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const { Types } = require('mongoose');
const { Service } = require('feathers-mongoose');
const _ = require('lodash');
const cron = require('cron');
const Bluebird = require('bluebird');
const Model = require('./event.model.js');
const handleAttendClassJob = require('../../handlers');
const CronJob = cron.CronJob;
const handleTestJob = () => new Promise(res => setTimeout(res, 10000));
class Events extends Service {
async setup(app, path) {
this.jobs = [];
await this.rescheduleMissedEvents();
const job = new CronJob('*/10 * * * * *', () => this.updateJobs());
job.start();
}
startAllJobs() {
this.jobs.forEach(job => job.start());
}
stopAllJobs() {
this.jobs.forEach(job => job.stop());
}
async rescheduleMissedEvents() {
const missedEvents = await this.Model.findMissedEvents();
return Bluebird.map(missedEvents, event => event.save());
}
async updateJobs() {
// Reschedule missed events before we stop jobs to avoid
// accidentally stopping the job that has not triggered yet
// (if event schedule resonates with updateJobs schedule)
await this.rescheduleMissedEvents();
this.stopAllJobs();
const events = await this.Model.findNextEvents();
if (!events.length) console.log('WARNING: no upcoming events');
this.jobs = events.map(event => new CronJob(
event.schedule,
() => this.run(event._id)
));
this.startAllJobs();
}
async run(id) {
const event = await this.Model.findById(id);
try {
event.start();
await handleAttendClassJob(event);
return event.complete();
} catch (error) {
event.fail(error);
}
}
}
module.exports = app => {
app.use('/events', new Events({ Model }));
};
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