Merge dependabot/npm_and_yarn/examples/typescript/websocket-server-pool/ws-hybrid...
[poolifier.git] / src / worker / abstract-worker.ts
CommitLineData
fc3e6586 1import { AsyncResource } from 'node:async_hooks'
6677a3d3 2import type { Worker } from 'node:cluster'
fc3e6586 3import type { MessagePort } from 'node:worker_threads'
d715b7bc
JB
4import { performance } from 'node:perf_hooks'
5import type {
6 MessageValue,
5c4d16da 7 Task,
d715b7bc
JB
8 TaskPerformance,
9 WorkerStatistics
10} from '../utility-types'
ff128cc9
JB
11import {
12 DEFAULT_TASK_NAME,
13 EMPTY_FUNCTION,
14 isAsyncFunction,
15 isPlainObject
16} from '../utils'
d38d0e30 17import { KillBehaviors, type WorkerOptions } from './worker-options'
b6b32453 18import type {
82ea6492
JB
19 TaskAsyncFunction,
20 TaskFunction,
4e38fd21 21 TaskFunctionOperationResult,
b6b32453 22 TaskFunctions,
82ea6492
JB
23 TaskSyncFunction
24} from './task-functions'
9a38f99e
JB
25import {
26 checkTaskFunctionName,
27 checkValidTaskFunctionEntry,
28 checkValidWorkerOptions
29} from './utils'
4c35177b 30
978aad6f 31const DEFAULT_MAX_INACTIVE_TIME = 60000
d38d0e30
JB
32const DEFAULT_WORKER_OPTIONS: WorkerOptions = {
33 /**
34 * The kill behavior option on this worker or its default value.
35 */
36 killBehavior: KillBehaviors.SOFT,
37 /**
38 * The maximum time to keep this worker active while idle.
39 * The pool automatically checks and terminates this worker when the time expires.
40 */
41 maxInactiveTime: DEFAULT_MAX_INACTIVE_TIME,
42 /**
43 * The function to call when the worker is killed.
44 */
45 killHandler: EMPTY_FUNCTION
46}
c97c7edb 47
729c563d 48/**
ea7a90d3 49 * Base class that implements some shared logic for all poolifier workers.
729c563d 50 *
38e795c1 51 * @typeParam MainWorker - Type of main worker.
e102732c
JB
52 * @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data.
53 * @typeParam Response - Type of response the worker sends back to the main worker. This can only be structured-cloneable data.
729c563d 54 */
c97c7edb 55export abstract class AbstractWorker<
6677a3d3 56 MainWorker extends Worker | MessagePort,
d3c8a1a8
S
57 Data = unknown,
58 Response = unknown
c97c7edb 59> extends AsyncResource {
f59e1027 60 /**
83fa0a36 61 * Worker id.
f59e1027
JB
62 */
63 protected abstract id: number
a86b6df1
JB
64 /**
65 * Task function(s) processed by the worker when the pool's `execution` function is invoked.
66 */
82ea6492 67 protected taskFunctions!: Map<string, TaskFunction<Data, Response>>
729c563d
S
68 /**
69 * Timestamp of the last task processed by this worker.
70 */
a9d9ea34 71 protected lastTaskTimestamp!: number
b6b32453 72 /**
8a970421 73 * Performance statistics computation requirements.
b6b32453
JB
74 */
75 protected statistics!: WorkerStatistics
729c563d 76 /**
b0a4db63 77 * Handler id of the `activeInterval` worker activity check.
729c563d 78 */
b0a4db63 79 protected activeInterval?: NodeJS.Timeout
c97c7edb 80 /**
729c563d 81 * Constructs a new poolifier worker.
c97c7edb 82 *
38e795c1
JB
83 * @param type - The type of async event.
84 * @param isMain - Whether this is the main worker or not.
38e795c1 85 * @param mainWorker - Reference to main worker.
85aeb3f3 86 * @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked. The first function is the default function.
