def _flush(self, buffer):
        """
        Flush the write buffers of the stream if applicable.

        Args:
            buffer (memoryview): Buffer content.
        """
        with _handle_oss_error():
            self._bucket.put_object(key=self._key, data=buffer.tobytes())
Flush the write buffers of the stream if applicable.

        Args:
            buffer (memoryview): Buffer content.