436 amm adapter for lfj #437
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| function swap( | ||
| address pool, | ||
| address tokenIn, | ||
| address tokenOut, | ||
| address recipient, | ||
| uint priceImpactTolerance | ||
| ) external { | ||
| ILbPairV2 pair = ILbPairV2(pool); | ||
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| // --------------- token-out balance before swap (to calculate actual amountOut after swap) | ||
| uint balanceBefore = IERC20(tokenOut).balanceOf(recipient); | ||
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| // --------------- verify that provided tokens are correct | ||
| address tokenX = pair.getTokenX(); | ||
| require(_isValid(pair, tokenIn, tokenOut, tokenX), IncorrectTokens()); | ||
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| // --------------- input amount should be sent on balance of the pair contract before swap call | ||
| uint amount = IERC20(tokenIn).balanceOf(address(this)); | ||
| IERC20(tokenIn).safeTransfer(pool, amount); | ||
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| // --------------- ensure that there is enough output amount in the pair | ||
| (uint128 amountInLeft, uint128 price,) = pair.getSwapOut(uint128(amount), tokenIn == tokenX); | ||
| require(amountInLeft == 0, InsufficientOutputAmount(amountInLeft)); | ||
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| // --------------- perform the swap | ||
| pair.swap(tokenX == tokenIn, recipient); | ||
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| // --------------- actual amount out received by the recipient | ||
| uint balanceAfter = IERC20(tokenOut).balanceOf(recipient); | ||
| uint amountOut = balanceAfter > balanceBefore ? balanceAfter - balanceBefore : 0; | ||
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| // --------------- verify that price impact is within the tolerance limit | ||
| uint priceImpact = (price - amountOut) * ConstantsLib.DENOMINATOR / price; | ||
| if (priceImpact >= priceImpactTolerance) { | ||
| revert(string(abi.encodePacked("!PRICE ", Strings.toString(priceImpact)))); | ||
| } | ||
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| emit SwapInPool(pool, tokenIn, tokenOut, recipient, priceImpactTolerance, amount, amountOut); | ||
| } |
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| function swap( | ||
| address pool, | ||
| address tokenIn, | ||
| address tokenOut, | ||
| address recipient, | ||
| uint priceImpactTolerance | ||
| ) external { | ||
| ILbPairV2 pair = ILbPairV2(pool); | ||
|
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| // --------------- token-out balance before swap (to calculate actual amountOut after swap) | ||
| uint balanceBefore = IERC20(tokenOut).balanceOf(recipient); | ||
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| // --------------- verify that provided tokens are correct | ||
| address tokenX = pair.getTokenX(); | ||
| require(_isValid(pair, tokenIn, tokenOut, tokenX), IncorrectTokens()); | ||
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| // --------------- input amount should be sent on balance of the pair contract before swap call | ||
| uint amount = IERC20(tokenIn).balanceOf(address(this)); | ||
| IERC20(tokenIn).safeTransfer(pool, amount); | ||
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| // --------------- ensure that there is enough output amount in the pair | ||
| (uint128 amountInLeft, uint128 price,) = pair.getSwapOut(uint128(amount), tokenIn == tokenX); | ||
| require(amountInLeft == 0, InsufficientOutputAmount(amountInLeft)); | ||
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| // --------------- perform the swap | ||
| pair.swap(tokenX == tokenIn, recipient); | ||
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| // --------------- actual amount out received by the recipient | ||
| uint balanceAfter = IERC20(tokenOut).balanceOf(recipient); | ||
| uint amountOut = balanceAfter > balanceBefore ? balanceAfter - balanceBefore : 0; | ||
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| // --------------- verify that price impact is within the tolerance limit | ||
| uint priceImpact = (price - amountOut) * ConstantsLib.DENOMINATOR / price; | ||
| if (priceImpact >= priceImpactTolerance) { | ||
| revert(string(abi.encodePacked("!PRICE ", Strings.toString(priceImpact)))); | ||
| } | ||
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| emit SwapInPool(pool, tokenIn, tokenOut, recipient, priceImpactTolerance, amount, amountOut); | ||
| } |
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Unused return Medium
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| function swap( | ||
| address pool, | ||
| address tokenIn, | ||
| address tokenOut, | ||
| address recipient, | ||
| uint priceImpactTolerance | ||
| ) external { | ||
| ILbPairV2 pair = ILbPairV2(pool); | ||
|
|
||
| // --------------- token-out balance before swap (to calculate actual amountOut after swap) | ||
| uint balanceBefore = IERC20(tokenOut).balanceOf(recipient); | ||
|
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| // --------------- verify that provided tokens are correct | ||
| address tokenX = pair.getTokenX(); | ||
| require(_isValid(pair, tokenIn, tokenOut, tokenX), IncorrectTokens()); | ||
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| // --------------- input amount should be sent on balance of the pair contract before swap call | ||
| uint amount = IERC20(tokenIn).balanceOf(address(this)); | ||
| IERC20(tokenIn).safeTransfer(pool, amount); | ||
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| // --------------- ensure that there is enough output amount in the pair | ||
| (uint128 amountInLeft, uint128 price,) = pair.getSwapOut(uint128(amount), tokenIn == tokenX); | ||
| require(amountInLeft == 0, InsufficientOutputAmount(amountInLeft)); | ||
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| // --------------- perform the swap | ||
| pair.swap(tokenX == tokenIn, recipient); | ||
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| // --------------- actual amount out received by the recipient | ||
| uint balanceAfter = IERC20(tokenOut).balanceOf(recipient); | ||
| uint amountOut = balanceAfter > balanceBefore ? balanceAfter - balanceBefore : 0; | ||
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| // --------------- verify that price impact is within the tolerance limit | ||
| uint priceImpact = (price - amountOut) * ConstantsLib.DENOMINATOR / price; | ||
| if (priceImpact >= priceImpactTolerance) { | ||
| revert(string(abi.encodePacked("!PRICE ", Strings.toString(priceImpact)))); | ||
| } | ||
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| emit SwapInPool(pool, tokenIn, tokenOut, recipient, priceImpactTolerance, amount, amountOut); | ||
| } |
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Unused return Medium
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| function getPrice(address pool, address tokenIn, address tokenOut, uint amount) public view returns (uint price) { | ||
| address tokenX = ILbPairV2(pool).getTokenX(); | ||
| if (_isValid(ILbPairV2(pool), tokenIn, tokenOut, tokenX)) { | ||
| if (amount == 0) { | ||
| amount = 10 ** IERC20Metadata(tokenIn).decimals(); | ||
| } | ||
| (uint128 amountInLeft, uint128 amountOut,) = ILbPairV2(pool).getSwapOut(uint128(amount), tokenIn == tokenX); | ||
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| // todo how to handle following case without reverting? | ||
| require(amountInLeft == 0, InsufficientOutputAmount(amountInLeft)); | ||
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| price = amountOut; | ||
| } | ||
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| return price; | ||
| } |
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Unused return Medium
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