homebridge-aeg-robot/dist/heartbeat.js

AEG RX9 / Electrolux Pure i9 robot vacuum plugin for Homebridge

// Homebridge plugin for AEG RX 9 / Electrolux Pure i9 robot vacuum
// Copyright © 2022-2023 Alexander Thoukydides
import { setTimeout } from 'node:timers/promises';
import { MS, logError } from './utils.js';
// Multiple of interval to treat as a failure
const TIMEOUT_MULTIPLE = 3;
const TIMEOUT_OFFSET = 10 * MS;
// Perform an action periodically with error reporting and timeout
export class Heartbeat {
    log;
    name;
    interval;
    action;
    failure;
    // Abort signal used to stop a watchdog
    abortController;
    // The result of the last action
    lastError;
    // Create a new periodic action
    constructor(log, name, interval, action, failure) {
        this.log = log;
        this.name = name;
        this.interval = interval;
        this.action = action;
        this.failure = failure;
        void this.doAction();
        void this.resetWatchdog();
    }
    // Perform the action periodically indefinitely
    async doAction() {
        for (;;) {
            try {
                await this.action();
                void this.resetWatchdog();
            }
            catch (err) {
                logError(this.log, this.name, err);
                this.lastError = err;
            }
            await setTimeout(this.interval);
        }
    }
    // Reset the timeout
    async resetWatchdog() {
        try {
            // Kill any previous watchdog, indicating any previous timeout as cleared
            this.abortController?.abort();
            if (this.lastError) {
                this.lastError = undefined;
                this.failure();
            }
            // Start a new watchdog
            this.abortController = new AbortController();
            const { signal } = this.abortController;
            await setTimeout(this.interval * TIMEOUT_MULTIPLE + TIMEOUT_OFFSET, undefined, { signal });
            // The timeout has occurred, so report the failure
            this.lastError ??= new Error(`${this.name} watchdog timeout`);
            this.failure(this.lastError);
        }
        catch (cause) {
            if (cause instanceof Error && cause.name === 'AbortError')
                return;
            logError(this.log, this.name, cause);
        }
    }
}
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