Method update

web/utils.py:493–498

(block=False)

                self.running[key] = threading.Lock()

        def update(block=False):
            if self.running[key].acquire(block):
                try:
                    self.cache[key] = (self.func(*args, **keywords), time.time())
                finally:
                    self.running[key].release()

        if key not in self.cache:
            update(block=True)