This is a simple gRPC server built with Node.js. It demonstrates unary, client streaming, and server streaming service methods. It makes use of the Open Notify API to retrieve real-time information about the International Space Station.

~/$ git clone [email protected]:alvinslee/grpc-iss-demo.git
~/$ cd grpc-iss-demo
~/grpc-iss-demo$ yarn install
~/grpc-iss-demo$ node server.js

This project assumes the use of a gRPC client like Insomnia. Load the space_station.proto file, which yields the following 3 service methods:

• getAstronautCount: unary; returns the number of astronauts currently aboard the International Space Station.
• getAstronautNames: client streaming; after receiving a stream of client messages with astronaut index in each one, returns a single string with the names of all the astronauts corresponding to the indices given.
• getLocation: server streaming; the client sends seconds, indicating how frequent it wants the server to stream response message; at that frequency, the server sends back a timestamp along with the current latitude/longitude geo-coordinates of the International Space Station.