Requirements

1. Design a data structure for storing customer ledgers, balance details etc.
2. By making use of the created data structure, create a gRPC service to support below features
   • Create user wallet – assuming user profile is created already in other systems and a unique user id (uuid) is created
   • Record keeping for user's transaction (credit to or debit from user's wallet) in ledgers
   • Retrieve user wallet summary
   • Get user transaction history (pagination required)
3. The service should also support
   • Multiple currency (e.g ETC, BTC, USD etc.)
   • Multiple users
4. The service should have proper unit testing coverage
5. Proper logging in the service
6. Documentation
7. Anything you think it can make the service better

• Please try not to over complicate the task.
• You can use any third-party framework or libraries

Building protogen

 protoc -I=./proto --go_out=. ./proto/contract.proto --go-grpc_out=.

Generating Persist mock data

Using mockery to generate mock data, how to install here

mockery --name Persist --dir "./service" 

Running tests with coverage

$ go test ./... --coverprofile=coverage.out
$ go tool cover -html=coverage.out

Storage

The storage used is a JSON file based system. Library used is here.