I have lost one day with struggling with django sessions and it seems that
I am not really able to resolve it without coding my own sessions
middleware or using some locking. The problem is, sessions are not stored
even if the saving is triggered manually. It happens now and then, because
of race condition which occurs when multiple simultaneous AJAX requests are
sent from the client side. I'm using db backend. The thing is, everything
is ok when calling only one start() dajaxice call from the javascript side.
So the question, why session is not stored sometimes? Should I lock the
segment, where session is being stored? I double checked session_key is
still the same. Should not be this resolved in the session middleware
module?
Settings: SESSION_SAVE_EVERY_REQUEST = True
def print_session_keys(request, tmp):
session_key = request.session.session_key
session = Session.objects.get(session_key=session_key)
a = session.get_decoded()
print tmp+str(a.keys())
@dajaxice_registerdef start(request):
dajax = Dajax()
searchHash = os.urandom(16).encode('hex')
data = 1
print_session_keys(request, 'Before: - hash: '+searchHash+' ')
request.session.set_expiry(0)
request.session[searchHash] = data
request.session.modified = True
request.session.save()
print_session_keys(request, 'After: - hash: '+searchHash+' ')
*LOG:*
1 or 2 requestes of 3, are stored fine:
Before: - hash: 05f22e8e828a0e6145519e0bb0778357
[u'b0d0d5e4ebe846c4e3ffa66bfbd2e7e3', u'usermode', u'_session_expiry']
After: - hash: 05f22e8e828a0e6145519e0bb0778357
[u'09cf89e0cbe5fb6a179e1f658d452c6b', u'05f22e8e828a0e6145519e0bb0778357',
u'usermode', u'b0d0d5e4ebe846c4e3ffa66bfbd2e7e3', u'_session_expiry']
BUT:
Before: - hash: 071e79041aba16a82a32fe4a77c3b4e0
[u'b0d0d5e4ebe846c4e3ffa66bfbd2e7e3', u'usermode', u'_session_expiry']
After: - hash: 071e79041aba16a82a32fe4a77c3b4e0
[u'09cf89e0cbe5fb6a179e1f658d452c6b', u'05f22e8e828a0e6145519e0bb0778357',
u'usermode', u'b0d0d5e4ebe846c4e3ffa66bfbd2e7e3', u'_session_expiry']
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