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/** | |
* Clusters of Node.js processes can be used to run multiple instances of Node.js | |
* that can distribute workloads among their application threads. When process | |
* isolation is not needed, use the `worker_threads` module instead, which | |
* allows running multiple application threads within a single Node.js instance. | |
* | |
* The cluster module allows easy creation of child processes that all share | |
* server ports. | |
* | |
* ```js | |
* import cluster from 'node:cluster'; | |
* import http from 'node:http'; | |
* import { availableParallelism } from 'node:os'; | |
* import process from 'node:process'; | |
* | |
* const numCPUs = availableParallelism(); | |
* | |
* if (cluster.isPrimary) { | |
* console.log(`Primary ${process.pid} is running`); | |
* | |
* // Fork workers. | |
* for (let i = 0; i < numCPUs; i++) { | |
* cluster.fork(); | |
* } | |
* | |
* cluster.on('exit', (worker, code, signal) => { | |
* console.log(`worker ${worker.process.pid} died`); | |
* }); | |
* } else { | |
* // Workers can share any TCP connection | |
* // In this case it is an HTTP server | |
* http.createServer((req, res) => { | |
* res.writeHead(200); | |
* res.end('hello world\n'); | |
* }).listen(8000); | |
* | |
* console.log(`Worker ${process.pid} started`); | |
* } | |
* ``` | |
* | |
* Running Node.js will now share port 8000 between the workers: | |
* | |
* ```console | |
* $ node server.js | |
* Primary 3596 is running | |
* Worker 4324 started | |
* Worker 4520 started | |
* Worker 6056 started | |
* Worker 5644 started | |
* ``` | |
* | |
* On Windows, it is not yet possible to set up a named pipe server in a worker. | |
* @see [source](https://github.com/nodejs/node/blob/v20.2.0/lib/cluster.js) | |
*/ | |
declare module "cluster" { | |
import * as child from "node:child_process"; | |
import EventEmitter = require("node:events"); | |
import * as net from "node:net"; | |
type SerializationType = "json" | "advanced"; | |
export interface ClusterSettings { | |
execArgv?: string[] | undefined; // default: process.execArgv | |
exec?: string | undefined; | |
args?: string[] | undefined; | |
silent?: boolean | undefined; | |
stdio?: any[] | undefined; | |
uid?: number | undefined; | |
gid?: number | undefined; | |
inspectPort?: number | (() => number) | undefined; | |
serialization?: SerializationType | undefined; | |
cwd?: string | undefined; | |
windowsHide?: boolean | undefined; | |
} | |
export interface Address { | |
address: string; | |
port: number; | |
addressType: number | "udp4" | "udp6"; // 4, 6, -1, "udp4", "udp6" | |
} | |
/** | |
* A `Worker` object contains all public information and method about a worker. | |
* In the primary it can be obtained using `cluster.workers`. In a worker | |
* it can be obtained using `cluster.worker`. | |
* @since v0.7.0 | |
*/ | |
export class Worker extends EventEmitter { | |
/** | |
* Each new worker is given its own unique id, this id is stored in the`id`. | |
* | |
* While a worker is alive, this is the key that indexes it in`cluster.workers`. | |
* @since v0.8.0 | |
*/ | |
id: number; | |
/** | |
* All workers are created using `child_process.fork()`, the returned object | |
* from this function is stored as `.process`. In a worker, the global `process`is stored. | |
* | |
* See: `Child Process module`. | |
* | |
* Workers will call `process.exit(0)` if the `'disconnect'` event occurs | |
* on `process` and `.exitedAfterDisconnect` is not `true`. This protects against | |
* accidental disconnection. | |
* @since v0.7.0 | |
*/ | |
process: child.ChildProcess; | |
/** | |
* Send a message to a worker or primary, optionally with a handle. | |
* | |
* In the primary, this sends a message to a specific worker. It is identical to `ChildProcess.send()`. | |
* | |
* In a worker, this sends a message to the primary. It is identical to`process.send()`. | |
* | |
* This example will echo back all messages from the primary: | |
* | |
* ```js | |
* if (cluster.isPrimary) { | |
* const worker = cluster.fork(); | |
* worker.send('hi there'); | |
* | |
* } else if (cluster.isWorker) { | |
* process.on('message', (msg) => { | |
* process.send(msg); | |
* }); | |
* } | |
* ``` | |
* @since v0.7.0 | |
* @param options The `options` argument, if present, is an object used to parameterize the sending of certain types of handles. `options` supports the following properties: | |
*/ | |
send(message: child.Serializable, callback?: (error: Error | null) => void): boolean; | |
send( | |
message: child.Serializable, | |
