/
types.ts
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/
types.ts
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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 * as EventEmitter from 'events';
import {ForkOptions} from 'child_process';
// Because of the dynamic nature of a worker communication process, all messages
// coming from any of the other processes cannot be typed. Thus, many types
// include "unknown" as a TS type, which is (unfortunately) correct here.
export const CHILD_MESSAGE_INITIALIZE: 0 = 0;
export const CHILD_MESSAGE_CALL: 1 = 1;
export const CHILD_MESSAGE_END: 2 = 2;
export const PARENT_MESSAGE_OK: 0 = 0;
export const PARENT_MESSAGE_CLIENT_ERROR: 1 = 1;
export const PARENT_MESSAGE_SETUP_ERROR: 2 = 2;
export type PARENT_MESSAGE_ERROR =
| typeof PARENT_MESSAGE_CLIENT_ERROR
| typeof PARENT_MESSAGE_SETUP_ERROR;
// Option objects.
export {ForkOptions};
export interface WorkerPoolInterface {
getStderr(): NodeJS.ReadableStream;
getStdout(): NodeJS.ReadableStream;
getWorkers(): Array<WorkerInterface>;
createWorker(options: WorkerOptions): WorkerInterface;
send(
workerId: number,
request: ChildMessage,
onStart: OnStart,
onEnd: OnEnd,
): void;
end(): void;
}
export interface WorkerInterface {
send(
request: ChildMessage,
onProcessStart: OnStart,
onProcessEnd: OnEnd,
): void;
getWorkerId(): number;
getStderr(): NodeJS.ReadableStream;
getStdout(): NodeJS.ReadableStream;
onExit(exitCode: number): void;
onMessage(message: ParentMessage): void;
}
export type FarmOptions = {
computeWorkerKey?: (method: string, ...args: Array<unknown>) => string | null;
exposedMethods?: ReadonlyArray<string>;
forkOptions?: ForkOptions;
setupArgs?: Array<unknown>;
maxRetries?: number;
numWorkers?: number;
WorkerPool?: (
workerPath: string,
options?: WorkerPoolOptions,
) => WorkerPoolInterface;
enableWorkerThreads?: boolean;
};
export type WorkerPoolOptions = {
setupArgs: Array<unknown>;
forkOptions: ForkOptions;
maxRetries: number;
numWorkers: number;
enableWorkerThreads: boolean;
};
export type WorkerOptions = {
forkOptions: ForkOptions;
setupArgs: Array<unknown>;
maxRetries: number;
workerId: number;
workerPath: string;
};
// Messages passed from the parent to the children.
export type MessagePort = typeof EventEmitter & {
postMessage(message: unknown): void;
};
export type MessageChannel = {
port1: MessagePort;
port2: MessagePort;
};
export type ChildMessageInitialize = [
typeof CHILD_MESSAGE_INITIALIZE, // type
boolean, // processed
string, // file
Array<unknown> | undefined, // setupArgs
MessagePort | undefined // MessagePort
];
export type ChildMessageCall = [
typeof CHILD_MESSAGE_CALL, // type
boolean, // processed
string, // method
Array<unknown> // args
];
export type ChildMessageEnd = [
typeof CHILD_MESSAGE_END, // type
boolean // processed
];
export type ChildMessage =
| ChildMessageInitialize
| ChildMessageCall
| ChildMessageEnd;
// Messages passed from the children to the parent.
export type ParentMessageOk = [
typeof PARENT_MESSAGE_OK, // type
unknown // result
];
export type ParentMessageError = [
PARENT_MESSAGE_ERROR, // type
string, // constructor
string, // message
string, // stack
unknown // extra
];
export type ParentMessage = ParentMessageOk | ParentMessageError;
// Queue types.
export type OnStart = (worker: WorkerInterface) => void;
export type OnEnd = (err: Error | null, result: unknown) => void;
export type QueueChildMessage = {
request: ChildMessage;
onStart: OnStart;
onEnd: OnEnd;
};
export type QueueItem = {
task: QueueChildMessage;
next: QueueItem | null;
};