Implement basic gRPC server for Yoda

[peddybeats]

• Do the Java gRPC tutorial - you may need to read some other stuff on grpc.io to understand protobuf syntax and the point of certain things in gRPC land.
• Create a shake endpoint for Yoda
  • You'll need to create a yoda.proto in jukebox/protos
  • Add build rule 'build-yoda' to Makefile
  • Amend yoda to the list of directories protos is copied to (Makefile:25)
  • Add java grpc build command(s) to Yoda's Dockerfile
  • Consider using Server.java for your server implementation class' name
  • Write a little client Class whose main just sends a RPC call to the Shake endpoint and print it to sdtout
• Expose the correct port (let's use 37000) on the Docker container
• The way I'm envisioning the build process:
  • "User says 'make build' or 'make build-yoda' which copies the protos from /protos to yoda/protos"
  • Then they say docker build (or use a built image) and docker run. The image should have the protos compiled in the src code - which requires you to, in the Dockerfile, as part of container build, build the protos (look at genius Dockerfile line 15 for ex)

[peddybeats]

One challenge that I foresee:

• when we run our images, we map the src directory from the host FS to the container's (for better dev experience)
• however, I want to compile protos inside the container (as part of the image build process)
  • this means that protos get created in ..yoda/src/protos at build time, but then at run time, we map the host FS' sec directory which doesn't have a compiled src/protos directory
• my proposed solution:
  • short term: let's just not map our sec directory at runtime. This will make the development experience subpar
  • you can either completely do all development an building and running inside container
  • or you can just build the docker image before running it each time (and develop on your local machine normally)
  • long-term: I'm gonna try to figure out what the right solution to this is. I'm sure it's a problem faced by others. Maybe we build the protos at runtime? But that feels wrong to me. Hopefully we can exclude a single directory (protos) from being mapped over?

[peddybeats]

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