414 lines
12 KiB
TypeScript
414 lines
12 KiB
TypeScript
// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import * as z from 'zod';
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import { MINUTE } from '../util/durations';
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import {
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explodePromise,
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type ExplodePromiseResultType,
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} from '../util/explodePromise';
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import { clearTimeoutIfNecessary } from '../util/clearTimeoutIfNecessary';
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import { drop } from '../util/drop';
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import * as log from '../logging/log';
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import { missingCaseError } from '../util/missingCaseError';
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import {
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type ExponentialBackoffOptionsType,
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exponentialBackoffSleepTime,
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} from '../util/exponentialBackoff';
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import * as Errors from '../types/errors';
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export type JobManagerJobType = {
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active: boolean;
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attempts: number;
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retryAfter: number | null;
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lastAttemptTimestamp: number | null;
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};
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export const jobManagerJobSchema = z.object({
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attempts: z.number(),
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active: z.boolean(),
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retryAfter: z.number().nullable(),
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lastAttemptTimestamp: z.number().nullable(),
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}) satisfies z.ZodType<JobManagerJobType>;
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export type JobManagerParamsType<
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CoreJobType,
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JobType = CoreJobType & JobManagerJobType,
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> = {
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markAllJobsInactive: () => Promise<void>;
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getNextJobs: (options: {
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limit: number;
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timestamp: number;
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}) => Promise<Array<JobType>>;
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saveJob: (
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job: JobType,
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options?: { allowBatching?: boolean }
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) => Promise<void>;
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removeJob: (job: JobType) => Promise<void>;
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runJob: (
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job: JobType,
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isLastAttempt: boolean
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) => Promise<JobManagerJobResultType<CoreJobType>>;
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shouldHoldOffOnStartingQueuedJobs?: () => boolean;
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getJobId: (job: CoreJobType) => string;
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getJobIdForLogging: (job: JobType) => string;
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getRetryConfig: (job: JobType) => {
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maxAttempts: number;
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backoffConfig: ExponentialBackoffOptionsType;
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};
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maxConcurrentJobs: number;
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};
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const DEFAULT_TICK_INTERVAL = MINUTE;
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export type JobManagerJobResultType<CoreJobType> =
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| {
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status: 'retry';
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}
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| { status: 'finished'; newJob?: CoreJobType }
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| { status: 'rate-limited'; pauseDurationMs: number };
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export abstract class JobManager<CoreJobType> {
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private enabled: boolean = false;
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private activeJobs: Map<
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string,
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{
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completionPromise: ExplodePromiseResultType<void>;
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job: CoreJobType & JobManagerJobType;
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}
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> = new Map();
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private jobStartPromises: Map<string, ExplodePromiseResultType<void>> =
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new Map();
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private jobCompletePromises: Map<string, ExplodePromiseResultType<void>> =
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new Map();
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private tickTimeout: NodeJS.Timeout | null = null;
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private idleCallbacks = new Array<() => void>();
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protected logPrefix = 'JobManager';
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public tickInterval = DEFAULT_TICK_INTERVAL;
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constructor(readonly params: JobManagerParamsType<CoreJobType>) {}
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async start(): Promise<void> {
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log.info(`${this.logPrefix}: starting`);
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this.enabled = true;
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await this.params.markAllJobsInactive();
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await this.maybeStartJobs();
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this.tick();
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}
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async stop(): Promise<void> {
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const activeJobs = [...this.activeJobs.values()];
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log.info(
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`${this.logPrefix}: stopping. There are ` +
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`${activeJobs.length} active job(s)`
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);
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this.enabled = false;
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clearTimeoutIfNecessary(this.tickTimeout);
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this.tickTimeout = null;
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await Promise.all(
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activeJobs.map(({ completionPromise }) => completionPromise.promise)
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);
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}
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async waitForIdle(): Promise<void> {
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if (this.activeJobs.size === 0) {
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return;
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}
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await new Promise<void>(resolve => this.idleCallbacks.push(resolve));
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}
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private tick(): void {
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clearTimeoutIfNecessary(this.tickTimeout);
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this.tickTimeout = null;
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drop(this.maybeStartJobs());
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this.tickTimeout = setTimeout(() => this.tick(), this.tickInterval);
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}
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private pauseForDuration(durationMs: number): void {
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this.enabled = false;
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clearTimeoutIfNecessary(this.tickTimeout);
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this.tickTimeout = setTimeout(() => {
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this.enabled = true;
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this.tick();
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}, durationMs);
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}
