Application

Simple gRPC server that creates a todo list which a client application consumes. Tutorial from https://www.youtube.com/watch?v=Yw4rkaTc0f8

Protocol Buffer

todo.proto is used in both client.js and server.js to generate a Interface Definition Language. This is to say it generates 'stubs' on the client (e.g. client.readTodos(...)) and lets the server know about these endpoints.

Here both the client and server use @grpc/grpc-js and @grpc/proto-loader to serialize/deserialize using Protocol Buffers into binary which are then sent across the wire. (Effectively performing the same function as the output of protoc)

Run the application

In a separate terminal run:

npm run server

In a separate terminal run:

npm run client -- itemOne
npm run client -- itemTwo
npm run client -- itemThree

Note that running the client will call all the methods.

Sample output:

received item from server: {"id":1,"text":"itemOne"}
received item from server: {"id":2,"text":"itemTwo"}
received item from server: {"id":3,"text":"itemThree"}
Response from gRPC server upon `createTodo` method: {"id":3,"text":"itemThree"}
Response from gRPC server upon `readTodos` method: {"items":[{"id":1,"text":"itemOne"},{"id":2,"text":"itemTwo"},{"id":3,"text":"itemThree"}]}
server done!