We developed an alternate asyncio TLS transport based on GnuTLS (https://pypi.org/project/aio-gnutls-transport/). In this project we want to support half-closed TLS connections (WriteTransport.write_eof()).


Unfortunately StreamReaderProtocol won't interoperate properly without a monkey patch because its eof_received() method returns True for any ssl transport (this is to avoid a warning in the _SSLProtocolTransport):

    def eof_received(self):
        self._stream_reader.feed_eof()
        if self._over_ssl:
            # Prevent a warning in SSLProtocol.eof_received:
            # "returning true from eof_received()
            # has no effect when using ssl"
            return False
        return True

As this is an unspecified internal feature, very specific to the _SSLProtocolTransport class (which issues the warning), we think the test should be made explicitly against this class (see the attached patch).

StreamReaderProtocol is tightly coupled with builtin asyncio transports.
Even worse, it is an internal class actually.
If you want a code to operate with custom transports -- perhaps you need to reimplement streams for them as well.