added getMongoDbContext.js

backend/getMongoDbContext.js

@@ -0,0 +1,58 @@
+const isDevEnvironment = process.env.environment === 'dev' || false
+const { MongoClient, ObjectId } = require('mongodb')
+
+const _ContextChache_ = {}
+
+function getMongoDbContext(){
+	return new Promise(async (resolve,reject)=>{
+		if (_ContextChache_.mongodb) {
+			resolve(_ContextChache_.mongodb)
+		}else{
+			const mongodb_uri = encodeURI(isDevEnvironment ? process.env.mongodb_uri_dev : process.env.mongodb_uri_prod) // test?retryWrites=true&w=majority
+
+			if (!mongodb_uri) {
+				reject('probably no mongodb rights')
+			}else{
+				MongoClient.connect(mongodb_uri, {
+					useNewUrlParser: true,
+					useUnifiedTopology: true,
+				}).then(mongodb_client => {
+					const names = {
+						dbs: {
+							diversity: 'diversity',
+						},
+						collections: {
+							users: 'users',
+							answers: 'answers',
+						}
+					}
+
+					const dbs = {
+						diversity: mongodb_client.db(names.dbs.diversity),
+					}
+					const collections = {
+						users: dbs.diversity.collection(names.collections.users),
+						answers: dbs.diversity.collection(names.collections.answers),
+					}
+
+					_ContextChache_.mongodb = {
+						client: mongodb_client,
+						ObjectId,
+						ObjectID: ObjectId,
+
+						names,
+						dbs,
+						collections,
+					}
+
+					resolve(_ContextChache_.mongodb)
+				}).catch(error=>{
+					console.error(error)
+					reject('could not connect to mongodb')
+				})
+			}
+		}
+	})
+}
+
+module.exports = getMongoDbContext

backend/index.js

@@ -1,5 +1,7 @@
 require('dotenv').config()
 
+// const getMongoDbContext = require('./getMongoDbContext.js')
+
 // const isDevEnvironment = process.env.environment === 'dev' || false
 const path = require('path')
 const url = require('url')