sendHandle: child.SendHandle, | |
callback?: (error: Error | null) => void, | |
): boolean; | |
send( | |
message: child.Serializable, | |
sendHandle: child.SendHandle, | |
options?: child.MessageOptions, | |
callback?: (error: Error | null) => void, | |
): boolean; | |
/** | |
* This function will kill the worker. In the primary worker, it does this by | |
* disconnecting the `worker.process`, and once disconnected, killing with`signal`. In the worker, it does it by killing the process with `signal`. | |
* | |
* The `kill()` function kills the worker process without waiting for a graceful | |
* disconnect, it has the same behavior as `worker.process.kill()`. | |
* | |
* This method is aliased as `worker.destroy()` for backwards compatibility. | |
* | |
* In a worker, `process.kill()` exists, but it is not this function; | |
* it is `kill()`. | |
* @since v0.9.12 | |
* @param [signal='SIGTERM'] Name of the kill signal to send to the worker process. | |
*/ | |
kill(signal?: string): void; | |
destroy(signal?: string): void; | |
/** | |
* In a worker, this function will close all servers, wait for the `'close'` event | |
* on those servers, and then disconnect the IPC channel. | |
* | |
* In the primary, an internal message is sent to the worker causing it to call`.disconnect()` on itself. | |
* | |
* Causes `.exitedAfterDisconnect` to be set. | |
* | |
* After a server is closed, it will no longer accept new connections, | |
* but connections may be accepted by any other listening worker. Existing | |
* connections will be allowed to close as usual. When no more connections exist, | |
* see `server.close()`, the IPC channel to the worker will close allowing it | |
* to die gracefully. | |
* | |
* The above applies _only_ to server connections, client connections are not | |
* automatically closed by workers, and disconnect does not wait for them to close | |
* before exiting. | |
* | |
* In a worker, `process.disconnect` exists, but it is not this function; | |
* it is `disconnect()`. | |
* | |
* Because long living server connections may block workers from disconnecting, it | |
* may be useful to send a message, so application specific actions may be taken to | |
* close them. It also may be useful to implement a timeout, killing a worker if | |
* the `'disconnect'` event has not been emitted after some time. | |
* | |
* ```js | |
* if (cluster.isPrimary) { | |
* const worker = cluster.fork(); | |
* let timeout; | |
* | |
* worker.on('listening', (address) => { | |
* worker.send('shutdown'); | |
* worker.disconnect(); | |
* timeout = setTimeout(() => { | |
* worker.kill(); | |
* }, 2000); | |
* }); | |
* | |
* worker.on('disconnect', () => { | |
* clearTimeout(timeout); | |
* }); | |
* | |
* } else if (cluster.isWorker) { | |
* const net = require('node:net'); | |
* const server = net.createServer((socket) => { | |
* // Connections never end | |
* }); | |
* | |
* server.listen(8000); | |
* | |
* process.on('message', (msg) => { | |
* if (msg === 'shutdown') { | |
* // Initiate graceful close of any connections to server | |
* } | |
* }); | |
* } | |
* ``` | |
* @since v0.7.7 | |
* @return A reference to `worker`. | |
*/ | |
disconnect(): void; | |
/** | |
* This function returns `true` if the worker is connected to its primary via its | |
* IPC channel, `false` otherwise. A worker is connected to its primary after it | |
* has been created. It is disconnected after the `'disconnect'` event is emitted. | |
* @since v0.11.14 | |
*/ | |
isConnected(): boolean; | |
/** | |
* This function returns `true` if the worker's process has terminated (either | |
* because of exiting or being signaled). Otherwise, it returns `false`. | |
* | |
* ```js | |
* import cluster from 'node:cluster'; | |
* import http from 'node:http'; | |
* import { availableParallelism } from 'node:os'; | |
* import process from 'node:process'; | |
* | |
* const numCPUs = availableParallelism(); | |
* | |
* if (cluster.isPrimary) { | |
* console.log(`Primary ${process.pid} is running`); | |
* | |
* // Fork workers. | |
* for (let i = 0; i < numCPUs; i++) { | |
* cluster.fork(); | |
* } | |
* | |
* cluster.on('fork', (worker) => { | |
* console.log('worker is dead:', worker.isDead()); | |
* }); | |
* | |
* cluster.on('exit', (worker, code, signal) => { | |
* console.log('worker is dead:', worker.isDead()); | |
* }); | |
* } else { | |
* // Workers can share any TCP connection. In this case, it is an HTTP server. | |
* http.createServer((req, res) => { | |
* res.writeHead(200); | |
* res.end(`Current process\n ${process.pid}`); | |
