Fix empty params handling in StateDecodeParams

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Fix mismatch between lotus and forest for methods with empty params and add missing test for all actors supported.

| RPC Method                       | Forest  | Lotus   | Status        |
|----------------------------------|---------|---------|---------------|
| Filecoin.StateDecodeParams (250) | 250/250 | 250/250 | ✅ All Passed |

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Summary by CodeRabbit

• Tests

  • Expanded test coverage for state decode parameter API by adding new cases for reward, power, and system actors with empty parameters.
  • Added corresponding new snapshot entries for these tests.

• Bug Fixes

  • Adjusted handling of empty parameters in RPC methods to return an empty JSON object instead of a unit type, improving consistency in responses.

[coderabbitai]

Walkthrough

The changes update the register_actor_methods! macro to modify the closure return type for methods with empty parameters from Result<()> to Result<serde_json::Value>, returning an empty JSON object instead of unit. Additional test cases for actor methods with empty parameters are added, and corresponding test snapshots are appended.

Changes

Cohort / File(s)	Change Summary
Macro Closure Return Type Update src/rpc/registry/methods_reg.rs	Changes the closure in the macro for empty parameters to return Result<serde_json::Value> and an empty JSON object, instead of Result<()> and unit.
Expanded Test Coverage for Empty Params src/tool/subcommands/api_cmd/api_compare_tests.rs	Adds new test cases for several actor methods with empty parameters, increasing test coverage for REWARD_ACTOR, POWER_ACTOR, and SYSTEM_ACTOR in state decode parameter tests.
New Test Snapshots src/tool/subcommands/api_cmd/test_snapshots.txt	Appends eight new snapshot file entries for the added state decode parameter tests.

Sequence Diagram(s)

sequenceDiagram
    participant TestSuite as Test Suite
    participant RPC as RPC Registry
    participant Macro as register_actor_methods! Macro

    TestSuite->>RPC: Call method with empty parameters
    RPC->>Macro: Invoke closure for method
    Macro-->>RPC: Return Result<serde_json::Value> (empty JSON object)
    RPC-->>TestSuite: Return empty JSON object as result

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• feat: add support for system actor in state decode params API #5861: Directly related to handling empty parameters and system actor support in the same macro and method registry code.
• feat: add support for power actor methods in StateDecodeParams API #5875: Related through changes to the macro handling empty parameters and version-aware registration for power actor methods.
• feat: add support for reward actor in state decode params API #5888: Related via macro changes and reward actor method registrations and tests using the updated macro.

Suggested reviewers

• LesnyRumcajs
• hanabi1224

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📥 Commits

Reviewing files that changed from the base of the PR and between 0d7686c and 8d037f1.

📒 Files selected for processing (2)

• src/rpc/registry/methods_reg.rs (1 hunks)
• src/tool/subcommands/api_cmd/test_snapshots.txt (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• src/rpc/registry/methods_reg.rs

🚧 Files skipped from review as they are similar to previous changes (1)

• src/tool/subcommands/api_cmd/test_snapshots.txt

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