feat(codegen): generate the stanza tag and notification vocabularies - #1312
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Both were string literals: twelve `fn tag()` impls spread across the handler files, and eighteen arms in the notification dispatcher, two of which were hand-written `const &str`. That is the failure mode this repository already names in AGENTS.md and had not applied here -- a value renamed upstream leaves a match arm that still compiles, still reads correctly, and never matches again. The handler is not deleted, it is orphaned, and nothing says so. It is the same shape as the A/B gates fixed in #1311, one layer up. Both enums are now generated. Every one of the eighteen notification types this client dispatched on matches an IR type exactly, including the two constants, so nothing changed hands on the wire; nine more types the protocol carries are now visible as variants rather than as an unexplained fallback. The tag set is the union of three documents, not one. `notif` carries WA Web's dispatcher table, which omits `iq` (its request/reply layer owns that) and `ack` -- both tags this repository has handlers for. So the emitter also reads `srvreq` and `stanza`, and drops `privacy`, which is an outgoing type that never arrives. Taking the dispatcher table alone would have produced a list that reads as complete while asserting two of our own handlers cannot exist. Both are closed: neither call site wants to hold an unknown value, the router simply matches no handler, the dispatcher already forwards what it does not recognize as a raw event, and closed keeps `as_str()` returning the `&'static str` the handler trait is declared to return. `error` is emitted as `ErrorStanza` because a variant named `Error` collides with the associated type the `TryFrom` half of the derive declares, and the ambiguity is reported against the derive rather than the variant.
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WalkthroughThe code generator now emits ChangesWire vocabulary generation and integration
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR replaces hand-written protocol strings with generated vocabularies while preserving the existing dispatch behavior; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant IRIndexes
participant WhatspecCodegen
participant WireTags
participant NotificationHandler
IRIndexes->>WhatspecCodegen: provide notif, srvreq, and stanza indexes
WhatspecCodegen->>WireTags: generate typed wire enums
NotificationHandler->>WireTags: parse notification type
WireTags-->>NotificationHandler: return known variant or parse failure
NotificationHandler->>NotificationHandler: dispatch handler or raw event
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/notif.rs | Generates collision-checked stanza and notification enums from the three pinned IR domains, including explicit readable variant renames and outgoing-only filtering. |
| wacore/src/stanza/wire_tags.rs | Adds the generated closed wire vocabularies consumed by runtime routing and notification dispatch. |
| src/client/node_io.rs | Replaces top-level stanza literals in critical routing, inline scheduling, and ACK decisions with equivalent generated tag values. |
| src/handlers/notification/mod.rs | Converts notification dispatch to generated variants while retaining raw-event fallback for unsupported and unknown types. |
| tools/whatspec-codegen/src/source.rs | Adds the three vocabulary source documents to pinned acquisition and digest verification. |
| tools/whatspec-codegen/src/main.rs | Parses the added IR domains and emits the new committed wire-tags artifact. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart LR
IR["Pinned whatspec IR<br/>notif + srvreq + stanza"] --> Generator["whatspec-codegen"]
Generator --> Tags["StanzaTag"]
Generator --> Types["NotificationType"]
Tags --> Router["Top-level stanza routing"]
Tags --> Ack["ACK / NACK / retry gates"]
Types --> Notifications["Notification dispatch"]
Notifications --> Handlers["Typed handlers"]
Notifications --> Raw["Raw-event fallback"]
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In `@AGENTS.md`:
- Line 36: Update the generated-file guidance for wire_tags.rs to document that
its stanza-tag catalog excludes the outgoing-only privacy type, so maintainers
do not add privacy as a runtime tag. Keep the existing union-of-documents rule
and other generation guidance unchanged.
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AGENTS.mdsrc/handlers/basic.rssrc/handlers/call.rssrc/handlers/chatstate.rssrc/handlers/ib.rssrc/handlers/iq.rssrc/handlers/message.rssrc/handlers/notification/mod.rssrc/handlers/presence.rssrc/handlers/receipt.rssrc/passkey/flow.rstools/whatspec-codegen/src/emit/enums.rstools/whatspec-codegen/src/emit/mod.rstools/whatspec-codegen/src/emit/notif.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/stanza/mod.rswacore/src/stanza/wire_tags.rs
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The union rule was written down but the one exclusion was not, leaving the guidance reading as though every tag in every document is emitted. The reason matters more than the fact: privacy is the type of an outgoing stanza and never arrives under that tag, so listing it would invite a handler that can never fire.
