gce.py 文件源码

def _refresh(self, http_request):
        """Refreshes the access_token.

        Skip all the storage hoops and just refresh using the API.

        Args:
            http_request: callable, a callable that matches the method
                          signature of httplib2.Http.request, used to make
                          the refresh request.

        Raises:
            HttpAccessTokenRefreshError: When the refresh fails.
        """
        query = '?scope=%s' % urllib.parse.quote(self.scope, '')
        uri = META.replace('{?scope}', query)
        response, content = http_request(uri)
        content = _from_bytes(content)
        if response.status == 200:
            try:
                d = json.loads(content)
            except Exception as e:
                raise HttpAccessTokenRefreshError(str(e),
                                                  status=response.status)
            self.access_token = d['accessToken']
        else:
            if response.status == 404:
                content += (' This can occur if a VM was created'
                            ' with no service account or scopes.')
            raise HttpAccessTokenRefreshError(content, status=response.status)