[Go] production server

[jba]

Implement NewFlowServeMux, which returns an http.ServeMux
that has a route for each defined flow.

Provide convenience functions for using that ServeMux as a server,
and also for selecting which server to use based on the current
development environment.

[jba]

@pavelgj WDYT of the API here?

• StartServer to start a server depending on GENKIT_ENV
• StartDevServer and StartProdServer if you know what you want
• NewFlowServeMux to get the prod router piece that has the flow routes, so you can make it part of a larger server.

I know the names don't quite align; do you have suggestions?
(BTW, for the js, I think "flowServer" is better than "flowsServer" because it doesn't have the double 's'.)

[ianlancetaylor]

This seems to do much more than rename some things. Not clear on what is happening here.

[ianlancetaylor]

What is this copyright message doing down here?

[jba]

Fixed.

[jba]

I tried to do a poor person's CL stack by making two separate commits. It took the message from the first instead of the second. I edited the top comment.

I meant to suggest reviewing the commits separately.

[pavelgj]

the idea is that StartProdServer should always start (regardless of currentEnvironment()), even in dev mode. Dev (reflection API) server should only run in dev mode.

So the logic here should be:

if currentEnvironment() == EnvironmentDev {
  StartDevServer(addr)
}
StartProdServer(addr)

[jba]

Ah, I see. I was going about this wrong.
I removed StartServer and changed StartProdServer to StartFlowServer.
When you call StartFlowServer, you'll get a dev server too.