38e795c1 87 * @param opts - Options for the worker.
c97c7edb
S
88 */
89 public constructor (
90 type: string,
c2ade475 91 protected readonly isMain: boolean,
6c0c538c 92 private readonly mainWorker: MainWorker,
82ea6492 93 taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>,
d38d0e30 94 protected opts: WorkerOptions = DEFAULT_WORKER_OPTIONS
c97c7edb
S
95 ) {
96 super(type)
9d2d0da1
JB
97 if (this.isMain == null) {
98 throw new Error('isMain parameter is mandatory')
99 }
a86b6df1 100 this.checkTaskFunctions(taskFunctions)
9d2d0da1 101 this.checkWorkerOptions(this.opts)
1f68cede 102 if (!this.isMain) {
0cb6edc2 103 // Should be once() but Node.js on windows has a bug that prevents it from working
e2898b4f 104 this.getMainWorker().on('message', this.handleReadyMessage.bind(this))
c97c7edb
S
105 }
106 }
107
41aa7dcd 108 private checkWorkerOptions (opts: WorkerOptions): void {
9a38f99e 109 checkValidWorkerOptions(opts)
d38d0e30 110 this.opts = { ...DEFAULT_WORKER_OPTIONS, ...opts }
41aa7dcd
JB
111 }
112
113 /**
c20084b6 114 * Checks if the `taskFunctions` parameter is passed to the constructor and valid.
41aa7dcd 115 *
82888165 116 * @param taskFunctions - The task function(s) parameter that should be checked.
41aa7dcd 117 */
a86b6df1 118 private checkTaskFunctions (
82ea6492 119 taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>
a86b6df1 120 ): void {
ec8fd331
JB
121 if (taskFunctions == null) {
122 throw new Error('taskFunctions parameter is mandatory')
123 }
82ea6492 124 this.taskFunctions = new Map<string, TaskFunction<Data, Response>>()
0d80593b 125 if (typeof taskFunctions === 'function') {
2a69b8c5
JB
126 const boundFn = taskFunctions.bind(this)
127 this.taskFunctions.set(DEFAULT_TASK_NAME, boundFn)
128 this.taskFunctions.set(
129 typeof taskFunctions.name === 'string' &&
8ebe6c30 130 taskFunctions.name.trim().length > 0
2a69b8c5
JB
131 ? taskFunctions.name
132 : 'fn1',
133 boundFn
134 )
0d80593b 135 } else if (isPlainObject(taskFunctions)) {
82888165 136 let firstEntry = true
a86b6df1 137 for (const [name, fn] of Object.entries(taskFunctions)) {
9a38f99e 138 checkValidTaskFunctionEntry<Data, Response>(name, fn)
2a69b8c5 139 const boundFn = fn.bind(this)
82888165 140 if (firstEntry) {
2a69b8c5 141 this.taskFunctions.set(DEFAULT_TASK_NAME, boundFn)
82888165
JB
142 firstEntry = false
143 }
c50b93fb 144 this.taskFunctions.set(name, boundFn)
a86b6df1 145 }
630f0acf
JB
146 if (firstEntry) {
147 throw new Error('taskFunctions parameter object is empty')
148 }
a86b6df1 149 } else {
f34fdabe
JB
150 throw new TypeError(
151 'taskFunctions parameter is not a function or a plain object'
152 )
41aa7dcd
JB
153 }
154 }
155
968a2e8c
JB
156 /**
157 * Checks if the worker has a task function with the given name.
158 *
159 * @param name - The name of the task function to check.
160 * @returns Whether the worker has a task function with the given name or not.
968a2e8c 161 */
4e38fd21 162 public hasTaskFunction (name: string): TaskFunctionOperationResult {
6703b9f4 163 try {
9a38f99e 164 checkTaskFunctionName(name)
6703b9f4
JB
165 } catch (error) {
166 return { status: false, error: error as Error }
167 }
168 return { status: this.taskFunctions.has(name) }
968a2e8c
JB
169 }
170
171 /**
172 * Adds a task function to the worker.
173 * If a task function with the same name already exists, it is replaced.
174 *
175 * @param name - The name of the task function to add.
176 * @param fn - The task function to add.
177 * @returns Whether the task function was added or not.
