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fc3e6586 JB |
1 | import { AsyncResource } from 'node:async_hooks' |
2 | import type { Worker } from 'node:cluster' | |
3 | import type { MessagePort } from 'node:worker_threads' | |
d715b7bc JB |
4 | import { performance } from 'node:perf_hooks' |
5 | import type { | |
6 | MessageValue, | |
7 | TaskPerformance, | |
8 | WorkerStatistics | |
9 | } from '../utility-types' | |
0d80593b | 10 | import { EMPTY_FUNCTION, isPlainObject } from '../utils' |
241f23c2 JB |
11 | import { |
12 | type KillBehavior, | |
13 | KillBehaviors, | |
14 | type WorkerOptions | |
15 | } from './worker-options' | |
b6b32453 JB |
16 | import type { |
17 | TaskFunctions, | |
18 | WorkerAsyncFunction, | |
19 | WorkerFunction, | |
20 | WorkerSyncFunction | |
21 | } from './worker-functions' | |
4c35177b | 22 | |
ec8fd331 | 23 | const DEFAULT_FUNCTION_NAME = 'default' |
978aad6f | 24 | const DEFAULT_MAX_INACTIVE_TIME = 60000 |
1a81f8af | 25 | const DEFAULT_KILL_BEHAVIOR: KillBehavior = KillBehaviors.SOFT |
c97c7edb | 26 | |
729c563d | 27 | /** |
ea7a90d3 | 28 | * Base class that implements some shared logic for all poolifier workers. |
729c563d | 29 | * |
38e795c1 JB |
30 | * @typeParam MainWorker - Type of main worker. |
31 | * @typeParam Data - Type of data this worker receives from pool's execution. This can only be serializable data. | |
32 | * @typeParam Response - Type of response the worker sends back to the main worker. This can only be serializable data. | |
729c563d | 33 | */ |
c97c7edb | 34 | export abstract class AbstractWorker< |
838898f1 | 35 | MainWorker extends Worker | MessagePort, |
d3c8a1a8 S |
36 | Data = unknown, |
37 | Response = unknown | |
c97c7edb | 38 | > extends AsyncResource { |
a86b6df1 JB |
39 | /** |
40 | * Task function(s) processed by the worker when the pool's `execution` function is invoked. | |
41 | */ | |
42 | protected taskFunctions!: Map<string, WorkerFunction<Data, Response>> | |
729c563d S |
43 | /** |
44 | * Timestamp of the last task processed by this worker. | |
45 | */ | |
a9d9ea34 | 46 | protected lastTaskTimestamp!: number |
b6b32453 JB |
47 | /** |
48 | * Performance statistics computation. | |
49 | */ | |
50 | protected statistics!: WorkerStatistics | |
729c563d | 51 | /** |
aee46736 | 52 | * Handler id of the `aliveInterval` worker alive check. |
729c563d | 53 | */ |
e088a00c | 54 | protected readonly aliveInterval?: NodeJS.Timeout |
c97c7edb | 55 | /** |
729c563d | 56 | * Constructs a new poolifier worker. |
c97c7edb | 57 | * |
38e795c1 JB |
58 | * @param type - The type of async event. |
59 | * @param isMain - Whether this is the main worker or not. | |
82888165 | 60 | * @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 JB |
61 | * @param mainWorker - Reference to main worker. |
62 | * @param opts - Options for the worker. | |
c97c7edb S |
63 | */ |
64 | public constructor ( | |
65 | type: string, | |
c2ade475 | 66 | protected readonly isMain: boolean, |
a86b6df1 JB |
67 | taskFunctions: |
68 | | WorkerFunction<Data, Response> | |
69 | | TaskFunctions<Data, Response>, | |
7e0d447f | 70 | protected mainWorker: MainWorker | undefined | null, |
d99ba5a8 | 71 | protected readonly opts: WorkerOptions = { |
e088a00c | 72 | /** |
aee46736 | 73 | * The kill behavior option on this worker or its default value. |
