add simple gossipsub error model

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>

DAS/simulator.py

@@ -129,6 +129,8 @@ class Simulator:
             if not nx.is_connected(G):
                 self.logger.error("Graph not connected for row %d !" % id, extra=self.format)
             for u, v in G.edges:
+                if (random.randint(0,99) < self.config.gsEdgeFailureRate):
+                    continue
                 val1=rowChannels[id][u]
                 val2=rowChannels[id][v]
                 val1.rowNeighbors[id].update({val2.ID : Neighbor(val2, 0, self.shape.blockSize)})
@@ -145,6 +147,8 @@ class Simulator:
             if not nx.is_connected(G):
                 self.logger.error("Graph not connected for column %d !" % id, extra=self.format)
             for u, v in G.edges:
+                if (random.randint(0,99) < self.config.gsEdgeFailureRate):
+                    continue
                 val1=columnChannels[id][u]
                 val2=columnChannels[id][v]
                 val1.columnNeighbors[id].update({val2.ID : Neighbor(val2, 1, self.shape.blockSize)})

config_example.py

@@ -48,6 +48,9 @@ blockSizes = range(32,65,16)
 # Per-topic mesh neighborhood size
 netDegrees = range(6, 9, 2)
 
+# percentage of GossipSub mesh link failures
+gsEdgeFailureRate = 0
+
 # number of rows and columns a validator is interested in
 chis = range(2, 5, 2)