feat(codegen): generate the protocol enums from the whatspec catalog - #1309
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whatspec published two IR upgrades that land the repository on schema 4.0.0. The `waVersion` is unchanged, so this is not a protocol resync: regenerating leaves every pre-existing artifact byte-identical, which the run reports as `unchanged` for all six. What the upgrade buys is an enum catalog that finally resolves. It grew from 328 entries to 403, every `enumRef` now points at one, `unknownValue` says whether the official parser rejects or nulls a value outside the set, and `bitPosition` marks the integer enums whose values are positions. Those were the three facts missing when the receive-path enums were written by hand. `StanzaMessageType`, `PollType`, `EncMediaType` and the receipt mode bits now come out of the catalog. The variants and values are the bundle's; the Rust identity is ours, declared in the emitter's `WANTED` table. Binding by `(module, name)` rather than name alone is load-bearing: 88 of the 403 carry a `syntheticName` whatspec builds from the variant values, so one added variant renames the entry, names repeat across modules, and 17 are proto-nested names `waproto` already owns. A variant added upstream now arrives on the next sync instead of waiting to be noticed, and `--check` fails if the tree disagrees. The emitted enums are semantically what they replaced, so no caller changed. The codegen's own fixtures now derive their schema version from the gate instead of spelling out a major that has to be chased on every bump.
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📝 WalkthroughSummary by CodeRabbit
WalkthroughThe codegen tool now reads enum catalog metadata and generates shared Rust wire enums and receipt-mode constants. Existing wacore types and retry handling use these generated definitions. ChangesWire enum generation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This change generates selected protocol enums from the catalog while preserving existing consumer paths and artifacts; the reported validation passes, so no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Catalog as enums/index.json
participant Codegen as whatspec-codegen
participant Artifact as wire_enums.rs
participant Wacore as wacore types and retry
Catalog->>Codegen: provide enum definitions
Codegen->>Codegen: resolve WANTED entries and validate values
Codegen->>Artifact: emit enums and receipt-mode masks
Artifact->>Wacore: provide shared public definitions
Wacore->>Wacore: re-export enums and receipt-mode constants
Possibly related PRs
Suggested labels: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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| Filename | Overview |
|---|---|
| tools/whatspec-codegen/src/emit/enums.rs | Adds guarded generation for selected string enums and receipt-mode masks, including ambiguity, synthetic-name, collision, and width checks. |
| tools/whatspec-codegen/src/ir.rs | Adds schema-4 enum-catalog IR types and raises the supported schema-major gate. |
| tools/whatspec-codegen/src/main.rs | Parses the enum catalog, registers its generated artifact, and derives test fixture versions from the supported schema. |
| tools/whatspec-codegen/src/source.rs | Adds the enum catalog to the fetched, verified, and version-checked IR inputs. |
| tools/whatspec-codegen/whatspec.lock.json | Re-pins whatspec and records the enum catalog alongside refreshed schema-4 document hashes. |
| wacore/src/types/wire_enums.rs | Contains generated equivalents of the three protocol enums and generated receipt-mode mask constants. |
| wacore/src/types/message.rs | Replaces handwritten enum definitions with re-exports that preserve existing consumer paths. |
| wacore/src/protocol/retry.rs | Re-exports the generated decrypt-failure receipt mask with its previous value, type, and module path. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart LR
Lock[whatspec lock] --> Source[Fetch and verify IR files]
Source --> Catalog[Parse enums/index.json]
Catalog --> Select[Resolve WANTED by module and name]
Select --> Validate[Validate shape, identity, and mask width]
Validate --> Generate[Generate wire_enums.rs]
Generate --> Reexports[Re-export through existing public paths]
Reexports --> Callers[Existing protocol callers]
Reviews (2): Last reviewed commit: "fix(codegen): reject a mask the generate..." | Re-trigger Greptile
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Inline comments:
In `@tools/whatspec-codegen/src/emit/enums.rs`:
- Around line 100-109: Remove the redundant Masks prefix configuration by making
the masks emitter derive its constant prefix from the existing rust field, or
otherwise establish rust as the single source of truth for the constant group.
Update the ReceiptModeBitPosition entry and the Shape::Masks definition/emission
logic accordingly, and remove the unused empty doc field if Masks does not
consume it.
- Around line 234-252: Validate each integer variant value in the enum emission
loop before constructing either shifted or unshifted expressions: require
shifted positions to be within the valid u32 bit range and require unshifted
values to fit u32 and be nonnegative, returning a contextual error that
identifies the module, enum, and variant. Update imports as needed for the
chosen error-context API, and keep valid constant generation unchanged.
- Around line 287-348: Replace positional WANTED indexing in the affected tests
with identity-based lookups using the existing entry names, including
wanted("POLL_TYPES") and wanted("ReceiptModeBitPosition"); update the remaining
WANTED[0] usage similarly. Ensure all tests such as
an_open_enum_gets_a_fallback_and_a_closed_one_does_not,
lookup_is_keyed_by_module_and_rejects_a_missing_entry,
a_synthetic_name_is_refused, and
bit_positions_are_shifted_and_plain_values_are_not select entries by name rather
than table order.
