1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
'use strict'
const { InvalidArgumentError } = require('./core/errors')
const { kClients, kRunning, kClose, kDestroy, kDispatch, kInterceptors } = require('./core/symbols')
const DispatcherBase = require('./dispatcher-base')
const Pool = require('./pool')
const Client = require('./client')
const util = require('./core/util')
const createRedirectInterceptor = require('./interceptor/redirectInterceptor')
const { WeakRef, FinalizationRegistry } = require('./compat/dispatcher-weakref')()
const kOnConnect = Symbol('onConnect')
const kOnDisconnect = Symbol('onDisconnect')
const kOnConnectionError = Symbol('onConnectionError')
const kMaxRedirections = Symbol('maxRedirections')
const kOnDrain = Symbol('onDrain')
const kFactory = Symbol('factory')
const kFinalizer = Symbol('finalizer')
const kOptions = Symbol('options')
function defaultFactory (origin, opts) {
return opts && opts.connections === 1
? new Client(origin, opts)
: new Pool(origin, opts)
}
class Agent extends DispatcherBase {
constructor ({ factory = defaultFactory, maxRedirections = 0, connect, ...options } = {}) {
super()
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 (!Number.isInteger(maxRedirections) || maxRedirections < 0) {
throw new InvalidArgumentError('maxRedirections must be a positive number')
}
if (connect && typeof connect !== 'function') {
connect = { ...connect }
}
this[kInterceptors] = options.interceptors && options.interceptors.Agent && Array.isArray(options.interceptors.Agent)
? options.interceptors.Agent
: [createRedirectInterceptor({ maxRedirections })]
this[kOptions] = { ...util.deepClone(options), connect }
this[kOptions].interceptors = options.interceptors
? { ...options.interceptors }
: undefined
this[kMaxRedirections] = maxRedirections
this[kFactory] = factory
this[kClients] = new Map()
this[kFinalizer] = new FinalizationRegistry(/* istanbul ignore next: gc is undeterministic */ key => {
const ref = this[kClients].get(key)
if (ref !== undefined && ref.deref() === undefined) {
this[kClients].delete(key)
}
})
const agent = this
this[kOnDrain] = (origin, targets) => {
agent.emit('drain', origin, [agent, ...targets])
}
this[kOnConnect] = (origin, targets) => {
agent.emit('connect', origin, [agent, ...targets])
}
this[kOnDisconnect] = (origin, targets, err) => {
agent.emit('disconnect', origin, [agent, ...targets], err)
}
this[kOnConnectionError] = (origin, targets, err) => {
agent.emit('connectionError', origin, [agent, ...targets], err)
}
}
get [kRunning] () {
let ret = 0
for (const ref of this[kClients].values()) {
const client = ref.deref()
/* istanbul ignore next: gc is undeterministic */
if (client) {
ret += client[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.')
}
const ref = this[kClients].get(key)
let dispatcher = ref ? ref.deref() : null
if (!dispatcher) {
dispatcher = this[kFactory](opts.origin, this[kOptions])
.on('drain', this[kOnDrain])
.on('connect', this[kOnConnect])
.on('disconnect', this[kOnDisconnect])
.on('connectionError', this[kOnConnectionError])
this[kClients].set(key, new WeakRef(dispatcher))
this[kFinalizer].register(dispatcher, key)
}
return dispatcher.dispatch(opts, handler)
}
async [kClose] () {
const closePromises = []
for (const ref of this[kClients].values()) {
const client = ref.deref()
/* istanbul ignore else: gc is undeterministic */
if (client) {
closePromises.push(client.close())
}
}
await Promise.all(closePromises)
}
async [kDestroy] (err) {
const destroyPromises = []
for (const ref of this[kClients].values()) {
const client = ref.deref()
/* istanbul ignore else: gc is undeterministic */
if (client) {
destroyPromises.push(client.destroy(err))
}
}
await Promise.all(destroyPromises)
}
}
module.exports = Agent
|
