chore(relayer): remove intermediary hop logic

[MatusKysel]

No description provided.

[claude]

Claude finished @MatusKysel's task in 1m 54s —— View job

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PR Review: chore(relayer): remove intermediary hop logic

• Gather context and read changed files
• Review code changes
• Post findings

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Summary: Clean simplification removing the multi-hop intermediary chain logic (L2A → L1 → L2B style routing). The removal is complete and consistent across all layers — CLI flags, config, processor, and proof generation.

Issues Found

1. cacheOption is silently ignored (pre-existing, but more visible now)

packages/relayer/pkg/proof/encoded_signal_proof.go:57

encodedSignalProof, err := encoding.EncodeHopProofs([]encoding.HopProof{{
    ...
    CacheOption:  encoding.CACHE_NOTHING,  // always 0, ignores p.cacheOption
    ...
}})

Prover stores cacheOption int (set from cfg.CacheOption, defaulting to 3 = CACHE_BOTH per the CLI flag), but it's never applied. This was a pre-existing bug in the old hop code too, but now the code is simpler and easier to fix — just use uint8(p.cacheOption) here.

Fix this →

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Minor Observations

2. Trivial wrapper in EncodedSignalProof

packages/relayer/pkg/proof/encoded_signal_proof.go:24-29

func (p *Prover) EncodedSignalProof(ctx context.Context, params SignalProofParams) ([]byte, error) {
    return p.abiEncodeSignalProof(ctx, params)
}

The public function is a single-line passthrough to a private function. With the hop abstraction gone, there's no reason to keep both — just make abiEncodeSignalProof the public function or inline the private one. Minor, not blocking.

3. Stale naming in encoding layer

encoding.EncodeHopProofs and encoding.HopProof types still use "hop" terminology despite this PR removing all hop semantics. Arguably a follow-up cleanup, but it's confusing — we're now passing a single-element slice to a "hops" encoder. Not introduced by this PR, but worth a note.

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What's Good

• The latestBlockID == 0 fallback correctly uses event.Raw.BlockNumber directly now (previously used blockNum which could have been mutated through hop chain traversal).
• Removing 293 lines is always nice. The simplified generateEncodedSignalProof is much easier to follow.
• Config validation for matching hop array lengths is gone since there's nothing to validate.
• Tests updated appropriately to use the new SignalProofParams API.

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The cacheOption issue is worth fixing before merging since the CLI flag default of CACHE_BOTH (3) implies caching behavior that currently does nothing. The rest is cosmetic.

[codecov]

Codecov Report

❌ Patch coverage is 55.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.15%. Comparing base (94730f4) to head (2cf73de).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/relayer/processor/process_message.go	23.52%	10 Missing and 3 partials ⚠️
packages/relayer/pkg/proof/encoded_signal_proof.go	78.26%	3 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
packages/relayer/processor/config.go	61.17% <ø> (+2.17%)	⬆️
packages/relayer/processor/processor.go	0.00% <ø> (ø)
packages/relayer/pkg/proof/encoded_signal_proof.go	75.60% <78.26%> (-3.99%)	⬇️
packages/relayer/processor/process_message.go	36.84% <23.52%> (+3.85%)	⬆️

... and 1 file with indirect coverage changes

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