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fix: batchSwap accounting #49

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merged 3 commits into from
Nov 14, 2022
Merged

fix: batchSwap accounting #49

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fad11ca
fix: batchSwap accounting
r0ohafza Nov 10, 2022
403487b
fix: batchSwap accounting
r0ohafza Nov 10, 2022
522ec5b
fix: remove unused import
r0ohafza Nov 14, 2022
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26 changes: 21 additions & 5 deletions src/balancer/BalancerController.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -177,21 +177,34 @@ contract BalancerController is IController {
returns (bool, address[] memory, address[] memory)
{
(
,
IVault.SwapKind kind,
IVault.BatchSwapStep[] memory swaps,
IAsset[] memory assets,
,
,
) = abi.decode(data, (
uint8, IVault.BatchSwapStep[], IAsset[], IVault.FundManagement, uint256[], uint256
IVault.SwapKind,
IVault.BatchSwapStep[],
IAsset[],
IVault.FundManagement,
uint256[],
uint256
)
);

if (!isMultiHopSwap(swaps))
return (false, new address[](0), new address[](0));

uint tokenInIndex = swaps[swaps.length - 1].assetOutIndex;
uint tokenOutIndex = swaps[0].assetInIndex;
uint tokenInIndex;
uint tokenOutIndex;

if (kind == IVault.SwapKind.GIVEN_IN) {
tokenInIndex = swaps[swaps.length - 1].assetOutIndex;
tokenOutIndex = swaps[0].assetInIndex;
} else {
tokenOutIndex = swaps[swaps.length - 1].assetInIndex;
tokenInIndex = swaps[0].assetOutIndex;
}
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address[] memory tokensIn;
address[] memory tokensOut;
Expand Down Expand Up @@ -235,7 +248,10 @@ contract BalancerController is IController {
{
uint steps = swaps.length;
for (uint i; i < steps - 1; i++) {
if (swaps[i].assetOutIndex != swaps[i+1].assetInIndex)
if (
swaps[i].assetOutIndex != swaps[i+1].assetInIndex ||
swaps[i+1].amount > 0
)
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return false;
}
return true;
Expand Down
4 changes: 3 additions & 1 deletion src/balancer/IVault.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ interface IVault {
}

function batchSwap(
uint8 kind,
SwapKind kind,
BatchSwapStep[] memory swaps,
IAsset[] memory assets,
FundManagement memory funds,
Expand All @@ -74,4 +74,6 @@ interface IVault {
uint256 amount;
bytes userData;
}

enum SwapKind { GIVEN_IN, GIVEN_OUT }
}