add inbound fees channel updates to notifications #8723

bufo24 · 2024-05-03T13:01:03Z

Adds inbound fees to notifications, used in the SubscribeChannelGraph

coderabbitai · 2024-05-03T13:01:11Z

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routing/notifications_test.go

bufo24 · 2024-05-03T17:50:10Z

I got it working, and noticed that here inbound fees are also not added, is this needed?

bitromortac

Thank you a lot for working on this 🔥! I think it may not be necessary to add the inbound fees to ChannelUpdate and ChannelEdgeUpdate because that data is already in the extra tlv data. If we pass through the tlv data instead, we can also make that info available to the stream (see my comment).

bitromortac · 2024-05-06T12:38:33Z

channeldb/models/channel_edge_policy.go

@@ -60,6 +60,15 @@ type ChannelEdgePolicy struct {
 	// HTLCs for each millionth of a satoshi forwarded.
 	FeeProportionalMillionths lnwire.MilliSatoshi

+	// InboundFeeBaseMSat is the base HTLC fee that will be subtracted for


Could you instead add ExtraOpaqueData lnwire.ExtraOpaqueData on this struct and set it in addToTopologyChange? That way we don't have to add redundant data to ChannelUpdate and ChannelEdgeUpdate because the inbound fees are in the opaque tlv blob. We can then use this to pass that blob through to marshalTopologyChange and extract inbound fees using extractInboundFeeSafe. We can then as well set CustomRecords on the proto message preparing it with marshalExtraOpaqueData, similar to the approach that was taken in marshalDBRoutingPolicy.

Roasbeef · 2024-05-07T01:06:56Z

Tests don't build:

Error: routing/notifications_test.go:90:3: unknown field InboundFeeBaseMSat in struct literal of type models.ChannelEdgePolicy
Error: routing/notifications_test.go:91:3: unknown field InboundFeePPM in struct literal of type models.ChannelEdgePolicy
Error: routing/notifications_test.go:516:17: edgeUpdate.InboundBaseFee undefined (type *ChannelEdgeUpdate has no field or method InboundBaseFee)
Error: routing/notifications_test.go:516:43: edgeAnn.InboundFeeBaseMSat undefined (type *models.ChannelEdgePolicy has no field or method InboundFeeBaseMSat)
Error: routing/notifications_test.go:519:13: edgeAnn.InboundFeeBaseMSat undefined (type *models.ChannelEdgePolicy has no field or method InboundFeeBaseMSat)
Error: routing/notifications_test.go:520:16: edgeUpdate.InboundBaseFee undefined (type *ChannelEdgeUpdate has no field or method InboundBaseFee)
Error: routing/notifications_test.go:522:17: edgeUpdate.InboundFeeRate undefined (type *ChannelEdgeUpdate has no field or method InboundFeeRate)
Error: routing/notifications_test.go:522:43: edgeAnn.InboundFeePPM undefined (type *models.ChannelEdgePolicy has no field or method InboundFeePPM)
Error: routing/notifications_test.go:524:36: edgeAnn.InboundFeePPM undefined (type *models.ChannelEdgePolicy has no field or method InboundFeePPM)
Error: routing/notifications_test.go:525:16: edgeUpdate.InboundFeeRate undefined (type *ChannelEdgeUpdate has no field or method InboundFeeRate)
Error: routing/notifications_test.go:525:16: too many errors

The linter is also failing:

TimeLockDelta:           uint32(channelUpdate.TimeLockDelta),
rpcserver.go:6711: line is 86 characters (lll)
				MinHtlc:                 int64(channelUpdate.MinHTLC),
rpcserver.go:6712: line is 87 characters (lll)
				MaxHtlcMsat:             uint64(channelUpdate.MaxHTLC),
rpcserver.go:6713: line is 86 characters (lll)
				FeeBaseMsat:             int64(channelUpdate.BaseFee),
rpcserver.go:6714: line is 86 characters (lll)
				FeeRateMilliMsat:        int64(channelUpdate.FeeRate),
routing/notifications_test.go:5[31](https://github.com/lightningnetwork/lnd/actions/runs/8974797777/job/24647950244?pr=8723#step:7:32): multi-line statement should be followed by a newline (whitespace)
			edgeUpdate.ExtraOpaqueData, edgeAnn.ExtraOpaqueData) {

bufo24 · 2024-05-07T08:18:30Z

Those tests cases should be resolved in my latest commit.
I am not super familiar with Go, what's the best way to resolve these long lines? Which causes the linter to fail

bitromortac

I am not super familiar with Go, what's the best way to resolve these long lines? Which causes the linter to fail

Yes, it takes a bit to get familiar with how some code formatting is done on this repo, I'd recommend to read https://github.com/lightningnetwork/lnd/blob/master/docs/code_contribution_guidelines.md and https://github.com/lightningnetwork/lnd/blob/master/docs/code_formatting_rules.md specifically, it's described there.

Code wise this looks good to me except for the linter issues. Could you also squash your commits?

rpcserver.go

routing/notifications_test.go

bufo24 · 2024-05-07T15:35:34Z

Lint issues resolved and release notes updated. Some integration tests are failing, but are not related to my changes it seems 🤔

guggero

A couple of additional nits, otherwise looks good, thanks.

routing/notifications.go

routing/notifications_test.go

rpcserver.go

docs/release-notes/release-notes-0.18.0.md

guggero

utACK, LGTM 🎉

bitromortac

tACK, LGTM ⚡

Tguntenaar

LGTM

sputn1ck reviewed May 3, 2024

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sputn1ck mentioned this pull request May 3, 2024

[bug]: Inbound fees are not in the gossip message when using subscribeChannelGraph #8722

Closed

bitromortac self-requested a review May 4, 2024 08:56

saubyk added this to the v0.18.0 milestone May 5, 2024

saubyk linked an issue May 5, 2024 that may be closed by this pull request

[bug]: Inbound fees are not in the gossip message when using subscribeChannelGraph #8722

Closed

bufo24 force-pushed the add-inbound-fees-to-channel-notifications branch 2 times, most recently from b851804 to aacb4b6 Compare May 6, 2024 10:24

bufo24 mentioned this pull request May 6, 2024

add inbound fees fields to channel event alexbosworth/lightning#164

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bitromortac reviewed May 6, 2024

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bitromortac reviewed May 7, 2024

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bufo24 force-pushed the add-inbound-fees-to-channel-notifications branch 4 times, most recently from 4034205 to 4e75f30 Compare May 7, 2024 14:05

guggero reviewed May 7, 2024

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feat: add inbound fees to channel notifications

af9858c

bufo24 force-pushed the add-inbound-fees-to-channel-notifications branch from 4ab7641 to af9858c Compare May 7, 2024 16:58

bufo24 requested review from guggero, bitromortac and sputn1ck May 10, 2024 09:01

guggero approved these changes May 10, 2024

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bitromortac approved these changes May 13, 2024

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Roasbeef merged commit 130c499 into lightningnetwork:master May 13, 2024
26 of 27 checks passed

Tguntenaar reviewed May 14, 2024

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add inbound fees channel updates to notifications #8723

add inbound fees channel updates to notifications #8723

bufo24 commented May 3, 2024 •

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add inbound fees channel updates to notifications #8723

add inbound fees channel updates to notifications #8723

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