Return a connection from the pool using the `ConnectionSelector`
        instance.

        It tries to resurrect eligible connections, forces a resurrection when
        no connections are availible and passes the list of live connections to
        the selector instance to choose from.

        Returns a connection instance and it's current fail count.

def get_connection(self):
        """
        Return a connection from the pool using the `ConnectionSelector`
        instance.

        It tries to resurrect eligible connections, forces a resurrection when
        no connections are availible and passes the list of live connections to
        the selector instance to choose from.

        Returns a connection instance and it's current fail count.
        """
        self.resurrect()
        connections = self.connections[:]

        # no live nodes, resurrect one by force and return it
        if not connections:
            return self.resurrect(True)

        # only call selector if we have a selection
        if len(connections) > 1:
            return self.selector.select(connections)

        # only one connection, no need for a selector
        return connections[0]