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// used in testing
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waitForJobToBeStarted(
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job: CoreJobType & Pick<JobManagerJobType, 'attempts'>
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): Promise<void> {
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const id = this.getJobIdIncludingAttempts(job);
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const existingPromise = this.jobStartPromises.get(id)?.promise;
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if (existingPromise) {
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return existingPromise;
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}
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const { promise, resolve, reject } = explodePromise<void>();
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this.jobStartPromises.set(id, { promise, resolve, reject });
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return promise;
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}
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waitForJobToBeCompleted(
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job: CoreJobType & Pick<JobManagerJobType, 'attempts'>
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): Promise<void> {
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const id = this.getJobIdIncludingAttempts(job);
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const existingPromise = this.jobCompletePromises.get(id)?.promise;
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if (existingPromise) {
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return existingPromise;
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}
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const { promise, resolve, reject } = explodePromise<void>();
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this.jobCompletePromises.set(id, { promise, resolve, reject });
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return promise;
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}
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async addJob(newJob: CoreJobType): Promise<void> {
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await this._addJob(newJob);
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}
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// Protected methods
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protected async _addJob(
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newJob: CoreJobType,
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options?: { forceStart: boolean }
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): Promise<{ isAlreadyRunning: boolean }> {
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const job: CoreJobType & JobManagerJobType = {
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...newJob,
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attempts: 0,
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retryAfter: null,
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lastAttemptTimestamp: null,
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active: false,
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};
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const logId = this.params.getJobIdForLogging(job);
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try {
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const runningJob = this.getRunningJob(job);
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if (runningJob) {
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log.info(`${logId}: already running; resetting attempts`);
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runningJob.attempts = 0;
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await this.params.saveJob({
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...runningJob,
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attempts: 0,
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});
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return { isAlreadyRunning: true };
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}
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// Allow batching of all saves except those that we will start immediately
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await this.params.saveJob(job, { allowBatching: !options?.forceStart });
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if (options?.forceStart) {
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if (!this.enabled) {
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log.warn(
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`${logId}: added but jobManager not enabled, can't start immediately`
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);
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} else {
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log.info(`${logId}: starting job immediately`);
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drop(this.startJob(job));
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}
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} else if (this.enabled) {
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drop(this.maybeStartJobs());
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}
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return { isAlreadyRunning: false };
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} catch (e) {
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log.error(`${logId}: error saving job`, Errors.toLogFormat(e));
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throw e;
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}
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}
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// maybeStartJobs is called:
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// 1. every minute (via tick)
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// 2. after a job is added (via addJob)
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// 3. after a job finishes (via startJob)
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// preventing re-entrancy allow us to simplify some logic and ensure we don't try to
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// start too many jobs
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private _inMaybeStartJobs = false;
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protected async maybeStartJobs(): Promise<void> {
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if (this._inMaybeStartJobs) {
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return;
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}
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try {
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this._inMaybeStartJobs = true;
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if (!this.enabled) {
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log.info(`${this.logPrefix}/_maybeStartJobs: not enabled, returning`);
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return;
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}
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const numJobsToStart = this.getMaximumNumberOfJobsToStart();
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if (numJobsToStart <= 0) {
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return;
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}
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const nextJobs = await this.params.getNextJobs({
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limit: numJobsToStart,
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timestamp: Date.now(),
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});
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if (nextJobs.length === 0 && this.activeJobs.size === 0) {
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if (this.idleCallbacks.length > 0) {
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const callbacks = this.idleCallbacks;
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this.idleCallbacks = [];
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for (const callback of callbacks) {
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callback();
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}
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}
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return;
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}
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if (this.params.shouldHoldOffOnStartingQueuedJobs?.()) {
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log.info(
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`${this.logPrefix}/_maybeStartJobs: holding off on starting ${nextJobs.length} new job(s)`
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);
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return;
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}
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for (const job of nextJobs) {
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drop(this.startJob(job));
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}
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} finally {
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this._inMaybeStartJobs = false;
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}
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}
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protected async startJob(
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job: CoreJobType & JobManagerJobType
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): Promise<void> {
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const logId = `${this.logPrefix}/startJob(${this.params.getJobIdForLogging(