e088a00c | 74 | */ |
1a81f8af | 75 | killBehavior: DEFAULT_KILL_BEHAVIOR, |
e088a00c JB |
76 | /** |
77 | * The maximum time to keep this worker alive while idle. | |
78 | * The pool automatically checks and terminates this worker when the time expires. | |
79 | */ | |
1a81f8af | 80 | maxInactiveTime: DEFAULT_MAX_INACTIVE_TIME |
4c35177b | 81 | } |
c97c7edb S |
82 | ) { |
83 | super(type) | |
e088a00c | 84 | this.checkWorkerOptions(this.opts) |
a86b6df1 | 85 | this.checkTaskFunctions(taskFunctions) |
1f68cede | 86 | if (!this.isMain) { |
3fafb1b2 | 87 | this.lastTaskTimestamp = performance.now() |
e088a00c | 88 | this.aliveInterval = setInterval( |
c97c7edb | 89 | this.checkAlive.bind(this), |
e088a00c | 90 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2 |
c97c7edb S |
91 | ) |
92 | this.checkAlive.bind(this)() | |
93 | } | |
82888165 | 94 | this.mainWorker?.on('message', this.messageListener.bind(this)) |
c97c7edb S |
95 | } |
96 | ||
41aa7dcd JB |
97 | private checkWorkerOptions (opts: WorkerOptions): void { |
98 | this.opts.killBehavior = opts.killBehavior ?? DEFAULT_KILL_BEHAVIOR | |
99 | this.opts.maxInactiveTime = | |
100 | opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME | |
571227f4 | 101 | delete this.opts.async |
41aa7dcd JB |
102 | } |
103 | ||
104 | /** | |
a86b6df1 | 105 | * Checks if the `taskFunctions` parameter is passed to the constructor. |
41aa7dcd | 106 | * |
82888165 | 107 | * @param taskFunctions - The task function(s) parameter that should be checked. |
41aa7dcd | 108 | */ |
a86b6df1 JB |
109 | private checkTaskFunctions ( |
110 | taskFunctions: | |
111 | | WorkerFunction<Data, Response> | |
112 | | TaskFunctions<Data, Response> | |
113 | ): void { | |
ec8fd331 JB |
114 | if (taskFunctions == null) { |
115 | throw new Error('taskFunctions parameter is mandatory') | |
116 | } | |
a86b6df1 | 117 | this.taskFunctions = new Map<string, WorkerFunction<Data, Response>>() |
0d80593b JB |
118 | if (typeof taskFunctions === 'function') { |
119 | this.taskFunctions.set(DEFAULT_FUNCTION_NAME, taskFunctions.bind(this)) | |
120 | } else if (isPlainObject(taskFunctions)) { | |
82888165 | 121 | let firstEntry = true |
a86b6df1 JB |
122 | for (const [name, fn] of Object.entries(taskFunctions)) { |
123 | if (typeof fn !== 'function') { | |
0d80593b | 124 | throw new TypeError( |
a86b6df1 JB |
125 | 'A taskFunctions parameter object value is not a function' |
126 | ) | |
127 | } | |
128 | this.taskFunctions.set(name, fn.bind(this)) | |
82888165 JB |
129 | if (firstEntry) { |
130 | this.taskFunctions.set(DEFAULT_FUNCTION_NAME, fn.bind(this)) | |
131 | firstEntry = false | |
132 | } | |
a86b6df1 | 133 | } |
630f0acf JB |
134 | if (firstEntry) { |
135 | throw new Error('taskFunctions parameter object is empty') | |
136 | } | |
a86b6df1 | 137 | } else { |
f34fdabe JB |
138 | throw new TypeError( |
139 | 'taskFunctions parameter is not a function or a plain object' | |
140 | ) | |
41aa7dcd JB |
141 | } |
142 | } | |
143 | ||
aee46736 JB |
144 | /** |
145 | * Worker message listener. | |
146 | * | |
147 | * @param message - Message received. | |
aee46736 | 148 | */ |
82f36766 JB |
149 | protected messageListener ( |
150 | message: MessageValue<Data, Data, MainWorker> | |
151 | ): void { | |
