Use all valid routes during blinded path construction #9334

MPins · 2024-12-05T14:57:33Z

MaxNumPaths restriction moved from FindBlindedPaths to BuildBlindedPaymentPaths this way we can interact through all possibly routes.

If the reviewers agreed to this approach we will have to modify the TestFindBlindedPathsWithMC because it is considering that MaxNumPaths retriction is applied on FindBlindedPaths function.

coderabbitai · 2024-12-05T14:57:43Z

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ziggie1984 · 2024-12-07T00:34:31Z

This seems like the simpler solution to implement. Since we’re already querying all routes in FindBlindedPaths, it makes sense to just return them. However, it might be worthwhile to introduce a hard constant cap during the pathfinding process to prevent the array size from growing exponentially. Currently, the algorithm explores all possible paths within the given constraints. Instead, we could stop after finding, say, 100 routes in total, and then apply filtering to select the MaxNumPaths in BuildBlindedPaymentPaths, as proposed in this PR.

Probably the constraints of the Min/Max Hop number prevents these high numbers for routes but I think having a cap is kind of a sanity check.

MPins · 2024-12-09T11:52:30Z

This seems like the simpler solution to implement. Since we’re already querying all routes in FindBlindedPaths, it makes sense to just return them. However, it might be worthwhile to introduce a hard constant cap during the pathfinding process to prevent the array size from growing exponentially. Currently, the algorithm explores all possible paths within the given constraints. Instead, we could stop after finding, say, 100 routes in total, and then apply filtering to select the MaxNumPaths in BuildBlindedPaymentPaths, as proposed in this PR.

Probably the constraints of the Min/Max Hop number prevents these high numbers for routes but I think having a cap is kind of a sanity check.

Before the proposed changes we are querying all routes, sorting the routes based on probability and them capping them based on MaxNumPaths before returning from FindBlindedPaths. After the changes we are capping them just one step later after FindBlindedPaths return them to BuildBlindedPaymentPaths. The hard constant cap should be introduced after the sorting! I might be wrong, but it seems that we are getting too little introducing it!

ziggie1984 · 2024-12-09T12:46:26Z

The hard constant cap should be introduced after the sorting! I might be wrong, but it seems that we are getting too little introducing it!

I think we need to do way more when creating the path rather than creating the path and later checking the probability this does not seem efficient. I think we should build the path in the first place based on probability not just running a depth first search on all available paths. But I am not sure how difficult that might be because we went with the recusrive approach.

MPins · 2024-12-10T13:42:54Z

The hard constant cap should be introduced after the sorting! I might be wrong, but it seems that we are getting too little introducing it!

I think we need to do way more when creating the path rather than creating the path and later checking the probability this does not seem efficient. I think we should build the path in the first place based on probability not just running a depth first search on all available paths. But I am not sure how difficult that might be because we went with the recursive approach.

I think we might compute the total probability and sort the path list during the creation of it (into processNodeForBlindedPath), but I'm not sure it's worth it. What do you think?

ziggie1984 · 2024-12-12T10:09:14Z

yes let's keep it as is and focus only on the underlying issue.

routing/router.go

MaxNumPaths restriction moved from FindBlindedPaths to BuildBlindedPaymentPaths this way we can interact through all possibly routes when creating a new blinded path.

MPins · 2024-12-19T13:30:08Z

Hello @ziggie1984 gently reminder of review 😉

lightninglabs-deploy · 2024-12-26T14:19:25Z

@ziggie1984: review reminder

ziggie1984 · 2024-12-29T08:29:22Z

unit-test fail !

ziggie1984

Looking good I am missing 2 things here:

Can you add some logging stats how many routes are find in total, then how many are filtered out because of the probability as for example debug information. I am very curious whether routes will fail often at the level where the final route and relay information is accumulated.
I tend to introduce a max route variable for the blinded path finding in general, maybe a default of 50 routes, otherwise we look for everything which with a big number of blinded hops might be wasteful.

ziggie1984 · 2024-12-29T08:45:05Z

routing/blindedpath/blinded_path.go

@@ -132,8 +135,11 @@ func BuildBlindedPaymentPaths(cfg *BuildBlindedPathCfg) (
 	paths := make([]*zpay32.BlindedPaymentPath, 0, len(routes))

 	// For each route returned, we will construct the associated blinded
-	// payment path.
+	// payment path, until the maximum number of allowed paths.


of allowed paths is reached.

ziggie1984 · 2024-12-29T08:49:15Z

routing/router_test.go

-		},
-	)
-	require.NoError(t, err)
-	assertPaths(routes, []string{


can we still check here the expected number of paths now

ziggie1984 · 2024-12-29T08:50:13Z

rpcserver.go

@@ -6168,6 +6168,7 @@ func (r *rpcServer) AddInvoice(ctx context.Context,
 				MaxHTLCMsat: 0,
 			},
 			MinNumPathHops: blindingRestrictions.NumHops,
+			MaxNumPaths:    blindingRestrictions.MaxNumPaths,


can you add a unit-test which tests this selection

MPins changed the title ~~route blinding: use all valid routes during path construction iteration instead of the currently capped set by MaxNumPaths~~ Use all valid routes during path construction iteration instead of the currently capped set by MaxNumPaths Dec 5, 2024

MPins changed the title ~~Use all valid routes during path construction iteration instead of the currently capped set by MaxNumPaths~~ use all valid routes during blinded path construction Dec 5, 2024

MPins changed the title ~~use all valid routes during blinded path construction~~ Use all valid routes during blinded path construction Dec 5, 2024

MPins force-pushed the issue-9076 branch from f21292d to bbab1a7 Compare December 5, 2024 15:11

ziggie1984 self-requested a review December 5, 2024 18:06

MPins added 2 commits December 6, 2024 07:50

blindedpath: add the MaxNumPaths restriction on BuildBlindedPaymentPaths

c0d0044

invoicesrpc: included MaxNumPaths to be used on BuildBlindedPaymentPaths

b7741af

MPins force-pushed the issue-9076 branch from bbab1a7 to 12819a2 Compare December 6, 2024 10:50

ziggie1984 reviewed Dec 12, 2024

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routing/router.go Outdated Show resolved Hide resolved

MPins added 3 commits December 13, 2024 06:49

routing: no MaxNumPaths restriction on FindBlindedPaths

e6f8f8d

routing: modify the TestFindBlindedPathsWithMC to not use MaxNumPaths

415eddd

MaxNumPaths restriction moved from FindBlindedPaths to BuildBlindedPaymentPaths this way we can interact through all possibly routes when creating a new blinded path.

lnd: added MaxNumPaths on blindedPathCfg to be used on AddInvoice

cfa17cb

MPins force-pushed the issue-9076 branch from 12819a2 to cfa17cb Compare December 13, 2024 09:50

MPins requested a review from ziggie1984 December 13, 2024 10:31

saubyk assigned MPins Dec 19, 2024

ziggie1984 reviewed Dec 29, 2024

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Use all valid routes during blinded path construction #9334

Use all valid routes during blinded path construction #9334

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Use all valid routes during blinded path construction #9334

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