Implement the two types of costs in TopologyV3

birdvisu/topo_v3.py

@@ -205,6 +205,10 @@ class Vertex:
 	outgoing_edges: set['Edge'] = field(default_factory=set)
 	incoming_edges: set['Edge'] = field(default_factory=set)
 
+class MetricType(IntEnum):
+	Type1 = 1
+	Type2 = 2
+
 @dataclass(frozen=True)
 class Edge:
 	"""An edge of the topology.
@@ -220,6 +224,8 @@ class Edge:
 	cost: int
 	# The network is a multigraph, so we need to know how many times to count this edge
 	count: int
+	# Oh how much I would love to have this near the cost, but dataclasses said No!
+	metric_type: MetricType = MetricType.Type1
 	# Virtual links are basically an implementation detail of OSPF.
 	# Nonetheless, it might be useful to be able to show them, so we allow
 	# adding them to a topology.