def verify_vlan_range(vlan_range):
"""Raise an exception for invalid tags or malformed range."""
for vlan_tag in vlan_range:
if not is_valid_vlan_tag(vlan_tag):
raise_invalid_tag(str(vlan_tag), vlan_range)
if vlan_range[1] < vlan_range[0]:
raise n_exc.NetworkVlanRangeError(
vlan_range=vlan_range,
error=_("End of VLAN range is less than start of VLAN range"))
def parse_network_vlan_range(network_vlan_range):
"""Interpret a string as network[:vlan_begin:vlan_end]."""
entry = network_vlan_range.strip()
if ':' in entry:
try:
network, vlan_min, vlan_max = entry.split(':')
vlan_range = (int(vlan_min), int(vlan_max))
except ValueError as ex:
raise n_exc.NetworkVlanRangeError(vlan_range=entry, error=ex)
verify_vlan_range(vlan_range)
return network, vlan_range
else:
return entry, None
def raise_invalid_tag(vlan_str, vlan_range):
"""Raise an exception for invalid tag."""
raise n_exc.NetworkVlanRangeError(vlan_range=vlan_range,
error=_("%s is not a valid VLAN tag") %
vlan_str)
