sessions.py 文件源码

def clean_up(self):
        """Clean up expired sessions."""
        now = self.now()
        # Iterate over all session files in self.storage_path
        for fname in os.listdir(self.storage_path):
            if (fname.startswith(self.SESSION_PREFIX)
                    and not fname.endswith(self.LOCK_SUFFIX)):
                # We have a session file: lock and load it and check
                #   if it's expired. If it fails, nevermind.
                path = os.path.join(self.storage_path, fname)
                self.acquire_lock(path)
                if self.debug:
                    # This is a bit of a hack, since we're calling clean_up
                    # on the first instance rather than the entire class,
                    # so depending on whether you have "debug" set on the
                    # path of the first session called, this may not run.
                    cherrypy.log('Cleanup lock acquired.', 'TOOLS.SESSIONS')

                try:
                    contents = self._load(path)
                    # _load returns None on IOError
                    if contents is not None:
                        data, expiration_time = contents
                        if expiration_time < now:
                            # Session expired: deleting it
                            os.unlink(path)
                finally:
                    self.release_lock(path)