This is a simple gRPC to Websocket API proxy. This could be useful if you want to wrap a websocket API that you don't control in a gRPC service.
The interface is defined in proto/rand/v1/rand.proto. It defines a single RandomNumberService that return random numbers between the optional min and max parameters. The request can be unary or a stream, the stream will return a rnadom number every second until cancelled.
The gRPC server will open a connection to the websocket service tht actually calculates the random numbers. The point is just a proof of concept to show that one can proxy a websocket service with gRPC relatively easily whithout composing the quality of service.
the gRPC server relies on code generation npm run gen to generate the types.
Both servers can then be started with npm run dev from their respective directories.
The gRPC server can be called with grpcurl: grpcurl -plaintext '0.0.0.0:8081' rand.v1.RandomNumberService/RandomNumber
This is obviosly not production ready code, some of the things that should implemented in a real world scenario are:
- A generic version of the Websocket instance that takes care of reduces the boilerplate
- Reusable websocket connections, eespecially for the unary requests
- Timeouts
- Message validation
- Retry logic if the connection goes away