4f173f37d6
In Python 3 __ne__ by default delegates to __eq__ and inverts the result, but in Python 2 they urge you to define __ne__ when you define __eq__ for it to work properly [1].There are no implied relationships among the comparison operators. The truth of x==y does not imply that x!=y is false. Accordingly, when defining __eq__(), one should also define __ne__() so that the operators will behave as expected. [1]https://docs.python.org/2/reference/datamodel.html#object.__ne__ Change-Id: I5abcaa9d74712df591499e8334f1d627b2d7d1ca
88 lines
2.5 KiB
Python
88 lines
2.5 KiB
Python
"""
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Copyright 2015 Rackspace
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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class ZoneFile(object):
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def __init__(self, origin, ttl, records):
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self.origin = origin
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self.ttl = ttl
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self.records = records
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def __str__(self):
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return str(self.__dict__)
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def __repr__(self):
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return str(self)
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def __eq__(self, other):
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return self.__dict__ == other.__dict__
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def __ne__(self, other):
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return not self.__eq__(other)
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@classmethod
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def from_text(cls, text):
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"""Return a ZoneFile from a string containing the zone file contents"""
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# filter out empty lines and strip all leading/trailing whitespace.
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# this assumes no multiline records
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lines = [x.strip() for x in text.split('\n') if x.strip()]
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assert lines[0].startswith('$ORIGIN')
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assert lines[1].startswith('$TTL')
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return ZoneFile(
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origin=lines[0].split(' ')[1],
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ttl=int(lines[1].split(' ')[1]),
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records=[ZoneFileRecord.from_text(x) for x in lines[2:]],
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)
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class ZoneFileRecord(object):
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def __init__(self, name, type, data):
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self.name = str(name)
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self.type = str(type)
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self.data = str(data)
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def __str__(self):
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return str(self.__dict__)
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def __repr__(self):
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return str(self)
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def __eq__(self, other):
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return self.__dict__ == other.__dict__
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def __ne__(self, other):
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return not self.__eq__(other)
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def __hash__(self):
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return hash(tuple(sorted(self.__dict__.items())))
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@classmethod
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def from_text(cls, text):
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"""Create a ZoneFileRecord from a line of text of a zone file, like:
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mydomain.com. IN NS ns1.example.com.
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"""
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# assumes records don't have a TTL between the name and the class.
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# assumes no parentheses in the record, all on a single line.
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parts = [x for x in text.split(' ', 4) if x.strip()]
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name, rclass, rtype, data = parts
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assert rclass == 'IN'
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return cls(name=name, type=rtype, data=data)
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