incompatible with uvloop because of access to private attribute _protocol

I’m using uvloop because of the significant speed up that it provides. However this seems to be incompatible with using the starttls method.

minimal example (put in actual connection information before running):

import asyncio
import uvloop
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())

import aiosmtplib

async def connect(loop):
    smtp = aiosmtplib.SMTP(
        loop=loop,
        hostname=localhost,
        port=port,
        use_tls=True)
    await smtp.connect(use_tls=False, port=port)
    await smtp.starttls(validate_certs=False)

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(connect(loop))

result

Traceback (most recent call last):
  File "minimal_example.py", line 19, in <module>
    loop.run_until_complete(connect(loop))
  File "uvloop/loop.pyx", line 1203, in uvloop.loop.Loop.run_until_complete (uvloop/loop.c:25632)
  File "minimal_example.py", line 15, in connect
    await smtp.starttls(validate_certs=False)
  File "/git/dnd/lib64/python3.6/site-packages/aiosmtplib/esmtp.py", line 193, in starttls
    tls_context, server_hostname=server_hostname, timeout=timeout)
  File "/git/dnd/lib64/python3.6/site-packages/aiosmtplib/protocol.py", line 209, in starttls
    tls_context, server_hostname=server_hostname, waiter=waiter)
  File "/git/dnd/lib64/python3.6/site-packages/aiosmtplib/protocol.py", line 82, in upgrade_transport
    self.reader._transport._protocol = tls_protocol  # type: ignore
AttributeError: 'uvloop.loop.TCPTransport' object has no attribute '_protocol'

[cole]

Hmmm, uvloop seems to handle protocols and transports a bit differently internally.

Unfortunately there is no public API to upgrade an asyncio connection in place yet, so it’s understandable that uvloop behaves differently. I’ll see if I can find a way to get it working.

[nihlaeth]

Thanks!