* process.kill(process.pid); | |
* }).listen(8000); | |
* } | |
* ``` | |
* @since v0.11.14 | |
*/ | |
isDead(): boolean; | |
/** | |
* This property is `true` if the worker exited due to `.disconnect()`. | |
* If the worker exited any other way, it is `false`. If the | |
* worker has not exited, it is `undefined`. | |
* | |
* The boolean `worker.exitedAfterDisconnect` allows distinguishing between | |
* voluntary and accidental exit, the primary may choose not to respawn a worker | |
* based on this value. | |
* | |
* ```js | |
* cluster.on('exit', (worker, code, signal) => { | |
* if (worker.exitedAfterDisconnect === true) { | |
* console.log('Oh, it was just voluntary – no need to worry'); | |
* } | |
* }); | |
* | |
* // kill worker | |
* worker.kill(); | |
* ``` | |
* @since v6.0.0 | |
*/ | |
exitedAfterDisconnect: boolean; | |
/** | |
* events.EventEmitter | |
* 1. disconnect | |
* 2. error | |
* 3. exit | |
* 4. listening | |
* 5. message | |
* 6. online | |
*/ | |
addListener(event: string, listener: (...args: any[]) => void): this; | |
addListener(event: "disconnect", listener: () => void): this; | |
addListener(event: "error", listener: (error: Error) => void): this; | |
addListener(event: "exit", listener: (code: number, signal: string) => void): this; | |
addListener(event: "listening", listener: (address: Address) => void): this; | |
addListener(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
addListener(event: "online", listener: () => void): this; | |
emit(event: string | symbol, ...args: any[]): boolean; | |
emit(event: "disconnect"): boolean; | |
emit(event: "error", error: Error): boolean; | |
emit(event: "exit", code: number, signal: string): boolean; | |
emit(event: "listening", address: Address): boolean; | |
emit(event: "message", message: any, handle: net.Socket | net.Server): boolean; | |
emit(event: "online"): boolean; | |
on(event: string, listener: (...args: any[]) => void): this; | |
on(event: "disconnect", listener: () => void): this; | |
on(event: "error", listener: (error: Error) => void): this; | |
on(event: "exit", listener: (code: number, signal: string) => void): this; | |
on(event: "listening", listener: (address: Address) => void): this; | |
on(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
on(event: "online", listener: () => void): this; | |
once(event: string, listener: (...args: any[]) => void): this; | |
once(event: "disconnect", listener: () => void): this; | |
once(event: "error", listener: (error: Error) => void): this; | |
once(event: "exit", listener: (code: number, signal: string) => void): this; | |
once(event: "listening", listener: (address: Address) => void): this; | |
once(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
once(event: "online", listener: () => void): this; | |
prependListener(event: string, listener: (...args: any[]) => void): this; | |
prependListener(event: "disconnect", listener: () => void): this; | |
prependListener(event: "error", listener: (error: Error) => void): this; | |
prependListener(event: "exit", listener: (code: number, signal: string) => void): this; | |
prependListener(event: "listening", listener: (address: Address) => void): this; | |
prependListener(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
prependListener(event: "online", listener: () => void): this; | |
prependOnceListener(event: string, listener: (...args: any[]) => void): this; | |
prependOnceListener(event: "disconnect", listener: () => void): this; | |
prependOnceListener(event: "error", listener: (error: Error) => void): this; | |
prependOnceListener(event: "exit", listener: (code: number, signal: string) => void): this; | |
prependOnceListener(event: "listening", listener: (address: Address) => void): this; | |
prependOnceListener(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
prependOnceListener(event: "online", listener: () => void): this; | |
} | |
export interface Cluster extends EventEmitter { | |
disconnect(callback?: () => void): void; | |
fork(env?: any): Worker; | |
/** @deprecated since v16.0.0 - use isPrimary. */ | |
readonly isMaster: boolean; | |
readonly isPrimary: boolean; | |
readonly isWorker: boolean; | |
schedulingPolicy: number; | |
readonly settings: ClusterSettings; | |
/** @deprecated since v16.0.0 - use setupPrimary. */ | |
setupMaster(settings?: ClusterSettings): void; | |
/** | |
* `setupPrimary` is used to change the default 'fork' behavior. Once called, the settings will be present in cluster.settings. | |
*/ | |
setupPrimary(settings?: ClusterSettings): void; | |
