• Three servers are implemented in the project: http, gRPC and WebSocket;
• For data storage in-memory-cache was used (data type uuid (user id) was chosen as the key, and int was chosen to store the amount of money for optimal storage (data type float can be implemented for input and multiplied by 100));
• To limit the storage of data in the cache, the time must be set ttl;
• The project is logged (writes to the console by default);
• The project is dockerized and a multistage docker file is used;

Docker-compose is required to run the project.

docker-compose up --build --remove-orphans or make run

Proto files are located in the proto directory (make proto)

• REST Endpoint = http://localhost:8080/
• gRPC Endpoints = 0.0.0.0:9090 (In Postman, use gRPC format requests with Proto file loading)
• WebSocket = http://localhost:8081/