LAB-1203: fold generate-bin-twin into upsert-by-name generate, sharing the envelope codec with wire-format-reference - #56
LAB-1203: fold generate-bin-twin into upsert-by-name generate, sharing the envelope codec with wire-format-reference#5627Bslash6 wants to merge 5 commits into
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…(LAB-1203) python-frame-reference.py 'generate' rewrote the whole fixture from whatever the installed wheel could produce, so every vector the wheel could not rebuild was one guard away from silent deletion — LAB-903 found exactly that as a CRIT and PR #47 patched it with a drop-refusal. Upsert-by-name dissolves the hazard instead of guarding it: only vectors the wheel reproduces are rewritten (matched by name), everything else stays byte-untouched, so dropping a committed vector is structurally impossible and the drop guard, both wheel-direction refusals, and the generate-bin-twin entry point are deleted. The wheel's envelope encoding now selects WHICH default-path vector it rebuilds: a protocol 1.1 (bin) wheel upserts the _bin twin, a legacy wheel the legacy original. The pair is still proven to differ only in envelope encoding before anything is written (the LAB-903 twin-lie protection), and rewritten vectors carry per-vector generator provenance; a no-op run never rewrites the file. The ByteStorage envelope codec is no longer reimplemented: encode/decode come from wire-format-reference.py (stdlib-only, so 'verify' stays dependency-free), with a new generation-time fidelity check that the shared encoder reproduces the wheel's envelope byte-identically. This also makes the Python verifier enforce the protocol 1.1 flip exclusions (checksum stays int-array, format stays fixstr) that previously only the Node cross-check enforced. Verified: fixture byte-unchanged; no-op generate under cachekit 0.17.1 byte-identical; subset run (no pyarrow) preserves arrow vector; six-class mutation suite still fails in BOTH independent verifiers; full local verify.yml suite green.
…rence Panel (high stakes, 4 agents) found one CRIT and two MAJ, all applied: - CRIT: sharing decode_envelope silently WEAKENED verify — the old tag sniff required the 0x94 fixarray(4) marker, the shared decoder tolerates array16/array32 outer headers (reader-lenient), and the Node cross-check was always lenient there too, so a spec-violating dc0004 envelope passed both verifiers. verify now requires the envelope to re-encode byte-identically via the shared codec, pinning the canonical rmp_serde shortest-form encoding — strictly stronger than the pre-refactor check. - MAJ: the twin-equivalence proof compared expected_header as a parsed dict; a wheel changing header JSON serialization (dict-equal, byte-different) could upsert a byte-level non-twin. Now compares frame prefixes (magic/version/header) at the byte level. - MAJ: rewriting a previously-unstamped vector would falsify the top-level 'unchanged since' provenance claim. generate now flips the top-level field to an explicit mixed-provenance statement (idempotent) when that happens. - MIN: verify pins declared compressed_data_hex/checksum_hex/original_size/ format against the decoded envelope bytes (previously Node-only); generate prints WHICH vectors it rewrote; no-op message no longer reads as fixture totals; dead type-narrowing assert removed. Mutation suite extended to 8 classes — all fail the stdlib verifier; the twin guard refuses both field drift and header-byte drift with named invariants. No-op generate remains byte-identical (subset and full venvs), second runs idempotent, full local verify.yml suite green.
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WalkthroughThe Python frame reference generator now uses the shared envelope codec, upserts vectors by name, preserves unreproducible vectors, records provenance, and validates canonical bytes and encoding twins. Arrow generation is optional. The standalone ChangesFrame reference generation
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The fixture-generation refactor is otherwise mergeable, but the changelog overstates when twin-equivalence validation runs; update the wording or explicitly accept this documentation mismatch before merging. Sequence Diagram(s)sequenceDiagram
participant Generator
participant PythonWheel
participant WireFormatReference
participant Fixture
Generator->>PythonWheel: generate frame envelope
PythonWheel-->>Generator: return emitted bytes
Generator->>WireFormatReference: decode and canonically re-encode
WireFormatReference-->>Generator: return validated envelope
Generator->>Generator: build and validate encoding twin
Generator->>Fixture: upsert vectors by name
Fixture-->>Generator: preserve unreproduced vectors
Generator->>Fixture: write only changed content
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 1 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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…ivalence (LAB-1203) Kody review finding on PR #56: generate() only ever rebuilds the one default-path vector the installed wheel's encoding selects, but the twin-equivalence guard hard-required BOTH twins in the merged fixture, so a partial fixture (fresh bootstrap, or a deliberately removed vector) aborted before writing anything — a regression from the removed append-only generate-bin-twin, which tolerated an absent twin. The guard now no-ops when either twin is absent (nothing is comparable) and prints a stderr note instead of skipping silently. Enforcement when both twins exist is unchanged — field drift and frame-prefix byte drift are still refused before any write. Completeness stays gated where it always was: verify()'s coverage floor fails the fixture until both int-array and bin encodings are observed, and _upsert never removes, so an established fixture cannot regress into the skip branch. Expert panel (high stakes, 4 agents) on this diff: bug-hunter, security and pragmatism legs all clear; craftsman's doc findings applied (docstring states the no-op, comment states the floor pins encodings not names). Rejected: pinning the twin names inside verify()'s coverage floor — that reintroduces the same fixture-shape rigidity in the verifier that this fix removes from the generator.
