overleaf/services/track-changes/app/js/mongodb.js

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const Settings = require('@overleaf/settings')
const { MongoClient, ObjectId } = require('mongodb')
const clientPromise = MongoClient.connect(
Settings.mongo.url,
Settings.mongo.options
)
let setupDbPromise
async function waitForDb() {
if (!setupDbPromise) {
setupDbPromise = setupDb()
}
await setupDbPromise
}
const db = {}
async function setupDb() {
const internalDb = (await clientPromise).db()
db.docHistory = internalDb.collection('docHistory')
db.docHistoryIndex = internalDb.collection('docHistoryIndex')
db.projectHistoryMetaData = internalDb.collection('projectHistoryMetaData')
}
async function closeDb() {
let client
try {
client = await clientPromise
} catch (e) {
// there is nothing to close
return
}
return client.close()
}
module.exports = {
db,
ObjectId,
closeDb,
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waitForDb,
}