What's the equivalent of get_extra_info("peername"), but for the server side? Tried get_extra_info("sockname"), but no luck.

[DavesCodeMusings]

I've got some code using asyncio.start_server() and I'm trying to determine the port for the new connection on the server side. I have no problem getting info for the client side with get_extra_info("peername"), but I cannot figure out how to do it for the server side.

The CPython way seems to be by using data_writer.get_extra_info("sockname"), but rather than getting the server side info, I get an exception KeyError: sockname. I tried data_reader.get_extra_info("sockname") as well, but got the same exception.

What I'm trying to do is figure out what TCP port the client connected to on the server side from within my on_connect() function. The code below shows my attempt to find that with get_extra_info("sockname").

Any suggestions on how I can get the server side TCP port number?

Thanks much!

    async def on_data_connect(self, data_reader, data_writer):
        """
        Handler for PASV data connections. Remember the streams for later commands.
        """
        client_ip = data_writer.get_extra_info("peername")[0]
        server_side = data_writer.get_extra_info("sockname")
        if self.debug:
            print("Data connection from:", client_ip)
            print("Server side:", server_side)

[glenn20]

It would seem that micropython does not support the socket.getsockname() function (though lwip supports it) and so the Stream class can't populate the `"sockname" property of the streamreader.

[shawwwn]

Are there plans to add .getsockname() and .getpeername() to socket module? Thanks!

[sophiedegran]

On micropython 1.22.2 with asyncio v3
peername is on the StreamReader not the StreamWriter (as it is on python)
so it will be:
client_ip = data_reader.get_extra_info ('peername')