/
worker.ts
136 lines (114 loc) · 4.9 KB
/
worker.ts
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
import type { CloneOption, DefineWorkerOptions, InlineWorkerContext, Procedure } from './types'
import { InlineWorkerRunner } from './runner'
import { createMessageEvent, debug, getRunnerOptions } from './utils'
export function createWorkerConstructor(options?: DefineWorkerOptions): typeof Worker {
const runnerOptions = getRunnerOptions()
const cloneType = () => (options?.clone ?? process.env.VITEST_WEB_WORKER_CLONE ?? 'native') as CloneOption
return class Worker extends EventTarget {
static __VITEST_WEB_WORKER__ = true
private _vw_workerTarget = new EventTarget()
private _vw_insideListeners = new Map<string, EventListenerOrEventListenerObject>()
private _vw_outsideListeners = new Map<string, EventListenerOrEventListenerObject>()
private _vw_name: string
private _vw_messageQueue: any[] | null = []
public onmessage: null | Procedure = null
public onmessageerror: null | Procedure = null
public onerror: null | Procedure = null
constructor(url: URL | string, options?: WorkerOptions) {
super()
// should be equal to DedicatedWorkerGlobalScope
const context: InlineWorkerContext = {
onmessage: null,
name: options?.name,
close: () => this.terminate(),
dispatchEvent: (event: Event) => {
return this._vw_workerTarget.dispatchEvent(event)
},
addEventListener: (...args) => {
if (args[1])
this._vw_insideListeners.set(args[0], args[1])
return this._vw_workerTarget.addEventListener(...args)
},
removeEventListener: this._vw_workerTarget.removeEventListener,
postMessage: (...args) => {
if (!args.length)
throw new SyntaxError('"postMessage" requires at least one argument.')
debug('posting message %o from the worker %s to the main thread', args[0], this._vw_name)
const event = createMessageEvent(args[0], args[1], cloneType())
this.dispatchEvent(event)
},
get self() {
return context
},
get global() {
return context
},
}
this._vw_workerTarget.addEventListener('message', (e) => {
context.onmessage?.(e)
})
this.addEventListener('message', (e) => {
this.onmessage?.(e)
})
this.addEventListener('messageerror', (e) => {
this.onmessageerror?.(e)
})
const runner = new InlineWorkerRunner(runnerOptions, context)
const id = (url instanceof URL ? url.toString() : url).replace(/^file:\/+/, '/')
this._vw_name = id
runner.resolveUrl(id).then(([, fsPath]) => {
this._vw_name = options?.name ?? fsPath
debug('initialize worker %s', this._vw_name)
runner.executeFile(fsPath).then(() => {
// worker should be new every time, invalidate its sub dependency
runnerOptions.moduleCache.invalidateSubDepTree([fsPath, `mock:${fsPath}`])
const q = this._vw_messageQueue
this._vw_messageQueue = null
if (q)
q.forEach(([data, transfer]) => this.postMessage(data, transfer), this)
debug('worker %s successfully initialized', this._vw_name)
}).catch((e) => {
debug('worker %s failed to initialize: %o', this._vw_name, e)
const EventConstructor = globalThis.ErrorEvent || globalThis.Event
const error = new EventConstructor('error', {
error: e,
message: e.message,
})
this.dispatchEvent(error)
this.onerror?.(error)
console.error(e)
})
})
}
addEventListener(type: string, callback: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void {
if (callback)
this._vw_outsideListeners.set(type, callback)
return super.addEventListener(type, callback, options)
}
postMessage(...args: [any, StructuredSerializeOptions | Transferable[] | undefined]): void {
if (!args.length)
throw new SyntaxError('"postMessage" requires at least one argument.')
const [data, transferOrOptions] = args
if (this._vw_messageQueue != null) {
debug('worker %s is not yet initialized, queue message %s', this._vw_name, data)
this._vw_messageQueue.push([data, transferOrOptions])
return
}
debug('posting message %o from the main thread to the worker %s', data, this._vw_name)
const event = createMessageEvent(data, transferOrOptions, cloneType())
if (event.type === 'messageerror')
this.dispatchEvent(event)
else
this._vw_workerTarget.dispatchEvent(event)
}
terminate() {
debug('terminating worker %s', this._vw_name)
this._vw_outsideListeners.forEach((fn, type) => {
this.removeEventListener(type, fn)
})
this._vw_insideListeners.forEach((fn, type) => {
this._vw_workerTarget.removeEventListener(type, fn)
})
}
}
}