dcp-client/examples/nodejs/simple-job.js

Core libraries for accessing DCP network

#! /usr/bin/env node
/**
 * @file    simple-job.js 
 *          
 *          Sample NodeJS application showing how to deploy a simple DCP job.
 *
 *          *********************************** NOTE ***********************************
 *          Your keystore should be placed in your home directory in .dcp/default.keystore.
 *          When using the dcp-client API in NodeJS, this keystore will be used for communicating over DCP.
* 
 * @author  Wes Garland <wes@distributive.network>
 * @author  Kevin Yu    <kevin@distributive.network>
 * @date    Aug 2019, April 2020, June 2024
 */

'use strict';

/**
 * Setup event listeners for jobs
 *
 * @param {object} job - the job handle object
 * @returns {void} 
 */
function addJobEventListeners(job)
{
  // Log the job's assigned id.
  job.on('accepted', ({ id }) => console.log(`Job accepted with id ${id}`));

  // Log returned slice results
  job.on('result', (result) => console.log('Received result:', result));
}

/**
 * Main function to deploy a job
 *
 * @returns {void} 
 */
async function main()
{
  const compute = require('dcp/compute');
  console.log(dcpConfig.scheduler.location.href);
  console.log(dcpConfig.scheduler.services.resultSubmitter.location.href);
  console.log(dcpConfig.scheduler.services.eventRouter.location.href);

  // Creates a Job for the distributed computer. 
  // https://docs.dcp.dev/specs/compute-api.html#compute-for
  const job = compute.for(
    [1,2,3,4],
    (datum) => {
      // If a progress event is not emitted within 30 seconds, 
      // the scheduler will throw an ENOPROGRESS error.
      progress(1);
      return datum * 2;
    },
  );

  // Listen for job emitted events
  addJobEventListeners(job);
  
  // Deploys the job 
  const results = await job.exec(compute.marketRate);
  console.log('Job completed, here are the results: ', Array.from(results));
}

require('../../').init().then(main);