routing: add source parameter to query routes

This commit allows execution of QueryRoutes from any source node.
Previously this was restricted to only the self node.

routing/pathfind_test.go

@@ -1712,7 +1712,7 @@ func TestPathFindSpecExample(t *testing.T) {
 	carol := ctx.aliases["C"]
 	const amt lnwire.MilliSatoshi = 4999999
 	routes, err := ctx.router.FindRoutes(
-		carol, amt, noRestrictions, 100,
+		bobNode.PubKeyBytes, carol, amt, noRestrictions, 100,
 	)
 	if err != nil {
 		t.Fatalf("unable to find route: %v", err)
@@ -1779,7 +1779,7 @@ func TestPathFindSpecExample(t *testing.T) {
 	// We'll now request a route from A -> B -> C.
 	ctx.router.routeCache = make(map[routeTuple][]*Route)
 	routes, err = ctx.router.FindRoutes(
-		carol, amt, noRestrictions, 100,
+		source.PubKeyBytes, carol, amt, noRestrictions, 100,
 	)
 	if err != nil {
 		t.Fatalf("unable to find routes: %v", err)

routing/router.go

@@ -1325,9 +1325,9 @@ func pathsToFeeSortedRoutes(source Vertex, paths [][]*channeldb.ChannelEdgePolic
 // the required fee and time lock values running backwards along the route. The
 // route that will be ranked the highest is the one with the lowest cumulative
 // fee along the route.
-func (r *ChannelRouter) FindRoutes(target Vertex, amt lnwire.MilliSatoshi, 
-	restrictions *RestrictParams, numPaths uint32, finalExpiry ...uint16) (
-		[]*Route, error) {
+func (r *ChannelRouter) FindRoutes(source, target Vertex,
+	amt lnwire.MilliSatoshi, restrictions *RestrictParams, numPaths uint32,
+	finalExpiry ...uint16) ([]*Route, error) {
 
 	var finalCLTVDelta uint16
 	if len(finalExpiry) == 0 {
@@ -1394,8 +1394,8 @@ func (r *ChannelRouter) FindRoutes(target Vertex, amt lnwire.MilliSatoshi,
 	// we'll execute our KSP algorithm to find the k-shortest paths from
 	// our source to the destination.
 	shortestPaths, err := findPaths(
-		tx, r.cfg.Graph, r.selfNode.PubKeyBytes, target, amt, 
-		restrictions, numPaths, bandwidthHints,
+		tx, r.cfg.Graph, source, target, amt, restrictions,
+		numPaths, bandwidthHints,
 	)
 	if err != nil {
 		tx.Rollback()

routing/router_test.go

@@ -184,6 +184,7 @@ func TestFindRoutesFeeSorting(t *testing.T) {
 	paymentAmt := lnwire.NewMSatFromSatoshis(100)
 	target := ctx.aliases["luoji"]
 	routes, err := ctx.router.FindRoutes(
+		ctx.router.selfNode.PubKeyBytes,
 		target, paymentAmt, noRestrictions, defaultNumRoutes,
 		DefaultFinalCLTVDelta,
 	)
@@ -245,6 +246,7 @@ func TestFindRoutesWithFeeLimit(t *testing.T) {
 	}
 
 	routes, err := ctx.router.FindRoutes(
+		ctx.router.selfNode.PubKeyBytes,
 		target, paymentAmt, restrictions, defaultNumRoutes,
 		DefaultFinalCLTVDelta,
 	)
@@ -1341,6 +1343,7 @@ func TestAddEdgeUnknownVertexes(t *testing.T) {
 	var targetPubKeyBytes Vertex
 	copy(targetPubKeyBytes[:], targetNode.SerializeCompressed())
 	routes, err := ctx.router.FindRoutes(
+		ctx.router.selfNode.PubKeyBytes,
 		targetPubKeyBytes, paymentAmt, noRestrictions, defaultNumRoutes,
 		DefaultFinalCLTVDelta,
 	)
@@ -1386,6 +1389,7 @@ func TestAddEdgeUnknownVertexes(t *testing.T) {
 	// Should still be able to find the routes, and the info should be
 	// updated.
 	routes, err = ctx.router.FindRoutes(
+		ctx.router.selfNode.PubKeyBytes,
 		targetPubKeyBytes, paymentAmt, noRestrictions, defaultNumRoutes,
 		DefaultFinalCLTVDelta,
 	)