build(deps-dev): bump rollup
[poolifier.git] / src / pools / worker-node.ts
1 import { MessageChannel } from 'node:worker_threads'
2 import { CircularArray } from '../circular-array'
3 import type { Task } from '../utility-types'
4 import {
5 DEFAULT_TASK_NAME,
6 EMPTY_FUNCTION,
7 exponentialDelay,
8 getWorkerId,
9 getWorkerType,
10 sleep
11 } from '../utils'
12 import { Deque } from '../deque'
13 import {
14 type IWorker,
15 type IWorkerNode,
16 type StrategyData,
17 type WorkerInfo,
18 type WorkerNodeEventCallback,
19 type WorkerType,
20 WorkerTypes,
21 type WorkerUsage
22 } from './worker'
23
24 /**
25 * Worker node.
26 *
27 * @typeParam Worker - Type of worker.
28 * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
29 */
30 export class WorkerNode<Worker extends IWorker, Data = unknown>
31 implements IWorkerNode<Worker, Data> {
32 /** @inheritdoc */
33 public readonly worker: Worker
34 /** @inheritdoc */
35 public readonly info: WorkerInfo
36 /** @inheritdoc */
37 public usage: WorkerUsage
38 /** @inheritdoc */
39 public strategyData?: StrategyData
40 /** @inheritdoc */
41 public messageChannel?: MessageChannel
42 /** @inheritdoc */
43 public tasksQueueBackPressureSize: number
44 /** @inheritdoc */
45 public onBackPressure?: WorkerNodeEventCallback
46 /** @inheritdoc */
47 public onEmptyQueue?: WorkerNodeEventCallback
48 private readonly tasksQueue: Deque<Task<Data>>
49 private onEmptyQueueCount: number
50 private readonly taskFunctionsUsage: Map<string, WorkerUsage>
51
52 /**
53 * Constructs a new worker node.
54 *
55 * @param worker - The worker.
56 * @param tasksQueueBackPressureSize - The tasks queue back pressure size.
57 */
58 constructor (worker: Worker, tasksQueueBackPressureSize: number) {
59 this.checkWorkerNodeArguments(worker, tasksQueueBackPressureSize)
60 this.worker = worker
61 this.info = this.initWorkerInfo(worker)
62 this.usage = this.initWorkerUsage()
63 if (this.info.type === WorkerTypes.thread) {
64 this.messageChannel = new MessageChannel()
65 }
66 this.tasksQueueBackPressureSize = tasksQueueBackPressureSize
67 this.tasksQueue = new Deque<Task<Data>>()
68 this.onEmptyQueueCount = 0
69 this.taskFunctionsUsage = new Map<string, WorkerUsage>()
70 }
71
72 /** @inheritdoc */
73 public tasksQueueSize (): number {
74 return this.tasksQueue.size
75 }
76
77 /** @inheritdoc */
78 public enqueueTask (task: Task<Data>): number {
79 const tasksQueueSize = this.tasksQueue.push(task)
80 if (this.onBackPressure != null && this.hasBackPressure()) {
81 this.onBackPressure(this.info.id as number)
82 }
83 return tasksQueueSize
84 }
85
86 /** @inheritdoc */
87 public unshiftTask (task: Task<Data>): number {
88 const tasksQueueSize = this.tasksQueue.unshift(task)
89 if (this.onBackPressure != null && this.hasBackPressure()) {
90 this.onBackPressure(this.info.id as number)
91 }
92 return tasksQueueSize
93 }
94
95 /** @inheritdoc */
96 public dequeueTask (): Task<Data> | undefined {
97 const task = this.tasksQueue.shift()
98 if (this.onEmptyQueue != null && this.tasksQueue.size === 0) {
99 this.startOnEmptyQueue().catch(EMPTY_FUNCTION)
100 }
101 return task
102 }
103
104 /** @inheritdoc */
105 public popTask (): Task<Data> | undefined {
106 const task = this.tasksQueue.pop()
107 if (this.onEmptyQueue != null && this.tasksQueue.size === 0) {
108 this.startOnEmptyQueue().catch(EMPTY_FUNCTION)
109 }
110 return task
111 }
112
113 /** @inheritdoc */
114 public clearTasksQueue (): void {
115 this.tasksQueue.clear()
116 }
117
118 /** @inheritdoc */
119 public hasBackPressure (): boolean {
120 return this.tasksQueue.size >= this.tasksQueueBackPressureSize
121 }
122
123 /** @inheritdoc */
124 public resetUsage (): void {
125 this.usage = this.initWorkerUsage()
126 this.taskFunctionsUsage.clear()
127 }
128
129 /** @inheritdoc */
130 public closeChannel (): void {
131 if (this.messageChannel != null) {
132 this.messageChannel?.port1.unref()
133 this.messageChannel?.port2.unref()
