56 lines
1.5 KiB
TypeScript
56 lines
1.5 KiB
TypeScript
import { SlidingWindow } from "lib/mq/slidingWindow.ts";
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export interface RateLimiterConfig {
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window: SlidingWindow;
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max: number;
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}
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export class RateLimiter {
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private readonly configs: RateLimiterConfig[];
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private readonly configEventNames: string[];
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/*
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* @param name The name of the rate limiter
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* @param configs The configuration of the rate limiter, containing:
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* - window: The sliding window to use
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* - max: The maximum number of events allowed in the window
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*/
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constructor(name: string, configs: RateLimiterConfig[]) {
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this.configs = configs;
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this.configEventNames = configs.map((_, index) => `${name}_config_${index}`);
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}
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/*
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* Check if the event has reached the rate limit
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*/
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async getAvailability(): Promise<boolean> {
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for (let i = 0; i < this.configs.length; i++) {
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const config = this.configs[i];
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const eventName = this.configEventNames[i];
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const count = await config.window.count(eventName);
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if (count >= config.max) {
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return false;
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}
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}
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return true;
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}
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/*
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* Trigger an event in the rate limiter
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*/
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async trigger(): Promise<void> {
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for (let i = 0; i < this.configs.length; i++) {
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const config = this.configs[i];
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const eventName = this.configEventNames[i];
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await config.window.event(eventName);
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}
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}
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async clear(): Promise<void> {
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for (let i = 0; i < this.configs.length; i++) {
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const config = this.configs[i];
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const eventName = this.configEventNames[i];
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await config.window.clear(eventName);
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}
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}
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} |