[Haskell-cafe] Lifetime control of webserver

[Doug Burke]

You could also look at ekg for "inspiration" (at least for the "expose data
via a URL" part): http://hackage.haskell.org/package/ekg

Doug

On Thu, Jul 12, 2018 at 10:55 PM Lyndon Maydwell <maydwell at gmail.com> wrote:

> Yes that's what I had in mind.
>
> You can do some fun things with Control.Concurrent.Chan as well if you
> need special sequencing, or limits on requests served or callbacks into the
> main thread etc.
>
>
>  - Lyndon
>
> On Fri, Jul 13, 2018 at 12:32 PM ☂Josh Chia (謝任中) <joshchia at gmail.com>
> wrote:
>
>> Do you mean something like calling the scotty function in a server thread
>> and then killing the server thread when I want to stop serving? If proper
>> cleanup happens when I kill the thread, this should work for me.
>>
>> On Fri, Jul 13, 2018 at 10:01 AM Lyndon Maydwell <maydwell at gmail.com>
>> wrote:
>>
>>> 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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