helene/server/heartbeat.js

Real-time Web Apps for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Heartbeat = void 0;
class Heartbeat {
    _sendPing;
    _onTimeout;
    _seenPacket;
    _heartbeatIntervalHandle;
    _heartbeatTimeoutHandle;
    static HEARTBEAT_INTERVAL = 10000;
    constructor(options) {
        this._sendPing = options.sendPing;
        this._onTimeout = options.onTimeout;
        this._seenPacket = false;
        this._heartbeatIntervalHandle = null;
        this._heartbeatTimeoutHandle = null;
    }
    stop() {
        this._clearHeartbeatIntervalTimer();
        this._clearHeartbeatTimeoutTimer();
    }
    start() {
        this.stop();
        this._startHeartbeatIntervalTimer();
    }
    _startHeartbeatIntervalTimer() {
        this._heartbeatIntervalHandle = setInterval(() => this._heartbeatIntervalFired(), Heartbeat.HEARTBEAT_INTERVAL);
    }
    _startHeartbeatTimeoutTimer() {
        this._heartbeatTimeoutHandle = setTimeout(() => this._heartbeatTimeoutFired(), Heartbeat.HEARTBEAT_INTERVAL);
    }
    _clearHeartbeatIntervalTimer() {
        if (this._heartbeatIntervalHandle) {
            clearInterval(this._heartbeatIntervalHandle);
            this._heartbeatIntervalHandle = null;
        }
    }
    _clearHeartbeatTimeoutTimer() {
        if (this._heartbeatTimeoutHandle) {
            clearTimeout(this._heartbeatTimeoutHandle);
            this._heartbeatTimeoutHandle = null;
        }
    }
    _heartbeatIntervalFired() {
        if (!this._seenPacket && !this._heartbeatTimeoutHandle) {
            this._sendPing();
            this._startHeartbeatTimeoutTimer();
        }
        this._seenPacket = false;
    }
    _heartbeatTimeoutFired() {
        this._heartbeatTimeoutHandle = null;
        this._onTimeout();
    }
    messageReceived() {
        this._seenPacket = true;
        if (this._heartbeatTimeoutHandle) {
            this._clearHeartbeatTimeoutTimer();
        }
    }
}
exports.Heartbeat = Heartbeat;
//# sourceMappingURL=heartbeat.js.map