lnd.xprv/routing/integrated_routing_test.go

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package routing
import (
"testing"
)
// TestProbabilityExtrapolation tests that probabilities for tried channels are
// extrapolated to untried channels. This is a way to improve pathfinding
// success by steering away from bad nodes.
func TestProbabilityExtrapolation(t *testing.T) {
ctx := newIntegratedRoutingContext(t)
// Create the following network of nodes:
// source -> expensiveNode (charges routing fee) -> target
// source -> intermediate1 (free routing) -> intermediate(1-10) (free routing) -> target
g := ctx.graph
expensiveNode := newMockNode()
expensiveNode.baseFee = 10000
g.addNode(expensiveNode)
g.addChannel(ctx.source, expensiveNode, 100000)
g.addChannel(ctx.target, expensiveNode, 100000)
intermediate1 := newMockNode()
g.addNode(intermediate1)
g.addChannel(ctx.source, intermediate1, 100000)
for i := 0; i < 10; i++ {
imNode := newMockNode()
g.addNode(imNode)
g.addChannel(imNode, ctx.target, 100000)
g.addChannel(imNode, intermediate1, 100000)
// The channels from intermediate1 all have insufficient balance.
g.nodes[intermediate1.pubkey].channels[imNode.pubkey].balance = 0
}
// It is expected that pathfinding will try to explore the routes via
// intermediate1 first, because those are free. But as failures happen,
// the node probability of intermediate1 will go down in favor of the
// paid route via expensiveNode.
//
// The exact number of attempts required is dependent on mission control
// config. For this test, it would have been enough to only assert that
// we are not trying all routes via intermediate1. However, we do assert
// a specific number of attempts to safe-guard against accidental
// modifications anywhere in the chain of components that is involved in
// this test.
ctx.testPayment(5)
// If we use a static value for the node probability (no extrapolation
// of data from other channels), all ten bad channels will be tried
// first before switching to the paid channel.
ctx.mcCfg.AprioriWeight = 1
ctx.testPayment(11)
}