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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' | |
7b427d73 JB |
4 | import type { |
5 | MessageValue, | |
6 | TaskFunctions, | |
7 | WorkerAsyncFunction, | |
8 | WorkerFunction, | |
9 | WorkerSyncFunction | |
48ef9107 | 10 | } from '../utility-types' |
0d80593b | 11 | import { EMPTY_FUNCTION, isPlainObject } from '../utils' |
5919b303 | 12 | import type { KillBehavior, WorkerOptions } from './worker-options' |
1a81f8af | 13 | import { KillBehaviors } from './worker-options' |
4c35177b | 14 | |
ec8fd331 | 15 | const DEFAULT_FUNCTION_NAME = 'default' |
978aad6f | 16 | const DEFAULT_MAX_INACTIVE_TIME = 60000 |
1a81f8af | 17 | const DEFAULT_KILL_BEHAVIOR: KillBehavior = KillBehaviors.SOFT |
c97c7edb | 18 | |
729c563d | 19 | /** |
ea7a90d3 | 20 | * Base class that implements some shared logic for all poolifier workers. |
729c563d | 21 | * |
38e795c1 JB |
22 | * @typeParam MainWorker - Type of main worker. |
23 | * @typeParam Data - Type of data this worker receives from pool's execution. This can only be serializable data. | |
24 | * @typeParam Response - Type of response the worker sends back to the main worker. This can only be serializable data. | |
729c563d | 25 | */ |
c97c7edb | 26 | export abstract class AbstractWorker< |
838898f1 | 27 | MainWorker extends Worker | MessagePort, |
d3c8a1a8 S |
28 | Data = unknown, |
29 | Response = unknown | |
c97c7edb | 30 | > extends AsyncResource { |
a86b6df1 JB |
31 | /** |
32 | * Task function(s) processed by the worker when the pool's `execution` function is invoked. | |
33 | */ | |
34 | protected taskFunctions!: Map<string, WorkerFunction<Data, Response>> | |
729c563d S |
35 | /** |
36 | * Timestamp of the last task processed by this worker. | |
37 | */ | |
a9d9ea34 | 38 | protected lastTaskTimestamp!: number |
729c563d | 39 | /** |
aee46736 | 40 | * Handler id of the `aliveInterval` worker alive check. |
729c563d | 41 | */ |
e088a00c | 42 | protected readonly aliveInterval?: NodeJS.Timeout |
c97c7edb | 43 | /** |
729c563d | 44 | * Constructs a new poolifier worker. |
c97c7edb | 45 | * |
38e795c1 JB |
46 | * @param type - The type of async event. |
47 | * @param isMain - Whether this is the main worker or not. | |
82888165 | 48 | * @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 |
49 | * @param mainWorker - Reference to main worker. |
50 | * @param opts - Options for the worker. | |
c97c7edb S |
51 | */ |
52 | public constructor ( | |
53 | type: string, | |
c2ade475 | 54 | protected readonly isMain: boolean, |
a86b6df1 JB |
55 | taskFunctions: |
56 | | WorkerFunction<Data, Response> | |
57 | | TaskFunctions<Data, Response>, | |
7e0d447f | 58 | protected mainWorker: MainWorker | undefined | null, |
d99ba5a8 | 59 | protected readonly opts: WorkerOptions = { |
e088a00c | 60 | /** |
aee46736 | 61 | * The kill behavior option on this worker or its default value. |
e088a00c | 62 | */ |
1a81f8af | 63 | killBehavior: DEFAULT_KILL_BEHAVIOR, |
e088a00c JB |
64 | /** |
65 | * The maximum time to keep this worker alive while idle. | |
66 | * The pool automatically checks and terminates this worker when the time expires. | |
67 | */ | |
1a81f8af | 68 | maxInactiveTime: DEFAULT_MAX_INACTIVE_TIME |
4c35177b | 69 | } |
c97c7edb S |
70 | ) { |
71 | super(type) | |
e088a00c | 72 | this.checkWorkerOptions(this.opts) |
a86b6df1 | 73 | this.checkTaskFunctions(taskFunctions) |
0e05c4dc JB |
74 | if ( |
75 | !this.isMain && | |
76 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) > 0 | |
77 | ) { | |
3fafb1b2 | 78 | this.lastTaskTimestamp = performance.now() |
e088a00c | 79 | this.aliveInterval = setInterval( |
c97c7edb | 80 | this.checkAlive.bind(this), |
e088a00c | 81 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2 |
c97c7edb S |
82 | ) |
83 | this.checkAlive.bind(this)() | |
84 | } | |
838898f1 | 85 | |
82888165 | 86 | this.mainWorker?.on('message', this.messageListener.bind(this)) |
