Skipper-go Solidity Contract Gas Optimization #23
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jim380
commented
Apr 10, 2023
| @@ -20,6 +20,10 @@ contract Multihop is Ownable { | |||
| uint256 fee; | |||
| } | |||
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| // --------------------- Errors -------------------- // | |||
| @@ -35,7 +39,7 @@ contract Multihop is Ownable { | |||
| function swapMultihop( | |||
| address fromToken, | |||
| uint256 fromAmount, | |||
| DexHop[] memory route | |||
| DexHop[] calldata route | |||
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route is not mutated in the function body so using calldata would save some gas.
| @@ -48,24 +52,27 @@ contract Multihop is Ownable { | |||
| IERC20(fromToken).transfer(route[0].pairAddress, fromAmount); | |||
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| // Loop through the route and execute the trades | |||
| for (uint256 i = 0; i < route.length; i++) { | |||
| DexHop memory hop = route[i]; | |||
| uint256 length = route.length; | |||
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Caching array length to avoid repeatedly loading from the state in each iteration.
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| (bool success, ) = owner().call{value: balance}(""); | ||
| if (!success) revert WithdrawNativeBalanceFailed(); |
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.transfer has a hardcoded 2300 gas limit which prevents smart contracts from doing things like sending ether to a gnosis safe due to out of gas. .call instead forwards all gas and is now the recommended way to send ether from a contract. It's also reentrancy safe here since the function is only accessible by the owner.
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A few gas optimizations that I nitpicked while checking out the codebase: