I am using libmicrohttpd in a multithreaded application in the
thread-per-connection mode. In order to maintain statistics and such on
the various clients, the application should be notified about
connections being started and stopped. Something like the
MHD_OPTION_NOTIFY_COMPLETED for requests, but then for connections. As
far as I could find libmicrohttpd does not (yet) provide that functionality.
Attached is a patch that does add this functionality by registering a
connection notification callback function: MHD_OPTION_NOTIFY_CONNECTION
(inspired by the MHD_OPTION_NOTIFY_COMPLETED option).
Could this be included in libmicrohttpd?
=>
The patch was only working for multithreaded apps, so I adjusted it
to cover other threading models, fixed a merge issue and added the
ability to associate a void* with the callbacks (and obtain it via
MHD connection info). And I updated the manual & ChangeLog. Now
I think it can be included ;-).
I attach the first attempt on SO_REUSEPORT. The patch is available
either at https://github.com/foxik/libmicrohttpd/commit/9ce9422742e10458f87275ea202a982e00c2b88c
or attached. (It is against the version with
MHD_DAEMON_OPTION_CURRENT_CONNECTIONS, but I can rebase it to current
SVN HEAD if you want.)
It seems that a reasonably multiplatform way of detecting SO_REUSEPORT is
#ifdef SO_REPOSEPORT
which is used for example by Perl. For SO_EXCLUSIVEADDRUSE, the same
strategy seems to work too, according to Windows SDK headers and MinGW
WinAPI headers.
The current patch adds an option to allowing/disallowing address:port
reuse. One remark:
- currently both nonexisting SO_xxx and setsockopt failure are fatal and
MHD_start_daemon fails. That may be too harsh -- maybe the
MHD_OPTION_LISTENING_ADDRESS_REUSE should be only a hint.
Nevertheless, as one can freely not use
MHD_OPTION_LISTENING_ADDRESS_REUSE option, I chose the "fail on error"
behaviour.
Thanks,
cheers,
Milan Straka
Original patch modified to get rid of some redundant USE_DEBUG
checks, fix indentation, and #ifndef SO_REUSEPORT on Linux,
we try be #defining it to 15 ourselves.
Date: Wed, 29 Oct 2014 09:59:09 +0100
Subject: [PATCH 2/2] Add MHD_DAEMON_INFO_CURRENT_CONNECTIONS to
MHD_DaemonInfoType.
The MHD_DAEMON_INFO_CURRENT_CONNECTIONS returns number of current
connections handled by the daemon.
Useful after MHD_quiesce_daemon to find out whether all connections
have been served.
Christian Grothoff
Sree Harsha Totakura
Evgeny Grin (Karlson2k)
LRN