Run voice recording updates through a dedicated store

src/stores/VoiceRecordingStore.ts

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+/*
+Copyright 2021 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 {AsyncStoreWithClient} from "./AsyncStoreWithClient";
+import defaultDispatcher from "../dispatcher/dispatcher";
+import {ActionPayload} from "../dispatcher/payloads";
+import {VoiceRecording} from "../voice/VoiceRecording";
+
+interface IState {
+    recording?: VoiceRecording;
+}
+
+export class VoiceRecordingStore extends AsyncStoreWithClient<IState> {
+    private static internalInstance: VoiceRecordingStore;
+
+    public constructor() {
+        super(defaultDispatcher, {});
+    }
+
+    /**
+     * Gets the active recording instance, if any.
+     */
+    public get activeRecording(): VoiceRecording | null {
+        return this.state.recording;
+    }
+
+    public static get instance(): VoiceRecordingStore {
+        if (!VoiceRecordingStore.internalInstance) {
+            VoiceRecordingStore.internalInstance = new VoiceRecordingStore();
+        }
+        return VoiceRecordingStore.internalInstance;
+    }
+
+    protected async onAction(payload: ActionPayload): Promise<void> {
+        // Nothing to do, but we're required to override the function
+        return;
+    }
+
+    /**
+     * Starts a new recording if one isn't already in progress. Note that this simply
+     * creates a recording instance - whether or not recording is actively in progress
+     * can be seen via the VoiceRecording class.
+     * @returns {VoiceRecording} The recording.
+     */
+    public startRecording(): VoiceRecording {
+        if (!this.matrixClient) throw new Error("Cannot start a recording without a MatrixClient");
+        if (this.state.recording) throw new Error("A recording is already in progress");
+
+        const recording = new VoiceRecording(this.matrixClient);
+
+        // noinspection JSIgnoredPromiseFromCall - we can safely run this async
+        this.updateState({recording});
+
+        return recording;
+    }
+
+    /**
+     * Disposes of the current recording, no matter the state of it.
+     * @returns {Promise<void>} Resolves when complete.
+     */
+    public disposeRecording(): Promise<void> {
+        if (this.state.recording) {
+            // Stop for good measure, but completely async because we're not concerned with this
+            // passing or failing.
+            this.state.recording.stop().catch(e => console.error("Error stopping recording", e));
+        }
+        return this.updateState({recording: null});
+    }
+}