a3f5f781 | 152 | if (message.id != null && message.data != null) { |
aee46736 | 153 | // Task message received |
c7c04698 | 154 | const fn = this.getTaskFunction(message.name) |
a86b6df1 | 155 | if (fn?.constructor.name === 'AsyncFunction') { |
aee46736 | 156 | this.runInAsyncScope(this.runAsync.bind(this), this, fn, message) |
cf597bc5 | 157 | } else { |
70a4f5ea | 158 | this.runInAsyncScope(this.runSync.bind(this), this, fn, message) |
cf597bc5 | 159 | } |
aee46736 JB |
160 | } else if (message.parent != null) { |
161 | // Main worker reference message received | |
162 | this.mainWorker = message.parent | |
b9907d18 JB |
163 | } else if (message.statistics != null) { |
164 | // Statistics message received | |
165 | this.statistics = message.statistics | |
aee46736 JB |
166 | } else if (message.kill != null) { |
167 | // Kill message received | |
73cff87e | 168 | this.aliveInterval != null && clearInterval(this.aliveInterval) |
cf597bc5 JB |
169 | this.emitDestroy() |
170 | } | |
171 | } | |
172 | ||
729c563d S |
173 | /** |
174 | * Returns the main worker. | |
838898f1 S |
175 | * |
176 | * @returns Reference to the main worker. | |
729c563d | 177 | */ |
838898f1 | 178 | protected getMainWorker (): MainWorker { |
78cea37e | 179 | if (this.mainWorker == null) { |
838898f1 S |
180 | throw new Error('Main worker was not set') |
181 | } | |
182 | return this.mainWorker | |
183 | } | |
c97c7edb | 184 | |
729c563d | 185 | /** |
8accb8d5 | 186 | * Sends a message to the main worker. |
729c563d | 187 | * |
38e795c1 | 188 | * @param message - The response message. |
729c563d | 189 | */ |
82f36766 JB |
190 | protected abstract sendToMainWorker ( |
191 | message: MessageValue<Response, Data> | |
192 | ): void | |
c97c7edb | 193 | |
729c563d | 194 | /** |
a05c10de | 195 | * Checks if the worker should be terminated, because its living too long. |
729c563d | 196 | */ |
c97c7edb | 197 | protected checkAlive (): void { |
e088a00c | 198 | if ( |
3fafb1b2 | 199 | performance.now() - this.lastTaskTimestamp > |
e088a00c JB |
200 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) |
201 | ) { | |
202 | this.sendToMainWorker({ kill: this.opts.killBehavior }) | |
c97c7edb S |
203 | } |
204 | } | |
205 | ||
729c563d | 206 | /** |
8accb8d5 | 207 | * Handles an error and convert it to a string so it can be sent back to the main worker. |
729c563d | 208 | * |
38e795c1 | 209 | * @param e - The error raised by the worker. |
50eceb07 | 210 | * @returns Message of the error. |
729c563d | 211 | */ |
c97c7edb | 212 | protected handleError (e: Error | string): string { |
4a34343d | 213 | return e as string |
c97c7edb S |
214 | } |
215 | ||
729c563d | 216 | /** |
8accb8d5 | 217 | * Runs the given function synchronously. |
729c563d | 218 | * |
38e795c1 | 219 | * @param fn - Function that will be executed. |
aee46736 | 220 | * @param message - Input data for the given function. |
729c563d | 221 | */ |
70a4f5ea | 222 | protected runSync ( |
48ef9107 | 223 | fn: WorkerSyncFunction<Data, Response>, |
aee46736 | 224 | message: MessageValue<Data> |
c97c7edb S |
225 | ): void { |
226 | try { | |
1c6fe997 | 227 | let taskPerformance = this.beginTaskPerformance() |
aee46736 | 228 | const res = fn(message.data) |
d715b7bc | 229 | taskPerformance = this.endTaskPerformance(taskPerformance) |
3fafb1b2 JB |
