Minimal Go GRPC Gateway Example

This project combines the following technologies in the simplest example possible:

1. GoLang 1.21 with Go Modules
2. GRPC Hello World example
3. GRPC Gateway annotations added to the Hello World proto
4. Make targets to simplify generating, building, and running the project

How to run the code

1. go build greeter_grpc_client/main.go Build the GRPC client
2. go build greeter_grpc_server/main.go Build the GRPC server
3. go build greeter_http_client/main.go Build the HTTP client
4. go build greeter_http_server/main.go Build the HTTP server
5. Run both servers: make -j 2 server
6. Run both clients: make -j 2 client
7. You can also hit the HTTP server via REST after starting it up:
   1. GET: http://localhost:8081/v1/sayhello/Sean
   2. GET: http://localhost:8081/v1/saygoodbye/Sean

How to make changes:

1. Modify the helloworld/helloworld.proto Greeter service with your new RPCs
2. Make sure to annotate the rpc(s) correctly for GRPC Gateway support
3. Run make protoc to generate the code for the GRPC and HTTP servers
4. Update greeter_grpc_server/main.go with func (s *server)... to fulfill the updated Greeter service interface generated by protobuf compiler
5. Update greeter_grpc_client/main.go to call your new endpoint via GRPC
6. Update greeter_http_client/main.go to call your new endpoint via HTTP
7. Run both servers: make -j 2 grpc-server http-server
8. Run both clients: make -j 2 grpc-client http-client

Resources:

1. https://grpc.io/docs/languages/go/basics/
2. https://kylewbanks.com/blog/running-multiple-make-targets-concurrently
3. https://github.com/grpc-ecosystem/grpc-gateway
4. https://github.com/grpc/grpc-go
5. https://github.com/grpc/grpc-go/tree/master/examples/helloworld

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