Dnia 2009-11-18, śro o godzinie 10:40 -0800, Niels Provos pisze: > On Mon, Nov 16, 2009 at 9:12 AM, Krzysztof Adamski <k...@japko.eu> wrote: > > 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? > > The way that chunked connections work at the moment is that you need > some other event to drive new data being sent to the client. The > problem with a single-threaded server is not blocking on the file > reads. In libevent-1.4, there is no way to set watermarks or similar > feedback mechanisms. However, as we have switched to bufferevents in > libevent-2.0; this should be possible. Watermarks seams like a good thing for my case but I just don't accually know how to use them with evhttp. I would be glad for any details (I'm libevent newbie and there is not too much of a documentation i could find, unfortunatly).
> Alternatively, you could read files in a separate process or thread > and then send data out as it becomes available. Is is not really something i would like to do. I can write a server that will serv big files to couple clients in one thread using select/poll/epoll manually with one thread and one process so i think it should be possible with libevent too. > > 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. > > The problem with how chunked connections work at the moment is that > you do not get any feedback when they client has closed the > connection. I will need to take another look at that and write a test > case for the scenario. Yes, exactly. It would be really great if there was a way to register a callback for sending more data and another one for cleaning when client is disconnected. That's not something I'm currently able to write myself, however. *********************************************************************** To unsubscribe, send an e-mail to majord...@freehaven.net with unsubscribe libevent-users in the body.
