def process_request(self, request):
        # don't process AJAX requests
        if request.is_ajax():
            return

        # create some useful variables
        ip_address = utils.get_ip(request)
        user_agent = request.META.get('HTTP_USER_AGENT', '')[:255]

        if hasattr(request, 'session'):
            # use the current session key if we can
            session_key = request.session.session_key
            if session_key is None:
                # The session must not be stored yet.
                # We will wait until we have a session_key on the next
                # request. This has a nice side-effect of not attempting
                # to track hit-and-runners like spiders and bots.
                return
        else:
            # otherwise just fake a session key
            session_key = '%s:%s' % (ip_address, user_agent)

        prefixes = getattr(settings, 'ACTIVEUSERS_IGNORE_PREFIXES', [])

        # ensure that the request.path does not begin with any of the prefixes
        for prefix in prefixes:
            if request.path.startswith(prefix):
                log.debug('Not tracking request to: %s' % request.path)
                return

        # if we get here, the URL needs to be tracked
        # determine what time it is
        now = timezone.now()

        attrs = {'session_key': session_key, 'ip_address': ip_address}

        # for some reason, Visitor.objects.get_or_create was not working here
        try:
            visitor = Visitor.objects.get(**attrs)
        except Visitor.DoesNotExist:
            # see if there's a visitor with the same IP and user agent
            # within the last 5 minutes
            cutoff = now - timedelta(minutes=5)
            visitors = Visitor.objects.filter(ip_address=ip_address,
                                              user_agent=user_agent,
                                              last_update__gte=cutoff)

            if len(visitors):
                visitor = visitors[0]
                visitor.session_key = session_key
                log.debug('Using existing visitor for IP %s / UA %s: %s' %
                          (ip_address, user_agent, visitor.id))
            else:
                # it's probably safe to assume that the visitor is brand new
                visitor = Visitor(**attrs)
                log.debug('Created a new visitor: %s' % attrs)
        except StandardError:
            return

        # determine whether or not the user is logged in
        user = request.user
        if isinstance(user, AnonymousUser):
            user = None

        # update the tracking information
        visitor.user = user
        visitor.user_agent = user_agent

        # if the visitor record is new, or the visitor hasn't been here for
        # at least an hour, update their referrer URL
        one_hour_ago = now - timedelta(hours=1)
        if not visitor.last_update or visitor.last_update <= one_hour_ago:
            referrer = request.META.get('HTTP_REFERER', 'unknown')
            visitor.referrer = utils.u_clean(referrer[:255])

            # reset the number of pages they've been to
            visitor.page_views = 0
            visitor.session_start = now

        visitor.url = request.path
        visitor.page_views += 1
        visitor.last_update = now
        try:
            visitor.save()
        except IntegrityError:
            # If we received an IntegrityError on ``session_key`` not unique,
            # it's probably because Django tried to do an INSERT, but another
            # request from the same User was able to INSERT ahead of us.
            # Try again with an UPDATE query.
            visitor.id = Visitor.objects.get(
                session_key=visitor.session_key).id
            visitor.save(force_update=True)
    def process_request(self, request):
        # don't process AJAX requests
        if request.is_ajax(): return

        # create some useful variables
        ip_address = utils.get_ip(request)
        user_agent = request.META.get('HTTP_USER_AGENT', '')[:255]

        if hasattr(request, 'session'):
            # use the current session key if we can
            session_key = request.session.session_key
        else:
            # otherwise just fake a session key
            session_key = '%s:%s' % (ip_address, user_agent)

        prefixes = getattr(settings, 'ACTIVEUSERS_IGNORE_PREFIXES', [])

        # ensure that the request.path does not begin with any of the prefixes
        for prefix in prefixes:
            if request.path.startswith(prefix):
                log.debug('Not tracking request to: %s' % request.path)
                return

        # if we get here, the URL needs to be tracked
        # determine what time it is
        now = datetime.now()

        attrs = {
            'session_key': session_key,
            'ip_address': ip_address
        }

