gistfile1.py

def _gen_ports(portstr):
    from_port, sep, to_port = portstr.partition('-')
    if not to_port:
        if not sep:
            to_port = from_port
        else:
            # This is an invalid configuration, such as "1-",                                 
            # so the port will be set to 0, which is generally                                
            # not going to be seen as valid.                                                  
            to_port = 0
    return from_port, to_port

def _create_rules(self, secgrp, protocol, ports=[]):
    # hub_cap - Not sure if this error handling should be in its own method or not...
    # I didnt take the time to see its usefulness in teh rest of the file.
    err = inst_models.InstanceTasks.BUILDING_ERROR_SEC_GROUP
    err_msg = ('Error creating security group rules. '
               'Invalid port format. '
               'FromPort = %(from)s, ToPort = %(to)s')

    def set_error_and_raise(ports):
        self.update_db(task_status=err)
        msg = error_msg % {'from': ports[0], 'to': ports[1]}
        raise MalformedSecurityGroupRuleError(msg)

    for port_tuple in map(_gen_ports, ports):
        try:
            port_tuple = map(int, port_tuple)
        except ValueError:
            set_error_and_raise(port_tuple)

        if any([port_tuple[1] > port_tuple[0],
                port_tuple[0] == 0,
                port_tuple[1] == 0]):
            set_error_and_raise(port_tuple)

        SecurityGroupRule.create_sec_group_rule(
            secgrp, protocol,
            port_tuple[0], port_tuple[1],
            CONF.trove_security_group_rule_cidr,
            self.context)