Method init

src/tenso.js:161–238

* Initializes the Tenso server with middleware, routes, and configuration * @returns {Tenso} The Tenso instance for method chaining

()

	 * @returns {Tenso} The Tenso instance for method chaining
	 */
	init () {
		const authorization = Object.keys(this.auth).filter(i => this.auth?.[i]?.enabled === true).length > INT_0 || this.rate.enabled || this.security.csrf;

		// Matching MaxListeners for signals
		this.setMaxListeners(this.maxListeners);
		process.setMaxListeners(this.maxListeners);

		this.decorate = this.decorate.bind(this);
		this.route = this.route.bind(this);
		this.render = this.render.bind(this);
		this.signals();
		this.addListener(CONNECT, this.connect.bind(this));
		this.onSend = (req, res, body = EMPTY, status = INT_200, headers) => {
			this.headers(req, res);
			res.statusCode = status;

			if (status !== INT_204 && status !== INT_304 && (body === null || typeof body.on !== FUNCTION)) {
				for (const fn of [serialize, hypermedia, this.final, this.render]) {
					body = fn(req, res, body);
				}
			}

			return [body, status, headers];
		};

		// Prometheus metrics
		if (this.prometheus.enabled) {
			const {middleware, register} = prometheus(this.prometheus.metrics);

			this.log(`type=init, message"${MSG_PROMETHEUS_ENABLED}"`);
			this.always(middleware).ignore(middleware);

			// Registering a route for metrics endpoint
			this.get(METRICS_PATH, (req, res) => {
				res.header(HEADER_CONTENT_TYPE, register.contentType);
				register.metrics().then(result => res.end(result)).catch(err => {
					res.statusCode = INT_500;
					res.end(`Error collecting metrics: ${err.message}`);
				});
			});
		}

		// Early exit after prometheus metrics (for GETs only)
		this.always(exit).ignore(exit);

		// Payload handling
		this.always(payload).ignore(payload);
		this.always(parse).ignore(parse);

		// Setting 'always' routes before authorization runs
		for (const [key, value] of Object.entries(this.initRoutes.always ?? {})) {
			if (typeof value === FUNCTION) {
				this.always(key, value).ignore(value);
			}
		}

		delete this.initRoutes.always;