cmd/commands: add validation for MPP parameters #9238

anibilthare · 2024-10-31T05:45:17Z

Fixes 8916

Change Description

Adds validation to ensure that the combination of max_parts and max_shard_size_msat parameters can accommodate the full payment amount before attempting the payment. This prevents payments from entering a path finding loop that would eventually timeout when parameters are incompatible.

Steps to Test

coderabbitai · 2024-10-31T05:45:24Z

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ellemouton

Thanks for the contribution @anibilthare 🙏

I think this validation should be the routerrpc though so that it can be applied no matter the interface being used :)

ellemouton · 2024-10-31T05:55:12Z

cmd/commands/cmd_payments.go

+	// Validate maxShardSize
+	if maxShardSize <= 0 {
+		return fmt.Errorf("max_shard_size must be positive, got %v", maxShardSize)
+	}
+
+	// Validate maxParts
+	if maxParts <= 0 {
+		return fmt.Errorf("max_parts must be positive, got %v", maxParts)
+	}


these are both unsigned integers. So they cannot be negative

also note that we treat 0 for maxParts as just the "default" which will later be replaced by 16. So 0 does not mean that MPP is not being used. Only not setting maxShardSize (ie, leaving it at 0) results in MPP not being used.

ellemouton · 2024-10-31T06:03:48Z

cmd/commands/cmd_payments.go

+		if err != nil {
+			return status.Errorf(codes.InvalidArgument,
+				"invalid MPP parameters: %v", err)
+		}


note that this only applies validation if used via the CLI. I think we want the validation to apply regardless of how SendPayment is being called. I think a better place for this validation is thus here:

lnd/lnrpc/routerrpc/router_backend.go

Lines 851 to 867 in 684041b

// Attempt to parse the max parts value set by the user, if this value

// isn't set, then we'll use the current default value for this

// setting.

maxParts := rpcPayReq.MaxParts

if maxParts == 0 {

maxParts = DefaultMaxParts

}

payIntent.MaxParts = maxParts

// If this payment had a max shard amount specified, then we'll apply

// that now, which'll force us to always make payment splits smaller

// than this.

if rpcPayReq.MaxShardSizeMsat > 0 {

shardAmtMsat := lnwire.MilliSatoshi(rpcPayReq.MaxShardSizeMsat)

payIntent.MaxShardAmt = &shardAmtMsat

}

Adds validation to ensure that the combination of max_parts and max_shard_size_msat parameters can accommodate the full payment amount before attempting the payment. This prevents payments from entering a path finding loop that would eventually timeout when parameters are incompatible.

anibilthare · 2024-11-01T06:28:30Z

Thanks @ellemouton !

Done

ellemouton

thanks @anibilthare 🙏

note that the commit title is now out of date. Also, see the failing linter CI check & missing release notes check

ellemouton · 2024-11-01T07:06:25Z

lnrpc/routerrpc/router_backend.go

+// payment amount. It returns an error if the parameters don't allow the full
+// payment amount to be sent.
+// maybeValidateMPPParams could be enhanced with additional checks
+func maybeValidateMPPParams(amt lnwire.MilliSatoshi, maxParts uint32,


i think you can just call it validateMPPParams

also, i think it may be worth adding a test for this. Perhaps there is an itest we can expand on just to make sure the call to SendPaymentV2 fails as expected

ellemouton · 2024-11-01T07:07:38Z

lnrpc/routerrpc/router_backend.go

@@ -1174,7 +1198,11 @@ func (r *RouterBackend) extractIntentFromSendRequest(

 		payIntent.DestFeatures = features
 	}
-
+	err = maybeValidateMPPParams(
+		payIntent.Amount, maxParts, lnwire.MilliSatoshi(rpcPayReq.MaxShardSizeMsat))


nit: formatting

ellemouton · 2024-11-01T07:07:46Z

lnrpc/routerrpc/router_backend.go

+	err = maybeValidateMPPParams(
+		payIntent.Amount, maxParts, lnwire.MilliSatoshi(rpcPayReq.MaxShardSizeMsat))
+	if err != nil {
+		return nil, fmt.Errorf("invalid MPP parameters: %v", err)


ellemouton · 2024-11-01T07:09:14Z

lnrpc/routerrpc/router_backend.go

+// maybeValidateMPPParams validates that the MPP parameters are compatible with the
+// payment amount. It returns an error if the parameters don't allow the full
+// payment amount to be sent.
+// maybeValidateMPPParams could be enhanced with additional checks


i dont think we need this last line. Validation functions can always be enhanced - this is implied

lightninglabs-deploy · 2024-11-22T08:41:06Z

@anibilthare, remember to re-request review from reviewers when ready

ellemouton self-requested a review October 31, 2024 05:50

ellemouton requested changes Oct 31, 2024

View reviewed changes

anibilthare force-pushed the issue_8916_invalid_mpp_params branch from d630dcc to 2de5713 Compare November 1, 2024 06:27

ellemouton reviewed Nov 1, 2024

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cmd/commands: add validation for MPP parameters #9238

cmd/commands: add validation for MPP parameters #9238

anibilthare commented Oct 31, 2024 •

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lightninglabs-deploy commented Nov 22, 2024


	// Attempt to parse the max parts value set by the user, if this value
	// isn't set, then we'll use the current default value for this
	// setting.
	maxParts := rpcPayReq.MaxParts
	if maxParts == 0 {
	maxParts = DefaultMaxParts
	}
	payIntent.MaxParts = maxParts

	// If this payment had a max shard amount specified, then we'll apply
	// that now, which'll force us to always make payment splits smaller
	// than this.
	if rpcPayReq.MaxShardSizeMsat > 0 {
	shardAmtMsat := lnwire.MilliSatoshi(rpcPayReq.MaxShardSizeMsat)
	payIntent.MaxShardAmt = &shardAmtMsat
	}

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anibilthare commented Oct 31, 2024 • edited Loading

Change Description

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