def ex_open_vnc_tunnel(self, node):
        path = '/servers/%s/action/' % (node.id)
        response = self._perform_action(path=path, action='open_vnc',
                                        method='POST').object
        vnc_url = response['vnc_url']
        return vnc_url
Virtual method meant to be overridden by the subclass
dataset/ETHPy150Open apache/libcloud/libcloud/compute/drivers/cloudsigma.py/CloudSigma_2_0_NodeDriver.ex_open_vnc_tunnel--crossover with--dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/VolumeProbe/VolumeProbe.py/ViewWatcher.tearDown