SubProcess Robot

Create subprocesses and deal with messaging. Good for delegating tasks to a differnet process

Import a function and run it using a child process

Before:

import { slowSynchronousTask } from "./synchronous-tasks";

export function synchronousTask(options) {
  return slowSynchronousTask(options);
}

After:

import { spawnProcess } from "subprocess-robot";

export async function asynchronousTask(options) {
  const { slowSynchronousTask } = await spawnProcess.import(
    require.resolve("./synchronous-tasks")
  );

  return await slowSynchronousTask(options);
}

Load balance your task between a pool of processes

Before:

import { slowSynchronousTask } from "./synchronous-tasks";

export function synchronousTask(options) {
  return slowSynchronousTask(options);
}

After:

import { spawnProcessPool } from "subprocess-robot";

export async function asynchronousTask(options) {
  const { slowSynchronousTask } = await spawnProcessPool.import(
    require.resolve("./synchronous-tasks")
  );

  return await slowSynchronousTask(options);
}

Manually create a subprocess and send messages between

Parent process:

import { spawnProcess } from 'subprocess-robot';

const childProcess = spawnProcess({
    script: require.resolve('./child')
});

childProcess.on('getUser', ({ id ) => {
    return {
        id,
        name: 'Daniel',
        logout() {
            // log the user out
        }
    }
});

Child process:

import { attachProcess } from "subprocess-robot";

const parentProcess = attachProcess();

let user = await parentProcess.send("getUser", { id: 1337 });

console.log(`Logging ${user.name} out`);
await user.logout();

Create a pool of processes and delegate tasks

Parent process:

import { spawnProcessPool } from "subprocess-robot";

const childProcessPool = spawnProcessPool({
  script: require.resolve("./child"),
});

let result = childProcessPool.send("do_some_blocking_task", data);

Child process:

import { attachProcess } from "subprocess-robot";

const parentProcess = attachProcess();

parentProcess.on("do_some_blocking_task", (data) => {
  return slowSynchronousCompile(data);
});

Manually create a pool of processes and import a function

Parent process:

import { spawnProcessPool } from "subprocess-robot";

const childProcessPool = spawnProcessPool();

let { doSomeBlockingTask } = await childProcessPool.import(
  require.resolve("./blockingTask")
);

let result = await doSomeBlockingTask(config);

Child process:

export function doSomeBlockingTask(config) {
  return slowSynchronousCompile(config);
}

Quick Start

npm install --save subprocess-robot

Tests

• Run the tests:

  npm test