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multi: replace DefaultDustLimit with script-specific DustLimitForSize

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This commit updates call-sites to use the proper dust limits for
various script types. This also updates the default dust limit used
in the funding flow to be 354 satoshis instead of 573 satoshis.
This commit is contained in:
eugene
2021-09-23 15:40:37 -04:00
parent 3385d38414
commit fdcd726f9a
27 changed files with 330 additions and 154 deletions
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15
watchtower/wtpolicy/policy.go
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@@ -6,6 +6,7 @@ import (
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/input"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwallet/chainfee"
"github.com/lightningnetwork/lnd/watchtower/blob"
@@ -165,10 +166,9 @@ func (p *Policy) ComputeAltruistOutput(totalAmt btcutil.Amount,
sweepAmt := totalAmt - txFee
// TODO(conner): replace w/ configurable dust limit
dustLimit := lnwallet.DefaultDustLimit()
// Check that the created outputs won't be dusty.
if sweepAmt <= dustLimit {
// Check that the created outputs won't be dusty. The sweep pkscript is
// currently a p2wpkh, so we'll use that script's dust limit.
if sweepAmt < lnwallet.DustLimitForSize(input.P2WPKHSize) {
return 0, ErrCreatesDust
}
@@ -199,10 +199,9 @@ func (p *Policy) ComputeRewardOutputs(totalAmt btcutil.Amount,
sweepAmt := totalAmt - rewardAmt - txFee
// TODO(conner): replace w/ configurable dust limit
dustLimit := lnwallet.DefaultDustLimit()
// Check that the created outputs won't be dusty.
if sweepAmt <= dustLimit {
// Check that the created outputs won't be dusty. The sweep pkscript is
// currently a p2wpkh, so we'll use that script's dust limit.
if sweepAmt < lnwallet.DustLimitForSize(input.P2WPKHSize) {
return 0, 0, ErrCreatesDust
}