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'use strict'
const { InvalidArgumentError, MaxOriginsReachedError } = require('../core/errors')
const { kClients, kRunning, kClose, kDestroy, kDispatch, kUrl } = require('../core/symbols')
const DispatcherBase = require('./dispatcher-base')
const Pool = require('./pool')
const Client = require('./client')
const util = require('../core/util')
const kOnConnect = Symbol('onConnect')
const kOnDisconnect = Symbol('onDisconnect')
const kOnConnectionError = Symbol('onConnectionError')
const kOnDrain = Symbol('onDrain')
const kFactory = Symbol('factory')
const kOptions = Symbol('options')
const kOrigins = Symbol('origins')
function defaultFactory (origin, opts) {
return opts && opts.connections === 1
? new Client(origin, opts)
: new Pool(origin, opts)
}
class Agent extends DispatcherBase {
constructor ({ factory = defaultFactory, maxOrigins = Infinity, connect, ...options } = {}) {
if (typeof factory !== 'function') {
throw new InvalidArgumentError('factory must be a function.')
}
if (connect != null && typeof connect !== 'function' && typeof connect !== 'object') {
throw new InvalidArgumentError('connect must be a function or an object')
}
if (typeof maxOrigins !== 'number' || Number.isNaN(maxOrigins) || maxOrigins <= 0) {
throw new InvalidArgumentError('maxOrigins must be a number greater than 0')
}
super()
if (connect && typeof connect !== 'function') {
connect = { ...connect }
}
this[kOptions] = { ...util.deepClone(options), maxOrigins, connect }
this[kFactory] = factory
this[kClients] = new Map()
this[kOrigins] = new Set()
this[kOnDrain] = (origin, targets) => {
this.emit('drain', origin, [this, ...targets])
}
this[kOnConnect] = (origin, targets) => {
this.emit('connect', origin, [this, ...targets])
}
this[kOnDisconnect] = (origin, targets, err) => {
this.emit('disconnect', origin, [this, ...targets], err)
}
this[kOnConnectionError] = (origin, targets, err) => {
this.emit('connectionError', origin, [this, ...targets], err)
}
}
get [kRunning] () {
let ret = 0
for (const { dispatcher } of this[kClients].values()) {
ret += dispatcher[kRunning]
}
return ret
}
[kDispatch] (opts, handler) {
let key
if (opts.origin && (typeof opts.origin === 'string' || opts.origin instanceof URL)) {
key = String(opts.origin)
} else {
throw new InvalidArgumentError('opts.origin must be a non-empty string or URL.')
}
if (this[kOrigins].size >= this[kOptions].maxOrigins && !this[kOrigins].has(key)) {
throw new MaxOriginsReachedError()
}
const result = this[kClients].get(key)
let dispatcher = result && result.dispatcher
if (!dispatcher) {
const closeClientIfUnused = (connected) => {
const result = this[kClients].get(key)
if (result) {
if (connected) result.count -= 1
if (result.count <= 0) {
this[kClients].delete(key)
if (!result.dispatcher.destroyed) {
result.dispatcher.close()
}
}
this[kOrigins].delete(key)
}
}
dispatcher = this[kFactory](opts.origin, this[kOptions])
.on('drain', this[kOnDrain])
.on('connect', (origin, targets) => {
const result = this[kClients].get(key)
if (result) {
result.count += 1
}
this[kOnConnect](origin, targets)
})
.on('disconnect', (origin, targets, err) => {
closeClientIfUnused(true)
this[kOnDisconnect](origin, targets, err)
})
.on('connectionError', (origin, targets, err) => {
closeClientIfUnused(false)
this[kOnConnectionError](origin, targets, err)
})
this[kClients].set(key, { count: 0, dispatcher })
this[kOrigins].add(key)
}
return dispatcher.dispatch(opts, handler)
}
[kClose] () {
const closePromises = []
for (const { dispatcher } of this[kClients].values()) {
closePromises.push(dispatcher.close())
}
this[kClients].clear()
return Promise.all(closePromises)
}
[kDestroy] (err) {
const destroyPromises = []
for (const { dispatcher } of this[kClients].values()) {
destroyPromises.push(dispatcher.destroy(err))
}
this[kClients].clear()
return Promise.all(destroyPromises)
}
get stats () {
const allClientStats = {}
for (const { dispatcher } of this[kClients].values()) {
if (dispatcher.stats) {
allClientStats[dispatcher[kUrl].origin] = dispatcher.stats
}
}
return allClientStats
}
}
module.exports = Agent
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