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Tweaks to RegExpRunner

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Dragory 2020-08-05 02:36:09 +03:00
parent f71c0c076a
commit c6158adc38
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1 changed files with 27 additions and 6 deletions
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33
backend/src/RegExpRunner.ts
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@ -1,7 +1,8 @@
import { RegExpWorker, TimeoutError } from "regexp-worker";
import { CooldownManager } from "knub";
import { MINUTES } from "./utils";
import { MINUTES, SECONDS } from "./utils";
import { EventEmitter } from "events";
import Timeout = NodeJS.Timeout;
const isTimeoutError = (a): a is TimeoutError => {
return a.message != null && a.elapsedTimeMs != null;
@ -21,11 +22,21 @@ export function allowTimeout(err: RegExpTimeoutError | Error) {
throw err;
}
const REGEX_TIMEOUT = 250; // ms
// Regex timeout starts at a higher value while the bot loads initially, and gets lowered afterwards
const INITIAL_REGEX_TIMEOUT = 750; // ms
const INITIAL_REGEX_TIMEOUT_DURATION = 30 * SECONDS;
const FINAL_REGEX_TIMEOUT = 250; // ms
const REGEX_FAIL_TO_COOLDOWN_COUNT = 3; // If a regex fails this many times, it goes on cooldown...
const regexTimeoutUpgradePromise = new Promise(resolve => setTimeout(resolve, INITIAL_REGEX_TIMEOUT_DURATION));
let newWorkerTimeout = INITIAL_REGEX_TIMEOUT;
regexTimeoutUpgradePromise.then(() => (newWorkerTimeout = FINAL_REGEX_TIMEOUT));
const REGEX_FAIL_TO_COOLDOWN_COUNT = 3; // If a regex times out this many times, it goes on cooldown...
const REGEX_FAIL_COOLDOWN = 5 * MINUTES; // ...for this long
const REGEX_FAIL_DECAY_TIME = 5 * MINUTES; // Interval time to decrement all fail counters by 1
export interface RegExpRunner {
on(event: "timeout", listener: (regexSource: string, timeoutMs: number) => void);
on(event: "repeatedTimeout", listener: (regexSource: string, timeoutMs: number, failTimes: number) => void);
@ -37,6 +48,7 @@ export interface RegExpRunner {
*/
export class RegExpRunner extends EventEmitter {
private _worker: RegExpWorker;
private _failedTimesInterval: Timeout;
private cooldown: CooldownManager;
private failedTimes: Map<string, number>;
@ -45,11 +57,19 @@ export class RegExpRunner extends EventEmitter {
super();
this.cooldown = new CooldownManager();
this.failedTimes = new Map();
this._failedTimesInterval = setInterval(() => {
for (const [pattern, times] of this.failedTimes.entries()) {
this.failedTimes.set(pattern, times - 1);
}
}, REGEX_FAIL_DECAY_TIME);
}
private get worker(): RegExpWorker {
if (!this._worker) {
this._worker = new RegExpWorker(REGEX_TIMEOUT);
this._worker = new RegExpWorker(newWorkerTimeout);
if (newWorkerTimeout !== FINAL_REGEX_TIMEOUT) {
regexTimeoutUpgradePromise.then(() => (this._worker.timeout = FINAL_REGEX_TIMEOUT));
}
}
return this._worker;
@ -77,10 +97,10 @@ export class RegExpRunner extends EventEmitter {
// Regex has failed too many times, set it on cooldown
this.cooldown.setCooldown(regex.source, REGEX_FAIL_COOLDOWN);
this.failedTimes.delete(regex.source);
this.emit("repeatedTimeout", regex.source, REGEX_TIMEOUT, REGEX_FAIL_TO_COOLDOWN_COUNT);
this.emit("repeatedTimeout", regex.source, this.worker.timeout, REGEX_FAIL_TO_COOLDOWN_COUNT);
}
this.emit("timeout", regex.source, REGEX_TIMEOUT);
this.emit("timeout", regex.source, this.worker.timeout);
throw new RegExpTimeoutError(e.message, e.elapsedTimeMs);
}
@ -92,5 +112,6 @@ export class RegExpRunner extends EventEmitter {
public async dispose() {
await this.worker.dispose();
this._worker = null;
clearInterval(this._failedTimesInterval);
}
}