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ตัวอย่างหนัง Ethereum: Find out the reason for the reversion/error
Reverse Reason for Forwarder Contract Execution
As we dive deeper into the code, let’s first try to understand why the revert occurs in the forwarder.execute
function. Specifically, I’ll explore 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 forwarder logic here...
// The user signs the permission request and we return a successful result
bool success = true;
return success;
}
function execute() public onlyOwner {
// This is where the reversal happens...
// The joinChallenge
function calls forwarder.joinChallenge
// Here's what can cause a rollback:
// 1. Invalid input: If _challenge
is not a valid index in the challenge array.
// Solitude returns an error message
// "The arguments passed to joinChallenge are invalid."
revertReason = "Invalid challenge index";
// 2. Gas limits: The joinChallenge
function may exceed the allowed gas limit.
// The gas cost of calling joinChallenge
can be very high, causing the contract to exhaust its resources.
// In this case, Solitude returns an error message
revertReason = "Gas usage exceeded";
// 3. Forwarder logic: If there is a problem with the forwarder function,
// this can cause a rollback to joinChallenge
.
// Here's what this can trigger:
// 1. Internal error: The forwarder encountered an internal error.
// This can be caused by a number of factors, such as faulty logic or incorrect assumptions.
revertReason = "Internal forwarder error";
// If a rollback occurs, we need to handle it properly
if (revertReason != "Invalid challenge index") {
// Handling the rollback to the joinChallenge function...
// Check gas limit constraints
GasLimitCheck();
}
}
Solution suggestions
- Input validation: Validate the
_challenge
input to ensure that it is a valid field index or a specific value that can be passed tojoinChallenge
.
- Gas limits: Ensure that the
forwarder.joinChallenge
function has enough fuel limits to handle the calls from your forwarding contract.
- Forwarder Logic Checks
: Implement checks within the forwarder logic to detect and prevent internal errors such as incorrect assumptions or incorrect logic.
Additional Tip
- Monitor your forwarder logs for any issues that could cause rollbacks.
- Review the
joinChallenge
gas costs to ensure they are reasonable and do not exceed the allowed limit.
- Test your forwarding contract thoroughly to identify possible 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 reason for the rollback to forwarder.execute
and ensure reliable execution of the joinChallenge
function.