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-rw-r--r--server/lib/jobs/job-scheduler.ts137
1 files changed, 137 insertions, 0 deletions
diff --git a/server/lib/jobs/job-scheduler.ts b/server/lib/jobs/job-scheduler.ts
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index 000000000..7b8c6faf9
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+++ b/server/lib/jobs/job-scheduler.ts
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1import { forever, queue } from 'async'
2
3const db = require('../../initializers/database')
4import {
5 JOBS_FETCHING_INTERVAL,
6 JOBS_FETCH_LIMIT_PER_CYCLE,
7 JOB_STATES
8} from '../../initializers'
9import { logger } from '../../helpers'
10import { jobHandlers } from './handlers'
11
12class JobScheduler {
13
14 private static instance: JobScheduler
15
16 private constructor () { }
17
18 static get Instance () {
19 return this.instance || (this.instance = new this())
20 }
21
22 activate () {
23 const limit = JOBS_FETCH_LIMIT_PER_CYCLE
24
25 logger.info('Jobs scheduler activated.')
26
27 const jobsQueue = queue(this.processJob)
28
29 // Finish processing jobs from a previous start
30 const state = JOB_STATES.PROCESSING
31 db.Job.listWithLimit(limit, state, (err, jobs) => {
32 this.enqueueJobs(err, jobsQueue, jobs)
33
34 forever(
35 next => {
36 if (jobsQueue.length() !== 0) {
37 // Finish processing the queue first
38 return setTimeout(next, JOBS_FETCHING_INTERVAL)
39 }
40
41 const state = JOB_STATES.PENDING
42 db.Job.listWithLimit(limit, state, (err, jobs) => {
43 if (err) {
44 logger.error('Cannot list pending jobs.', { error: err })
45 } else {
46 jobs.forEach(job => {
47 jobsQueue.push(job)
48 })
49 }
50
51 // Optimization: we could use "drain" from queue object
52 return setTimeout(next, JOBS_FETCHING_INTERVAL)
53 })
54 },
55
56 err => { logger.error('Error in job scheduler queue.', { error: err }) }
57 )
58 })
59 }
60
61 createJob (transaction, handlerName, handlerInputData, callback) {
62 const createQuery = {
63 state: JOB_STATES.PENDING,
64 handlerName,
65 handlerInputData
66 }
67 const options = { transaction }
68
69 db.Job.create(createQuery, options).asCallback(callback)
70 }
71
72 private enqueueJobs (err, jobsQueue, jobs) {
73 if (err) {
74 logger.error('Cannot list pending jobs.', { error: err })
75 } else {
76 jobs.forEach(job => {
77 jobsQueue.push(job)
78 })
79 }
80 }
81
82 private processJob (job, callback) {
83 const jobHandler = jobHandlers[job.handlerName]
84
85 logger.info('Processing job %d with handler %s.', job.id, job.handlerName)
86
87 job.state = JOB_STATES.PROCESSING
88 job.save().asCallback(err => {
89 if (err) return this.cannotSaveJobError(err, callback)
90
91 if (jobHandler === undefined) {
92 logger.error('Unknown job handler for job %s.', jobHandler.handlerName)
93 return callback()
94 }
95
96 return jobHandler.process(job.handlerInputData, (err, result) => {
97 if (err) {
98 logger.error('Error in job handler %s.', job.handlerName, { error: err })
99 return this.onJobError(jobHandler, job, result, callback)
100 }
101
102 return this.onJobSuccess(jobHandler, job, result, callback)
103 })
104 })
105 }
106
107 private onJobError (jobHandler, job, jobResult, callback) {
108 job.state = JOB_STATES.ERROR
109
110 job.save().asCallback(err => {
111 if (err) return this.cannotSaveJobError(err, callback)
112
113 return jobHandler.onError(err, job.id, jobResult, callback)
114 })
115 }
116
117 private onJobSuccess (jobHandler, job, jobResult, callback) {
118 job.state = JOB_STATES.SUCCESS
119
120 job.save().asCallback(err => {
121 if (err) return this.cannotSaveJobError(err, callback)
122
123 return jobHandler.onSuccess(err, job.id, jobResult, callback)
124 })
125 }
126
127 private cannotSaveJobError (err, callback) {
128 logger.error('Cannot save new job state.', { error: err })
129 return callback(err)
130 }
131}
132
133// ---------------------------------------------------------------------------
134
135export {
136 JobScheduler
137}