How to use foundry cast call when the method returns a struct?

Question

In a deployed contract (in sepolia) there is a method readTimelock(address,uint256) that returns a TimeLock, which is a struct like the following:

   struct TimeLock{
     uint160 amount,
     uint64 time,
     bool withdrawn
    }

I would like to make a call to the contract and get that timelock using foundry cast call. I'm trying with something like:

cast call 0x243B56EDb7BD8B0Aa6fE554A4860405717b8CC4a "readTimeLock(address,uint256)(uint160,uint64,bool)" 0x37aFaa6c1B0cD3c92DE24C09451FD046fA7CbfC3 0 --rpc-url $SEPOLIA_URL

The error I get is the following:

(code: -32000, message: execution reverted, data: None)

Unfortunately, in the documentation nothing is said about function returning structs. Thanks. https://book.getfoundry.sh/reference/cast/cast-call

Other errors I get trying different compositions is simply "Invalid data"

Answer 1

SOLVED.

My apologies, it turns out that the syntax call in the question was actually correct. I misspelled the function readTimeLock() which should have been instead of readTimelock().

I guess the lesson here is that when cast throws the error:

 (code: -32000, message: execution reverted, data: None)

it indicates that the method is not part of the code deployed at that contract address, so either a wrong address, a wrong network, or a misspelling of the function.

Anyways, this is the right call:

cast call 0x243B56EDb7BD8B0Aa6fE554A4860405717b8CC4a --rpc-url $SEPOLIA_RPC_URL "readTimelock(address,uint256)(uint160,uint64,bool)" 0x37aFaa6c1B0cD3c92DE24C09451FD046fA7CbfC3 0

which returns three values corresponding to (uint160,uint64,bool):

600
1683570501
false

Answer 2

You can see an example of working with a struct or custom type here in the foundry abi-encode method.

Example:

cast abi-encode "someFunc((string,uint256))" "(myString,1)"

For your TimeLock example:

struct TimeLock{
    uint160 amount,
    uint64 time,
    bool withdrawn
}

cast call 0x243B56EDb7BD8B0Aa6fE554A4860405717b8CC4a "readTimeLock(address,uint256,(uint160,uint64,bool))" 0x37aFaa6c1B0cD3c92DE24C09451FD046fA7CbfC3 0 "(the_uint160,the_uint64,the_bool)" --rpc-url $SEPOLIA_URL