Support OS allocated random TCP port

[nicolaslt]

Hi,

We would like to let the OS decide on which port our gRPC service listens on. This is achieved by passing port 0 all the way down.

Requesting for a random port already works, but we have no way of knowing which port is allocated because rxjs-grpc doesn't expose the return value of this line.

Any chance you could expose it?
Thank you

[kondi]

You can achieve it now by passing the grpc.Server instance to the serverBuilder.

const grpcServer = new grpc.Server();
const server = serverBuilder<helloworld.ServerBuilder>('helloworld.proto', 'helloworld', grpcServer);

// server.addGreeter({ ... });

const port = grpcServer.bind('0.0.0.0:0', grpc.ServerCredentials.createInsecure());
grpcServer.start();
console.log(`Listening on port ${port}`);