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const intersection = require('lodash/intersection')
const config = require('./config')
const {getLogger} = require('./logger')
const {RequestMessage, PingMessage} = require('./server')
const throttle = require('lodash/throttle')
class WorkersList {
constructor() {
/**
* @type {{connection: Connection, targets: string[]}[]}
*/
this.workers = []
/**
* @type {object.<string, boolean>}
*/
this.targetsToPoke = {}
/**
* @type {object.<string, boolean>}
*/
this.targetsWaitingToPoke = {}
/**
* @type {NodeJS.Timeout}
*/
this.pingInterval = setInterval(this.sendPings, config.get('ping_interval') * 1000)
/**
* @type {Logger}
*/
this.logger = getLogger('WorkersList')
}
/**
* @param {Connection} connection
* @param {string[]} targets
*/
add(connection, targets) {
this.logger.info(`add: connection from ${connection.remoteAddr()}, targets ${JSON.stringify(targets)}`)
this.workers.push({connection, targets})
connection.on('close', () => {
this.logger.info(`connection from ${connection.remoteAddr()} closed, removing worker`)
this.workers = this.workers.filter(worker => {
return worker.connection !== connection
})
})
let waiting = Object.keys(this.targetsWaitingToPoke)
if (!waiting.length)
return
let intrs = intersection(waiting, targets)
if (intrs.length) {
this.logger.info('add: found intersection with waiting targets:', intrs, 'going to poke new worker')
this._pokeWorkerConnection(connection, intrs)
for (let target of intrs)
delete this.targetsWaitingToPoke[target]
this.logger.trace(`add: this.targetsWaitingToPoke:`, this.targetsWaitingToPoke)
}
}
/**
* @param {string[]} targets
*/
poke(targets) {
this.logger.debug('poke:', targets)
if (!Array.isArray(targets))
throw new Error('targets must be Array')
for (let t of targets)
this.targetsToPoke[t] = true
this._pokeWorkers()
}
/**
* @private
*/
_pokeWorkers = throttle(() => {
const targets = Object.keys(this.targetsToPoke)
this.targetsToPoke = {}
const found = {}
for (const worker of this.workers) {
const intrs = intersection(worker.targets, targets)
intrs.forEach(t => {
found[t] = true
})
if (intrs.length > 0)
this._pokeWorkerConnection(worker.connection, targets)
}
for (let target of targets) {
if (!(target in found)) {
this.logger.debug(`_pokeWorkers: worker responsible for ${target} not found. we'll remember it`)
this.targetsWaitingToPoke[target] = true
}
this.logger.trace('_pokeWorkers: this.targetsWaitingToPoke:', this.targetsWaitingToPoke)
}
}, config.get('poke_throttle_interval') * 1000, {leading: true})
/**
* @param {Connection} connection
* @param {string[]} targets
* @private
*/
_pokeWorkerConnection(connection, targets) {
this.logger.debug('_pokeWorkerConnection:', connection.remoteAddr(), targets)
connection.sendRequest(
new RequestMessage('poll', {
targets
})
)
.then(error => {
this.logger.error('_pokeWorkerConnection:', error)
})
}
/**
* @return {{targets: string[], remoteAddr: string, remotePort: number}[]}
*/
async getInfo(pollWorkers = false) {
const promises = []
const workers = [...this.workers]
for (let i = 0; i < workers.length; i++) {
let worker = workers[i]
let P
if (pollWorkers) {
P = worker.connection.sendRequest(new RequestMessage('status'))
} else {
P = Promise.resolve()
}
promises.push(P)
}
const results = await Promise.allSettled(promises)
let info = []
for (let i = 0; i < results.length; i++) {
const result = results[i]
const worker = workers[i]
const workerInfo = {
remoteAddr: worker.connection.socket?.remoteAddress,
remotePort: worker.connection.socket?.remotePort,
targets: worker.targets
}
if (pollWorkers) {
if (result.status === 'fulfilled') {
/**
* @type {ResponseMessage}
*/
let response = result.value
workerInfo.workerStatus = response.data
} else if (result.status === 'rejected') {
workerInfo.workerStatusError = result.reason?.message
}
}
info.push(workerInfo)
}
return info
}
/**
* @private
*/
sendPings = () => {
this.workers
.forEach(w => {
this.logger.trace(`sending ping to ${w.connection.remoteAddr()}`)
w.connection.send(new PingMessage())
})
}
}
module.exports = WorkersList
|
