def verify_vlan_range(vlan_range):
"""Verify a VLAN range is valid.
:param vlan_range: An iterable who's 0 index is the min tunnel range
and who's 1 index is the max tunnel range.
:returns: None if the vlan_range is valid.
:raises: NetworkVlanRangeError if vlan_range is not valid.
"""
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 exceptions.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):
"""Parse a well formed network VLAN range string.
The network VLAN range string has the format:
network[:vlan_begin:vlan_end]
:param network_vlan_range: The network VLAN range string to parse.
:returns: A tuple who's 1st element is the network name and 2nd
element is the VLAN range parsed from network_vlan_range.
:raises: NetworkVlanRangeError if network_vlan_range is malformed.
PhysicalNetworkNameError if network_vlan_range is missing a network
name.
"""
entry = network_vlan_range.strip()
if ':' in entry:
if entry.count(':') != 2:
raise exceptions.NetworkVlanRangeError(
vlan_range=entry,
error=_("Need exactly two values for VLAN range"))
network, vlan_min, vlan_max = entry.split(':')
if not network:
raise exceptions.PhysicalNetworkNameError()
try:
vlan_min = int(vlan_min)
except ValueError:
_raise_invalid_tag(vlan_min, entry)
try:
vlan_max = int(vlan_max)
except ValueError:
_raise_invalid_tag(vlan_max, entry)
vlan_range = (vlan_min, vlan_max)
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 exceptions.NetworkVlanRangeError(
vlan_range=vlan_range,
error=_("%s is not a valid VLAN tag") % vlan_str)