968a2e8c
JB
178 */
179 public addTaskFunction (
180 name: string,
82ea6492 181 fn: TaskFunction<Data, Response>
4e38fd21 182 ): TaskFunctionOperationResult {
968a2e8c 183 try {
9a38f99e 184 checkTaskFunctionName(name)
6703b9f4
JB
185 if (name === DEFAULT_TASK_NAME) {
186 throw new Error(
187 'Cannot add a task function with the default reserved name'
188 )
189 }
190 if (typeof fn !== 'function') {
191 throw new TypeError('fn parameter is not a function')
192 }
646d040a 193 const boundFn = fn.bind(this)
968a2e8c
JB
194 if (
195 this.taskFunctions.get(name) ===
196 this.taskFunctions.get(DEFAULT_TASK_NAME)
197 ) {
2a69b8c5 198 this.taskFunctions.set(DEFAULT_TASK_NAME, boundFn)
968a2e8c 199 }
2a69b8c5 200 this.taskFunctions.set(name, boundFn)
e81c38f2 201 this.sendTaskFunctionNamesToMainWorker()
6703b9f4
JB
202 return { status: true }
203 } catch (error) {
204 return { status: false, error: error as Error }
968a2e8c
JB
205 }
206 }
207
208 /**
209 * Removes a task function from the worker.
210 *
211 * @param name - The name of the task function to remove.
212 * @returns Whether the task function existed and was removed or not.
968a2e8c 213 */
4e38fd21 214 public removeTaskFunction (name: string): TaskFunctionOperationResult {
6703b9f4 215 try {
9a38f99e 216 checkTaskFunctionName(name)
6703b9f4
JB
217 if (name === DEFAULT_TASK_NAME) {
218 throw new Error(
219 'Cannot remove the task function with the default reserved name'
220 )
221 }
222 if (
223 this.taskFunctions.get(name) ===
224 this.taskFunctions.get(DEFAULT_TASK_NAME)
225 ) {
226 throw new Error(
227 'Cannot remove the task function used as the default task function'
228 )
229 }
230 const deleteStatus = this.taskFunctions.delete(name)
e81c38f2 231 this.sendTaskFunctionNamesToMainWorker()
6703b9f4
JB
232 return { status: deleteStatus }
233 } catch (error) {
234 return { status: false, error: error as Error }
968a2e8c 235 }
968a2e8c
JB
236 }
237
238 /**
c50b93fb
JB
239 * Lists the names of the worker's task functions.
240 *
241 * @returns The names of the worker's task functions.
242 */
6703b9f4 243 public listTaskFunctionNames (): string[] {
b558f6b5
JB
244 const names: string[] = [...this.taskFunctions.keys()]
245 let defaultTaskFunctionName: string = DEFAULT_TASK_NAME
246 for (const [name, fn] of this.taskFunctions) {
247 if (
248 name !== DEFAULT_TASK_NAME &&
249 fn === this.taskFunctions.get(DEFAULT_TASK_NAME)
250 ) {
251 defaultTaskFunctionName = name
252 break
253 }
254 }
255 return [
256 names[names.indexOf(DEFAULT_TASK_NAME)],
257 defaultTaskFunctionName,
258 ...names.filter(
041dc05b 259 name => name !== DEFAULT_TASK_NAME && name !== defaultTaskFunctionName
b558f6b5
JB
260 )
261 ]
c50b93fb
JB
262 }
263
264 /**
265 * Sets the default task function to use in the worker.
968a2e8c
JB
266 *
267 * @param name - The name of the task function to use as default task function.
268 * @returns Whether the default task function was set or not.
968a2e8c 269 */
4e38fd21 270 public setDefaultTaskFunction (name: string): TaskFunctionOperationResult {
968a2e8c 271 try {
9a38f99e 272 checkTaskFunctionName(name)
6703b9f4
JB
273 if (name === DEFAULT_TASK_NAME) {
274 throw new Error(
275 'Cannot set the default task function reserved name as the default task function'
276 )
277 }
278 if (!this.taskFunctions.has(name)) {
279 throw new Error(
280 'Cannot set the default task function to a non-existing task function'
281 )
282 }
968a2e8c
JB
283 this.taskFunctions.set(
284 DEFAULT_TASK_NAME,
82ea6492 285 this.taskFunctions.get(name) as TaskFunction<Data, Response>
968a2e8c 286 )
9eae3c69 287 this.sendTaskFunctionNamesToMainWorker()
6703b9f4
JB
288 return { status: true }
289 } catch (error) {
290 return { status: false, error: error as Error }
968a2e8c
JB
291 }
292 }
293
a038b517
JB
294 /**
295 * Handles the ready message sent by the main worker.