134 this.messageChannel?.port1.close()
135 this.messageChannel?.port2.close()
136 delete this.messageChannel
137 }
138 }
139
140 /** @inheritdoc */
141 public getTaskFunctionWorkerUsage (name: string): WorkerUsage | undefined {
142 if (!Array.isArray(this.info.taskFunctions)) {
143 throw new Error(
144 `Cannot get task function worker usage for task function name '${name}' when task function names list is not yet defined`
145 )
146 }
147 if (
148 Array.isArray(this.info.taskFunctions) &&
149 this.info.taskFunctions.length < 3
150 ) {
151 throw new Error(
152 `Cannot get task function worker usage for task function name '${name}' when task function names list has less than 3 elements`
153 )
154 }
155 if (name === DEFAULT_TASK_NAME) {
156 name = this.info.taskFunctions[1]
157 }
158 if (!this.taskFunctionsUsage.has(name)) {
159 this.taskFunctionsUsage.set(name, this.initTaskFunctionWorkerUsage(name))
160 }
161 return this.taskFunctionsUsage.get(name)
162 }
163
164 private async startOnEmptyQueue (): Promise<void> {
165 if (
166 this.onEmptyQueueCount > 0 &&
167 (this.usage.tasks.executing > 0 || this.tasksQueue.size > 0)
168 ) {
169 this.onEmptyQueueCount = 0
170 return
171 }
172 (this.onEmptyQueue as WorkerNodeEventCallback)(this.info.id as number)
173 ++this.onEmptyQueueCount
174 await sleep(exponentialDelay(this.onEmptyQueueCount))
175 await this.startOnEmptyQueue()
176 }
177
178 private initWorkerInfo (worker: Worker): WorkerInfo {
179 return {
180 id: getWorkerId(worker),
181 type: getWorkerType(worker) as WorkerType,
182 dynamic: false,
183 ready: false
184 }
185 }
186
187 private initWorkerUsage (): WorkerUsage {
188 const getTasksQueueSize = (): number => {
189 return this.tasksQueue.size
190 }
191 const getTasksQueueMaxSize = (): number => {
192 return this.tasksQueue.maxSize
193 }
194 return {
195 tasks: {
196 executed: 0,
197 executing: 0,
198 get queued (): number {
199 return getTasksQueueSize()
200 },
201 get maxQueued (): number {
202 return getTasksQueueMaxSize()
203 },
204 stolen: 0,
205 failed: 0
206 },
207 runTime: {
208 history: new CircularArray()
209 },
210 waitTime: {
211 history: new CircularArray()
212 },
213 elu: {
214 idle: {
215 history: new CircularArray()
216 },
217 active: {
218 history: new CircularArray()
219 }
220 }
221 }
222 }
223
224 private initTaskFunctionWorkerUsage (name: string): WorkerUsage {
225 const getTaskFunctionQueueSize = (): number => {
226 let taskFunctionQueueSize = 0
227 for (const task of this.tasksQueue) {
228 if (
229 (task.name === DEFAULT_TASK_NAME &&
230 name === (this.info.taskFunctions as string[])[1]) ||
231 (task.name !== DEFAULT_TASK_NAME && name === task.name)
232 ) {
233 ++taskFunctionQueueSize
234 }
235 }
236 return taskFunctionQueueSize
237 }
238 return {
239 tasks: {
240 executed: 0,
241 executing: 0,
242 get queued (): number {
243 return getTaskFunctionQueueSize()
244 },
245 stolen: 0,
246 failed: 0
247 },
248 runTime: {
249 history: new CircularArray()
250 },
251 waitTime: {
252 history: new CircularArray()
253 },
254 elu: {
255 idle: {
256 history: new CircularArray()
257 },
258 active: {
259 history: new CircularArray()
260 }
261 }
262 }
263 }
264
265 private checkWorkerNodeArguments (
266 worker: Worker,
267 tasksQueueBackPressureSize: number
268 ): void {
269 if (worker == null) {
270 throw new TypeError('Cannot construct a worker node without a worker')
271 }
272 if (tasksQueueBackPressureSize == null) {
273 throw new TypeError(
274 'Cannot construct a worker node without a tasks queue back pressure size'
275 )
276 }
277 if (!Number.isSafeInteger(tasksQueueBackPressureSize)) {
278 throw new TypeError(
279 'Cannot construct a worker node with a tasks queue back pressure size that is not an integer'
280 )
281 }
282 if (tasksQueueBackPressureSize <= 0) {
283 throw new RangeError(
284 'Cannot construct a worker node with a tasks queue back pressure size that is not a positive integer'
285 )
286 }
287 }
288 }