Unique indexes (#1971)

* Add unique indexing

* Add unique indexing for username/email

* WIP

* Finish unique indexes

* Notes on how to upgrade to 2.3.0 safely

* index on unique-indexes: c454180 Revert "Log objects rather than JSON stringified objects (#1922)"

* reconfigure username/email tests

* Start dealing with test shittyness

* Remove tests for files that we are removing

* most tests passing

* fix failing test

* Make specific server config for tests async

* Fix more tests

* fix more tests

* Fix another test

* fix more tests

* Fix email validation

* move some stuff around

* Destroy server to ensure all connections are gone

* Fix broken cloud code

* Save callback to variable

* no need to delete non existant cloud

* undo

* Fix all tests where connections are left open after server closes.

* Fix issues caused by missing gridstore adapter

* Update guide for 2.3.0 and fix final tests

* use strict

* don't use features that won't work in node 4

* Fix syntax error

* Fix typos

* Add duplicate finding command

* Update 2.3.0.md

src/Config.js

@@ -16,7 +16,6 @@ function removeTrailingSlash(str) {
 
 export class Config {
   constructor(applicationId: string, mount: string) {
-    let DatabaseAdapter = require('./DatabaseAdapter');
     let cacheInfo = AppCache.get(applicationId);
     if (!cacheInfo) {
       return;
@@ -32,7 +31,7 @@ export class Config {
     this.fileKey = cacheInfo.fileKey;
     this.facebookAppIds = cacheInfo.facebookAppIds;
     this.allowClientClassCreation = cacheInfo.allowClientClassCreation;
-    this.database = DatabaseAdapter.getDatabaseConnection(applicationId, cacheInfo.collectionPrefix);
+    this.database = cacheInfo.databaseController;
 
     this.serverURL = cacheInfo.serverURL;
     this.publicServerURL = removeTrailingSlash(cacheInfo.publicServerURL);
@@ -55,24 +54,31 @@ export class Config {
     this.revokeSessionOnPasswordReset = cacheInfo.revokeSessionOnPasswordReset;
   }
 
-  static validate(options) {
+  static validate({
+    verifyUserEmails,
+    appName,
+    publicServerURL,
+    revokeSessionOnPasswordReset,
+    expireInactiveSessions,
+    sessionLength,
+  }) {
     this.validateEmailConfiguration({
-      verifyUserEmails: options.verifyUserEmails,
-      appName: options.appName,
-      publicServerURL: options.publicServerURL
+      verifyUserEmails: verifyUserEmails,
+      appName: appName,
+      publicServerURL: publicServerURL
     })
 
-    if (typeof options.revokeSessionOnPasswordReset !== 'boolean') {
+    if (typeof revokeSessionOnPasswordReset !== 'boolean') {
       throw 'revokeSessionOnPasswordReset must be a boolean value';
     }
 
-    if (options.publicServerURL) {
-      if (!options.publicServerURL.startsWith("http://") && !options.publicServerURL.startsWith("https://")) {
+    if (publicServerURL) {
+      if (!publicServerURL.startsWith("http://") && !publicServerURL.startsWith("https://")) {
         throw "publicServerURL should be a valid HTTPS URL starting with https://"
       }
     }
 
-    this.validateSessionConfiguration(options.sessionLength, options.expireInactiveSessions);
+    this.validateSessionConfiguration(sessionLength, expireInactiveSessions);
   }
 
   static validateEmailConfiguration({verifyUserEmails, appName, publicServerURL}) {