feat(x/distribution): panic on negative CommunityPool in ValidateGenesis

[crStiv]

Changes ValidateGenesis to panic instead of returning an error when CommunityPool is negative.

Summary by CodeRabbit

• Refactor
  • Adjusted fee distribution validation to enforce stricter checks. The system now immediately terminates execution upon detecting an invalid fee pool value, ensuring enhanced stability and integrity.

[coderabbitai]

📝 Walkthrough

Walkthrough

The change updates the error handling within the ValidateGenesis method of the FeePool struct in the x/distribution/types/fee_pool.go file. Instead of returning an error when a negative value is found in the CommunityPool, the method now triggers a panic. No modifications were made to the declarations of public entities.

Changes

File	Change Summary
x/distribution/types/fee_pool.go	Updated ValidateGenesis to panic on negative CommunityPool instead of returning an error.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant ValidateGenesis
    Note over ValidateGenesis: Begin validation
    Caller->>ValidateGenesis: Invoke ValidateGenesis()
    ValidateGenesis->>ValidateGenesis: Check if CommunityPool is negative
    alt Negative CommunityPool
        ValidateGenesis->>System: panic("negative CommunityPool in distribution fee pool, is ...")
    else Non-negative CommunityPool
        ValidateGenesis->>Caller: Continue normal execution
    end

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📥 Commits

Reviewing files that changed from the base of the PR and between 0a98b65 and 7cd2c4d.

📒 Files selected for processing (1)

• x/distribution/types/fee_pool.go (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

`**/*.go`: Review the Golang code for conformity with the Ub...

**/*.go: Review the Golang code for conformity with the Uber Golang style guide, highlighting any deviations.

• x/distribution/types/fee_pool.go

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: Summary

🔇 Additional comments (1)

x/distribution/types/fee_pool.go (1)

23-24:

❓ Verification inconclusive

Behavior change from returning an error to triggering a panic

The change from returning an error to triggering a panic represents a significant shift in error handling strategy. This modification aligns with the PR objective to enforce stricter validation for negative CommunityPool values during genesis validation.

While the panic approach ensures immediate termination for invalid states, it's worth noting that this creates an unrecoverable situation unless the calling code implements panic recovery. According to the Uber Golang style guide, panics should typically be reserved for truly exceptional conditions that indicate program bugs rather than expected error conditions.

Since this appears to be an intentional design decision (as suggested by the removed TODO comment), this implementation is acceptable. However, consider these points:

1. The function still returns an error type, which may confuse callers expecting consistent error handling
2. Proper documentation explaining the panic condition would help future maintainers

---

🏁 Script executed:

#!/bin/bash
# Check how errors are handled in other ValidateGenesis functions in the codebase

# Look for other ValidateGenesis functions that use panic in the cosmos-sdk codebase
echo "Finding other ValidateGenesis functions that use panic:"
rg "func.*ValidateGenesis.*panic" --type go

# Look for ValidateGenesis functions that return errors instead
echo -e "\nFinding ValidateGenesis functions that return errors:"
rg "func.*ValidateGenesis.*return (fmt\.Errorf|errors\.|sdkerrors\.)" --type go -A 1

Length of output: 376

---

Attention: Verify Consistency of Panic Usage in ValidateGenesis

This implementation intentionally opts to panic when a negative CommunityPool is detected during genesis validation to enforce stricter state guarantees. Please note the following:

• Although this change is deliberate (as indicated by the removed TODO), the function still returns an error type. This mismatch between the panic behavior and the error return signature may confuse callers expecting traditional error handling.
• It is advisable to enhance documentation surrounding this panic condition to clearly communicate the rationale and expected behavior to future maintainers.
• Since our initial search for similar ValidateGenesis functions (using both panic and error returns) yielded no results, please manually verify that this approach is consistent across the codebase where applicable.

✨ Finishing Touches

• 📝 Generate Docstrings (Beta)

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