[Libevent-users] Handling concurent evhttp connections with evhttp_send_reply_chunk.

[Krzysztof Adamski <k@xxxxxxxx>]

Hi,
i would like to build simple HTTPD server using libevent2. It is going
to send some quite big files but i would like it to handle couple
concurrent connections. The files can be sent in chunks so I'm using
evhttp_send_reply_chunk for this. The problem is, how can I send big
files while still being able to handle new connections? 

I have found something like this in test suit:

static void
http_chunked_cb(struct evhttp_request *req, void *arg)
{
[...]
evhttp_send_reply_start(req, HTTP_OK, "Everything is fine");
event_once(-1, EV_TIMEOUT, http_chunked_trickle_cb, state, &when);
}

static void
http_chunked_trickle_cb(evutil_socket_t fd, short events, void *arg)
{
[...]
evhttp_send_reply_chunk(state->req, evb);
[...]
event_once(-1, EV_TIMEOUT, http_chunked_trickle_cb, state, &when);
[...]
}

So it basically uses event_once with EV_TIMEOUT to send next chunk.
EV_TIMEOUT is not the best for my purpose and there is also a problem
when client disconnect in the middle of the transfer, however. I can't
get fd of the connection form evhttp_request so it's impossible to set
event callback for EV_WRITE instead of EV_TIMEOUT. 

So my question is, how this should be done properly?

Thank you in advance for any suggestion.



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