Implement anchor outputs zero fee htlc txs #1932
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Codecov Report
@@ Coverage Diff @@
## master #1932 +/- ##
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- Coverage 87.66% 87.63% -0.03%
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Files 159 159
Lines 12424 12438 +14
Branches 527 519 -8
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+ Hits 10891 10900 +9
- Misses 1533 1538 +5
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eclair-core/src/main/scala/fr/acinq/eclair/blockchain/fee/FeeEstimator.scala
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eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelFeatures.scala
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eclair-core/src/main/scala/fr/acinq/eclair/transactions/CommitmentSpec.scala
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eclair-core/src/main/scala/fr/acinq/eclair/channel/publish/ReplaceableTxPublisher.scala
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Create the corresponding feature bit and channel type. Ensure it can be correctly negotiated and propagated to the channel commitments.
When the channel type is anchor outputs with zero fee htlc txs, we set the fees for the htlc txs to 0. An important side-effect is that it changes the trimmed to dust calculation, and outputs that were previously dust can now be included in the commit tx.
It makes sense to decouple the transaction code that doesn't need to know anything about the channel type, but only the format of the transactions that should be built.
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Implement lightning/bolts#824
This is a small variation of the original anchor outputs proposal, where the fees of the htlc 2nd-stage txs are set to 0 to fix a fee inflating attack when you're fundee (see https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-September/002796.html for details).
The first commit creates the corresponding feature bit and lets peers negotiate its activation.
The second commit actually sets the htlc txs fee to 0 when this new channel type is negotiated.
I've tested cross-compatibility with lnd 0.13.1-beta (their latest release).
I verified that we were able to open channels and send payments to each other.
I also verified that HTLCs that were exactly at the dust limit were included in the commit tx (so the trimmed to dust calculation is compatible and correctly uses a 0-fee htlc tx) and htlcs just below the dust limit were not included in the commit tx.