Reverting the Reason for Forwarder Contract Execution
As we dive into the code, let’s first try to understand why there are reverts in the forwarder.execute function. Specifically, I’ll investigate the reason behind the revertReason and suggest a solution.
pragma solidity ^0.8.0;
contract forwarder {
// Forwarder contract logic
function joinChallenge(uint256 _challenge) public view return (bool): string memory {
// Some forwarding logic here...
// The user signs the authorization request and we return a successful result
bool success = true;
return success;
}
function execute() public onlyOwner {
// This is where the rollback happens...
// The joinChallenge function calls the forwarder.joinChallenge function
// Here are some possible causes for the rollback:
// 1. Invalid input: If _challenge is not a valid index into the array of challenges.
// Solitude returns an error message
// "The arguments passed to joinChallenge are invalid."
revertReason = "Invalid challenge index";
// 2. Gas limit: The joinChallenge function may have exceeded the allowed gas limit.
// The gas cost of calling joinChallenge may be too high, causing the contract to exhaust its resources.
// In this case, Solitude returns an error message
revertReason = "Gas consumption exceeded";
// 3. Forwarding logic: If there is a problem with the forwarder,
// it can cause a rollback in joinChallenge.
// Here is what can cause this:
// 1. Internal error: The forwarder has encountered an internal error.
// This can be caused by various factors, such as faulty logic or incorrect assumptions.
revertReason = "Internal Forwarding Error";
// If a rollback occurs, we need to handle it correctly
if (revertReason != "Invalid Challenge Index") {
// Handling rollback in joinChallenge function...
// Check gas limit
gasLimitCheck();
}
}
Solution suggestions
- Input Validation
: Validate the
_challenge' input to ensure that it is a valid array index or a specific value that can be passed tojoinChallenge’.
- Gas Limitation Checks
: Verify that the
forwarder.joinChallengefunction has sufficient gas limits to handle calls from the forwarding contract.
- Forwarder Logic Checks: Perform checks within the forwarding logic to detect and prevent internal errors such as incorrect assumptions or incorrect logic.
Additional Advice
- Monitor your forwarding logs for any issues that could cause a rollback.
- Review the gas cost of “joinChallenge” to ensure that it is reasonable and does not exceed the allowable limit.
- Test your forwarding contract thoroughly to identify potential regressions or edge cases.
- Consider implementing more robust input validation, gas limits, and error detection mechanisms to prevent rollbacks in the future.
By addressing these areas, you should be able to resolve the “forwarder.execute” reset reason and ensure reliable execution of the “joinChallenge” function.