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multi: cap anchors feerate at configurable maximum

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This commit caps the update fee the initiator will send when the anchors
channel type is used. We do not limit anything on the receiver side.

10 sat/vbyte is the current default max fee rate we use. This should be
enough to ensure propagation before anchoring down the commitment
transaction.
This commit is contained in:
Johan T. Halseth
2020-12-10 14:16:53 +01:00
parent d289a6ff78
commit 0fd76e53b8
9 changed files with 106 additions and 27 deletions
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5
lnwallet/commitment.go
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@@ -17,6 +17,11 @@ import (
// anchorSize is the constant anchor output size.
const anchorSize = btcutil.Amount(330)
// DefaultAnchorsCommitMaxFeeRateSatPerVByte is the default max fee rate in
// sat/vbyte the initiator will use for anchor channels. This should be enough
// to ensure propagation before anchoring down the commitment transaction.
const DefaultAnchorsCommitMaxFeeRateSatPerVByte = 10
// CommitmentKeyRing holds all derived keys needed to construct commitment and
// HTLC transactions. The keys are derived differently depending whether the
// commitment transaction is ours or the remote peer's. Private keys associated