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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
///
import type { ForkOptions } from 'child_process';
import type { EventEmitter } from 'events';
export interface ResourceLimits {
maxYoungGenerationSizeMb?: number;
maxOldGenerationSizeMb?: number;
codeRangeSizeMb?: number;
}
export declare const CHILD_MESSAGE_INITIALIZE: 0;
export declare const CHILD_MESSAGE_CALL: 1;
export declare const CHILD_MESSAGE_END: 2;
export declare const PARENT_MESSAGE_OK: 0;
export declare const PARENT_MESSAGE_CLIENT_ERROR: 1;
export declare const PARENT_MESSAGE_SETUP_ERROR: 2;
export declare const PARENT_MESSAGE_CUSTOM: 3;
export declare type PARENT_MESSAGE_ERROR = typeof PARENT_MESSAGE_CLIENT_ERROR | typeof PARENT_MESSAGE_SETUP_ERROR;
export interface WorkerPoolInterface {
getStderr(): NodeJS.ReadableStream;
getStdout(): NodeJS.ReadableStream;
getWorkers(): Array;
createWorker(options: WorkerOptions): WorkerInterface;
send(workerId: number, request: ChildMessage, onStart: OnStart, onEnd: OnEnd, onCustomMessage: OnCustomMessage): void;
end(): Promise;
}
export interface WorkerInterface {
send(request: ChildMessage, onProcessStart: OnStart, onProcessEnd: OnEnd, onCustomMessage: OnCustomMessage): void;
waitForExit(): Promise;
forceExit(): void;
getWorkerId(): number;
getStderr(): NodeJS.ReadableStream | null;
getStdout(): NodeJS.ReadableStream | null;
}
export declare type PoolExitResult = {
forceExited: boolean;
};
export interface PromiseWithCustomMessage extends Promise {
UNSTABLE_onCustomMessage?: (listener: OnCustomMessage) => () => void;
}
export type { ForkOptions };
export interface TaskQueue {
/**
* Enqueues the task in the queue for the specified worker or adds it to the
* queue shared by all workers
* @param task the task to queue
* @param workerId the id of the worker that should process this task or undefined
* if there's no preference.
*/
enqueue(task: QueueChildMessage, workerId?: number): void;
/**
* Dequeues the next item from the queue for the speified worker
* @param workerId the id of the worker for which the next task should be retrieved
*/
dequeue(workerId: number): QueueChildMessage | null;
}
export declare type FarmOptions = {
computeWorkerKey?: (method: string, ...args: Array) => string | null;
exposedMethods?: ReadonlyArray;
forkOptions?: ForkOptions;
workerSchedulingPolicy?: 'round-robin' | 'in-order';
resourceLimits?: ResourceLimits;
setupArgs?: Array;
maxRetries?: number;
numWorkers?: number;
taskQueue?: TaskQueue;
WorkerPool?: (workerPath: string, options?: WorkerPoolOptions) => WorkerPoolInterface;
enableWorkerThreads?: boolean;
};
export declare type WorkerPoolOptions = {
setupArgs: Array;
forkOptions: ForkOptions;
resourceLimits: ResourceLimits;
maxRetries: number;
numWorkers: number;
enableWorkerThreads: boolean;
};
export declare type WorkerOptions = {
forkOptions: ForkOptions;
resourceLimits: ResourceLimits;
setupArgs: Array;
maxRetries: number;
workerId: number;
workerPath: string;
};
export declare type MessagePort = typeof EventEmitter & {
postMessage(message: unknown): void;
};
export declare type MessageChannel = {
port1: MessagePort;
port2: MessagePort;
};
export declare type ChildMessageInitialize = [
typeof CHILD_MESSAGE_INITIALIZE,
boolean,
string,
// file
Array | undefined,
// setupArgs
MessagePort | undefined
];
export declare type ChildMessageCall = [
typeof CHILD_MESSAGE_CALL,
boolean,
string,
Array
];
export declare type ChildMessageEnd = [
typeof CHILD_MESSAGE_END,
boolean
];
export declare type ChildMessage = ChildMessageInitialize | ChildMessageCall | ChildMessageEnd;
export declare type ParentMessageCustom = [
typeof PARENT_MESSAGE_CUSTOM,
unknown
];
export declare type ParentMessageOk = [
typeof PARENT_MESSAGE_OK,
unknown
];
export declare type ParentMessageError = [
PARENT_MESSAGE_ERROR,
string,
string,
string,
unknown
];
export declare type ParentMessage = ParentMessageOk | ParentMessageError | ParentMessageCustom;
export declare type OnStart = (worker: WorkerInterface) => void;
export declare type OnEnd = (err: Error | null, result: unknown) => void;
export declare type OnCustomMessage = (message: Array | unknown) => void;
export declare type QueueChildMessage = {
request: ChildMessageCall;
onStart: OnStart;
onEnd: OnEnd;
onCustomMessage: OnCustomMessage;
};