List sinks for the project associated with this client.

        :type project: str
        :param project: ID of the project whose sinks are to be listed.

        :type page_size: int
        :param page_size: maximum number of sinks to return, If not passed,
                          defaults to a value set by the API.

        :type page_token: str
        :param page_token: opaque marker for the next "page" of sinks. If not
                           passed, the API will return the first page of
                           sinks.

        :rtype: tuple, (list, str)
        :returns: list of mappings, plus a "next page token" string:
                  if not None, indicates that more sinks can be retrieved
                  with another call (pass that value as ``page_token``).

def list_sinks(self, project, page_size=0, page_token=None):
        """List sinks for the project associated with this client.

        :type project: str
        :param project: ID of the project whose sinks are to be listed.

        :type page_size: int
        :param page_size: maximum number of sinks to return, If not passed,
                          defaults to a value set by the API.

        :type page_token: str
        :param page_token: opaque marker for the next "page" of sinks. If not
                           passed, the API will return the first page of
                           sinks.

        :rtype: tuple, (list, str)
        :returns: list of mappings, plus a "next page token" string:
                  if not None, indicates that more sinks can be retrieved
                  with another call (pass that value as ``page_token``).
        """
        path = "projects/%s" % (project,)
        page_iter = self._gapic_api.list_sinks(path, page_size=page_size)
        page_iter.client = self._client
        page_iter.next_page_token = page_token
        page_iter.item_to_value = _item_to_sink
        return page_iter