        # for some reason, Visitor.objects.get_or_create was not working here
        try:
            visitor = Visitor.objects.get(**attrs)
        except Visitor.DoesNotExist:
            # see if there's a visitor with the same IP and user agent
            # within the last 5 minutes
            cutoff = now - timedelta(minutes=5)
            visitors = Visitor.objects.filter(
                ip_address=ip_address,
                user_agent=user_agent,
                last_update__gte=cutoff
            )

            if len(visitors):
                visitor = visitors[0]
                visitor.session_key = session_key
                log.debug('Using existing visitor for IP %s / UA %s: %s' % (ip_address, user_agent, visitor.id))
            else:
                # it's probably safe to assume that the visitor is brand new
                visitor = Visitor(**attrs)
                log.debug('Created a new visitor: %s' % attrs)
        except:
            return

        # determine whether or not the user is logged in
        user = request.user
        if isinstance(user, AnonymousUser):
            user = None

        # update the tracking information
        visitor.user = user
        visitor.user_agent = user_agent

        # if the visitor record is new, or the visitor hasn't been here for
        # at least an hour, update their referrer URL
        one_hour_ago = now - timedelta(hours=1)
        if not visitor.last_update or visitor.last_update <= one_hour_ago:
            visitor.referrer = utils.u_clean(request.META.get('HTTP_REFERER', 'unknown')[:255])

            # reset the number of pages they've been to
            visitor.page_views = 0
            visitor.session_start = now

        visitor.url = request.path
        visitor.page_views += 1
        visitor.last_update = now
        try:
            visitor.save()
        except DatabaseError:
            log.error('There was a problem saving visitor information:\n%s\n\n%s' % (traceback.format_exc(), locals()))
    def process_request(self, request):
        # don't process AJAX requests
        if request.is_ajax():
            return

        # create some useful variables
        ip_address = utils.get_ip(request)
        user_agent = request.META.get("HTTP_USER_AGENT", "")[:255]

        if hasattr(request, "session"):
            # use the current session key if we can
            session_key = request.session.session_key
            if session_key is None:
                # The session must not be stored yet.
                # We will wait until we have a session_key on the next
                # request. This has a nice side-effect of not attempting
                # to track hit-and-runners like spiders and bots.
                return
        else:
            # otherwise just fake a session key
            session_key = "%s:%s" % (ip_address, user_agent)

        prefixes = getattr(settings, "ACTIVEUSERS_IGNORE_PREFIXES", [])

        # ensure that the request.path does not begin with any of the prefixes
        for prefix in prefixes:
            if request.path.startswith(prefix):
                log.debug("Not tracking request to: %s" % request.path)
                return

        # if we get here, the URL needs to be tracked
        # determine what time it is
        now = timezone.now()

        attrs = {"session_key": session_key, "ip_address": ip_address}

        # for some reason, Visitor.objects.get_or_create was not working here
        try:
            visitor = Visitor.objects.get(**attrs)
        except Visitor.DoesNotExist:
            # see if there's a visitor with the same IP and user agent
            # within the last 5 minutes
            cutoff = now - timedelta(minutes=5)
            visitors = Visitor.objects.filter(ip_address=ip_address, user_agent=user_agent, last_update__gte=cutoff)

            if len(visitors):
                visitor = visitors[0]
                visitor.session_key = session_key
                log.debug("Using existing visitor for IP %s / UA %s: %s" % (ip_address, user_agent, visitor.id))
            else:
                # it's probably safe to assume that the visitor is brand new
                visitor = Visitor(**attrs)
                log.debug("Created a new visitor: %s" % attrs)
        except StandardError:
            return

        # determine whether or not the user is logged in
        user = request.user
        if isinstance(user, AnonymousUser):
            user = None

        # update the tracking information
        visitor.user = user
        visitor.user_agent = user_agent

        # if the visitor record is new, or the visitor hasn't been here for
        # at least an hour, update their referrer URL
        one_hour_ago = now - timedelta(hours=1)
        if not visitor.last_update or visitor.last_update <= one_hour_ago:
            referrer = request.META.get("HTTP_REFERER", "unknown")
            visitor.referrer = utils.u_clean(referrer[:255])

            # reset the number of pages they've been to
            visitor.page_views = 0
            visitor.session_start = now

        visitor.url = request.path
        visitor.page_views += 1
        visitor.last_update = now
        try:
            visitor.save()
        except IntegrityError:
            # If we received an IntegrityError on ``session_key`` not unique,
            # it's probably because Django tried to do an INSERT, but another
            # request from the same User was able to INSERT ahead of us.
            # Try again with an UPDATE query.
            visitor.id = Visitor.objects.get(session_key=visitor.session_key).id
            visitor.save(force_update=True)