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fix to dust issue on unforced withdrawals under special case #247

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fix to dust issue on unforced withdrawals under special case #247

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9c16ad4
fix to dust issue on unforced withdrawals under special case
dxganta Jan 10, 2023
2206d3e
dust allignments removed from test
dxganta Jan 11, 2023
d26ffa0
fixed tests failing to dust accountancy in the tests
dxganta Jan 11, 2023
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22 changes: 12 additions & 10 deletions contracts/Vault.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -1101,7 +1101,7 @@ contract Vault is
revert VaultCannotWithdrawMoreThanAvailable();

// Amount of shares the _amount is worth
uint256 amountShares = _computeShares(
uint256 sharesToBurn = _computeShares(
_amount,
_totalShares,
_totalUnderlyingMinusSponsored
Expand All @@ -1112,13 +1112,12 @@ contract Vault is
uint256 claimerShares = (_amount * _claim.totalShares) /
_claim.totalPrincipal;

if (!_force && amountShares > claimerShares)
if (!_force && sharesToBurn > claimerShares)
revert VaultMustUseForceWithdrawToAcceptLosses();

uint256 sharesToBurn = amountShares;
bool haircut = sharesToBurn > claimerShares;

if (_force && amountShares > claimerShares)
sharesToBurn = claimerShares;
if (haircut) sharesToBurn = claimerShares;

claimer[_deposit.claimerId].totalShares -= sharesToBurn;
claimer[_deposit.claimerId].totalPrincipal -= _amount;
Expand All @@ -1134,11 +1133,14 @@ contract Vault is
deposits[_tokenId].amount -= _amount;
}

uint256 amount = _computeAmount(
sharesToBurn,
_totalShares,
_totalUnderlyingMinusSponsored
);
uint256 amount = _amount;
if (haircut) {
amount = _computeAmount(
sharesToBurn,
_totalShares,
_totalUnderlyingMinusSponsored
);
}

emit DepositWithdrawn(_tokenId, sharesToBurn, amount, _to, isFull);

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27 changes: 27 additions & 0 deletions test/vault/Vault.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2949,6 +2949,33 @@ describe('Vault', () => {

await vault.connect(admin).exitUnpause();
});

it('leaves no dust on withdraw when force is false', async () => {
const toDeposit = parseUnits('100');
const prevBal = await underlying.balanceOf(alice.address);

const params = depositParams.build({
amount: toDeposit,
inputToken: underlying.address,
claims: [
claimParams.percent(50).to(alice.address).build(),
claimParams.percent(50).to(bob.address).build(),
],
});

await vault.connect(alice).deposit(params);

await moveForwardTwoWeeks();
await addYieldToVault('100');

await vault
.connect(alice)
.partialWithdraw(alice.address, [2], [parseUnits('1')]);

const newBal = await underlying.balanceOf(alice.address);

expect(prevBal.sub(newBal)).to.eq(toDeposit.sub(parseUnits('1')));
});
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Was this test failing without your changes?

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This test because of the subtraction of 1 done in line 2977 to take the dust into account. Similarly many other tests also had a +1 or -1 in the end to account for the dust. This fix, fixes that issue so now we dont have to account for dust in the tests thus also making the tests more readable and simpler. I have made the changes to the tests and they are passing now.

});

describe('claimYield', () => {
Expand Down