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Inline comments:
In `@CHANGELOG.md`:
- Around line 101-102: Update the changelog statement about default-path twin
equivalence to qualify that the proof applies only when both twins are present
in the fixture, matching the no-op behavior of _require_twin_equivalence when
either twin is absent.
In `@tools/python-frame-reference.py`:
- Line 376: Split generate() to reduce its statement count below Ruff’s PLR0915
threshold by extracting error-vector construction and real-implementation checks
into a focused helper such as _build_error_vectors(raw_frame, msgpack). Keep
generate() responsible for the overall frame-vector flow, add appropriate type
hints, and preserve existing behavior while favoring guard clauses over
additional nesting.
- Line 57: Update _load_wire_format_codec with a return type annotation of
ModuleType and add the corresponding import from types alongside the
standard-library imports, preserving its existing behavior.
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…AB-1203) Three CodeRabbit findings on PR #56: - ANN202: _load_wire_format_codec returns a module, so annotate it ModuleType rather than leaving the one unannotated def in the file. - PLR0915: generate() carried 56 statements against a 50 ceiling. The error-vector construction is the natural seam — it depends only on raw_frame plus the two generation-time imports and shares no state with the frame-vector flow — so it moves to _build_error_vectors(). Every real-implementation check moves with it unchanged: each vector is still proven rejected by cachekit-py, and the interop vector still proven rejected by a strict msgpack reader, before anything can be written. - CHANGELOG overstated the twin-equivalence guard. Since 3a6cd52 the guard no-ops when either twin is absent, so the entry now scopes the claim to a complete pair and names the skip. The extraction is proven behaviour-preserving, not merely assumed: running generate on the same wheel before and after produces byte-identical output (both report the fixture already up to date, nothing written), and the stdlib verify leg — the CI check — passes on all 8 vectors. verify()'s own PLR0915 (79 statements) is pre-existing and untouched here.
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@coderabbitai review Pushed e803fda addressing all three findings: |
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Inline comments:
In `@tools/python-frame-reference.py`:
- Around line 405-406: Refactor the loop’s ValueError rejection probe out of the
try block into a small typed helper, then call that helper for each vector.
Remove the loop-level try/except while preserving the current behavior of
ignoring rejected vectors, and keep the implementation Ruff-compatible with
PERF203.
- Line 408: Define a named generation-invariant exception for the cachekit-py
error-vector assertion messages, with construction logic that produces the
existing context, then replace the AssertionError raises at both referenced
sites with this exception while preserving their current messages and behavior.
Ensure the Python changes satisfy Ruff TRY003.
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…tors (LAB-1203) Expert-panel finding (bug-hunter, security, craftsman, catchphrase; high stakes). Both quality reviewers converged independently: threading `msgpack` and `SerializationWrapper` in as parameters bought no seam at a single call site, and the annotations were vacuous — `type` admits every class and `ModuleType` every module, so neither constrained what the body actually needs. The file's own sibling `_build_default_path_vector()` already sets the convention: no parameters, function-local generation-only imports. Both are sys.modules-cached by the time this runs, so the re-import costs nothing. Also dropped the "(PLR0915)" citation from the docstring. This repo has no pyproject.toml and no ruff config, and CI runs only the vector verify — the rule came from a review bot's on-diff analysis, so naming it in a docstring pointed at a gate that does not exist and invited someone to "finish the job" on verify() (79 statements, deliberately out of scope here). Still byte-identical: generate on the same wheel reports the fixture already up to date, and the emitted file diffs clean against the committed one. Panel findings rejected, with reasons: - Craftsman: make the two moved invariants raise ValueError via the file's _require() convention rather than AssertionError. Both raises predate this PR and moved across unchanged; rewriting them would break the character-identical-lift property this extraction was accepted on, for a pre-existing asymmetry outside the diff. Worth its own ticket. - Catchphrase: trim the saas wildcard comment to two lines. Kept at five — the LAB-1207 memory entry recorded the buggy path==='/*' skip *as design*, which is precisely the repeat this comment exists to prevent. The craftsman independently judged it sufficient.
