Workers

Files under app/workers are autoloaded, watched and reloaded. If a worker exports start() and stop(), they are called when the application boots, reloads and shuts down.

app/workers/heartbeat.js

let timer;

const start = (henri) => {
  henri.pen.info('heartbeat', 'worker started');
  timer = setInterval(() => henri.pen.warn('heartbeat', 'still alive'), 5000);
};

const stop = () => clearInterval(timer);

module.exports = { start, stop };

Both hooks receive the henri instance. henri server --skip-workers (or SKIP_WORKERS=1) boots without them, which is handy when a worker talks to an external service you do not want to hit while developing.