Ethereum: Find out revert/error reason

Reversal Reason for Forwarder Contract Execution

As we delve deeper into the code, let’s first try to understand why rollbacks occur in the forwarder.execute function. Specifically, I’ll examine the revertReason reason and provide suggestions on how to resolve it.

pragma strength ^ 0,8,0;
contract forwarder {
// Forwarder Contract Logic
function joinChallenge(uint256 _challenge) public view returns (bool): string memory {
// Here's some forwarding logic...
// The user signs the authorization request and we return a successful result
bool success = true;
return success;
}
functionexecute() public onlyOwner {
// Here's where the turnaround happens...
// The joinChallenge function calls forwarder.joinChallenge
// This can cause a rollback:
// 1. Invalid input: if _challenge is not a valid index into 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 price for calling joinChallenge may be too high, causing the contract to exhaust its resources.
// In this case, Solitude returns an error message
revertReason = "Gas usage exceeded";
// 3. Revert logic: If there is a problem with the reversion function,
// it may cause the changes in joinChallenge to be rolled back.
// Here is what can cause this:
// 1. Internal error: An internal error occurred while reversion.
// This can be caused by several factors, such as faulty logic or incorrect assumptions.
revertReason = "Internal Revert Error";
// If a rollback occurs, we need to handle it properly
if (revertReason != "Invalid challenge index") {
// Handle the rollback in the joinChallenge function...
// Check gas limit constraints
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 to joinChallenge.

• Gas Limits

  

  : Verify that the forwarder.joinChallenge function has sufficient gas limits to handle your calls based on the forwarding contract.

• Forwarding Logic Controls: Implement controls within the forwarding logic to detect and prevent internal errors such as incorrect assumptions or incorrect logic.

Additional Tips

• Monitor your forwarding logs for issues that could cause a rollback.

• Please review the gas costs within joinChallenge to ensure that they are reasonable and do not exceed the allowed limit.

• Thoroughly test your forwarding contract to identify potential regressions or edge cases.

• Consider implementing stronger 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 reason for the forwarder.execute return and ensure reliable execution of the joinChallenge function.

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