Multiple services registered to different ports / C++

[ant...@modbot.com]

Hello, 

I'm looking to register multiple services to the same (sync) server in C++, ideally specifying a different IP / port for each.

The ServerBuilder documentation suggests that I'm able to specify a host along with the service I'm registering to the server, a la

builder.registerService(host_string, &service)

However, when I provide a host string in the format "[ip]:[port]" (or a more concrete ex; `0.0.0.0:50051`), no clients are able to successfully make RPCs to the server, calls which would otherwise work if I simply registered to the default host using registerService([service addr]). 

Providing an IP without port and vice versa don't work either. The documentation doesn't elaborate on the format the function expects for the function param std::string host. What should I be providing here?

Cheers, 

Antonia

[Yang Gao]

My understanding is that you register the service with a host string to match a client using the corresponding authority

for example

registerService("other_service.myapi.com", service)

and the client to use

client_context.set_authority("other_service.myapi.com");

and then makes the rpc.

At the server side, grpc library will first try to find an exact match of the :authority header on the wire with the registered services. If it cannot find any it will try to just look for the method name with the registered services.