views.py 文件源码

def at_front_view(self):
        if not self.request.root.properties[PROP_KEYS.QUEUE_ENABLED]:
            return HTTPFound(location=self.request.route_path("welcome"))
        # Find open slots
        total_slots = self.request.root.properties[PROP_KEYS.CONCURRENT_NUM]
        open_slots = total_slots - len(self.request.root.active)
        # Continue
        position = Queue(self.request).position(self.request.session["queue_id"])
        if position < open_slots:
            queue_id = self.request.session["queue_id"]
            items = [x for x in self.request.root.queue if x.queue_id == queue_id]
            if len(items) <= 0:
                self.request.session.flash("You are not yet at the front of the queue, please wait.", "info")
                return HTTPFound(location=self.request.route_path("queue"))
            else:
                # Check if there are too many people in "active" state
                if open_slots <= 0:
                    return HTTPFound(location=self.request.route_path("queue"))
                # Shift the person from being in queue to being active
                item = items[0]
                self.request.root.queue.remove(item)
                self.request.root.active[item.__name__] = item
                item.__parent__ = self.request.root.active
                item.queue_exit_time = item.purchase_entry_time = datetime.now()
                # Make active
                self.request.session.pop("queue_id", None)
                self.request.session["active_id"] = item.__name__
                header = remember(self.request, str(item.__name__))
                return HTTPFound(location=self.request.route_path('welcome'), headers=header)
        else:
            self.request.session.flash("You are not yet at the front of the queue, please wait.", "info")
            return HTTPFound(location=self.request.route_path("queue"))