def do_handshake(self):
"""Perform a TLS/SSL handshake."""
while True:
try:
return self._sslobj.do_handshake()
except SSLError:
ex = sys.exc_info()[1]
if ex.args[0] == SSL_ERROR_WANT_READ:
if self.timeout == 0.0:
raise
sys.exc_clear()
self._wait(self._read_event, timeout_exc=_SSLErrorHandshakeTimeout)
elif ex.args[0] == SSL_ERROR_WANT_WRITE:
if self.timeout == 0.0:
raise
sys.exc_clear()
self._wait(self._write_event, timeout_exc=_SSLErrorHandshakeTimeout)
else:
raise
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