Log: replace additional structure for json by typed fields

[AskAlexSharov]

The ~3x speedup comes from eliminating the gencodec shadow struct + appendCompact double-pass. The benchmark is in execution/types/encdec_test.go:BenchmarkLogJSON
Also -40% memory and -14% allocs across the board. All statistically significant (p=0.008).

┌──────────────────┬──────────────────────────────┬─────────────────────────────┬──────────────────────────────────┐   
  │    Benchmark     │          main (old)          │      this branch (new)      │              Change              │
  ├──────────────────┼──────────────────────────────┼─────────────────────────────┼──────────────────────────────────┤   
  │ Log/Single       │ 2605 ns, 2.0 KiB, 14 allocs  │ 839 ns, 1.2 KiB, 12 allocs  │ -68% time, -40% mem, -14% allocs │
  ├──────────────────┼──────────────────────────────┼─────────────────────────────┼──────────────────────────────────┤   
  │ Log/Batch100     │ 259 µs, 203 KiB, 1302 allocs │ 80 µs, 123 KiB, 1102 allocs │ -69% time, -40% mem, -15% allocs │   
  ├──────────────────┼──────────────────────────────┼─────────────────────────────┼──────────────────────────────────┤   
  │ RPCLog/Single    │ 2769 ns, 2.1 KiB, 15 allocs  │ 910 ns, 1.3 KiB, 13 allocs  │ -67% time, -40% mem, -13% allocs │   
  ├──────────────────┼──────────────────────────────┼─────────────────────────────┼──────────────────────────────────┤   
  │ ErigonLog/Single │ 2759 ns, 2.0 KiB, 15 allocs  │ 906 ns, 1.2 KiB, 13 allocs  │ -67% time, -39% mem, -13% allocs │
  └──────────────────┴──────────────────────────────┴─────────────────────────────┴──────────────────────────────────┘   

[Copilot]

Pull request overview

This PR refactors execution/types.Log JSON encoding by replacing the generated gencodec shadow structs with typed hexutil fields directly on the struct, aiming to improve JSON marshal performance and reduce allocations across log-related RPC paths.

Changes:

• Replaced types.Log JSON gencodec-generated approach with typed hexutil fields and custom UnmarshalJSON validation.
• Updated multiple RPC/execution call sites to populate log fields using hexutil.Uint* wrappers (block number, tx index, log index, timestamps).
• Removed generated JSON files for logs and added a new JSON benchmark for logs.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
txnprovider/shutter/eon_tracker.go	Adjusts block number typing when building call options.
txnprovider/shutter/encrypted_txn_submission.go	Casts event raw block number to uint64 for submission struct.
rpc/rpchelper/logtracer.go	Switches log numeric fields to hexutil wrappers during trace capture.
rpc/rpchelper/logsfilter.go	Switches distributed log numeric fields to hexutil wrappers.
rpc/jsonrpc/receipts/receipts_generator.go	Updates derived log indices to hexutil.Uint.
rpc/jsonrpc/receipts/bor_receipts_generator.go	Updates Bor log indices to hexutil.Uint.
rpc/jsonrpc/eth_simulation.go	Wraps BlockTimestamp as hexutil.Uint64 in simulation results.
rpc/jsonrpc/eth_receipts.go	Wraps log timestamps as hexutil.Uint64 when building responses.
rpc/jsonrpc/eth_mining_test.go	Updates test expectations to use hexutil.Bytes for log data.
rpc/jsonrpc/erigon_receipts.go	Updates indices/timestamps/block numbers to hexutil wrappers in latest-logs path.
rpc/jsonrpc/erigon_receipts_test.go	Updates assertions for hexutil.Uint64 block numbers.
polygon/bor/types/bor_receipt.go	Updates derived receipt log fields to hexutil wrappers.
execution/vm/instructions.go	Updates LOG opcode-generated BlockNumber to hexutil.Uint64.
execution/types/receipt.go	Updates log-derived fields and log-index assertions to use hexutil numeric types.
execution/types/log.go	Core change: typed hexutil fields on Log, custom JSON unmarshal, removal of gencodec override struct.
execution/types/gen_log_json.go	Removes generated log JSON code.
execution/types/gen_erigon_log_json.go	Removes generated erigon-log JSON code.
execution/types/encdec_test.go	Adds JSON benchmark for logs and updates benchmark data generation.
execution/state/intra_block_state.go	Updates log tx/log indices and block number derivation to hexutil wrappers.
execution/exec/txtask.go	Updates receipt log indices and block number derivation to hexutil wrappers.
execution/abi/bind/base_test.go	Updates mock log block number literal to match new typed field.

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[Copilot]

Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated 5 comments.

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[Copilot]

Pull request overview

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

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[yperbasis]

Major

Collapse the double-unmarshal in ErigonLog/RPCLog (execution/types/log.go:111,152). Each calls l.Log.UnmarshalJSON(input) and then json.Unmarshal(input, &dec) — parsing the full
input twice. A single flat struct with Timestamp/BlockTimestamp added avoids it. The old gencodec versions parsed once. The benchmark only covers marshal, so this regression isn't
currently visible.

Minor

1. Benchmark only covers Marshal. Given this PR rewrites both paths, add BenchmarkLogJSONDecode/Unmarshal to verify unmarshal hasn't regressed (see point 1).
2. erigon_receipts.go:354 — int(log.TxIndex) == len(body.Transactions) then body.Transactions[log.TxIndex]. The int() cast on one line and implicit hexutil.Uint → int conversion for
   indexing on the next is slightly inconsistent; consider txi := int(log.TxIndex) once at the top, used for both.
3. RPCLog.BlockTimestamp type change (hexutil.Uint → hexutil.Uint64) is an incidental correctness improvement — the old code would truncate timestamps past 2^32 on 32-bit builds.
   Worth a one-line PR note.