New submission from Ian Good <icg...@gmail.com>:

There does not seem to be a public API for replacing the transport of the 
StreamReader / StreamWriter provided to the callback of a call to 
asyncio.start_server().

The only way I have found to use the new SSL transport is to update protected 
members of the StreamReaderProtocol object, e.g.:

    async def callback(reader, writer):
        loop = asyncio.get_event_loop()
        transport = writer.transport
        protocol = transport.get_protocol()
        new_transport = await loop.start_tls(
            transport, protocol, ssl_context, server_side=True)
        protocol._stream_reader = StreamReader(loop=loop)
        protocol._client_connected_cb = do_stuff_after_start_tls
        protocol.connection_made(new_transport)

    async def do_stuff_after_start_tls(ssl_reader, ssl_writer): ...

----------
components: asyncio
messages: 327665
nosy: asvetlov, icgood, yselivanov
priority: normal
severity: normal
status: open
title: start_tls() difficult when using asyncio.start_server()
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34975>
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