element-web/src/Presence.ts
David Langley 491f0cd08a
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2024-09-09 13:57:16 +00:00

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TypeScript

/*
Copyright 2024 New Vector Ltd.
Copyright 2019 The Matrix.org Foundation C.I.C.
Copyright 2018 New Vector Ltd
Copyright 2015, 2016 OpenMarket Ltd
SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/
import { logger } from "matrix-js-sdk/src/logger";
import { SetPresence } from "matrix-js-sdk/src/matrix";
import { MatrixClientPeg } from "./MatrixClientPeg";
import dis from "./dispatcher/dispatcher";
import Timer from "./utils/Timer";
import { ActionPayload } from "./dispatcher/payloads";
// Time in ms after that a user is considered as unavailable/away
const UNAVAILABLE_TIME_MS = 3 * 60 * 1000; // 3 mins
class Presence {
private unavailableTimer: Timer | null = null;
private dispatcherRef: string | null = null;
private state: SetPresence | null = null;
/**
* Start listening the user activity to evaluate his presence state.
* Any state change will be sent to the homeserver.
*/
public async start(): Promise<void> {
this.unavailableTimer = new Timer(UNAVAILABLE_TIME_MS);
// the user_activity_start action starts the timer
this.dispatcherRef = dis.register(this.onAction);
while (this.unavailableTimer) {
try {
await this.unavailableTimer.finished();
this.setState(SetPresence.Unavailable);
} catch (e) {
/* aborted, stop got called */
}
}
}
/**
* Stop tracking user activity
*/
public stop(): void {
if (this.dispatcherRef) {
dis.unregister(this.dispatcherRef);
this.dispatcherRef = null;
}
if (this.unavailableTimer) {
this.unavailableTimer.abort();
this.unavailableTimer = null;
}
}
/**
* Get the current presence state.
* @returns {string} the presence state (see PRESENCE enum)
*/
public getState(): SetPresence | null {
return this.state;
}
private onAction = (payload: ActionPayload): void => {
if (payload.action === "user_activity") {
this.setState(SetPresence.Online);
this.unavailableTimer?.restart();
}
};
/**
* Set the presence state.
* If the state has changed, the homeserver will be notified.
* @param {string} newState the new presence state (see PRESENCE enum)
*/
private async setState(newState: SetPresence): Promise<void> {
if (newState === this.state) {
return;
}
const oldState = this.state;
this.state = newState;
if (MatrixClientPeg.safeGet().isGuest()) {
return; // don't try to set presence when a guest; it won't work.
}
try {
await MatrixClientPeg.safeGet().setSyncPresence(this.state);
logger.debug("Presence:", newState);
} catch (err) {
logger.error("Failed to set presence:", err);
this.state = oldState;
}
}
}
export default new Presence();