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job
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)})`;
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if (this.isJobRunning(job)) {
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log.info(`${logId}: job is already running`);
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return;
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}
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const isLastAttempt =
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job.attempts + 1 >=
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(this.params.getRetryConfig(job).maxAttempts ?? Infinity);
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let jobRunResult: JobManagerJobResultType<CoreJobType> | undefined;
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try {
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log.info(`${logId}: starting job`);
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this.addRunningJob(job);
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await this.params.saveJob({ ...job, active: true });
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const runJobPromise = this.params.runJob(job, isLastAttempt);
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this.handleJobStartPromises(job);
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jobRunResult = await runJobPromise;
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const { status } = jobRunResult;
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log.info(`${logId}: job completed with status: ${status}`);
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switch (status) {
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case 'finished':
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await this.params.removeJob(job);
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return;
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case 'retry':
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if (isLastAttempt) {
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throw new Error('Cannot retry on last attempt');
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}
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await this.retryJobLater(job);
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return;
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case 'rate-limited':
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log.info(
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`${logId}: rate-limited; retrying in ${jobRunResult.pauseDurationMs}`
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);
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this.pauseForDuration(jobRunResult.pauseDurationMs);
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await this.retryJobLater(job);
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return;
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default:
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throw missingCaseError(status);
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}
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} catch (e) {
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log.error(`${logId}: error when running job`, e);
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if (isLastAttempt) {
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await this.params.removeJob(job);
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} else {
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await this.retryJobLater(job);
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}
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} finally {
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this.removeRunningJob(job);
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if (jobRunResult?.status === 'finished') {
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if (jobRunResult.newJob) {
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log.info(
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`${logId}: adding new job as a result of this one completing`
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);
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await this.addJob(jobRunResult.newJob);
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}
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}
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drop(this.maybeStartJobs());
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}
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}
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private async retryJobLater(job: CoreJobType & JobManagerJobType) {
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const now = Date.now();
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await this.params.saveJob({
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...job,
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active: false,
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attempts: job.attempts + 1,
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retryAfter:
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now +
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exponentialBackoffSleepTime(
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job.attempts + 1,
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this.params.getRetryConfig(job).backoffConfig
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),
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lastAttemptTimestamp: now,
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});
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}
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private getActiveJobCount(): number {
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return this.activeJobs.size;
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}
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private getMaximumNumberOfJobsToStart(): number {
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return Math.max(
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0,
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this.params.maxConcurrentJobs - this.getActiveJobCount()
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);
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}
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private getRunningJob(
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job: CoreJobType & JobManagerJobType
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): (CoreJobType & JobManagerJobType) | undefined {
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const id = this.params.getJobId(job);
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return this.activeJobs.get(id)?.job;
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}
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private isJobRunning(job: CoreJobType & JobManagerJobType): boolean {
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return Boolean(this.getRunningJob(job));
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}
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private removeRunningJob(job: CoreJobType & JobManagerJobType) {
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const idWithAttempts = this.getJobIdIncludingAttempts(job);
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this.jobCompletePromises.get(idWithAttempts)?.resolve();
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this.jobCompletePromises.delete(idWithAttempts);
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const id = this.params.getJobId(job);
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this.activeJobs.get(id)?.completionPromise.resolve();
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this.activeJobs.delete(id);
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}
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private addRunningJob(job: CoreJobType & JobManagerJobType) {
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if (this.isJobRunning(job)) {
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const jobIdForLogging = this.params.getJobIdForLogging(job);
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log.warn(
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`${this.logPrefix}/addRunningJob: job ${jobIdForLogging} is already running`
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);
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}
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this.activeJobs.set(this.params.getJobId(job), {
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completionPromise: explodePromise<void>(),
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job,
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});
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}
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private handleJobStartPromises(job: CoreJobType & JobManagerJobType) {
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const id = this.getJobIdIncludingAttempts(job);
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this.jobStartPromises.get(id)?.resolve();
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this.jobStartPromises.delete(id);
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}
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private getJobIdIncludingAttempts(
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job: CoreJobType & Pick<JobManagerJobType, 'attempts'>
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) {
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return `${this.params.getJobId(job)}.${job.attempts}`;
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}
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}
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