| 1 | import type { MessageChannel, WorkerOptions } from 'node:worker_threads' |
| 2 | import type { EventEmitter } from 'node:events' |
| 3 | import type { CircularArray } from '../circular-array.js' |
| 4 | import type { Task } from '../utility-types.js' |
| 5 | |
| 6 | /** |
| 7 | * Callback invoked when the worker has started successfully. |
| 8 | * |
| 9 | * @typeParam Worker - Type of worker. |
| 10 | */ |
| 11 | export type OnlineHandler<Worker extends IWorker> = (this: Worker) => void |
| 12 | |
| 13 | /** |
| 14 | * Callback invoked if the worker has received a message. |
| 15 | * |
| 16 | * @typeParam Worker - Type of worker. |
| 17 | */ |
| 18 | export type MessageHandler<Worker extends IWorker> = ( |
| 19 | this: Worker, |
| 20 | message: unknown |
| 21 | ) => void |
| 22 | |
| 23 | /** |
| 24 | * Callback invoked if the worker raised an error. |
| 25 | * |
| 26 | * @typeParam Worker - Type of worker. |
| 27 | */ |
| 28 | export type ErrorHandler<Worker extends IWorker> = ( |
| 29 | this: Worker, |
| 30 | error: Error |
| 31 | ) => void |
| 32 | |
| 33 | /** |
| 34 | * Callback invoked when the worker exits successfully. |
| 35 | * |
| 36 | * @typeParam Worker - Type of worker. |
| 37 | */ |
| 38 | export type ExitHandler<Worker extends IWorker> = ( |
| 39 | this: Worker, |
| 40 | exitCode: number |
| 41 | ) => void |
| 42 | |
| 43 | /** |
| 44 | * Worker event handler. |
| 45 | * |
| 46 | * @typeParam Worker - Type of worker. |
| 47 | */ |
| 48 | export type EventHandler<Worker extends IWorker> = |
| 49 | | OnlineHandler<Worker> |
| 50 | | MessageHandler<Worker> |
| 51 | | ErrorHandler<Worker> |
| 52 | | ExitHandler<Worker> |
| 53 | |
| 54 | /** |
| 55 | * Measurement statistics. |
| 56 | * |
| 57 | * @internal |
| 58 | */ |
| 59 | export interface MeasurementStatistics { |
| 60 | /** |
| 61 | * Measurement aggregate. |
| 62 | */ |
| 63 | aggregate?: number |
| 64 | /** |
| 65 | * Measurement minimum. |
| 66 | */ |
| 67 | minimum?: number |
| 68 | /** |
| 69 | * Measurement maximum. |
| 70 | */ |
| 71 | maximum?: number |
| 72 | /** |
| 73 | * Measurement average. |
| 74 | */ |
| 75 | average?: number |
| 76 | /** |
| 77 | * Measurement median. |
| 78 | */ |
| 79 | median?: number |
| 80 | /** |
| 81 | * Measurement history. |
| 82 | */ |
| 83 | readonly history: CircularArray<number> |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Event loop utilization measurement statistics. |
| 88 | * |
| 89 | * @internal |
| 90 | */ |
| 91 | export interface EventLoopUtilizationMeasurementStatistics { |
| 92 | readonly idle: MeasurementStatistics |
| 93 | readonly active: MeasurementStatistics |
| 94 | utilization?: number |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Task statistics. |
| 99 | * |
| 100 | * @internal |
| 101 | */ |
| 102 | export interface TaskStatistics { |
| 103 | /** |
| 104 | * Number of executed tasks. |
| 105 | */ |
| 106 | executed: number |
| 107 | /** |
| 108 | * Number of executing tasks. |
| 109 | */ |
| 110 | executing: number |
| 111 | /** |
| 112 | * Number of queued tasks. |
| 113 | */ |
| 114 | readonly queued: number |
| 115 | /** |
| 116 | * Maximum number of queued tasks. |
| 117 | */ |
| 118 | readonly maxQueued?: number |
| 119 | /** |
| 120 | * Number of sequentially stolen tasks. |
| 121 | */ |
| 122 | sequentiallyStolen: number |
| 123 | /** |
| 124 | * Number of stolen tasks. |
| 125 | */ |
| 126 | stolen: number |
| 127 | /** |
| 128 | * Number of failed tasks. |
| 129 | */ |
| 130 | failed: number |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Enumeration of worker types. |
| 135 | */ |
| 136 | export const WorkerTypes = Object.freeze({ |
| 137 | thread: 'thread', |
| 138 | cluster: 'cluster' |
| 139 | } as const) |
| 140 | |
| 141 | /** |
| 142 | * Worker type. |
