Method rateLimit

src/tenso.js:258–293

* Handles rate limiting for incoming requests * @param {Object} req - Request object * @param {Function} fn - Optional function to modify rate limit state * @returns {Array} Array containing [valid, limit, remaining, reset]

(req, fn)

	 * @returns {Array} Array containing [valid, limit, remaining, reset]
	 */
	rateLimit (req, fn) {
		const reqId = req.sessionID || req.ip;
		let valid = true,
			seconds = Math.floor(new Date().getTime() / INT_1000),
			limit, remaining, reset, state;

		if (this.rates.has(reqId) === false) {
			this.rates.set(reqId, {
				limit: this.rate.limit,
				remaining: this.rate.limit,
				reset: seconds + this.rate.reset,
				time_reset: this.rate.reset
			});
		}

		if (typeof fn === FUNCTION) {
			this.rates.set(reqId, fn(req, this.rates.get(reqId)));
		}

		state = this.rates.get(reqId);
		limit = state.limit;
		remaining = state.remaining;
		reset = state.reset;

		if (seconds >= reset) {
			reset = state.reset = seconds + this.rate.reset;
			remaining = state.remaining = limit - INT_1;
		} else if (remaining > INT_0) {
			state.remaining--;
			remaining = state.remaining;
		} else {
			valid = false;
		}

		return [valid, limit, remaining, reset];
	}

	/**
	 * Renders the response based on the accepted content type