[issue25593] _sock_connect_cb can be called twice resulting in InvalidStateError

[Alexander Mohr]

Alexander Mohr added the comment:

clarification, adding the fut.done() check, or monkey patching:
orig_sock_connect_cb = 
asyncio.selector_events.BaseSelectorEventLoop._sock_connect_cb
def _sock_connect_cb(self, fut, sock, address):
    if fut.done(): return
    return orig_sock_connect_cb(self, fut, sock, address)

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<http://bugs.python.org/issue25593>
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