Expert panel — high stakes, appliedRan the mandatory panel (bug-hunter-supreme, security-specialist, code-craftsman, catchphrase-agent) over Applied
Rejected, with reasons
Verification after the panel change: Bug-hunter verified the extraction mechanically rather than taking my word: it diffed the extracted body against the pre-commit inline block and found it character-identical modulo the one rename, and confirmed Per the LAB-423 precedent, this diff is |
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@coderabbitai review Pushed e7dfbdc (expert-panel finding: dropped the injected module/class from _build_error_vectors, and the PLR0915 citation naming a gate this repo does not run). PERF203 and TRY003 are rejected in-thread with reasons — both sites are character-identical lifts of pre-existing code that only entered the diff because the extraction moved them, and rewriting them would spend the behaviour-preserving guarantee the extraction was accepted on. The TRY003 point has a real convention asymmetry underneath it; I've suggested it as its own ticket. |
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🧠 Learnings used
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1 participant
Resolves LAB-1203 (filed by the LAB-903 expert panel as deferred follow-up 1 of 2; predecessor: #47).
Problem
tools/python-frame-reference.pyhad two generation entry points because neither could do the other's job:generaterewrote the whole fixture from whatever the installed wheel could produce (so any vector the wheel couldn't rebuild was one guard away from silent deletion — the LAB-903 CRIT), andgenerate-bin-twinexisted only to append the protocol 1.1 twin without triggering that hazard. #47's drop-refusal guarded the destructive design instead of fixing it. The tool also reimplemented the ByteStorage envelope codec thattools/wire-format-reference.pyalready carries — two implementations of the exact encoding these fixtures exist to pin.Change
generatenow upserts by vector name: vectors the installed wheel reproduces are rebuilt (rewritten only if content changed), every other committed vector stays byte-untouched. Dropping a committed vector is structurally impossible, so the #47 drop-guard, both wheel-direction refusals, and thegenerate-bin-twinmode are deleted — the wheel's envelope encoding selects which default-path vector it rebuilds (bin wheel →_bintwin, legacy wheel → legacy original).wire-format-reference.py(stdlib-only, soverifystays dependency-free), with a generate-time check that the shared encoder reproduces the wheel's envelope byte-identically.generator; the top-level claim flips to an explicit mixed-provenance statement the first time a previously-unstamped vector is rewritten. A no-opgeneratenever rewrites the file.Expert panel (mandatory crypto/protocol gate) — run, findings applied
High-stakes 4-agent panel. 1 CRIT + 2 MAJ found, all fixed in
ad90a3f:decode_envelopesilently weakenedverify(old code required the0x94fixarray marker; anarray16-headed envelope passed both verifiers).verifynow requires byte-identical re-encode via the shared codec — strictly stronger than pre-refactor.verifypins declaredpayload_envelopefields against decoded bytes (previously Node-leg-only);generateprints which vectors it rewrote. Catchphrase agent: no cuts beyond one dead assert.Verification
test-vectors/python-frame.jsonbyte-unchanged by this PR (pure generator refactor).generateunder real cachekit 0.17.1: byte-identical, both with and without pyarrow (subset run leavesarrow_dataframe_writeuntouched — the acceptance proof that a wheel rebuilding only a subset preserves the rest).frame-crosscheck.mjstoo. The two verifiers remain fully independent —frame-crosscheck.mjsuntouched.int-arrayandbinobserved); twin guard refuses field drift and header-byte drift with named invariants; full localverify.ymlsuite green, includingpython -O.Docs
Tool usage text/docstring rewritten for the new modes;
generate-bin-twinhad no references in spec/README/CI (checked). CHANGELOG updated.spec/wire-format.mdneeded no change (documents the fixture + verify commands only, both unchanged).Out of scope per ticket: verifier merging, new vectors (width-boundary coverage is LAB-868), normative spec text.
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