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<H1>[99s-extend] timeouts and slow clients in cowboy loop handler</H1>
<B>Loïc Hoguin</B>
<A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20timeouts%20and%20slow%20clients%20in%20cowboy%20loop%20handler&In-Reply-To=%3C523C9A5F.3080805%40ninenines.eu%3E"
TITLE="[99s-extend] timeouts and slow clients in cowboy loop handler">essen at ninenines.eu
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<I>Fri Sep 20 20:56:31 CEST 2013</I>
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<PRE>chunk only returns when the client has received the chunk, so the
timestamps solution should work.
As for the timeout, you can simply use erlang:send_after or something
like usual and the message will arrive in info/3.
On 09/20/2013 08:54 PM, akonsu wrote:
><i> thanks!
</I>><i>
</I>><i> how to implement timeout callback manually? if I had receive then I
</I>><i> would just use timeout clause there, but with the handler I do not know...
</I>><i>
</I>><i> I have doubts about validity of my question on the erlang list. I later
</I>><i> realised that there is no problem receiving messages in my handler from
</I>><i> my upstream process, I can do it fast enough and shove everything to the
</I>><i> response. my real problem is to determine if the http client is reading
</I>><i> fast enough from the response...
</I>><i>
</I>><i>
</I>><i> 2013/9/20 Loïc Hoguin <<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A> <mailto:<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>>>
</I>><i>
</I>><i> Loop handlers close after a while regardless of what you send, it
</I>><i> only checks what the client sends. The best way for you would be to
</I>><i> disable that timeout and handle it manually.
</I>><i>
</I>><i> As for the second question, I'm still reading the thread on
</I>><i> erlang-questions but I've seen some good ideas about timestamps so far.
</I>><i>
</I>><i>
</I>><i> On 09/20/2013 08:47 PM, akonsu wrote:
</I>><i>
</I>><i> Hi,
</I>><i>
</I>><i> I am using loop handler and I stream from it:
</I>><i>
</I>><i> info({stream, Part}, Req, S) ->
</I>><i> ok = cowboy_req:chunk(Part, Req),
</I>><i> {loop, Req, S, hibernate};
</I>><i>
</I>><i> I have two questions:
</I>><i>
</I>><i> 1. on timeouts cowboy sends 204 No Content. In my case it is not the
</I>><i> right response because I may have already sent some data. Is
</I>><i> there a way
</I>><i> to send a custom response?
</I>><i>
</I>><i> 2. how to check if the client is too slow and is not reading the
</I>><i> response stream fast enough? If this happens, then I need to
</I>><i> disconnect.
</I>><i>
</I>><i> I can live without 1. but I need to figure out 2. Please help.
</I>><i>
</I>><i> thank you!
</I>><i> Konstantin
</I>><i>
</I>><i>
</I>><i>
</I>><i> _________________________________________________
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</I>><i>
</I>><i>
</I>><i> --
</I>><i> Loďc Hoguin
</I>><i> Erlang Cowboy
</I>><i> Nine Nines
</I>><i> <A HREF="http://ninenines.eu">http://ninenines.eu</A>
</I>><i>
</I>><i>
</I>
--
Loïc Hoguin
Erlang Cowboy
Nine Nines
<A HREF="http://ninenines.eu">http://ninenines.eu</A>
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