src/client/util/PingManager.ts


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import { action, IReactionDisposer, observable, observe, reaction } from "mobx";
import { Networking } from "../Network";
export class PingManager {
    // create static instance and getter for global use
    @observable static _instance: PingManager;
    static get Instance(): PingManager {
        return PingManager._instance;
    }

    @observable isBeating: boolean = true;
    private setIsBeating = action((status: boolean) => this.isBeating = status);

    ping = async (): Promise<void> => {
        try {
            const response = await Networking.PostToServer('/ping', { date: new Date() });
            // console.log('ping response', response, this.interval);
            !this.isBeating && this.setIsBeating(true);
        } catch {
            console.error('ping error');
            this.isBeating && this.setIsBeating(false);
        }
    }

    // not used now, but may need to clear interval
    private interval: NodeJS.Timeout | null = null;
    INTERVAL_SECONDS = 1;
    constructor() {
        PingManager._instance = this;
        this.interval = setInterval(this.ping, this.INTERVAL_SECONDS * 1000);
    }
}