LotteryGame

Practical assignment from Bede Gaming for the role of .NET Developer

A lottery game implemented as microservices with a SAGA orchestrator, where a human player and CPU players buy tickets, and winners are drawn randomly across three prize tiers: grand prize (50% of revenue), second tier (30% shared among 10% of tickets), and third tier (10% shared among 20% of tickets)

Technologies

• Microservice Architecture
• SAGA orchestration pattern
• ASP.NET Core Web API
• gRPC for service-to-service calls
• Snowflake algorithm for unique ticket numbers
• SQL Server
• Entity Framework Core
• MongoDB
• CouchDB
• Redis
• Docker Compose
• Automapper
• NUnit

Docker Images:

https://hub.docker.com/r/itplamen/operativeservice/tags
https://hub.docker.com/r/itplamen/userdataservice/tags
https://hub.docker.com/r/itplamen/drawservice-workers
https://hub.docker.com/r/itplamen/drawservice
https://hub.docker.com/r/itplamen/wagerservice
https://hub.docker.com/r/itplamen/walletservice

docker-compose build --no-cache

# Check status
[+] Building 284.0s (105/105) FINISHED
[+] Building 6/6
 ✔ lotterygame-orchestrator.api     Built                                                                          0.0s
 ✔ lotterygame-consoleapp           Built                                                                          0.0s
...
...

docker-compose up -d sqlserver mongo couchdb walletservice.api wagerservice.api drawservice.api drawservice.workers redis orchestrator.api

# Check status
 ✔ Network lotterygame_backend          Created                                                                    0.1s
 ✔ Volume "lotterygame_mongo_data"      Created                                                                    0.0s
...
...

docker logs -f walletservice

# Check for applied migrations
Applying migrations...
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (683ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
      CREATE DATABASE [WalletServiceDb];
...
...
Migrations successfully applied!

# Check logs
docker logs -f wagerservice
docker logs -f drawservice
docker logs -f drawservice.workers
docker logs -f orchestrator
...
...

docker-compose run --rm consoleapp

Databases

CouchDB: http://localhost:5984/_utils/#login admin/admin

MongoDB (Compass): mongodb://127.0.0.1:27017/

Redis