ghost/core/server/services/email-analytics/jobs/fetch-latest/index.js

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const {parentPort} = require('worker_threads');
const StartEmailAnalyticsJobEvent = require('../../events/StartEmailAnalyticsJobEvent');

// recurring job to fetch analytics since the most recently seen event timestamp

// Exit early when cancelled to prevent stalling shutdown. No cleanup needed when cancelling as everything is idempotent and will pick up
// where it left off on next run
function cancel() {
    if (parentPort) {
        parentPort.postMessage('Email analytics fetch-latest job cancelled before completion');
        parentPort.postMessage('cancelled');
    } else {
        setTimeout(() => {
            process.exit(0);
        }, 1000);
    }
}

if (parentPort) {
    parentPort.once('message', (message) => {
        if (message === 'cancel') {
            return cancel();
        }
    });
}

(async () => {
    // We send an evnet message, so that it is emitted on the main thread by the job manager
    // This will start the email analytics job on the main thread (the wrapper service is listening for this event)
    parentPort.postMessage({
        event: {
            type: StartEmailAnalyticsJobEvent.name
        }
    });

    if (parentPort) {
        parentPort.postMessage('done');
    } else {
        // give the logging pipes time finish writing before exit
        setTimeout(() => {
            process.exit(0);
        }, 1000);
    }
})();