296 *
297 * @param message - The ready message.
298 */
299 protected abstract handleReadyMessage (message: MessageValue<Data>): void
300
aee46736
JB
301 /**
302 * Worker message listener.
303 *
6b813701 304 * @param message - The received message.
aee46736 305 */
85aeb3f3 306 protected messageListener (message: MessageValue<Data>): void {
9e746eec 307 this.checkMessageWorkerId(message)
310de0aa
JB
308 if (message.statistics != null) {
309 // Statistics message received
310 this.statistics = message.statistics
311 } else if (message.checkActive != null) {
312 // Check active message received
313 message.checkActive ? this.startCheckActive() : this.stopCheckActive()
6703b9f4
JB
314 } else if (message.taskFunctionOperation != null) {
315 // Task function operation message received
316 this.handleTaskFunctionOperationMessage(message)
310de0aa
JB
317 } else if (message.taskId != null && message.data != null) {
318 // Task message received
319 this.run(message)
320 } else if (message.kill === true) {
321 // Kill message received
322 this.handleKillMessage(message)
cf597bc5
JB
323 }
324 }
325
6703b9f4
JB
326 protected handleTaskFunctionOperationMessage (
327 message: MessageValue<Data>
328 ): void {
9eae3c69 329 const { taskFunctionOperation, taskFunctionName, taskFunction } = message
4e38fd21 330 let response!: TaskFunctionOperationResult
d2dd5ef5
JB
331 switch (taskFunctionOperation) {
332 case 'add':
333 response = this.addTaskFunction(
334 taskFunctionName as string,
335 // eslint-disable-next-line @typescript-eslint/no-implied-eval, no-new-func
336 new Function(`return ${taskFunction as string}`)() as TaskFunction<
337 Data,
338 Response
339 >
340 )
341 break
342 case 'remove':
343 response = this.removeTaskFunction(taskFunctionName as string)
344 break
345 case 'default':
346 response = this.setDefaultTaskFunction(taskFunctionName as string)
347 break
348 default:
349 response = { status: false, error: new Error('Unknown task operation') }
350 break
6703b9f4
JB
351 }
352 this.sendToMainWorker({
353 taskFunctionOperation,
354 taskFunctionOperationStatus: response.status,
adee6053
JB
355 taskFunctionName,
356 ...(!response.status &&
357 response?.error != null && {
358 workerError: {
359 name: taskFunctionName as string,
360 message: this.handleError(response.error as Error | string)
361 }
362 })
6703b9f4
JB
363 })
364 }
365
984dc9c8
JB
366 /**
367 * Handles a kill message sent by the main worker.
368 *
369 * @param message - The kill message.
370 */
371 protected handleKillMessage (message: MessageValue<Data>): void {
29d8b961 372 this.stopCheckActive()
07588f30 373 if (isAsyncFunction(this.opts.killHandler)) {
041dc05b 374 (this.opts.killHandler?.() as Promise<void>)
1e3214b6 375 .then(() => {
895b5341 376 this.sendToMainWorker({ kill: 'success' })
1e3214b6
JB
377 return null
378 })
379 .catch(() => {
895b5341 380 this.sendToMainWorker({ kill: 'failure' })
1e3214b6
JB
381 })
382 .finally(() => {
383 this.emitDestroy()
384 })
07588f30
JB
385 .catch(EMPTY_FUNCTION)
386 } else {
1e3214b6
JB
387 try {
388 // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
389 this.opts.killHandler?.() as void
895b5341 390 this.sendToMainWorker({ kill: 'success' })
7c8ac84e 391 } catch {
895b5341 392 this.sendToMainWorker({ kill: 'failure' })
1e3214b6
JB
393 } finally {
394 this.emitDestroy()
395 }
07588f30 396 }
984dc9c8
JB
397 }
398
9e746eec
JB
399 /**
400 * Check if the message worker id is set and matches the worker id.
401 *
402 * @param message - The message to check.
403 * @throws {@link https://nodejs.org/api/errors.html#class-error} If the message worker id is not set or does not match the worker id.
