chore(perf): optimize eth_feeHistory

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• avoid grabbing event logs for fee history (it's not needed - we only need receipts)
• avoid wasteful load_child_tipset - the maximum block walk we allow for this method is 1024, so there would be 1023 completely wasteful blocking tasks just to get message receipt, which we already have, given we walk from newest to oldest.
• this nicely improves the methods questionable performance (especially around P99 - ~500 ms), while doing less work. A naive alternative was to parallelize the entire walk, but it'd just increase resource usage and possibly exhaust blocking task pool.

Reference issue to close (if applicable)

Closes

Other information and links

┌────────────┬──────────────────────┬────────────────────┬───────┐
│ blockCount │ baseline (no-thread) │     threading      │  win  │
├────────────┼──────────────────────┼────────────────────┼───────┤
│ 500        │ 0.221s median        │ 0.024s             │ ~9.2× │
├────────────┼──────────────────────┼────────────────────┼───────┤
│ 1024       │ 0.441s (0.587 max)   │ 0.051s (0.215 max) │ ~8.6× │
└────────────┴──────────────────────┴────────────────────┴───────┘

We might be doing similar silly thing elsewhere. To be investigated.

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.

Outside contributions

• This pull request is based on an issue that a maintainer has accepted (see Before Opening a Pull Request).
• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Performance

  • Improved fee history retrieval by using available message receipts more efficiently.
  • Reduced unnecessary processing when retrieving contract bytecode and calculating gas reward data.

• Reliability

  • Added fallback handling when receipt data is unavailable.
  • Added validation to ensure messages and receipts remain correctly ordered and matched.
  • Improved consistency when retrieving receipts across related tipsets.

[coderabbitai]

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📒 Files selected for processing (5)

• src/rpc/methods/eth.rs
• src/shim/executor.rs
• src/shim/executor/test_utils.rs
• src/state_manager/mod.rs
• src/state_manager/state_computation.rs

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Walkthrough

StateManager now resolves ordered message/receipt pairs from cached execution, stored receipts, or RPC fallback. eth_feeHistory uses this data across tipsets, while eth_getCode reads bytecode directly from actor state. Test-only executor helpers moved to test_utils.

Changes

Receipt lookup and Ethereum RPC integration

Layer / File(s)	Summary
Message/receipt representation and test utilities src/state_manager/mod.rs, src/shim/executor.rs, src/shim/executor/test_utils.rs	TipsetMessageReceipts represents executed or stored message/receipt pairs. Test utilities provide receipt, entry, and event constructors plus receipt generators.
Receipt resolution and validation src/state_manager/state_computation.rs	StateManager::tipset_message_receipts resolves cached, stored, or RPC-generated pairs. It validates parentage and message/receipt counts. Tests cover the resolution paths.
Fee history receipt traversal src/rpc/methods/eth.rs	eth_feeHistory uses the new receipt lookup method, carries the current tipset as the next receipt source, and derives gas rewards from paired messages and receipts.
Direct actor bytecode lookup src/rpc/methods/eth.rs	eth_getCode reads bytecode through ActorStateEthExt::eth_bytecode without executing GetBytecode.
Explicit event source wiring src/rpc/methods/eth.rs	Event collection receives an explicit absent message source.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟡 Moderate · up to f3e9f

The optimization changes how historical receipts are loaded, but stored receipt entries may still be matched to the wrong messages when entries are sparse or shifted. That can produce incorrect fee-history results, so merge should wait for this correctness issue to be fixed or explicitly accepted by the owner.

Sequence Diagram(s)

sequenceDiagram
  participant eth_feeHistory
  participant StateManager
  participant ReceiptStorage
  participant RPCExecution
  eth_feeHistory->>StateManager: request tipset message/receipt pairs
  StateManager->>ReceiptStorage: load stored messages and receipts
  ReceiptStorage-->>StateManager: return stored data
  StateManager->>RPCExecution: execute when stored data is unavailable
  RPCExecution-->>StateManager: return executed messages and receipts
  StateManager-->>eth_feeHistory: return ordered pairs
  eth_feeHistory->>eth_feeHistory: build gas rewards and carry receipt source

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Suggested reviewers: sudo-shashank, hanabi1224

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: performance optimization of eth_feeHistory.
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch eth-feehistory-skip-events

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch eth-feehistory-skip-events

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Actionable comments posted: 2

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Inline comments:
In `@src/state_manager/state_computation.rs`:
- Around line 98-108: Update the receipt-loading flow in the state computation
method around Receipt::get_receipts so it preserves each receipt’s AMT index and
validates that indices match message positions starting at zero. Reject any
hole, nonzero first index, or other positional mismatch before constructing
TipsetMessageReceipts::Stored; retain the existing count validation and error
propagation.
- Around line 92-114: Update the receipt-loading flow around
Receipt::get_receipts and TipsetMessageReceipts::Stored to preserve AMT receipt
indices and validate that they are present and aligned with message positions,
rejecting missing or shifted indices before pairing. Add contextual errors to
load_child_tipset, messages_for_tipset, and load_executed_tipset_for_rpc,
including ts.key() and the receipt root whenever available.

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• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

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Run ID: 26b76f79-7122-4d1e-a345-28d8114a6503

📥 Commits

Reviewing files that changed from the base of the PR and between bc06b0f and 8ddccc2.

📒 Files selected for processing (4)

• src/rpc/methods/eth.rs
• src/shim/executor.rs
• src/state_manager/mod.rs
• src/state_manager/state_computation.rs

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• filecoin-project/lotus (manual)

Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 4 reviews per hour.

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.22%. Comparing base (3e1f9e9) to head (f3e9fc1).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/state_manager/state_computation.rs	96.62%	0 Missing and 5 partials ⚠️
src/rpc/methods/eth.rs	91.66%	0 Missing and 1 partial ⚠️
src/shim/executor/test_utils.rs	98.92%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/shim/executor.rs	84.42% <ø> (-4.51%)	⬇️
src/state_manager/mod.rs	65.28% <100.00%> (+0.80%)	⬆️
src/rpc/methods/eth.rs	69.35% <91.66%> (+0.01%)	⬆️
src/shim/executor/test_utils.rs	98.92% <98.92%> (ø)
src/state_manager/state_computation.rs	85.71% <96.62%> (+3.66%)	⬆️

... and 8 files with indirect coverage changes

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[akaladarshi]

I think we can add more test directly testing the tipset_message_receipts using the chain4u! macro.

[LesnyRumcajs]

I think we can add more test directly testing the tipset_message_receipts using the chain4u! macro.

@akaladarshi I opted out of chain4u due to some of its limitations that'd bloat the test. I think it's more understandable without doing the autowiring.

I also moved some test utils out of "prod" modules so they don't pollute it.