readonly worker?: Worker | undefined; | |
readonly workers?: NodeJS.Dict<Worker> | undefined; | |
readonly SCHED_NONE: number; | |
readonly SCHED_RR: number; | |
/** | |
* events.EventEmitter | |
* 1. disconnect | |
* 2. exit | |
* 3. fork | |
* 4. listening | |
* 5. message | |
* 6. online | |
* 7. setup | |
*/ | |
addListener(event: string, listener: (...args: any[]) => void): this; | |
addListener(event: "disconnect", listener: (worker: Worker) => void): this; | |
addListener(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this; | |
addListener(event: "fork", listener: (worker: Worker) => void): this; | |
addListener(event: "listening", listener: (worker: Worker, address: Address) => void): this; | |
addListener( | |
event: "message", | |
listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void, | |
): this; // the handle is a net.Socket or net.Server object, or undefined. | |
addListener(event: "online", listener: (worker: Worker) => void): this; | |
addListener(event: "setup", listener: (settings: ClusterSettings) => void): this; | |
emit(event: string | symbol, ...args: any[]): boolean; | |
emit(event: "disconnect", worker: Worker): boolean; | |
emit(event: "exit", worker: Worker, code: number, signal: string): boolean; | |
emit(event: "fork", worker: Worker): boolean; | |
emit(event: "listening", worker: Worker, address: Address): boolean; | |
emit(event: "message", worker: Worker, message: any, handle: net.Socket | net.Server): boolean; | |
emit(event: "online", worker: Worker): boolean; | |
emit(event: "setup", settings: ClusterSettings): boolean; | |
on(event: string, listener: (...args: any[]) => void): this; | |
on(event: "disconnect", listener: (worker: Worker) => void): this; | |
on(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this; | |
on(event: "fork", listener: (worker: Worker) => void): this; | |
on(event: "listening", listener: (worker: Worker, address: Address) => void): this; | |
on(event: "message", listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
on(event: "online", listener: (worker: Worker) => void): this; | |
on(event: "setup", listener: (settings: ClusterSettings) => void): this; | |
once(event: string, listener: (...args: any[]) => void): this; | |
once(event: "disconnect", listener: (worker: Worker) => void): this; | |
once(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this; | |
once(event: "fork", listener: (worker: Worker) => void): this; | |
once(event: "listening", listener: (worker: Worker, address: Address) => void): this; | |
once(event: "message", listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. | |
once(event: "online", listener: (worker: Worker) => void): this; | |
once(event: "setup", listener: (settings: ClusterSettings) => void): this; | |
prependListener(event: string, listener: (...args: any[]) => void): this; | |
prependListener(event: "disconnect", listener: (worker: Worker) => void): this; | |
prependListener(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this; | |
prependListener(event: "fork", listener: (worker: Worker) => void): this; | |
prependListener(event: "listening", listener: (worker: Worker, address: Address) => void): this; | |
// the handle is a net.Socket or net.Server object, or undefined. | |
prependListener( | |
event: "message", | |
listener: (worker: Worker, message: any, handle?: net.Socket | net.Server) => void, | |
): this; | |
prependListener(event: "online", listener: (worker: Worker) => void): this; | |
prependListener(event: "setup", listener: (settings: ClusterSettings) => void): this; | |
prependOnceListener(event: string, listener: (...args: any[]) => void): this; | |
prependOnceListener(event: "disconnect", listener: (worker: Worker) => void): this; | |
prependOnceListener(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this; | |
prependOnceListener(event: "fork", listener: (worker: Worker) => void): this; | |
prependOnceListener(event: "listening", listener: (worker: Worker, address: Address) => void): this; | |
// the handle is a net.Socket or net.Server object, or undefined. | |
prependOnceListener( | |
event: "message", | |
listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void, | |
): this; | |
prependOnceListener(event: "online", listener: (worker: Worker) => void): this; | |
prependOnceListener(event: "setup", listener: (settings: ClusterSettings) => void): this; | |
} | |
const cluster: Cluster; | |
export default cluster; | |
} | |
declare module "node:cluster" { | |
export * from "cluster"; | |
export { default as default } from "cluster"; | |
} | |