[99s-extend] timeouts and slow clients in cowboy loop handler

[akonsu]

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 <essen at ninenines.eu>

> 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:
>
>> thanks!
>>
>> how to implement timeout callback manually? if I had receive then I
>> would just use timeout clause there, but with the handler I do not know...
>>
>> I have doubts about validity of my question on the erlang list.  I later
>> realised that there is no problem receiving messages in my handler from
>> my upstream process, I can do it fast enough and shove everything to the
>> response. my real problem is to determine if the http client is reading
>> fast enough from the response...
>>
>>
>> 2013/9/20 Loïc Hoguin <essen at ninenines.eu <mailto:essen at ninenines.eu>>
>>
>>
>>     Loop handlers close after a while regardless of what you send, it
>>     only checks what the client sends. The best way for you would be to
>>     disable that timeout and handle it manually.
>>
>>     As for the second question, I'm still reading the thread on
>>     erlang-questions but I've seen some good ideas about timestamps so
>> far.
>>
>>
>>     On 09/20/2013 08:47 PM, akonsu wrote:
>>
>>         Hi,
>>
>>         I am using loop handler and I stream from it:
>>
>>         info({stream, Part}, Req, S) ->
>>               ok = cowboy_req:chunk(Part, Req),
>>               {loop, Req, S, hibernate};
>>
>>         I have two questions:
>>
>>         1. on timeouts cowboy sends 204 No Content. In my case it is not
>> the
>>         right response because I may have already sent some data. Is
>>         there a way
>>         to send a custom response?
>>
>>         2. how to check if the client is too slow and is not reading the
>>         response stream fast enough? If this happens, then I need to
>>         disconnect.
>>
>>         I can live without 1. but I need to figure out 2. Please help.
>>
>>         thank you!
>>         Konstantin
>>
>>
>>
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>>
>>
>>     --
>>     Loďc Hoguin
>>     Erlang Cowboy
>>     Nine Nines
>>     http://ninenines.eu
>>
>>
>>
>
> --
> Loïc Hoguin
>
> Erlang Cowboy
> Nine Nines
> http://ninenines.eu
>
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