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freeCodeCamp/api-server/server/models/donation.js

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import { Observable } from 'rx';
import debug from 'debug';
import InMemoryCache from '../utils/in-memory-cache';
const log = debug('fcc:boot:donate');
const fiveMinutes = 1000 * 60 * 5;
export default function(Donation) {
let activeDonationUpdateInterval = null;
const activeDonationCountCacheTTL = fiveMinutes;
const activeDonationCountCache = InMemoryCache(0);
const activeDonationsQuery$ = () =>
Donation.find$({
// eslint-disable-next-line no-undefined
where: { endDate: undefined }
}).map(instances => instances.length);
function cleanUp() {
if (activeDonationUpdateInterval) {
clearInterval(activeDonationUpdateInterval);
}
return;
}
process.on('exit', cleanUp);
Donation.on('dataSourceAttached', () => {
Donation.find$ = Observable.fromNodeCallback(Donation.find.bind(Donation));
Donation.findOne$ = Observable.fromNodeCallback(
Donation.findOne.bind(Donation)
);
activeDonationsQuery$().subscribe(count => {
log('activeDonator count: %d', count);
return activeDonationCountCache.update(() => count);
});
activeDonationUpdateInterval = setInterval(
() =>
activeDonationsQuery$().subscribe(count => {
log('activeDonator count: %d', count);
return activeDonationCountCache.update(() => count);
}),
activeDonationCountCacheTTL
);
});
function getCurrentActiveDonationCount$() {
return Observable.of(activeDonationCountCache.get());
}
Donation.getCurrentActiveDonationCount$ = getCurrentActiveDonationCount$;
}