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109 lines
3.9 KiB
Python
109 lines
3.9 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2017 Nominum, Inc.
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# Copyright (C) 2016 Coresec Systems AB
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND CORESEC SYSTEMS AB DISCLAIMS ALL
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# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CORESEC
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# SYSTEMS AB BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""DNS name dictionary"""
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import collections
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import dns.name
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from ._compat import xrange
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class NameDict(collections.MutableMapping):
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"""A dictionary whose keys are dns.name.Name objects.
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In addition to being like a regular Python dictionary, this
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dictionary can also get the deepest match for a given key.
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"""
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__slots__ = ["max_depth", "max_depth_items", "__store"]
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def __init__(self, *args, **kwargs):
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super(NameDict, self).__init__()
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self.__store = dict()
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#: the maximum depth of the keys that have ever been added
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self.max_depth = 0
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#: the number of items of maximum depth
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self.max_depth_items = 0
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self.update(dict(*args, **kwargs))
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def __update_max_depth(self, key):
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if len(key) == self.max_depth:
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self.max_depth_items = self.max_depth_items + 1
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elif len(key) > self.max_depth:
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self.max_depth = len(key)
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self.max_depth_items = 1
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def __getitem__(self, key):
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return self.__store[key]
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def __setitem__(self, key, value):
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if not isinstance(key, dns.name.Name):
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raise ValueError('NameDict key must be a name')
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self.__store[key] = value
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self.__update_max_depth(key)
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def __delitem__(self, key):
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value = self.__store.pop(key)
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if len(value) == self.max_depth:
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self.max_depth_items = self.max_depth_items - 1
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if self.max_depth_items == 0:
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self.max_depth = 0
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for k in self.__store:
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self.__update_max_depth(k)
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def __iter__(self):
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return iter(self.__store)
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def __len__(self):
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return len(self.__store)
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def has_key(self, key):
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return key in self.__store
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def get_deepest_match(self, name):
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"""Find the deepest match to *fname* in the dictionary.
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The deepest match is the longest name in the dictionary which is
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a superdomain of *name*. Note that *superdomain* includes matching
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*name* itself.
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*name*, a ``dns.name.Name``, the name to find.
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Returns a ``(key, value)`` where *key* is the deepest
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``dns.name.Name``, and *value* is the value associated with *key*.
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"""
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depth = len(name)
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if depth > self.max_depth:
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depth = self.max_depth
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for i in xrange(-depth, 0):
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n = dns.name.Name(name[i:])
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if n in self:
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return (n, self[n])
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v = self[dns.name.empty]
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return (dns.name.empty, v)
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