| 143 | */ |
| 144 | export type WorkerType = keyof typeof WorkerTypes |
| 145 | |
| 146 | /** |
| 147 | * Worker information. |
| 148 | * |
| 149 | * @internal |
| 150 | */ |
| 151 | export interface WorkerInfo { |
| 152 | /** |
| 153 | * Worker id. |
| 154 | */ |
| 155 | readonly id: number | undefined |
| 156 | /** |
| 157 | * Worker type. |
| 158 | */ |
| 159 | readonly type: WorkerType |
| 160 | /** |
| 161 | * Dynamic flag. |
| 162 | */ |
| 163 | dynamic: boolean |
| 164 | /** |
| 165 | * Ready flag. |
| 166 | */ |
| 167 | ready: boolean |
| 168 | /** |
| 169 | * Stealing flag. |
| 170 | * This flag is set to `true` when worker node is stealing tasks from another worker node. |
| 171 | */ |
| 172 | stealing: boolean |
| 173 | /** |
| 174 | * Task function names. |
| 175 | */ |
| 176 | taskFunctionNames?: string[] |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Worker usage statistics. |
| 181 | * |
| 182 | * @internal |
| 183 | */ |
| 184 | export interface WorkerUsage { |
| 185 | /** |
| 186 | * Tasks statistics. |
| 187 | */ |
| 188 | readonly tasks: TaskStatistics |
| 189 | /** |
| 190 | * Tasks runtime statistics. |
| 191 | */ |
| 192 | readonly runTime: MeasurementStatistics |
| 193 | /** |
| 194 | * Tasks wait time statistics. |
| 195 | */ |
| 196 | readonly waitTime: MeasurementStatistics |
| 197 | /** |
| 198 | * Tasks event loop utilization statistics. |
| 199 | */ |
| 200 | readonly elu: EventLoopUtilizationMeasurementStatistics |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Worker choice strategy data. |
| 205 | * |
| 206 | * @internal |
| 207 | */ |
| 208 | export interface StrategyData { |
| 209 | virtualTaskEndTimestamp?: number |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Worker interface. |
| 214 | */ |
| 215 | export interface IWorker extends EventEmitter { |
| 216 | /** |
| 217 | * Cluster worker id. |
| 218 | */ |
| 219 | readonly id?: number |
| 220 | /** |
| 221 | * Worker thread worker id. |
| 222 | */ |
| 223 | readonly threadId?: number |
| 224 | /** |
| 225 | * Registers an event handler. |
| 226 | * |
| 227 | * @param event - The event. |
| 228 | * @param handler - The event handler. |
| 229 | */ |
| 230 | readonly on: (event: string, handler: EventHandler<this>) => this |
| 231 | /** |
| 232 | * Registers once an event handler. |
| 233 | * |
| 234 | * @param event - The event. |
| 235 | * @param handler - The event handler. |
| 236 | */ |
| 237 | readonly once: (event: string, handler: EventHandler<this>) => this |
| 238 | /** |
| 239 | * Stop all JavaScript execution in the worker thread as soon as possible. |
| 240 | * Returns a Promise for the exit code that is fulfilled when the `'exit' event` is emitted. |
| 241 | */ |
| 242 | readonly terminate?: () => Promise<number> |
| 243 | /** |
| 244 | * Cluster worker disconnect. |
| 245 | */ |
| 246 | readonly disconnect?: () => void |
| 247 | /** |
| 248 | * Cluster worker kill. |
| 249 | */ |
| 250 | readonly kill?: (signal?: string) => void |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Worker node options. |
| 255 | * |
| 256 | * @internal |
| 257 | */ |
| 258 | export interface WorkerNodeOptions { |
| 259 | workerOptions?: WorkerOptions |
| 260 | env?: Record<string, unknown> |
| 261 | tasksQueueBackPressureSize: number | undefined |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * Worker node interface. |
| 266 | * |
| 267 | * @typeParam Worker - Type of worker. |
| 268 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
| 269 | * @internal |
| 270 | */ |
| 271 | export interface IWorkerNode<Worker extends IWorker, Data = unknown> |
| 272 | extends EventEmitter { |
| 273 | /** |
| 274 | * Worker. |
| 275 | */ |
| 276 | readonly worker: Worker |
| 277 | /** |
| 278 | * Worker info. |
| 279 | */ |
