Add unix domain socket listener to service.ListenAndServeUnix

[hatajoe]

Hi.

I very often use unix domain socket listener with HTTP proxy server. (e.g, Nginx)
In goa, it looks no way to use that.
This p-r add function service.ListenAndServeUnix that support unix domain socket listener.
Can you review this?

Thank you.

[raphael]

Thanks for the PR! goa has to compile / run on Windows and in App Engine (package syscall cannot be used there). Also it seems a bit strange to handle signals only when listening on a Unix socket. Given all this and how it's simple to do this in your own code I'm not sure this is worth adding to goa. Is there a reason you cannot have that code outside? Maybe this should be an example instead.

[hatajoe]

Sorry, I was not able to consider multiple environments.
And certainly seems little bit strange.

I will take you another approach that inject listener to function like net.http.Serve.
This approach seems simple than before.
Would you like about this? (I will push soon)

[raphael]

This approach seems much better indeed, thank you! Just one nitpick: do you think you could change the comment of the method to something like:

// Serve accepts incoming HTTP connections on the listener l, invoking the service mux handler for each.

Thank you!

[hatajoe]

I fixed it.
My English is not good enough ;)
Thank you for your review.

[raphael]

This is great thank you! Do you think you could also make a PR against the v1 branch?

[hatajoe]

I made a p-r #838 .
but seems something I was wrong?