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boss.js
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boss.js
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const EventEmitter = require('events')
const plans = require('./plans')
const { states } = require('./plans')
const queues = {
MAINTENANCE: '__pgboss__maintenance',
MONITOR_STATES: '__pgboss__monitor-states'
}
const events = {
error: 'error',
monitorStates: 'monitor-states',
maintenance: 'maintenance'
}
class Boss extends EventEmitter {
constructor (db, config) {
super()
this.db = db
this.config = config
this.manager = config.manager
this.maintenanceIntervalSeconds = config.maintenanceIntervalSeconds
this.monitorStates = config.monitorStateIntervalSeconds !== null
if (this.monitorStates) {
this.monitorIntervalSeconds = config.monitorStateIntervalSeconds
}
this.events = events
this.expireCommand = plans.expire(config.schema)
this.archiveCommand = plans.archive(config.schema, config.archiveInterval)
this.purgeCommand = plans.purge(config.schema, config.deleteAfter)
this.getMaintenanceTimeCommand = plans.getMaintenanceTime(config.schema)
this.setMaintenanceTimeCommand = plans.setMaintenanceTime(config.schema)
this.countStatesCommand = plans.countStates(config.schema)
this.functions = [
this.expire,
this.archive,
this.purge,
this.countStates,
this.getQueueNames
]
}
async supervise () {
this.metaMonitor()
await this.manager.deleteQueue(plans.completedJobPrefix + queues.MAINTENANCE)
await this.manager.deleteQueue(queues.MAINTENANCE)
await this.maintenanceAsync()
const maintenanceSubscribeOptions = {
newJobCheckIntervalSeconds: Math.max(1, this.maintenanceIntervalSeconds / 2)
}
await this.manager.subscribe(queues.MAINTENANCE, maintenanceSubscribeOptions, (job) => this.onMaintenance(job))
if (this.monitorStates) {
await this.manager.deleteQueue(plans.completedJobPrefix + queues.MONITOR_STATES)
await this.manager.deleteQueue(queues.MONITOR_STATES)
await this.monitorStatesAsync()
const monitorStatesSubscribeOptions = {
newJobCheckIntervalSeconds: Math.max(1, this.monitorIntervalSeconds / 2)
}
await this.manager.subscribe(queues.MONITOR_STATES, monitorStatesSubscribeOptions, (job) => this.onMonitorStates(job))
}
}
metaMonitor () {
this.metaMonitorInterval = setInterval(async () => {
const { secondsAgo } = await this.getMaintenanceTime()
if (secondsAgo > this.maintenanceIntervalSeconds * 2) {
await this.manager.deleteQueue(queues.MAINTENANCE, { before: states.completed })
await this.maintenanceAsync()
}
}, this.maintenanceIntervalSeconds * 2 * 1000)
}
async maintenanceAsync (options = {}) {
const { startAfter } = options
options = {
startAfter,
retentionSeconds: this.maintenanceIntervalSeconds * 4,
singletonKey: queues.MAINTENANCE,
onComplete: false
}
await this.manager.publish(queues.MAINTENANCE, null, options)
}
async monitorStatesAsync (options = {}) {
const { startAfter } = options
options = {
startAfter,
retentionSeconds: this.monitorIntervalSeconds * 4,
singletonKey: queues.MONITOR_STATES,
onComplete: false
}
await this.manager.publish(queues.MONITOR_STATES, null, options)
}
async onMaintenance (job) {
try {
if (this.config.__test__throw_maint) {
throw new Error('__test__throw_maint')
}
const started = Date.now()
await this.expire()
await this.archive()
await this.purge()
const ended = Date.now()
await this.setMaintenanceTime()
this.emit('maintenance', { ms: ended - started })
if (!this.stopped) {
await job.done() // pre-complete to bypass throttling
await this.maintenanceAsync({ startAfter: this.maintenanceIntervalSeconds })
}
} catch (err) {
this.emit(events.error, err)
throw err
}
}
async onMonitorStates (job) {
try {
if (this.config.__test__throw_monitor) {
throw new Error('__test__throw_monitor')
}
const states = await this.countStates()
this.emit(events.monitorStates, states)
if (!this.stopped && this.monitorStates) {
await job.done() // pre-complete to bypass throttling
await this.monitorStatesAsync({ startAfter: this.monitorIntervalSeconds })
}
} catch (err) {
this.emit(events.error, err)
}
}
async stop () {
if (!this.stopped) {
if (this.metaMonitorInterval) {
clearInterval(this.metaMonitorInterval)
}
this.stopped = true
}
}
async countStates () {
const stateCountDefault = { ...plans.states }
Object.keys(stateCountDefault)
.forEach(key => { stateCountDefault[key] = 0 })
const counts = await this.db.executeSql(this.countStatesCommand)
const states = counts.rows.reduce((acc, item) => {
if (item.name) {
acc.queues[item.name] = acc.queues[item.name] || { ...stateCountDefault }
}
const queue = item.name ? acc.queues[item.name] : acc
const state = item.state || 'all'
// parsing int64 since pg returns it as string
queue[state] = parseFloat(item.size)
return acc
}, { ...stateCountDefault, queues: {} })
return states
}
async expire () {
await this.db.executeSql(plans.locked(this.expireCommand))
}
async archive () {
await this.db.executeSql(plans.locked(this.archiveCommand))
}
async purge () {
await this.db.executeSql(plans.locked(this.purgeCommand))
}
async setMaintenanceTime () {
await this.db.executeSql(this.setMaintenanceTimeCommand)
}
async getMaintenanceTime () {
const { rows } = await this.db.executeSql(this.getMaintenanceTimeCommand)
let { maintained_on: maintainedOn, seconds_ago: secondsAgo } = rows[0]
secondsAgo = secondsAgo !== null ? parseFloat(secondsAgo) : this.maintenanceIntervalSeconds * 10
return { maintainedOn, secondsAgo }
}
getQueueNames () {
return queues
}
}
module.exports = Boss