[Erlyaws-list] callback on session new/end

[<wd...@fr...>]

I was very interested by the patch provided by Mr Robert David about session end notification to a cleanup Pid ('yaws_session_end' message).

But for my project I need to be notified when a session is created. So I decided to extend the patch by providing a real callback mechanism.   The callback could be a Pid or a tuple {M,F} (module, function).   Messages send to the callback pid or used as paramater in the {M,F},  are : 

	- on session expiration/deletion :   {yaws_session_end,Reson,S#ysession.cookie,S#ysession.opaque}
	- on session creation : {yaws_session_start,S#ysession.cookie,S#ysession.opaque}

I decided to send in the message the cookie value and the opaque value, because most of the times opaque value contains information that I need, and I don't want to make a new call on the session table to retrieve it. (I don't send the #ysession record because I consider that application don't have to be #ysession aware to handle the event).




Modifications :

 - the 'cleanup' field in the record ysession is now 'callback'
 - the function print_sessions display the callback configuration
 - a report_new_sess() function is called on "new_session" message
 - send_cleanup_message is replaced by send_callbackèmessage


wde