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nim-chat-poc/cleanup/06-try-catch.md

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Cleanup 06 - defensive try/except removal

Scope: in-scope Nim files (Level 1-5), C++ (logos-rln-module), Rust (lez-rln-ffi). Restore tag: restore/sim-15-15-pass-2026-05-21.

This file supersedes the first-pass audit. The first pass concluded "no removals"; a second pass found three real issues and applied them.

Research notes

waku_client.nim (Level 1): zero try/except.

node_factory.nim (Levels 2 & 5):

  • ~L240-246: parseJson on FFI register_member response (returns Result) - boundary, KEEP.
  • ~L265-278: waitForChainCommit poll loop: parseJson on FFI is_member_registered response. ORIGINAL: silent except CatchableError: continue. APPLIED FIX: narrow to JsonParsingError/JsonKindError and warn-log before continue.
  • ~L295: waitForChainCommit invoked via await - now wrapped in caller's outer flow; left as-is.
  • ~L730-810: Gifter self-registration handler (logs via warn in outer except) - KEEP.
    • INSIDE: ~L775-780 self-reg watcher poll loop. ORIGINAL: silent except CatchableError: continue around await gifter.statusHandler(...) and bare await sleepAsync (CancelledError unhandled). APPLIED FIX: add CancelledError: return carve-outs for both await sites; debug-log + continue for the libp2p I/O CatchableError branch.
  • ~L820-832: gifter client registration RPC - KEEP.
  • Other mountXxx wrappers and library-boundary catches - KEEP per first-pass audit.

rln_gifter/client.nim (Levels 2 & 5):

  • L61-127: libp2p stream I/O writeLp/readLp wrapped in narrow LPStreamError - KEEP (mandated by {.async: (raises: [CancelledError]).} annotation).
  • L148-160: watcher poll loop - already has correct CancelledError: return + CatchableError -> Result.err(...) pattern (NOT silent). KEEP.

rln_gifter/protocol.nim (Levels 2 & 5): server-side handlers - all narrow LPStreamError. KEEP.

logos_core_client.nim (Levels 2 & 5): parseHexInt / parseJson at FFI deserialization boundary - all convert to Result.err(...). KEEP.

onchain_group_manager.nim (Level 3 - mix-rln-spam-protection-plugin):

  • pollLoop L182-194 and L200-220: try/except CatchableError as e: debug "..." wrapping await gm.fetchRoots() and await gm.fetchProof(...). APPLIED FIX: REMOVED both try/except blocks - dead code. The callbacks are typed proc(): Future[...] {.gcsafe, raises: [].} (see L25-26 of same file), so await cannot raise CatchableError. The Result inside the Future is the only error path, and the existing if .isOk/.isErr branches already log it.

spam_protection.nim (Level 3): nullifierLog Table[] access wrapped in narrow KeyError -> Result.err(...). KEEP.

C++ (logos_rln_module.cpp/.h): no try/catch. Rust (lez-rln-ffi/src/lib.rs): no defensive match Err. Out of scope.

Critical assessment by category

  1. libp2p stream I/O catches (client.nim, protocol.nim): KEEP. Narrow LPStreamError, converts to Result. Required by (raises: [CancelledError]) annotation.
  2. chronos CancelledError: KEEP and ADD where missing. Mandatory for graceful task cancellation.
  3. FFI parse boundaries (parseJson, parseHexInt, Address.fromHex): KEEP. Real deserialization trust boundary; converts to typed Result.err.
  4. await mountXxx wrappers (~11 sites): KEEP. Library-boundary try -> err(...).
  5. Table KeyError: KEEP. Library boundary.
  6. Outer wrappers that warn-log: KEEP. Logged failures with intentional retry/continue.
  7. Poll-loop swallow + continue with NO log AND no Result conversion: REMOVE or fix. Two sites in node_factory.nim (waitForChainCommit and self-reg watcher).
  8. try/except CatchableError around await of a {.raises: [].} proc: REMOVE. Dead code by type system.

Applied

vendor/nwaku (Level 2) - branch feat/sim-rln-gifter-auth

waku/factory/node_factory.nim:

  • waitForChainCommit: narrow except CatchableError: continue to except JsonParsingError as e: warn ...; continue + except JsonKindError as e: warn ...; continue.
  • Self-reg watcher poll loop: replace bare await sleepAsync with try/except CancelledError: return; replace silent except CatchableError: continue on await gifter.statusHandler(...) with except CancelledError: return + except CatchableError as e: debug ...; continue.

vendor/mix-rln-spam-protection-plugin/src/mix_rln_spam_protection/onchain_group_manager.nim (Level 3 - branch cleanup):

  • pollLoop: REMOVE both try/except CatchableError as e: debug ... blocks around await gm.fetchRoots() and await gm.fetchProof(...). Callbacks are {.raises: [].} - the except branches were unreachable.

Mirrored to (byte-identical):

  • vendor/logos-lez-rln/logos-delivery/waku/factory/node_factory.nim
  • vendor/logos-lez-rln/logos-delivery-module/vendor/logos-delivery/waku/factory/node_factory.nim
  • vendor/logos-lez-rln/logos-delivery/vendor/mix-rln-spam-protection-plugin/src/mix_rln_spam_protection/onchain_group_manager.nim
  • vendor/logos-lez-rln/logos-delivery-module/vendor/logos-delivery/vendor/mix-rln-spam-protection-plugin/src/mix_rln_spam_protection/onchain_group_manager.nim

Deferred

  • Two parseJson-wrapping CatchableError catches in node_factory.nim register_member (~L240) could be narrowed to JsonParsingError/JsonKindError. Deferred - already at boundary, logs in caller, low value.
  • Gifter self-registration handler (node_factory.nim ~L742-803) outer try/except CatchableError as e: warn: could split the try to wrap only the await gifter.registerHandler(...). Cosmetic; deferred.
  • Rust unwrap() audit on FFI slice -> array conversions: out of try/catch scope (infallible-by-construction claims belong in a separate pass).

Builds

  • make liblogoschat - OK.
  • make liblogosdelivery (under vendor/logos-lez-rln/logos-delivery) - OK.

Sim

Skipped per agent-06 instructions; the user will run a single end-of-pass verification after all 8 agents.