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fixAMMClawbackRounding: adjust last holder's LPToken balance (#5513)

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Due to rounding, the LPTokenBalance of the last LP might not match the LP's trustline balance. This was fixed for `AMMWithdraw` in `fixAMMv1_1` by adjusting the LPTokenBalance to be the same as the trustline balance. Since `AMMClawback` is also performing a withdrawal, we need to adjust LPTokenBalance as well in `AMMClawback.`

This change includes:
1. Refactored `verifyAndAdjustLPTokenBalance` function in `AMMUtils`, which both`AMMWithdraw` and `AMMClawback` call to adjust LPTokenBalance.
2. Added the unit test `testLastHolderLPTokenBalance` to test the scenario.
3. Modify the existing unit tests for `fixAMMClawbackRounding`.
This commit is contained in:
yinyiqian1
2025-07-11 16:03:28 -04:00
committed by GitHub
parent 258ba71363
commit 8aa94ea09a
6 changed files with 693 additions and 205 deletions
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1
include/xrpl/protocol/detail/features.macro
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@@ -35,6 +35,7 @@
// If you add an amendment here, then do not forget to increment `numFeatures`
// in include/xrpl/protocol/Feature.h.
XRPL_FIX (AMMClawbackRounding, Supported::no, VoteBehavior::DefaultNo)
XRPL_FEATURE(TokenEscrow, Supported::yes, VoteBehavior::DefaultNo)
XRPL_FIX (EnforceNFTokenTrustlineV2, Supported::yes, VoteBehavior::DefaultNo)
XRPL_FIX (AMMv1_3, Supported::yes, VoteBehavior::DefaultNo)