78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
import { Observable } from 'rx';
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import debug from 'debug';
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import { reportError } from '../middlewares/sentry-error-handler.js';
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import InMemoryCache from '../utils/in-memory-cache';
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const log = debug('fcc:boot:donate');
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const fiveMinutes = 1000 * 60 * 5;
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export default function(Donation) {
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let activeDonationUpdateInterval = null;
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const activeDonationCountCacheTTL = fiveMinutes;
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const activeDonationCountCache = InMemoryCache(0, reportError);
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const activeDonationsQuery$ = () =>
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Donation.find$({
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// eslint-disable-next-line no-undefined
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where: { endDate: undefined }
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}).map(instances => instances.length);
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function cleanUp() {
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if (activeDonationUpdateInterval) {
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clearInterval(activeDonationUpdateInterval);
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}
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return;
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}
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process.on('exit', cleanUp);
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Donation.on('dataSourceAttached', () => {
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Donation.find$ = Observable.fromNodeCallback(Donation.find.bind(Donation));
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Donation.findOne$ = Observable.fromNodeCallback(
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Donation.findOne.bind(Donation)
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);
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seedTheCache()
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.then(setupCacheUpdateInterval)
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.catch(err => {
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const errMsg = `Error caught seeding the cache: ${err.message}`;
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err.message = errMsg;
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reportError(err);
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});
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});
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function seedTheCache() {
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return new Promise((resolve, reject) =>
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Observable.defer(activeDonationsQuery$).subscribe(count => {
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log('activeDonor count: %d', count);
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activeDonationCountCache.update(() => count);
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return resolve();
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}, reject)
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);
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}
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function setupCacheUpdateInterval() {
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activeDonationUpdateInterval = setInterval(
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() =>
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Observable.defer(activeDonationsQuery$).subscribe(
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count => {
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log('activeDonor count: %d', count);
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return activeDonationCountCache.update(() => count);
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},
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err => {
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const errMsg = `Error caught updating the cache: ${err.message}`;
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err.message = errMsg;
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reportError(err);
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}
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),
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activeDonationCountCacheTTL
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);
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return null;
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}
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function getCurrentActiveDonationCount$() {
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return Observable.of(activeDonationCountCache.get());
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}
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Donation.getCurrentActiveDonationCount$ = getCurrentActiveDonationCount$;
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}
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