fix: possible race condition

Author: sinedied

packages/agent-api/src/user-db-service.ts

@@ -13,8 +13,9 @@ export class UserDbService {
 
   static async getInstance(): Promise<UserDbService> {
     if (!UserDbService.instance) {
-      UserDbService.instance = new UserDbService();
-      await UserDbService.instance.initializeCosmosDb();
+      const instance = new UserDbService();
+      await instance.initializeCosmosDb();
+      UserDbService.instance = instance;
     }
     return UserDbService.instance;
   }

packages/burger-api/src/blob-service.ts

@@ -13,8 +13,9 @@ export class BlobService {
 
   public static async getInstance(): Promise<BlobService> {
     if (!BlobService.instance) {
-      BlobService.instance = new BlobService();
-      await BlobService.instance.initialize();
+      const instance = new BlobService();
+      await instance.initialize();
+      BlobService.instance = instance;
     }
 
     return BlobService.instance;

packages/burger-api/src/db-service.ts

@@ -55,9 +55,10 @@ export class DbService {
 
   static async getInstance(): Promise<DbService> {
     if (!DbService.instance) {
-      DbService.instance = new DbService();
-      await DbService.instance.initializeCosmosDb();
-      DbService.instance.initializeLocalData();
+      const instance = new DbService();
+      await instance.initializeCosmosDb();
+      instance.initializeLocalData();
+      DbService.instance = instance;
     }
 
     return DbService.instance;