[Haskell-cafe] Lifetime control of webserver

Lyndon Maydwell maydwell at gmail.com
Fri Jul 13 02:00:58 UTC 2018


Not sure if I'm missing something, but is there any reason why you couldn't
spin up the server in a thread then kill it when required?


 - Lyndon

On Fri, Jul 13, 2018 at 11:51 AM ☂Josh Chia (謝任中) <joshchia at gmail.com>
wrote:

> Hi,
>
> My application is not a webserver but needs to run a webserver for part
> but not all of its lifetime. Particularly, there's a part that does some
> complex computation and I want a webserver to expose its internal
> state/progress through HTTP.
>
> It seems that the typical and expected way to use a webserver is to
> designate the entire app itself as a webserver, so that functions like the
> following are basically infinite loops that serve HTTP:
>
> Web.Scotty.scotty:
> http://hackage.haskell.org/package/scotty-0.11.2/docs/Web-Scotty.html#v:scotty
>
> Network.Wai.Handler.Warp.run:
> http://hackage.haskell.org/package/warp-3.2.22/docs/Network-Wai-Handler-Warp.html#v:run
>
> Can I run a webserver with explicit control of its lifetime? Particularly,
> I want to be able to kill it without killing the app or explicitly serve
> one request at a time. I'm not restricted to scotty or warp.
>
> Josh
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