kms.py 文件源码

def _client(self, key_id):
        """Returns a Boto3 KMS client for the appropriate region.

        :param str key_id: KMS CMK ID
        """
        try:
            region_name = key_id.split(':', 4)[3]
            if self.default_region is None:
                self.default_region = region_name
        except IndexError:
            if self.default_region is None:
                raise UnknownRegionError(
                    'No default region found and no region determinable from key id: {}'.format(key_id)
                )
            region_name = self.default_region
        self.add_regional_client(region_name)
        return self._regional_clients[region_name]