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<H1>[99s-extend] timeouts and slow clients in cowboy loop handler</H1>
<B>akonsu</B>
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TITLE="[99s-extend] timeouts and slow clients in cowboy loop handler">akonsu at gmail.com
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<I>Fri Sep 20 20:59:46 CEST 2013</I>
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<PRE>Understand about chunks being synchronous. that helps me tremendously to
understand how it works.
would you give me a sketchy example of how to use send_after in a loop
handler? (sorry I am new to erlang)
Konstantin
2013/9/20 Loïc Hoguin <<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>>
><i> chunk only returns when the client has received the chunk, so the
</I>><i> timestamps solution should work.
</I>><i>
</I>><i> As for the timeout, you can simply use erlang:send_after or something like
</I>><i> usual and the message will arrive in info/3.
</I>><i>
</I>><i>
</I>><i> On 09/20/2013 08:54 PM, akonsu wrote:
</I>><i>
</I>>><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>
</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
</I>>><i> 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
</I>>><i> 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>
</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>>><i>
</I>><i>
</I>><i> --
</I>><i> Loïc Hoguin
</I>><i>
</I>><i> Erlang Cowboy
</I>><i> Nine Nines
</I>><i> <A HREF="http://ninenines.eu">http://ninenines.eu</A>
</I>><i>
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