def LoadPorts()

in container_agent/run_containers.py [0:0]
51 lines of code
12 McCabe index (conditional complexity)

def LoadPorts(ports_spec, ctr_name):
    """Process a "ports" block of config and return a list of ports."""

    # TODO(thockin): could be a dict of name -> Port
    all_ports = []
    all_port_names = []
    all_host_port_mappings = set()

    for port_index, port_spec in enumerate(ports_spec):
        if 'name' in port_spec:
            port_name = port_spec['name']
            if not IsRfc1035Name(port_name):
                raise ConfigException(
                    'containers[%s].ports[%d].name is invalid: %s'
                    % (ctr_name, port_index, port_name))
            if port_name in all_port_names:
                raise ConfigException(
                    'containers[%s].ports[%d].name is not unique: %s'
                    % (ctr_name, port_index, port_name))
            all_port_names.append(port_name)
        else:
            port_name = str(port_index)

        if 'containerPort' not in port_spec:
            raise ConfigException(
                'containers[%s].ports[%s] has no containerPort'
                % (ctr_name, port_name))
        ctr_port = port_spec['containerPort']
        if not IsValidPort(ctr_port):
            raise ConfigException(
                'containers[%s].ports[%s].containerPort is invalid: %d'
                % (ctr_name, port_name, ctr_port))

        host_ip = port_spec.get('hostIp', '')
        if host_ip and not IsValidIpv4Address(host_ip):
            raise ConfigException(
                'containers[%s].ports[%s].hostIp is invalid: %s'
                % (ctr_name, port_name, host_ip))

        host_port = port_spec.get('hostPort', ctr_port)
        if not IsValidPort(host_port):
            raise ConfigException(
                'containers[%s].ports[%s].hostPort is invalid: %d'
                % (ctr_name, port_name, host_port))

        proto = port_spec.get('protocol', 'TCP')
        if not IsValidProtocol(proto):
            raise ConfigException(
                'containers[%s].ports[%s].protocol is invalid: %s'
                % (ctr_name, port_name, proto))

        host_port_mapping = (host_ip, host_port, proto)
        if host_port_mapping in all_host_port_mappings:
            raise ConfigException(
                'containers[%s].ports[%s].(hostIp,hostPort,protocol) \
                is not unique: %s %d %s'
                % (ctr_name, port_name, host_ip, host_port, proto))
        all_host_port_mappings.add(host_port_mapping)

        all_ports.append((host_ip, host_port, ctr_port, ProtocolString(proto)))

    return all_ports