c97c7edb S |
87 | } |
88 | ||
41aa7dcd JB |
89 | private checkWorkerOptions (opts: WorkerOptions): void { |
90 | this.opts.killBehavior = opts.killBehavior ?? DEFAULT_KILL_BEHAVIOR | |
91 | this.opts.maxInactiveTime = | |
92 | opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME | |
571227f4 | 93 | delete this.opts.async |
41aa7dcd JB |
94 | } |
95 | ||
96 | /** | |
a86b6df1 | 97 | * Checks if the `taskFunctions` parameter is passed to the constructor. |
41aa7dcd | 98 | * |
82888165 | 99 | * @param taskFunctions - The task function(s) parameter that should be checked. |
41aa7dcd | 100 | */ |
a86b6df1 JB |
101 | private checkTaskFunctions ( |
102 | taskFunctions: | |
103 | | WorkerFunction<Data, Response> | |
104 | | TaskFunctions<Data, Response> | |
105 | ): void { | |
ec8fd331 JB |
106 | if (taskFunctions == null) { |
107 | throw new Error('taskFunctions parameter is mandatory') | |
108 | } | |
a86b6df1 | 109 | this.taskFunctions = new Map<string, WorkerFunction<Data, Response>>() |
0d80593b JB |
110 | if (typeof taskFunctions === 'function') { |
111 | this.taskFunctions.set(DEFAULT_FUNCTION_NAME, taskFunctions.bind(this)) | |
112 | } else if (isPlainObject(taskFunctions)) { | |
82888165 | 113 | let firstEntry = true |
a86b6df1 JB |
114 | for (const [name, fn] of Object.entries(taskFunctions)) { |
115 | if (typeof fn !== 'function') { | |
0d80593b | 116 | throw new TypeError( |
a86b6df1 JB |
117 | 'A taskFunctions parameter object value is not a function' |
118 | ) | |
119 | } | |
120 | this.taskFunctions.set(name, fn.bind(this)) | |
82888165 JB |
121 | if (firstEntry) { |
122 | this.taskFunctions.set(DEFAULT_FUNCTION_NAME, fn.bind(this)) | |
123 | firstEntry = false | |
124 | } | |
a86b6df1 | 125 | } |
630f0acf JB |
126 | if (firstEntry) { |
127 | throw new Error('taskFunctions parameter object is empty') | |
128 | } | |
a86b6df1 | 129 | } else { |
f34fdabe JB |
130 | throw new TypeError( |
131 | 'taskFunctions parameter is not a function or a plain object' | |
132 | ) | |
41aa7dcd JB |
133 | } |
134 | } | |
135 | ||
aee46736 JB |
136 | /** |
137 | * Worker message listener. | |
138 | * | |
139 | * @param message - Message received. | |
aee46736 | 140 | */ |
a86b6df1 | 141 | protected messageListener (message: MessageValue<Data, MainWorker>): void { |
a3f5f781 | 142 | if (message.id != null && message.data != null) { |
aee46736 | 143 | // Task message received |
c7c04698 | 144 | const fn = this.getTaskFunction(message.name) |
a86b6df1 | 145 | if (fn?.constructor.name === 'AsyncFunction') { |
aee46736 | 146 | this.runInAsyncScope(this.runAsync.bind(this), this, fn, message) |
cf597bc5 | 147 | } else { |
70a4f5ea | 148 | this.runInAsyncScope(this.runSync.bind(this), this, fn, message) |
cf597bc5 | 149 | } |
aee46736 JB |
150 | } else if (message.parent != null) { |
151 | // Main worker reference message received | |
152 | this.mainWorker = message.parent | |
153 | } else if (message.kill != null) { | |
154 | // Kill message received | |
73cff87e | 155 | this.aliveInterval != null && clearInterval(this.aliveInterval) |
cf597bc5 JB |
156 | this.emitDestroy() |
157 | } | |
158 | } | |
159 | ||
729c563d S |
160 | /** |
161 | * Returns the main worker. | |
838898f1 S |
162 | * |
163 | * @returns Reference to the main worker. | |
729c563d | 164 | */ |
838898f1 | 165 | protected getMainWorker (): MainWorker { |
78cea37e | 166 | if (this.mainWorker == null) { |
838898f1 S |
167 | throw new Error('Main worker was not set') |
168 | } | |
169 | return this.mainWorker | |
170 | } | |
c97c7edb | 171 | |
729c563d | 172 | /** |
8accb8d5 | 173 | * Sends a message to the main worker. |
729c563d | 174 | * |
38e795c1 | 175 | * @param message - The response message. |
729c563d | 176 | */ |
c97c7edb S |
177 | protected abstract sendToMainWorker (message: MessageValue<Response>): void |
178 | ||
729c563d | 179 | /** |
