65 lines
2.3 KiB
JavaScript
65 lines
2.3 KiB
JavaScript
import Limiter from "ratelimiter";
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import Logger from "../../services/logger.js";
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import { redisClient } from "../../db/redis.js";
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import { convertMilliseconds } from "../../misc/convert-milliseconds.js";
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const logger = new Logger("limiter");
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export const limiter = (limitation, actor)=>new Promise((ok, reject)=>{
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if (process.env.NODE_ENV === "test") ok();
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const hasShortTermLimit = typeof limitation.minInterval === "number";
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const hasLongTermLimit = typeof limitation.duration === "number" && typeof limitation.max === "number";
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if (hasShortTermLimit) {
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min();
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} else if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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// Short-term limit
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function min() {
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const minIntervalLimiter = new Limiter({
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id: `${actor}:${limitation.key}:min`,
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duration: limitation.minInterval,
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max: 1,
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db: redisClient
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});
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minIntervalLimiter.get((err, info)=>{
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if (err) {
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return reject("ERR");
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}
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logger.debug(`${actor} ${limitation.key} min remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject("BRIEF_REQUEST_INTERVAL");
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} else {
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if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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}
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});
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}
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// Long term limit
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function max() {
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const limiter = new Limiter({
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id: `${actor}:${limitation.key}`,
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duration: limitation.duration,
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max: limitation.max,
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db: redisClient
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});
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limiter.get((err, info)=>{
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if (err) {
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return reject("ERR");
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}
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logger.debug(`${actor} ${limitation.key} max remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject({
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message: "RATE_LIMIT_EXCEEDED",
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remainingTime: convertMilliseconds(info.resetMs - Date.now())
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});
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} else {
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ok();
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}
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});
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}
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});
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