caching.py 文件源码

def get(self):
        """Return the current variant if in the cache, else None."""
        request = cherrypy.serving.request
        self.tot_gets += 1

        uri = cherrypy.url(qs=request.query_string)
        uricache = self.store.get(uri)
        if uricache is None:
            return None

        header_values = [request.headers.get(h, '')
                         for h in uricache.selecting_headers]
        variant = uricache.wait(key=tuple(sorted(header_values)),
                                timeout=self.antistampede_timeout,
                                debug=self.debug)
        if variant is not None:
            self.tot_hist += 1
        return variant