chore: add Reason() method to VmError interface #8
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (2)
x/evm/types/errors_test.go (1)
55-91: Consider adding documentation to explain test cases.While the test cases are comprehensive, adding comments to explain the purpose and expected behavior of each test case would improve maintainability. Consider documenting:
- The significance of the
revertSelectorin error handling- Why certain byte sequences are used in the test data
- The relationship between
vmErr,reason, andretfieldsfunc TestNewVmErrorWithRet(t *testing.T) { + // TestNewVmErrorWithRet validates the behavior of NewVmErrorWithRet function + // by testing various scenarios of error creation with different return data formats. testCases := []struct { name string vmErr string reason string ret []byte hash string }{ + // Test empty return data handling { "Empty reason", "execution reverted",x/evm/types/errors.go (1)
Line range hint
279-297: Consider enhancing error handling in NewVmErrorWithRetWhile the implementation is functional, there are a few areas where error handling could be improved:
- The error from
abi.UnpackRevertis silently ignored if unpacking fails. Consider logging or including this error in the JSON output for debugging purposes.- The reason field is only populated for
ErrExecutionReverted. Consider documenting this limitation or providing a meaningful value for other error types.Here's a suggested improvement:
if e.vmErr == vm.ErrExecutionReverted.Error() { e.err = vm.ErrExecutionReverted e.ret = common.CopyBytes(ret) reason, errUnpack := abi.UnpackRevert(e.ret) if errUnpack == nil { e.err = fmt.Errorf("%s: %s", e.err.Error(), reason) e.reason = reason e.cause = errorsmod.Wrap(ErrExecutionReverted, e.toJSON()) + } else { + e.reason = "failed to unpack revert reason" + e.cause = errorsmod.Wrapf(ErrExecutionReverted, "failed to unpack revert reason: %v", errUnpack) } } else { e.err = errors.New(e.vmErr) + e.reason = e.vmErr // Use VM error as reason for non-revert errors e.cause = errorsmod.Wrap(ErrVMExecution, e.toJSON()) }
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Review profile: CHILL
📒 Files selected for processing (2)
- x/evm/types/errors.go (1 hunks)
- x/evm/types/errors_test.go (1 hunks)
🔇 Additional comments (4)
x/evm/types/errors_test.go (1)
54-104: Implementation aligns well with PR objectives.The test implementation effectively validates the new
Reason()method functionality while maintaining comprehensive coverage of various error scenarios. The test structure ensures that theVmErrorinterface enhancement works as intended.x/evm/types/errors.go (3)
131-131: LGTM: Clean interface additionThe new
Reason()method is a well-designed addition to theVmErrorinterface, maintaining consistency with existing methods and providing a clean way to access error reasons.
Line range hint
132-150: LGTM: Clean implementation of Reason() methodThe implementation follows the established pattern of other getter methods in the struct, including proper nil checks and consistent error handling.
Line range hint
279-297: Verify security implications of unconstrained revert reasonsThe current implementation accepts revert reasons without validation, which could lead to potential issues:
- Memory exhaustion from extremely large revert reasons
- Potential XSS if the error messages are displayed in a web interface
- Log injection if the reasons are written to logs
Let's verify the maximum size of revert reasons in the codebase:
| for _, tc := range testCases { | ||
| tc := tc | ||
| vmErrorWithRet := NewVmErrorWithRet( | ||
| tc.vmErr, | ||
| tc.ret, | ||
| tc.hash, | ||
| 0, | ||
| ) | ||
| require.Equal(t, tc.vmErr, vmErrorWithRet.VmError()) | ||
| require.Equal(t, tc.reason, vmErrorWithRet.Reason()) | ||
| } | ||
| } |
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🛠️ Refactor suggestion
Enhance test robustness and organization.
Consider the following improvements to strengthen the test implementation:
- Move the gas value into the test case structure instead of hardcoding it
- Use
t.Runfor subtests to improve test organization and output - Add assertions for complete error state (e.g., hash value)
testCases := []struct {
name string
vmErr string
reason string
ret []byte
hash string
+ gas uint64
}{
{
"Empty reason",
"execution reverted",
"",
nil,
"0x",
+ 0,
},
// ... other test cases
}
for _, tc := range testCases {
- tc := tc
- vmErrorWithRet := NewVmErrorWithRet(
- tc.vmErr,
- tc.ret,
- tc.hash,
- 0,
- )
- require.Equal(t, tc.vmErr, vmErrorWithRet.VmError())
- require.Equal(t, tc.reason, vmErrorWithRet.Reason())
+ tc := tc // capture range variable
+ t.Run(tc.name, func(t *testing.T) {
+ vmErrorWithRet := NewVmErrorWithRet(
+ tc.vmErr,
+ tc.ret,
+ tc.hash,
+ tc.gas,
+ )
+ require.Equal(t, tc.vmErr, vmErrorWithRet.VmError())
+ require.Equal(t, tc.reason, vmErrorWithRet.Reason())
+ require.Equal(t, tc.hash, vmErrorWithRet.ErrorData())
+ })
}Committable suggestion was skipped due to low confidence.
This PR just adds the
Reasonmethod to theVmErrorinterface.The method is already implemented by
vmErrorWithRet.It's useful to have access to the
reasonfield when there's andexecution revertederror.Summary by CodeRabbit
New Features
Reason()method to provide detailed error information for EVM execution failures.Bug Fixes
Tests