agent: support multiple http address in addresses.http

[kevinschoonover]

naive partial support for #9257 (HTTP addresses only) by creating a http.Server for every space-seperated address defined in addresses.http. Example:

addresses {
  http="127.0.0.1 {{ GetPrivateIP }} ..."
}

Hoping to get some feedback if this is the approach that should be take or something like consul is doing by abstracting the servers into apiserver.go. There are also one or two TODOs I am not sure the best approach to take.

[tgross]

Hi @kevinschoonover! Thanks for this PR -- this is looking really good! I've left a few comments in command/agent/http.go where I think it'd be good to see what's safe to reuse across listeners.

Hoping to get some feedback if this is the approach that should be take or something like consul is doing by abstracting the servers into apiserver.go.

Nomad's has a bit of a stronger difference in the RPC server between servers and clients than Consul does, so I think trying to abstract it the way they've done would probably be more trouble than it's worth (especially at this point in time). The approach you've got here works fine for HTTP. I think RPC is going to prove to be more complicated if we try to do that.

[kevinschoonover]

Hey @tgross, anything left pending for me on this PR that I can help address?

[tgross]

Hi @kevinschoonover! I think I missed one last item and that should get this into good shape.

[tgross]

Sorry, I think I missed this in the first pass, but we'll want this to return a slice of pointers (ex []*HTTPServer) so that we're not changing the semantics of mutability on the servers. See https://play.golang.com/p/JzckJ_BBiXb as an example of why.

[kevinschoonover]

@tgross should be good now and I reran the tests and everything looks good. One thing I did notice is that when I ran the command/agent tests I was seeing:

[WARN] freeport: 2 out of 2 pending ports are still in use; something probably didn't wait around for the port to be closed!

but I also see that on master so I think its unrelated to the changes.

[tgross]

LGTM! Thanks @kevinschoonover!

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