404 */
405 private checkMessageWorkerId (message: MessageValue<Data>): void {
406 if (message.workerId == null) {
407 throw new Error('Message worker id is not set')
408 } else if (message.workerId != null && message.workerId !== this.id) {
409 throw new Error(
410 `Message worker id ${message.workerId} does not match the worker id ${this.id}`
411 )
412 }
413 }
414
48487131 415 /**
b0a4db63 416 * Starts the worker check active interval.
48487131 417 */
b0a4db63 418 private startCheckActive (): void {
75d3401a 419 this.lastTaskTimestamp = performance.now()
b0a4db63
JB
420 this.activeInterval = setInterval(
421 this.checkActive.bind(this),
75d3401a 422 (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2
984dc9c8 423 )
75d3401a
JB
424 }
425
48487131 426 /**
b0a4db63 427 * Stops the worker check active interval.
48487131 428 */
b0a4db63 429 private stopCheckActive (): void {
c3f498b5
JB
430 if (this.activeInterval != null) {
431 clearInterval(this.activeInterval)
432 delete this.activeInterval
433 }
48487131
JB
434 }
435
436 /**
437 * Checks if the worker should be terminated, because its living too long.
438 */
b0a4db63 439 private checkActive (): void {
48487131
JB
440 if (
441 performance.now() - this.lastTaskTimestamp >
442 (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME)
443 ) {
895b5341 444 this.sendToMainWorker({ kill: this.opts.killBehavior })
48487131
JB
445 }
446 }
447
729c563d
S
448 /**
449 * Returns the main worker.
838898f1
S
450 *
451 * @returns Reference to the main worker.
155bb3de 452 * @throws {@link https://nodejs.org/api/errors.html#class-error} If the main worker is not set.
729c563d 453 */
838898f1 454 protected getMainWorker (): MainWorker {
78cea37e 455 if (this.mainWorker == null) {
e102732c 456 throw new Error('Main worker not set')
838898f1
S
457 }
458 return this.mainWorker
459 }
c97c7edb 460
729c563d 461 /**
aa9eede8 462 * Sends a message to main worker.
729c563d 463 *
38e795c1 464 * @param message - The response message.
729c563d 465 */
82f36766
JB
466 protected abstract sendToMainWorker (
467 message: MessageValue<Response, Data>
468 ): void
c97c7edb 469
90d7d101 470 /**
e81c38f2 471 * Sends task function names to the main worker.
90d7d101 472 */
e81c38f2 473 protected sendTaskFunctionNamesToMainWorker (): void {
90d7d101 474 this.sendToMainWorker({
895b5341 475 taskFunctionNames: this.listTaskFunctionNames()
90d7d101
JB
476 })
477 }
478
729c563d 479 /**
8accb8d5 480 * Handles an error and convert it to a string so it can be sent back to the main worker.
729c563d 481 *
6703b9f4 482 * @param error - The error raised by the worker.
ab80dc46 483 * @returns The error message.
729c563d 484 */
6703b9f4
JB
485 protected handleError (error: Error | string): string {
486 return error instanceof Error ? error.message : error
c97c7edb
S
487 }
488
5c4d16da
JB
489 /**
490 * Runs the given task.
491 *
492 * @param task - The task to execute.
5c4d16da
JB
493 */
494 protected run (task: Task<Data>): void {
9d2d0da1
JB
495 const { name, taskId, data } = task
496 const fn = this.taskFunctions.get(name ?? DEFAULT_TASK_NAME)
497 if (fn == null) {
498 this.sendToMainWorker({
6703b9f4 499 workerError: {
9d2d0da1
JB
500 name: name as string,
501 message: `Task function '${name as string}' not found`,
502 data
503 },
9d2d0da1
JB
504 taskId
505 })
506 return
507 }
5c4d16da
JB
508 if (isAsyncFunction(fn)) {
509 this.runInAsyncScope(this.runAsync.bind(this), this, fn, task)
510 } else {
511 this.runInAsyncScope(this.runSync.bind(this), this, fn, task)
512 }
513 }
514
729c563d 515 /**
4dd93fcf 516 * Runs the given task function synchronously.
729c563d 517 *
5c4d16da
JB
518 * @param fn - Task function that will be executed.
