cohttp-eio: Expose local address to bind server to

[patricoferris]

Currently running a cohttp-eio server only allows a user to set the port number of the local address to listen on, I think it would be good to let the user pass a full Eio.Net.Sockaddr.stream into the function so users can:

• Change the IP address for a TCP socket (e.g. Eio.Net.Ipaddr.V4.any)
• Use a Unix domain socket if possible

cc: @bikallem @talex5

[talex5]

Note that you can use connection_handler to make your own run function fairly easily. We might want to provide an Eio.Net.run_server function in Eio (like Lwt has Lwt_io.establish_server).

Some other problems we might want to fix with that:

• The cohttp version forces ~reuse_port:true, which should really be optional.
• It requires a domain manager even if you don't need multiple domains.

[patricoferris]

Note that you can use connection_handler to make your own run function fairly easily. We might want to provide an Eio.Net.run_server function in Eio (like Lwt has Lwt_io.establish_server).

Ah, thanks! Yes I think making that a bit more obvious would be helpful (although it might just be me...). Plus one for Eio.Net.run_server and then I think a doc comment with an example would be great too :))