def add_connection(self):
        """
        Convenience function to connect and store the resulting
        connector.
        """
        if self.ssl_options:

            if not _HAS_SSL:
                raise ImportError(
                    str(e) +
                    ', pyOpenSSL must be installed to enable SSL support with the Twisted event loop'
                )

            self.connector = reactor.connectSSL(
                host=self.endpoint.address, port=self.port,
                factory=TwistedConnectionClientFactory(self),
                contextFactory=_SSLContextFactory(self.ssl_options, self._check_hostname, self.endpoint.address),
                timeout=self.connect_timeout)
        else:
            self.connector = reactor.connectTCP(
                host=self.endpoint.address, port=self.port,
                factory=TwistedConnectionClientFactory(self),
                timeout=self.connect_timeout)
Convenience function to connect and store the resulting
        connector.