// Restart a node
func (m *Model) restart(node *TestNode) {
node.Node = NewNode(router.PeerName(m.nextID),
router.PeerUID(m.r.Int63()), m.quorum)
m.nextID++
node.Propose()
// The node is now ignorant, so we need to mark the links into
// the node as ready.
for _, l := range node.links {
if !l.to.isolated {
m.readyLink(l.converse)
}
}
// If a consensus was just accepted due to this node accepting
// it, without other nodes hearing of it, and we then restart
// this node, then a different consensus can occur later on.
// If a tree falls with no one to hear it, does it make a
// sound?
node.firstConsensus = AcceptedValue{}
}
// Make a network of nodes with random topology
func makeRandomModel(params *TestParams, r *rand.Rand, t *testing.T) *Model {
m := Model{
t: t,
r: r,
quorum: params.nodeCount/2 + 1,
nodes: make([]TestNode, params.nodeCount),
readyLinks: []*Link{},
nextID: params.nodeCount + 1,
}
for i := range m.nodes {
m.nodes[i].Node = NewNode(router.PeerName(i/2+1),
router.PeerUID(r.Int63()), m.quorum)
m.nodes[i].Propose()
}
for i := 1; i < len(m.nodes); i++ {
// was node i connected to the other nodes yet?
connected := false
for j := 0; j < i; j++ {
if r.Float32() < params.connectedProb {
connected = true
m.addLink(&m.nodes[i], &m.nodes[j])
}
}
if !connected {
// node i must be connected into the graph
// somewhere. So if we didn't connect it
// already, this is a last resort.
m.addLink(&m.nodes[i], &m.nodes[r.Intn(i)])
}
}
return &m
}