AttributeError :__Enter__ error is throwed when using pyopenssl lib 20.01 version

When creating a secure websocket connection(wss) using websocket create_connection() api call in pyopenssl - openssl/ssl.py (20.0.1), AttributeError: enter error is thrown.

Complete error flow is given below :
line 514, in create_connection
websock.connect(url, **options)
line 226, in connect
self.handshake_response = handshake(self.sock, *addrs, **options)
line 76, in handshake
send(sock, header_str)
line 157, in send
return _send()
line 139, in _send
return sock.send(data)
line 1644, in send
with _from_buffer(buf) as data:
AttributeError: enter

Websocket call flow : websocket.create_connection() -> websock.connect->handshake() -> send(sock, header_str) -> sock.send(data)

Surprisingly, when using 19.1.0 of pyopenssl version, there was no such error observed.

Between these 2 versions, send() method in SSL.py file does not have any changes. surprised to see the error when i execute the test case after the update of library.

with _from_buffer(buf) as data:             
    if len(buf) > 2147483647:                 
        raise ValueError("Cannot send more than 2**31-1 bytes at once.")
    result = _lib.SSL_write(self._ssl, data, len(data))
    self._raise_ssl_error(self._ssl, result)
    return result

[alex]

You’ll need to update to cffi >= 1.12.

[thiyaneshece]

@alex @tiran : Thanks for your feedback. The version cffi -->1.1 is not an explicit version mentioned in requirement.txt file in my py project. However, this version is getting installed due to dependent py module installation, i guess. @alex does cffi version 1.12 is handled to fix the AttributeError: Enter ?