230 | this.sendToMainWorker({ |
231 | data: res, | |
d715b7bc | 232 | taskPerformance, |
91ee39ed | 233 | id: message.id |
3fafb1b2 | 234 | }) |
c97c7edb | 235 | } catch (e) { |
0a23f635 | 236 | const err = this.handleError(e as Error) |
91ee39ed | 237 | this.sendToMainWorker({ |
82f36766 JB |
238 | taskError: { |
239 | message: err, | |
240 | data: message.data | |
241 | }, | |
91ee39ed JB |
242 | id: message.id |
243 | }) | |
6e9d10db | 244 | } finally { |
3fafb1b2 | 245 | !this.isMain && (this.lastTaskTimestamp = performance.now()) |
c97c7edb S |
246 | } |
247 | } | |
248 | ||
729c563d | 249 | /** |
8accb8d5 | 250 | * Runs the given function asynchronously. |
729c563d | 251 | * |
38e795c1 | 252 | * @param fn - Function that will be executed. |
aee46736 | 253 | * @param message - Input data for the given function. |
729c563d | 254 | */ |
c97c7edb | 255 | protected runAsync ( |
48ef9107 | 256 | fn: WorkerAsyncFunction<Data, Response>, |
aee46736 | 257 | message: MessageValue<Data> |
c97c7edb | 258 | ): void { |
1c6fe997 | 259 | let taskPerformance = this.beginTaskPerformance() |
aee46736 | 260 | fn(message.data) |
c97c7edb | 261 | .then(res => { |
d715b7bc | 262 | taskPerformance = this.endTaskPerformance(taskPerformance) |
3fafb1b2 JB |
263 | this.sendToMainWorker({ |
264 | data: res, | |
d715b7bc | 265 | taskPerformance, |
91ee39ed | 266 | id: message.id |
3fafb1b2 | 267 | }) |
c97c7edb S |
268 | return null |
269 | }) | |
270 | .catch(e => { | |
f3636726 | 271 | const err = this.handleError(e as Error) |
91ee39ed | 272 | this.sendToMainWorker({ |
82f36766 JB |
273 | taskError: { |
274 | message: err, | |
275 | data: message.data | |
276 | }, | |
91ee39ed JB |
277 | id: message.id |
278 | }) | |
6e9d10db JB |
279 | }) |
280 | .finally(() => { | |
3fafb1b2 | 281 | !this.isMain && (this.lastTaskTimestamp = performance.now()) |
c97c7edb | 282 | }) |
6e9d10db | 283 | .catch(EMPTY_FUNCTION) |
c97c7edb | 284 | } |
ec8fd331 | 285 | |
82888165 JB |
286 | /** |
287 | * Gets the task function in the given scope. | |
288 | * | |
289 | * @param name - Name of the function that will be returned. | |
290 | */ | |
ec8fd331 JB |
291 | private getTaskFunction (name?: string): WorkerFunction<Data, Response> { |
292 | name = name ?? DEFAULT_FUNCTION_NAME | |
293 | const fn = this.taskFunctions.get(name) | |
294 | if (fn == null) { | |
ace229a1 | 295 | throw new Error(`Task function '${name}' not found`) |
ec8fd331 JB |
296 | } |
297 | return fn | |
298 | } | |
62c15a68 | 299 | |
1c6fe997 | 300 | private beginTaskPerformance (): TaskPerformance { |
62c15a68 | 301 | return { |
1c6fe997 | 302 | timestamp: performance.now(), |
b6b32453 | 303 | ...(this.statistics.elu && { elu: performance.eventLoopUtilization() }) |
62c15a68 JB |
304 | } |
305 | } | |
306 | ||
d9d31201 JB |
307 | private endTaskPerformance ( |
308 | taskPerformance: TaskPerformance | |
309 | ): TaskPerformance { | |
62c15a68 JB |
310 | return { |
311 | ...taskPerformance, | |
b6b32453 JB |
312 | ...(this.statistics.runTime && { |
313 | runTime: performance.now() - taskPerformance.timestamp | |
314 | }), | |
315 | ...(this.statistics.elu && { | |
62c15a68 | 316 | elu: performance.eventLoopUtilization(taskPerformance.elu) |
b6b32453 | 317 | }) |
62c15a68 JB |
318 | } |
319 | } | |
c97c7edb | 320 | } |