AttributeError: type object 'GreenSocket' has no attribute 'sendmsg'

[maldororxul]

AttributeError: type object 'GreenSocket' has no attribute 'sendmsg'

[A5rocks]

As a quick fix you can probably import trio before monkey patching. This will cache trio with un-patched system things.

There has to be a way to fix this that isn't just a game of whack-a-mole but I don't have any ideas.

[maldororxul]

If I import trio before monkey patching it will fall with "AttributeError: module 'select' has no attribute 'epoll'".

I ended up with this to avoid both attribute errors:

def monkey_patch_trio():
    try:
        import select
        if not hasattr(select, 'epoll'):
            class FakeEpoll:
                def __init__(self, *args, **kwargs):
                    raise NotImplementedError("epoll is not supported on this platform")

            fake_select_module = ModuleType("select")
            fake_select_module.epoll = FakeEpoll
            sys.modules["select"] = fake_select_module

        # Patch GreenSocket before trio._socket is imported
        from eventlet.greenio.base import GreenSocket as EventletGreenSocket

        if not hasattr(EventletGreenSocket, 'sendmsg'):
            setattr(EventletGreenSocket, 'sendmsg', lambda *args, **kwargs: None)
        if not hasattr(EventletGreenSocket, 'recvmsg'):
            setattr(EventletGreenSocket, 'recvmsg', lambda *args, **kwargs: None)
        if not hasattr(EventletGreenSocket, 'recvmsg_into'):
            setattr(EventletGreenSocket, 'recvmsg_into', lambda *args, **kwargs: None)

        # Now import trio._socket
        import trio._socket as trio_socket
        import socket as _stdlib_socket
        from functools import wraps as _wraps

        class PatchedSocketType(trio_socket.SocketType):
            @_wraps(_stdlib_socket.socket.sendmsg, assigned=(), updated=())
            def sendmsg(self, *args, **kwargs):
                raise NotImplementedError("sendmsg is not supported on this platform")

            @_wraps(_stdlib_socket.socket.recvmsg, assigned=(), updated=())
            def recvmsg(self, *args, **kwargs):
                raise NotImplementedError("recvmsg is not supported on this platform")

            @_wraps(_stdlib_socket.socket.recvmsg_into, assigned=(), updated=())
            def recvmsg_into(self, *args, **kwargs):
                raise NotImplementedError("recvmsg_into is not supported on this platform")

        trio_socket.SocketType = PatchedSocketType

    except ImportError:
        pass

[A5rocks]

Sorry, I mean import trio before running eventlet.monkey_patch().

[A5rocks]

Ok I thought about this some more and this is totally just an eventlet bug. They claim GreenSocket is "100% api compatible with socket.socket":

https://github.com/eventlet/eventlet/blob/8bac9b2bb5ba02d42305446327a117ff51af177b/eventlet/greenio/base.py#L119-L122