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# Copyright (c) 2009, 2010, 2011 Nicira Networks
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import re
import uuid
from ovs.db import error
import ovs.db.parser
class UUID(uuid.UUID):
x = "[0-9a-fA-f]"
uuidRE = re.compile("^(%s{8})-(%s{4})-(%s{4})-(%s{4})-(%s{4})(%s{8})$"
% (x, x, x, x, x, x))
def __init__(self, s):
uuid.UUID.__init__(self, hex=s)
@staticmethod
def zero():
return UUID('00000000-0000-0000-0000-000000000000')
def is_zero(self):
return self.int == 0
@staticmethod
def is_valid_string(s):
return UUID.uuidRE.match(s) != None
@staticmethod
def from_string(s):
if not UUID.is_valid_string(s):
raise error.Error("%s is not a valid UUID" % s)
return UUID(s)
@staticmethod
def from_json(json, symtab=None):
try:
s = ovs.db.parser.unwrap_json(json, "uuid", unicode)
if not UUID.uuidRE.match(s):
raise error.Error("\"%s\" is not a valid UUID" % s, json)
return UUID(s)
except error.Error, e:
if not symtab:
raise e
try:
name = ovs.db.parser.unwrap_json(json, "named-uuid", unicode)
except error.Error:
raise e
if name not in symtab:
symtab[name] = uuid4()
return symtab[name]
def to_json(self):
return ["uuid", str(self)]
def cInitUUID(self, var):
m = UUID.uuidRE.match(str(self))
return ["%s.parts[0] = 0x%s;" % (var, m.group(1)),
"%s.parts[1] = 0x%s%s;" % (var, m.group(2), m.group(3)),
"%s.parts[2] = 0x%s%s;" % (var, m.group(4), m.group(5)),
"%s.parts[3] = 0x%s;" % (var, m.group(6))]
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