PeerTube/server/lib/jobs/job-scheduler.ts

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