+
+
+class UnexpectedPacketError(Exception):
+ def __init__(self, packet, msg=""):
+ self.packet = packet
+ self.msg = msg
+
+ def __str__(self):
+ return f"\nUnexpected packet:\n{pr(self.packet)}{self.msg}"
+
+
+def recursive_dict_merge(dict_base, dict_update):
+ """Recursively merge base dict with update dict, return merged dict"""
+ for key in dict_update:
+ if key in dict_base:
+ if type(dict_update[key]) is dict:
+ dict_base[key] = recursive_dict_merge(dict_base[key], dict_update[key])
+ else:
+ dict_base[key] = dict_update[key]
+ else:
+ dict_base[key] = dict_update[key]
+ return dict_base
+
+
+class StatsDiff(UserDict):
+ """
+ Diff dictionary is a dictionary of dictionaries of interesting stats:
+
+ diff_dictionary =
+ {
+ "err" : { '/error/counter1' : 4, },
+ sw_if_index1 : { '/stat/segment/counter1' : 5,
+ '/stat/segment/counter2' : 6,
+ },
+ sw_if_index2 : { '/stat/segment/counter1' : 7,
+ },
+ }
+
+ It describes a per sw-if-index diffset, where each key is stat segment
+ path and value is the expected change for that counter for sw-if-index.
+ Special case string "err" is used for error counters, which are not per
+ sw-if-index.
+ """
+
+ __slots__ = () # prevent setting properties to act like a dictionary
+
+ def __init__(self, data):
+ super().__init__(data)
+
+ def __or__(self, other):
+ return recursive_dict_merge(deepcopy(self.data), other)