a05c10de | 180 | * Checks if the worker should be terminated, because its living too long. |
729c563d | 181 | */ |
c97c7edb | 182 | protected checkAlive (): void { |
e088a00c | 183 | if ( |
3fafb1b2 | 184 | performance.now() - this.lastTaskTimestamp > |
e088a00c JB |
185 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) |
186 | ) { | |
187 | this.sendToMainWorker({ kill: this.opts.killBehavior }) | |
c97c7edb S |
188 | } |
189 | } | |
190 | ||
729c563d | 191 | /** |
8accb8d5 | 192 | * Handles an error and convert it to a string so it can be sent back to the main worker. |
729c563d | 193 | * |
38e795c1 | 194 | * @param e - The error raised by the worker. |
50eceb07 | 195 | * @returns Message of the error. |
729c563d | 196 | */ |
c97c7edb | 197 | protected handleError (e: Error | string): string { |
4a34343d | 198 | return e as string |
c97c7edb S |
199 | } |
200 | ||
729c563d | 201 | /** |
8accb8d5 | 202 | * Runs the given function synchronously. |
729c563d | 203 | * |
38e795c1 | 204 | * @param fn - Function that will be executed. |
aee46736 | 205 | * @param message - Input data for the given function. |
729c563d | 206 | */ |
70a4f5ea | 207 | protected runSync ( |
48ef9107 | 208 | fn: WorkerSyncFunction<Data, Response>, |
aee46736 | 209 | message: MessageValue<Data> |
c97c7edb S |
210 | ): void { |
211 | try { | |
3fafb1b2 | 212 | const startTimestamp = performance.now() |
09a6305f | 213 | const waitTime = startTimestamp - (message.submissionTimestamp ?? 0) |
aee46736 | 214 | const res = fn(message.data) |
3fafb1b2 JB |
215 | const runTime = performance.now() - startTimestamp |
216 | this.sendToMainWorker({ | |
217 | data: res, | |
218 | id: message.id, | |
09a6305f JB |
219 | runTime, |
220 | waitTime | |
3fafb1b2 | 221 | }) |
c97c7edb | 222 | } catch (e) { |
0a23f635 | 223 | const err = this.handleError(e as Error) |
aee46736 | 224 | this.sendToMainWorker({ error: err, id: message.id }) |
6e9d10db | 225 | } finally { |
3fafb1b2 | 226 | !this.isMain && (this.lastTaskTimestamp = performance.now()) |
c97c7edb S |
227 | } |
228 | } | |
229 | ||
729c563d | 230 | /** |
8accb8d5 | 231 | * Runs the given function asynchronously. |
729c563d | 232 | * |
38e795c1 | 233 | * @param fn - Function that will be executed. |
aee46736 | 234 | * @param message - Input data for the given function. |
729c563d | 235 | */ |
c97c7edb | 236 | protected runAsync ( |
48ef9107 | 237 | fn: WorkerAsyncFunction<Data, Response>, |
aee46736 | 238 | message: MessageValue<Data> |
c97c7edb | 239 | ): void { |
3fafb1b2 | 240 | const startTimestamp = performance.now() |
09a6305f | 241 | const waitTime = startTimestamp - (message.submissionTimestamp ?? 0) |
aee46736 | 242 | fn(message.data) |
c97c7edb | 243 | .then(res => { |
3fafb1b2 JB |
244 | const runTime = performance.now() - startTimestamp |
245 | this.sendToMainWorker({ | |
246 | data: res, | |
247 | id: message.id, | |
09a6305f JB |
248 | runTime, |
249 | waitTime | |
3fafb1b2 | 250 | }) |
c97c7edb S |
251 | return null |
252 | }) | |
253 | .catch(e => { | |
f3636726 | 254 | const err = this.handleError(e as Error) |
aee46736 | 255 | this.sendToMainWorker({ error: err, id: message.id }) |
6e9d10db JB |
256 | }) |
257 | .finally(() => { | |
3fafb1b2 | 258 | !this.isMain && (this.lastTaskTimestamp = performance.now()) |
c97c7edb | 259 | }) |
6e9d10db | 260 | .catch(EMPTY_FUNCTION) |
c97c7edb | 261 | } |
ec8fd331 | 262 | |
82888165 JB |
263 | /** |
264 | * Gets the task function in the given scope. | |
265 | * | |
266 | * @param name - Name of the function that will be returned. | |
267 | */ | |
ec8fd331 JB |
268 | private getTaskFunction (name?: string): WorkerFunction<Data, Response> { |
269 | name = name ?? DEFAULT_FUNCTION_NAME | |
270 | const fn = this.taskFunctions.get(name) | |
271 | if (fn == null) { | |
ace229a1 | 272 | throw new Error(`Task function '${name}' not found`) |
ec8fd331 JB |
273 | } |
274 | return fn | |
275 | } | |
c97c7edb | 276 | } |