update deps

libs/dns/namedict.py

@@ -0,0 +1,104 @@
+# Copyright (C) 2003-2007, 2009-2011 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"""
+
+import collections
+import dns.name
+from ._compat import xrange
+
+
+class NameDict(collections.MutableMapping):
+
+    """A dictionary whose keys are dns.name.Name objects.
+    @ivar max_depth: the maximum depth of the keys that have ever been
+    added to the dictionary.
+    @type max_depth: int
+    @ivar max_depth_items: the number of items of maximum depth
+    @type max_depth_items: int
+    """
+
+    __slots__ = ["max_depth", "max_depth_items", "__store"]
+
+    def __init__(self, *args, **kwargs):
+        self.__store = dict()
+        self.max_depth = 0
+        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):
+        value = self.__store.pop(key)
+        if len(value) == 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 I{name} in the dictionary.
+
+        The deepest match is the longest name in the dictionary which is
+        a superdomain of I{name}.
+
+        @param name: the name
+        @type name: dns.name.Name object
+        @rtype: (key, value) tuple
+        """
+
+        depth = len(name)
+        if depth > self.max_depth:
+            depth = self.max_depth
+        for i in xrange(-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)