| 280 | readonly info: WorkerInfo |
| 281 | /** |
| 282 | * Worker usage statistics. |
| 283 | */ |
| 284 | readonly usage: WorkerUsage |
| 285 | /** |
| 286 | * Worker choice strategy data. |
| 287 | * This is used to store data that are specific to the worker choice strategy. |
| 288 | */ |
| 289 | strategyData?: StrategyData |
| 290 | /** |
| 291 | * Message channel (worker thread only). |
| 292 | */ |
| 293 | readonly messageChannel?: MessageChannel |
| 294 | /** |
| 295 | * Tasks queue back pressure size. |
| 296 | * This is the number of tasks that can be enqueued before the worker node has back pressure. |
| 297 | */ |
| 298 | tasksQueueBackPressureSize: number |
| 299 | /** |
| 300 | * Tasks queue size. |
| 301 | * |
| 302 | * @returns The tasks queue size. |
| 303 | */ |
| 304 | readonly tasksQueueSize: () => number |
| 305 | /** |
| 306 | * Enqueue task. |
| 307 | * |
| 308 | * @param task - The task to queue. |
| 309 | * @returns The tasks queue size. |
| 310 | */ |
| 311 | readonly enqueueTask: (task: Task<Data>) => number |
| 312 | /** |
| 313 | * Prepends a task to the tasks queue. |
| 314 | * |
| 315 | * @param task - The task to prepend. |
| 316 | * @returns The tasks queue size. |
| 317 | */ |
| 318 | readonly unshiftTask: (task: Task<Data>) => number |
| 319 | /** |
| 320 | * Dequeue task. |
| 321 | * |
| 322 | * @returns The dequeued task. |
| 323 | */ |
| 324 | readonly dequeueTask: () => Task<Data> | undefined |
| 325 | /** |
| 326 | * Pops a task from the tasks queue. |
| 327 | * |
| 328 | * @returns The popped task. |
| 329 | */ |
| 330 | readonly popTask: () => Task<Data> | undefined |
| 331 | /** |
| 332 | * Clears tasks queue. |
| 333 | */ |
| 334 | readonly clearTasksQueue: () => void |
| 335 | /** |
| 336 | * Whether the worker node has back pressure (i.e. its tasks queue is full). |
| 337 | * |
| 338 | * @returns `true` if the worker node has back pressure, `false` otherwise. |
| 339 | */ |
| 340 | readonly hasBackPressure: () => boolean |
| 341 | /** |
| 342 | * Resets usage statistics. |
| 343 | */ |
| 344 | readonly resetUsage: () => void |
| 345 | /** |
| 346 | * Terminates the worker node. |
| 347 | */ |
| 348 | readonly terminate: () => Promise<void> |
| 349 | /** |
| 350 | * Registers a worker event handler. |
| 351 | * |
| 352 | * @param event - The event. |
| 353 | * @param handler - The event handler. |
| 354 | */ |
| 355 | readonly registerWorkerEventHandler: ( |
| 356 | event: string, |
| 357 | handler: EventHandler<Worker> |
| 358 | ) => void |
| 359 | /** |
| 360 | * Registers once a worker event handler. |
| 361 | * |
| 362 | * @param event - The event. |
| 363 | * @param handler - The event handler. |
| 364 | */ |
| 365 | readonly registerOnceWorkerEventHandler: ( |
| 366 | event: string, |
| 367 | handler: EventHandler<Worker> |
| 368 | ) => void |
| 369 | /** |
| 370 | * Gets task function worker usage statistics. |
| 371 | * |
| 372 | * @param name - The task function name. |
| 373 | * @returns The task function worker usage statistics if the task function worker usage statistics are initialized, `undefined` otherwise. |
| 374 | */ |
| 375 | readonly getTaskFunctionWorkerUsage: (name: string) => WorkerUsage | undefined |
| 376 | /** |
| 377 | * Deletes task function worker usage statistics. |
| 378 | * |
| 379 | * @param name - The task function name. |
| 380 | * @returns `true` if the task function worker usage statistics were deleted, `false` otherwise. |
| 381 | */ |
| 382 | readonly deleteTaskFunctionWorkerUsage: (name: string) => boolean |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Worker node event detail. |
| 387 | * |
| 388 | * @internal |
| 389 | */ |
| 390 | export interface WorkerNodeEventDetail { |
| 391 | workerId?: number |
| 392 | workerNodeKey?: number |
| 393 | } |