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Re: User registration/authentication

Another thing is UuServlet::isUserLoggedIn() function.
This function was desinged before Alexey's idea with using temporary table
for authentication. I don't quite see the use of it now.
isUserLoggedIn() checks if there is an entry in session_info table, so it
connects to DB and has to be called after UuDbPool::getConnection(). The
way I have it implemented now, getConnection returns NULL if
1. No connection in pool available even after timeout, in this case i
don't call servlet's dispatcher and user sees "Server error" page.
2. login() stored proc failed. In this case con = NULL too, but I think
I'll redirect user to the login page.
So my idea is to return structure something like this(Connection& con, int
failureReason) after calling getConnection().
There is no reason to call isUserLoggedIn() after that. If con=NULL AND
failureReason=2( login() failed ), then user not logged in. Otherwise user
is logged in.

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