onRelationsCreated);
-        this.setUpRelations();
+        this.lastInfoEvent = event;
+        this.setInfoState(state);
     };
 
     private async loadChunks(): Promise<void> {
@@ -173,7 +178,7 @@ export class VoiceBroadcastPlayback
         }
 
         this.setState(VoiceBroadcastPlaybackState.Playing);
-        // index of the first schunk is the first sequence number
+        // index of the first chunk is the first sequence number
         const first = this.queue[1];
         this.currentlyPlaying = first;
         await first.play();
@@ -238,17 +243,27 @@ export class VoiceBroadcastPlayback
         this.emit(VoiceBroadcastPlaybackEvent.StateChanged, state);
     }
 
+    public getInfoState(): VoiceBroadcastInfoState {
+        return this.infoState;
+    }
+
+    private setInfoState(state: VoiceBroadcastInfoState): void {
+        if (this.infoState === state) {
+            return;
+        }
+
+        this.infoState = state;
+        this.emit(VoiceBroadcastPlaybackEvent.InfoStateChanged, state);
+    }
+
     private destroyQueue(): void {
         this.queue.forEach(p => p.destroy());
         this.queue = [];
     }
 
     public destroy(): void {
-        if (this.relations) {
-            this.relations.off(RelationsEvent.Add, this.onRelationsEventAdd);
-        }
-
-        this.infoEvent.off(MatrixEventEvent.RelationsCreated, this.onRelationsCreated);
+        this.chunkRelationHelper.destroy();
+        this.infoRelationHelper.destroy();
         this.removeAllListeners();
         this.destroyQueue();
     }

test/events/RelationsHelper-test.ts

@@ -0,0 +1,150 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { mocked } from "jest-mock";
+import {
+    EventTimelineSet,
+    EventType,
+    MatrixClient,
+    MatrixEvent,
+    MatrixEventEvent,
+    RelationType,
+    Room,
+} from "matrix-js-sdk/src/matrix";
+import { Relations } from "matrix-js-sdk/src/models/relations";
+import { RelationsContainer } from "matrix-js-sdk/src/models/relations-container";
+
+import { RelationsHelper, RelationsHelperEvent } from "../../src/events/RelationsHelper";
+import { mkEvent, mkStubRoom, stubClient } from "../test-utils";
+
+describe("RelationsHelper", () => {
+    const roomId = "!room:example.com";
+    let event: MatrixEvent;
+    let relatedEvent1: MatrixEvent;
+    let relatedEvent2: MatrixEvent;
+    let room: Room;
+    let client: MatrixClient;
+    let relationsHelper: RelationsHelper;
+    let onAdd: (event: MatrixEvent) => void;
+    let timelineSet: EventTimelineSet;
+    let relationsContainer: RelationsContainer;
+    let relations: Relations;
+    let relationsOnAdd: (event: MatrixEvent) => void;
+
+    beforeEach(() => {
+        client = stubClient();
+        room = mkStubRoom(roomId, "test room", client);
+        mocked(client.getRoom).mockImplementation((getRoomId: string) => {
+            if (getRoomId === roomId) {
+                return room;
+            }
+        });
+        event = mkEvent({
+            event: true,
+            type: EventType.RoomMessage,
+            room: roomId,
+            user: client.getUserId(),
+            content: {},
+        });
+        relatedEvent1 = mkEvent({
+            event: true,
+            type: EventType.RoomMessage,
+            room: roomId,
+            user: client.getUserId(),
+            content: {},
+        });
+        relatedEvent2 = mkEvent({
+            event: true,
+            type: EventType.RoomMessage,
+            room: roomId,
+            user: client.getUserId(),
+            content: {},
+        });
+        onAdd = jest.fn();
+        // TODO Michael W: create test utils, remove casts
+        relationsContainer = {
+            getChildEventsForEvent: jest.fn(),
+        } as unknown as RelationsContainer;
+        relations = {
+            getRelations: jest.fn(),
+            on: jest.fn().mockImplementation((type, l) => relationsOnAdd = l),
+        } as unknown as Relations;
+        timelineSet = {
+            relations: relationsContainer,
+        } as unknown as EventTimelineSet;
+    });
+
+    describe("when there is an event without relations", () => {
+        beforeEach(() => {
+            relationsHelper = new RelationsHelper(event, RelationType.Reference, EventType.RoomMessage, client);
+            relationsHelper.on(RelationsHelperEvent.Add, onAdd);
+        });
+
+        describe("emitCurrent", () => {
+            beforeEach(() => {
+                relationsHelper.emitCurrent();
+            });
+
+            it("should not emit any event", () => {
+                expect(onAdd).not.toHaveBeenCalled();
+            });
+        });
+
+        describe("and relations are created and a new event appears", () => {
+            beforeEach(() => {
+                mocked(room.getUnfilteredTimelineSet).mockReturnValue(timelineSet);
+                mocked(relationsContainer.getChildEventsForEvent).mockReturnValue(relations);
+                mocked(relations.getRelations).mockReturnValue([relatedEvent1]);
+                event.emit(MatrixEventEvent.RelationsCreated, RelationType.Reference, EventType.RoomMessage);
+                relationsOnAdd(relatedEvent2);
+            });
+
+            it("should emit the new event", () => {
+                expect(onAdd).toHaveBeenCalledWith(relatedEvent2);
+            });
+        });
+    });
+
+    describe("when there is an event with relations", () => {
+        beforeEach(() => {
+            mocked(room.getUnfilteredTimelineSet).mockReturnValue(timelineSet);
+            mocked(relationsContainer.getChildEventsForEvent).mockReturnValue(relations);
+            mocked(relations.getRelations).mockReturnValue([relatedEvent1]);
+            relationsHelper = new RelationsHelper(event, RelationType.Reference, EventType.RoomMessage, client);
+            relationsHelper.on(RelationsHelperEvent.Add, onAdd);
+        });
+
+        describe("emitCurrent", () => {
+            beforeEach(() => {
+                relationsHelper.emitCurrent();
+            });
+
+            it("should emit the related event", () => {
+                expect(onAdd).toHaveBeenCalledWith(relatedEvent1);
+            });
+        });
+
+        describe("and a new event appears", () => {
+            beforeEach(() => {
+                relationsOnAdd(relatedEvent2);
+            });
+
+            it("should emit the new event", () => {
+                expect(onAdd).toHaveBeenCalledWith(relatedEvent2);
+            });
+        });
+    });
+});

test/voice-broadcast/components/molecules/__snapshots__/VoiceBroadcastPlaybackBody-test.tsx.snap

@@ -45,6 +45,17 @@ exports[`VoiceBroadcastPlaybackBody when rendering a broadcast should render as
           Voice broadcast
         </div>
       </div>
+      <div
+        class="mx_LiveBadge"
+      >
+        <i
+          aria-hidden="true"
+          class="mx_Icon mx_Icon_16 mx_Icon_live-badge"
+          role="presentation"
+          style="mask-image: url(\\"image-file-stub\\");"
+        />
+        Live
+      </div>
     </div>
     <div
       class="mx_VoiceBroadcastPlaybackBody_controls"