From c337cf1c4fcaa8191340cf3e8a953caf9355f0a8 Mon Sep 17 00:00:00 2001
From: Jakob Ackermann <jakob.ackermann@overleaf.com>
Date: Mon, 7 Sep 2020 09:49:06 +0100
Subject: [PATCH] [misc] mongodb: refactor the process of setting up the db
 construct

Co-Authored-By: John Lees-Miller <jdleesmiller@gmail.com>
---
 services/document-updater/app/js/mongodb.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/services/document-updater/app/js/mongodb.js b/services/document-updater/app/js/mongodb.js
index c06865fff5..8994f891da 100644
--- a/services/document-updater/app/js/mongodb.js
+++ b/services/document-updater/app/js/mongodb.js
@@ -11,16 +11,20 @@ async function healthCheck() {
   }
 }
 
+let setupDbPromise
 async function waitForDb() {
-  await clientPromise
+  if (!setupDbPromise) {
+    setupDbPromise = setupDb()
+  }
+  await setupDbPromise
 }
 
 const db = {}
-waitForDb().then(async function () {
+async function setupDb() {
   const internalDb = (await clientPromise).db()
 
   db.docSnapshots = internalDb.collection('docSnapshots')
-})
+}
 
 module.exports = {
   db,