Any solidity meatheads around? ;)

Siff · Jun 15, 2024

Hoping someone has more of a clue what's going on - I have been playing around with parsing json in foundry but I am facing strange issue.

my json:
"create3factory": "0x9fBB3DF7C40Da2e5A0dE984fFE2CCB7C47cd0ABf",
"swapFee": 500,
"airdropRoot": "0x1b32e214013f5a8553866f276bc7cf128541bb0bc55a59101170493a86781059"
}

solidity code:

Code:

struct Constant {
    bytes32 airdropRoot;
    address create3factory;
    uint256 swapFee;
}

string memory json = vm.readFile(path);
bytes memory data = vm.parseJson(json);
Constant memory constantData = abi.decode(data, (Constant));

I am only able to decode this with incorrect order of params in my struct. I dont understand why it works this way. It's completly unintuitive.

I managed to find this out with cast:

❯ cast abi-decode "f()(bytes32,address,uint256)"
0x10x1b32e214013f5a8553866f276bc7cf128541bb0bc55a59101170493a86781059
0x9fBB3DF7C40Da2e5A0dE984fFE2CCB7C47cd0ABf500

when I try with correct order which would be:

Code:

struct Constant {
    address create3factory;
    uint256 swapFee;
    bytes32 airdropRoot;
}

I got a tx revert

Wave_Tronic · Jun 19, 2024

What are you trying to do with this? Just seek a better understanding of the structure and flow? I would say feed this into an LLM like Chat GPT. I have had it analyze some pretty niche error codes and it helped me get a better grasp.

Any solidity meatheads around? ;)

Siff

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Wave_Tronic

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