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AGENTS.mdtools/whatspec-codegen/src/emit/enums.rstools/whatspec-codegen/src/emit/mod.rstools/whatspec-codegen/src/ir.rstools/whatspec-codegen/src/main.rstools/whatspec-codegen/src/source.rstools/whatspec-codegen/tests/committed_artifacts.rstools/whatspec-codegen/whatspec.lock.jsonwacore/src/protocol/retry.rswacore/src/types/message.rswacore/src/types/mod.rswacore/src/types/wire_enums.rs
A bit position is an i64 from the catalog and went into a u32 const unchecked, so a position of 32 or a negative one would have surfaced as an overflow lint inside wire_enums.rs, pointing at the artifact instead of at the catalog entry that caused it. Both branches now bail in the generator, where the entry is still in hand. Shape::Masks also carried a prefix that was the rust field plus an underscore, and left doc unread, so two of the entry's fields were decoration and a reader had to open the emitter to learn which one the output used. The prefix is derived from rust now and the doc heads the group. Tests look entries up by name rather than by position in WANTED, which otherwise silently re-aims them when the table is reordered.
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Follow-up to #1308, which hand-wrote three receive-path enums and said in its own body why they could not be generated. whatspec has since published the two upgrades that remove every one of those reasons.
Summary
whatspec #44 and #45 land the bundle on schema
4.0.0. ThewaVersionis unchanged at2.3000.1044659339, so this is not a protocol resync: regenerating leaves all six pre-existing artifacts byte-identical. What the upgrade buys is an enum catalog that finally resolves, andStanzaMessageType,PollType,EncMediaTypeand the receipt-mode bits now come out of it instead of out of my judgement.What changed upstream, and why it matters here
#1308 argued generation was blocked, in its own words: "
STANZA_MSG_TYPESandPOLL_TYPESare not [in the catalog] -- they exist only inline asenumRefobjects", and "ReceiptModeBitPositionstores positions, so the1 << 2shift stays in hand-written code either way." Both are now false:enumRefs that resolveSTANZA_MSG_TYPES,POLL_TYPESunknownValue: "reject"/"null"per fieldbitPosition: trueSo the three facts I had to supply by hand are now in the bundle.
typeis"reject"andpolltypeis"null", which is exactly the closed-vs-fallback decision;ReceiptModeBitPositioncarriesbitPosition: true, so the shift is derivable.The
IqTargetfix in #44 also settles a question #1308 had to reason around. That PR observed everyw:g2stanza claimedtarget: "s.whatsapp.net"and inferred the group mixin overrides it. The catalog now resolves targets properly —makeReportMessagesRequestandmakeGetReportedMessagesRequestboth reportgroup_jid, in a distribution of 106s.whatsapp.net/ 26group_jid/ 6g.us/ 5unknown. The inference was right; nothing to change, but it is a fact now rather than an argument.The resync is a no-op for existing artifacts
Verified before writing any of this, by diffing the four documents this repo consumes between the pinned rev and the new one, ignoring the version stamp:
abprops(fields the emitter reads)appstatemextokensproto/WAProto.protoThe regeneration run agrees:
unchangedforversion/generated.rs,abprops.rs,mex_operations.rs,schemas.rs,tokens.jsonandwhatsapp.proto; only the newwire_enums.rsand the lock were written.Changes
SUPPORTED_SCHEMA_MAJOR2 → 4 and the lock re-pinned to631f76b. The gate refuses a bundle it cannot read, which is why this had to be deliberate rather than incidental.enums/index.jsonadded toIR_FILES, so it is fetched, hashed and locked like every other document.tools/whatspec-codegen/src/emit/enums.rsproducingwacore/src/types/wire_enums.rs, registered in the artifact list and in the offlinecommitted_artifactstest.StanzaMessageType,PollType,EncMediaTypemove fromtypes/message.rsto the generated module and are re-exported from their old path, so no consumer path changes.RECEIPT_MODE_HID_FAILED_DECRYPTinprotocol/retry.rsis now a re-export of the generated constant."2.0.0". Four of them broke on the bump — correctly, they were asserting the accept path with a version that had become unsupported — and hardcoding"4.0.0"would only move the same trap one bump down the road.No behaviour changed: the emitted enums are semantically identical to the ones they replace, down to
MediaNotifyandLiveLocation.Why
WANTEDinstead of emitting all 403The instinct is to emit everything and let dead-code elimination sort it out, and for size that instinct is right — this is what
abprops.rsalready does with 2090 flags. The blocker here is identity, not bytes:syntheticName: true— a placeholder whatspec builds by concatenating the variant values (ENUM_FALSE_TRUE,ENUM_1PSTICKER_AUDIO_...). Adding one variant upstream renames the entry, so a Rust type named after it renames on sync. That is a breaking change to public API every time the protocol grows a value.ACK,ENUM_LID_PN,EventTypeand most synthetic ones appear several times. A flat namespace cannot hold them, and picking first-wins would silently bind the wrong module's enum.MsgOpaqueData$PollContentType) thatwaprotoalready generates from the.proto. Emitting them again means two competing types for one thing.So the split is:
WANTEDbinds the Rust identity — name, shape, and the few variant spellings mechanicalpascal_casegets wrong — and the IR owns everything that can drift: which variants exist, what they carry, whether integers are positions. Adding an entry is one line.lookupis keyed by(module, name)and treats both a missing entry and an ambiguous one as fatal, so a rename upstream fails the build instead of silently emitting less.The emitter also refuses a synthetic name outright, which is the guard that keeps the reasoning above from being just a comment.
Cost
No new dependency.
wire_enums.rsis 142 lines. The generated file adds two constants nobody references yet (RECEIPT_MODE_ORPHAN,RECEIPT_MODE_NO_CHECKMARK_UX) — they areconst, so they materialize in a binary only where used, the same property that letsabprops.rsvendor 2090 flags for the dozen this client reads.Validation
--skip-proto-descbecause this container has noprotoc; the.protois byte-unchanged, so the descriptor cannot have moved.cargo clippy --workspacecannot complete here (alsa-sysfails its build script for want of a system package), so it is scoped to the three crates this touches. Full matrix left to CI.Generated by Claude Code