143 lines
3.7 KiB
TypeScript
143 lines
3.7 KiB
TypeScript
import { AsyncQueue, forever, queue } from 'async'
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import * as Sequelize from 'sequelize'
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import { database as db } from '../../initializers/database'
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import {
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JOBS_FETCHING_INTERVAL,
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JOBS_FETCH_LIMIT_PER_CYCLE,
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JOB_STATES
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} from '../../initializers'
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import { logger } from '../../helpers'
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import { JobInstance } from '../../models'
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import { JobHandler, jobHandlers } from './handlers'
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type JobQueueCallback = (err: Error) => void
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class JobScheduler {
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private static instance: JobScheduler
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private constructor () { }
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static get Instance () {
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return this.instance || (this.instance = new this())
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}
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async activate () {
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const limit = JOBS_FETCH_LIMIT_PER_CYCLE
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logger.info('Jobs scheduler activated.')
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const jobsQueue = queue<JobInstance, JobQueueCallback>(this.processJob.bind(this))
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// Finish processing jobs from a previous start
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const state = JOB_STATES.PROCESSING
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try {
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const jobs = await db.Job.listWithLimit(limit, state)
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this.enqueueJobs(jobsQueue, jobs)
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} catch (err) {
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logger.error('Cannot list pending jobs.', err)
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}
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forever(
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async next => {
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if (jobsQueue.length() !== 0) {
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// Finish processing the queue first
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return setTimeout(next, JOBS_FETCHING_INTERVAL)
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}
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const state = JOB_STATES.PENDING
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try {
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const jobs = await db.Job.listWithLimit(limit, state)
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this.enqueueJobs(jobsQueue, jobs)
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} catch (err) {
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logger.error('Cannot list pending jobs.', err)
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}
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// Optimization: we could use "drain" from queue object
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return setTimeout(next, JOBS_FETCHING_INTERVAL)
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},
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err => logger.error('Error in job scheduler queue.', err)
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)
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}
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createJob (transaction: Sequelize.Transaction, handlerName: string, handlerInputData: object) {
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const createQuery = {
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state: JOB_STATES.PENDING,
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handlerName,
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handlerInputData
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}
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const options = { transaction }
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return db.Job.create(createQuery, options)
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}
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private enqueueJobs (jobsQueue: AsyncQueue<JobInstance>, jobs: JobInstance[]) {
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jobs.forEach(job => jobsQueue.push(job))
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}
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private async processJob (job: JobInstance, callback: (err: Error) => void) {
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const jobHandler = jobHandlers[job.handlerName]
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if (jobHandler === undefined) {
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logger.error('Unknown job handler for job %s.', job.handlerName)
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return callback(null)
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}
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logger.info('Processing job %d with handler %s.', job.id, job.handlerName)
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job.state = JOB_STATES.PROCESSING
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await job.save()
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try {
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const result = await jobHandler.process(job.handlerInputData, job.id)
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await this.onJobSuccess(jobHandler, job, result)
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} catch (err) {
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logger.error('Error in job handler %s.', job.handlerName, err)
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try {
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await this.onJobError(jobHandler, job, err)
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} catch (innerErr) {
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this.cannotSaveJobError(innerErr)
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return callback(innerErr)
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}
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}
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callback(null)
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}
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private async onJobError (jobHandler: JobHandler<any>, job: JobInstance, err: Error) {
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job.state = JOB_STATES.ERROR
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try {
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await job.save()
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await jobHandler.onError(err, job.id)
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} catch (err) {
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this.cannotSaveJobError(err)
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}
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}
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private async onJobSuccess (jobHandler: JobHandler<any>, job: JobInstance, jobResult: any) {
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job.state = JOB_STATES.SUCCESS
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try {
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await job.save()
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jobHandler.onSuccess(job.id, jobResult)
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} catch (err) {
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this.cannotSaveJobError(err)
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}
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}
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private cannotSaveJobError (err: Error) {
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logger.error('Cannot save new job state.', err)
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}
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}
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// ---------------------------------------------------------------------------
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export {
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JobScheduler
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}
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