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Make server Ctrl-C safe [patch]
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Gracjan Polak  
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 More options Apr 20 2010, 1:43 am
From: Gracjan Polak <gracjanpo...@gmail.com>
Date: Tue, 20 Apr 2010 07:43:05 +0200
Local: Tues, Apr 20 2010 1:43 am
Subject: Make server Ctrl-C safe [patch]
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Hi Jeremy and all,

Would be really good to include this patch before 0.5, as it really enables
GHCi-style development for GuestBook example app.

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Gracjan

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  make-server-ctrl_c-safe.dpatch
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Jeremy Shaw  
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 More options Apr 20 2010, 8:45 am
From: Jeremy Shaw <jer...@n-heptane.com>
Date: Tue, 20 Apr 2010 07:45:31 -0500
Local: Tues, Apr 20 2010 8:45 am
Subject: Re: Make server Ctrl-C safe [patch]
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applied. Do you think we should add withSystemState' to happstack-
state ?

Also, I am not convinced this patch will really enable GHCi style  
development. In my experience, killing the main http thread does not  
actually stop the server from listening, because there are other  
threads still listening. And even if you reload/restart the  
application, your request might be handled by an old thread? As a  
result, you are force to completely restart GHCi between runs :(

There is some code in Happstack.Util.Concurrent related to this  
problem -- no idea if it is actually useful though.

thanks for the patches though!
- jeremy

On Apr 20, 2010, at 12:43 AM, Gracjan Polak wrote:

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Gracjan Polak  
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 More options Apr 20 2010, 9:15 am
From: Gracjan Polak <gracjanpo...@gmail.com>
Date: Tue, 20 Apr 2010 06:15:37 -0700 (PDT)
Local: Tues, Apr 20 2010 9:15 am
Subject: Re: Make server Ctrl-C safe [patch]
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On 20 Kwi, 14:45, Jeremy Shaw <jer...@n-heptane.com> wrote:

> applied. Do you think we should add withSystemState' to happstack-
> state ?

I took it from happstack-extra and I'm all for putting it into
happstack proper!

> Also, I am not convinced this patch will really enable GHCi style  
> development. In my experience, killing the main http thread does not  
> actually stop the server from listening, because there are other  
> threads still listening. And even if you reload/restart the  
> application, your request might be handled by an old thread? As a  
> result, you are force to completely restart GHCi between runs :(

Well, works in devel scenario where I'm the sole user of the app. Kill
the logger (so files are closed), kills state (so files are closed)
and kills http thread (so port is freed and socket is closed). For
devel and debug this is enough!

BTW: killThread with httpPid really closes the socket, because
simpleHTTP has proper `bracket` where it should.

It is probably also correct in the compiled code case, when somebody
hits Ctrl-C then it tries to do rather clean exit.

> There is some code in Happstack.Util.Concurrent related to this  
> problem -- no idea if it is actually useful though.

I'll check that later, I've never looked inside this module before...

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