519 * @param task - Input data for the task function.
729c563d 520 */
70a4f5ea 521 protected runSync (
82ea6492 522 fn: TaskSyncFunction<Data, Response>,
5c4d16da 523 task: Task<Data>
c97c7edb 524 ): void {
310de0aa 525 const { name, taskId, data } = task
c97c7edb 526 try {
310de0aa
JB
527 let taskPerformance = this.beginTaskPerformance(name)
528 const res = fn(data)
d715b7bc 529 taskPerformance = this.endTaskPerformance(taskPerformance)
3fafb1b2
JB
530 this.sendToMainWorker({
531 data: res,
d715b7bc 532 taskPerformance,
310de0aa 533 taskId
3fafb1b2 534 })
6703b9f4 535 } catch (error) {
91ee39ed 536 this.sendToMainWorker({
6703b9f4 537 workerError: {
0628755c 538 name: name as string,
6703b9f4 539 message: this.handleError(error as Error | string),
310de0aa 540 data
82f36766 541 },
310de0aa 542 taskId
91ee39ed 543 })
6e9d10db 544 } finally {
c3f498b5 545 this.updateLastTaskTimestamp()
c97c7edb
S
546 }
547 }
548
729c563d 549 /**
4dd93fcf 550 * Runs the given task function asynchronously.
729c563d 551 *
5c4d16da
JB
552 * @param fn - Task function that will be executed.
553 * @param task - Input data for the task function.
729c563d 554 */
c97c7edb 555 protected runAsync (
82ea6492 556 fn: TaskAsyncFunction<Data, Response>,
5c4d16da 557 task: Task<Data>
c97c7edb 558 ): void {
310de0aa
JB
559 const { name, taskId, data } = task
560 let taskPerformance = this.beginTaskPerformance(name)
561 fn(data)
041dc05b 562 .then(res => {
d715b7bc 563 taskPerformance = this.endTaskPerformance(taskPerformance)
3fafb1b2
JB
564 this.sendToMainWorker({
565 data: res,
d715b7bc 566 taskPerformance,
310de0aa 567 taskId
3fafb1b2 568 })
04714ef7 569 return undefined
c97c7edb 570 })
6703b9f4 571 .catch(error => {
91ee39ed 572 this.sendToMainWorker({
6703b9f4 573 workerError: {
0628755c 574 name: name as string,
6703b9f4 575 message: this.handleError(error as Error | string),
310de0aa 576 data
82f36766 577 },
310de0aa 578 taskId
91ee39ed 579 })
6e9d10db
JB
580 })
581 .finally(() => {
c3f498b5 582 this.updateLastTaskTimestamp()
c97c7edb 583 })
6e9d10db 584 .catch(EMPTY_FUNCTION)
c97c7edb 585 }
ec8fd331 586
197b4aa5 587 private beginTaskPerformance (name?: string): TaskPerformance {
8a970421 588 this.checkStatistics()
62c15a68 589 return {
ff128cc9 590 name: name ?? DEFAULT_TASK_NAME,
1c6fe997 591 timestamp: performance.now(),
b6b32453 592 ...(this.statistics.elu && { elu: performance.eventLoopUtilization() })
62c15a68
JB
593 }
594 }
595
d9d31201
JB
596 private endTaskPerformance (
597 taskPerformance: TaskPerformance
598 ): TaskPerformance {
8a970421 599 this.checkStatistics()
62c15a68
JB
600 return {
601 ...taskPerformance,
b6b32453
JB
602 ...(this.statistics.runTime && {
603 runTime: performance.now() - taskPerformance.timestamp
604 }),
605 ...(this.statistics.elu && {
62c15a68 606 elu: performance.eventLoopUtilization(taskPerformance.elu)
b6b32453 607 })
62c15a68
JB
608 }
609 }
8a970421
JB
610
611 private checkStatistics (): void {
612 if (this.statistics == null) {
613 throw new Error('Performance statistics computation requirements not set')
614 }
615 }
c3f498b5
JB
616
617 private updateLastTaskTimestamp (): void {
29d8b961 618 if (this.activeInterval != null) {
c3f498b5
JB
619 this.lastTaskTimestamp = performance.now()
620 }
621 }
c97c7edb 622}