Ethereum: Find out the reason for the error/revert

Reason for canceling the execution of the forwarder contract

Diving into the code, let’s first try to understand why cancellations occur in the forwarder.execute function. Specifically, I’ll look at the reason behind revertReason and provide suggestions on how to resolve it.

pragma solidity ^0.8.0;
contract Forwarder {
// Forwarder contract logic
function joinChallenge(uint256 _challenge) public view returns (bool): string memory {
// Some forwarding logic here...
// The user signs the authorization request and we return a success result
bool success = true;
return success;
}
function execute() public onlyOwner {
// This is where the backtracking happens...
// The joinChallenge function calls forwarder.joinChallenge
// Here are some things that can cause backtracking:
// 1. Invalid input: If _challenge is not a valid index for the challenge array.
// Solitude returns an error message
// "The arguments passed to joinChallenge are invalid."
revertReason = "Invalid challenge index";
// 2. Gas constraints: The joinChallenge function may exceed 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. Forwarder logic: If there is a problem with the forwarder functionality,
// this can cause a rollback in joinChallenge.
// Here's what can trigger this:
// 1. Internal error: The forwarder encountered an internal error.
// This can be caused by various factors, such as faulty logic or an incorrect assumption.
revertReason = "Internal forwarder error";
// If the rollback occurs, we need to handle it properly
if (revertReason != "Invalid challenge index") {
// Handle the rollback in the joinChallenge function...
// Check the gas limit constraints
gasLimitCheck();
}
}

Suggested solutions

• Input validation

  : Validate the _challenge input to ensure it is a valid array index or a specific value that can be passed to joinChallenge.

• Gas limit constraints: Ensure that the forwarder.joinChallenge function has sufficient gas limits to handle your forwarding contract calls.

• Forwarding logic checks: Implement checks in the forwarding logic to detect and prevent internal errors, such as wrong assumptions or incorrect logic.

Additional tips

• Monitor your forwarding logs for issues that could cause rollbacks.

• Check the gas cost of joinChallenge to ensure it is reasonable and will not exceed the allowed limit.

• Thoroughly test your forwarding contract 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 rollback reason for forwarder.execute and ensure reliable execution of the joinChallenge function.