grpcserver

This demonstrates:

• an implementation of a GRPC server interface generated by the protoc compiler
• the repository pattern

GRPC Server implementation

The contactServer struct defined in the grpcserver.go file implements the ContactServiceServer interface generated by the protoc compiler. An important detail is the embedding of a struct called grpc.UnimplementedContactServiceServer. The Go tooling for protoc includes this detail to ensure forward compatibility when modifying GRPC definitions.

Repository pattern

The GRPC server can store contact data in a json file or a sqlite database. The code uses the Repository interface provided by the contacts package. You can choose the actual repository inmplementation by changing the getrepo function defined at the end of grpcserver.go.