71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
from collections import defaultdict
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class NoneDict:
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"""Act like None but return a NoneDict for every item request.
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This is similar to the behaviour of collections.defaultdict in that
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even previously inexistent keys can be accessed, but nothing is
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stored permanently in this class.
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"""
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__repr__ = lambda self: 'NoneDict()'
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__bool__ = lambda self: False
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__getitem__ = lambda self, k: NoneDict()
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__json__ = lambda self: None
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__float__ = lambda self: float('NaN')
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def __setitem__(self, key, value):
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raise RuntimeError("NoneDict is readonly")
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class Node(defaultdict):
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_id = None
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def __init__(self, id_=None):
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self._id = id_
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super().__init__(NoneDict)
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def __repr__(self):
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return "Node(%s)" % self.id
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@property
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def id(self):
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return self._id
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def __hash__(self):
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"""Generate hash from the node's id.
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WARNING: Obviously this hash doesn't cover all of the node's
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data, but we need nodes to be hashable in order to eliminate
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duplicates in the NodeDB.
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At least the id cannot change after initialization...
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"""
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return hash(self.id)
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@property
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def vpn_neighbors(self):
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try:
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vpn_neighbors = []
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for neighbor in self['neighbors']:
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if neighbor['neighbor']['vpn']:
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vpn_neighbors.append(neighbor)
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return vpn_neighbors
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except TypeError:
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return []
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def export(self):
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"""Generate a serializable dict of the node.
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In particular, this replaces any references to other nodes by
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their id to prevent circular references.
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"""
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ret = dict(self)
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if "neighbors" in self:
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ret["neighbors"] = []
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for neighbor in self["neighbors"]:
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new_neighbor = {}
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for key, val in neighbor.items():
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if isinstance(val, Node):
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new_neighbor[key] = val.id
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else:
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new_neighbor[key] = val
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ret["neighbors"].append(new_neighbor)
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return ret
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