overleaf/services/document-updater/app/js/mongodb.js

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const Metrics = require('@overleaf/metrics')
const Settings = require('@overleaf/settings')
const { MongoClient, ObjectId } = require('mongodb')
const mongoClient = new MongoClient(Settings.mongo.url)
const mongoDb = mongoClient.db()
const db = {
docs: mongoDb.collection('docs'),
docSnapshots: mongoDb.collection('docSnapshots'),
projects: mongoDb.collection('projects'),
}
async function healthCheck() {
const res = await mongoDb.command({ ping: 1 })
if (!res.ok) {
throw new Error('failed mongo ping')
}
}
Metrics.mongodb.monitor(mongoClient)
module.exports = {
db,
ObjectId,
mongoClient,
healthCheck: require('util').callbackify(healthCheck),
}