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Edit File : namedict.py \| Size : 3.91 KB
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license # Copyright (C) 2003-2017 Nominum, Inc. # Copyright (C) 2016 Coresec Systems AB # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. # # THE SOFTWARE IS PROVIDED "AS IS" AND CORESEC SYSTEMS AB DISCLAIMS ALL # WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED # WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CORESEC # SYSTEMS AB BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR # CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS # OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, # NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION # WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """DNS name dictionary""" # pylint seems to be confused about this one! from collections.abc import MutableMapping # pylint: disable=no-name-in-module import dns.name class NameDict(MutableMapping): """A dictionary whose keys are dns.name.Name objects. In addition to being like a regular Python dictionary, this dictionary can also get the deepest match for a given key. """ __slots__ = ["max_depth", "max_depth_items", "__store"] def __init__(self, args, kwargs): super().__init__() self.__store = dict() #: the maximum depth of the keys that have ever been added self.max_depth = 0 #: the number of items of maximum depth self.max_depth_items = 0 self.update(dict(args, *kwargs)) def __update_max_depth(self, key): if len(key) == self.max_depth: self.max_depth_items = self.max_depth_items + 1 elif len(key) > self.max_depth: self.max_depth = len(key) self.max_depth_items = 1 def __getitem__(self, key): return self.__store[key] def __setitem__(self, key, value): if not isinstance(key, dns.name.Name): raise ValueError("NameDict key must be a name") self.__store[key] = value self.__update_max_depth(key) def __delitem__(self, key): self.__store.pop(key) if len(key) == self.max_depth: self.max_depth_items = self.max_depth_items - 1 if self.max_depth_items == 0: self.max_depth = 0 for k in self.__store: self.__update_max_depth(k) def __iter__(self): return iter(self.__store) def __len__(self): return len(self.__store) def has_key(self, key): return key in self.__store def get_deepest_match(self, name): """Find the deepest match to name* in the dictionary. The deepest match is the longest name in the dictionary which is a superdomain of name. Note that superdomain includes matching name itself. name, a ``dns.name.Name``, the name to find. Returns a ``(key, value)`` where key is the deepest ``dns.name.Name``, and value is the value associated with key. """ depth = len(name) if depth > self.max_depth: depth = self.max_depth for i in range(-depth, 0): n = dns.name.Name(name[i:]) if n in self: return (n, self[n]) v = self[dns.name.empty] return (dns.name.empty, v) Back

Edit File : namedict.py | Size : 3.91 KB

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2003-2017 Nominum, Inc.
# Copyright (C) 2016 Coresec Systems AB
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND CORESEC SYSTEMS AB DISCLAIMS ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CORESEC
# SYSTEMS AB BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""DNS name dictionary"""

# pylint seems to be confused about this one!
from collections.abc import MutableMapping  # pylint: disable=no-name-in-module

import dns.name

class NameDict(MutableMapping):
    """A dictionary whose keys are dns.name.Name objects.

In addition to being like a regular Python dictionary, this
    dictionary can also get the deepest match for a given key.
    """

__slots__ = ["max_depth", "max_depth_items", "__store"]

def __init__(self, *args, **kwargs):
        super().__init__()
        self.__store = dict()
        #: the maximum depth of the keys that have ever been added
        self.max_depth = 0
        #: the number of items of maximum depth
        self.max_depth_items = 0
        self.update(dict(*args, **kwargs))

def __update_max_depth(self, key):
        if len(key) == self.max_depth:
            self.max_depth_items = self.max_depth_items + 1
        elif len(key) > self.max_depth:
            self.max_depth = len(key)
            self.max_depth_items = 1

def __getitem__(self, key):
        return self.__store[key]

def __setitem__(self, key, value):
        if not isinstance(key, dns.name.Name):
            raise ValueError("NameDict key must be a name")
        self.__store[key] = value
        self.__update_max_depth(key)

def __delitem__(self, key):
        self.__store.pop(key)
        if len(key) == self.max_depth:
            self.max_depth_items = self.max_depth_items - 1
        if self.max_depth_items == 0:
            self.max_depth = 0
            for k in self.__store:
                self.__update_max_depth(k)

def __iter__(self):
        return iter(self.__store)

def __len__(self):
        return len(self.__store)

def has_key(self, key):
        return key in self.__store

def get_deepest_match(self, name):
        """Find the deepest match to *name* in the dictionary.

The deepest match is the longest name in the dictionary which is
        a superdomain of *name*.  Note that *superdomain* includes matching
        *name* itself.

*name*, a ``dns.name.Name``, the name to find.

Returns a ``(key, value)`` where *key* is the deepest
        ``dns.name.Name``, and *value* is the value associated with *key*.
        """

depth = len(name)
        if depth > self.max_depth:
            depth = self.max_depth
        for i in range(-depth, 0):
            n = dns.name.Name(name[i:])
            if n in self:
                return (n, self[n])
        v = self[dns.name.empty]
        return (dns.name.empty, v)

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