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…clusion Three gaps review found. `processes_inline` and the media-reupload node filter still compared against string literals, so the migration was half done: an upstream respelling that kept the Rust identifier -- `stream:error` to `stream_error`, `mediaretry` to `media_retry` -- would regenerate the enum, keep compiling, and silently stop matching. Stream errors would skip inline classification and a media reupload would wait out its timeout. Both now go through the generated types. The `privacy` exclusion was applied to the merged set rather than to the outgoing document that motivates it. The claim being made is narrow -- that sending a `privacy` stanza is not evidence of receiving one -- but subtracting after the merge would also erase it if a later bundle listed it in the dispatcher table or among the server's requests, which is direct evidence that it does arrive. It is now filtered out of the outgoing contribution alone, with a test for each direction. And the dispatch comment restated the emitter's module doc almost verbatim, which is what this repository says not to do; the rationale stays at the point where the decision is made. Generated output is unchanged: --check still matches the pinned IR.
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The previous commit converted two sites and claimed they were the last; they were not. The primary receive path still compared raw tags in eight more places: the connection-critical gate, the deferred-ack decision, the direct-dispatch block, offline-sync tracking on `ib`, the `xmlstreamend` shutdown check and three `iq` gates. Those are the ones where a silent mismatch costs most. `ib` drives offline-sync tracking and `xmlstreamend` drives connection shutdown, and both spellings would survive a regeneration that renamed them -- `InfoBanner` and `XmlStreamEnd` are already the Rust identifiers, so the enum would not change and the literal would simply stop matching. Child-element lookups are deliberately left alone: `<reaction>` inside a newsletter message, `<audio>` and `<to>` inside a call, `<message>` inside a notification. Those name children, not the tag a stanza arrives under, and `StanzaTag` is only the second vocabulary. Reusing it there would assert a relationship the IR does not describe.
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Correcting something I said on the
The Deliberately left alone, with the reason: child-element lookups — Rather than claim completeness a second time, here is the check anyone can repeat: Validation on 8c73bba: Generated by Claude Code |
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| /// sends us, and the types this client sends: no one document lists | ||
| /// them all. | ||
| #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, crate::WireEnum)] | ||
| pub enum StanzaTag { |
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Fresh evidence beyond the earlier routing comments is that production ACK/NACK and retry paths still bypass this vocabulary: src/client.rs:1818 and 1974-1977, src/receipt.rs:423-425, and src/message/retry.rs:20 compare the same top-level tags or notification type as raw strings. If a generated wire attribute changes while its Rust variant is retained, receive routing will recognize the new spelling, but message ACKs can omit the required own-device JID, encrypt-identity ACKs can echo a forbidden type, and retry/NACK handling can reject the stanza. Route these gates through StanzaTag/NotificationType as well so the new attributes are actually the single source of truth.
AGENTS.md reference: AGENTS.md:L34-L34
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The last production comparisons, found by sweeping every non-test file in src/ for a literal that is a known tag or notification type rather than by grepping the files I expected: - client.rs: the receipt-participant check, the own-device-JID decision for `message`/`status` ack classes, the message-ack branch, and the `<notification type="encrypt"><identity/>` special case, which is the one place both vocabularies meet in a single condition - receipt.rs: the nack class gate - message/retry.rs: the retry-request stanza-class gate Left as they are, and why: child-element lookups (`<message>` inside a group notification, `<message>` inside a newsletter) name a child, not the tag a stanza arrives under, and `StanzaTag` is only the latter vocabulary. Test-only comparisons are also untouched, including a `vendor:thing` fixture in the plugin tests that deliberately is not a protocol tag.
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All four sites converted in d914e9c, plus two more the same sweep turned up. This is the third round of "there are more", so I stopped grepping the files I expected and instead swept every non-test file under
The The other four the sweep found are deliberately left, and I want to be explicit rather than silent about them:
The sweep is reproducible: walk Validation on d914e9c: Generated by Claude Code |
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Follow-up to #1311, replacing hand-written protocol strings with generated ones. Two vocabularies this client routes on were string literals; both now come from the bundle.
What was hand-written
fn tag()impls across 9 handler filesStanzaTag::X.as_str()const &strNotificationTypevariantsThat is the failure
AGENTS.mdalready names and this code had not applied: "parsers must dispatch on<Name>Tag::try_from(...)rather than string literals." A value renamed upstream leaves a match arm that still compiles, still reads correctly, and never matches again — the handler is not deleted, it is orphaned, and nothing says so. Same shape as the dead A/B gates in #1311, one layer up.The dispatch was already correct
Before generating anything I diffed our 18 notification arms against the IR's 27 types. All 18 match exactly — including
NOTIF_PASSKEY_REQUESTandNOTIF_PASSKEY_CONTINUATION, the two constants, which spellpasskey_prologue_requestandcrsc_continuationcorrectly. Nothing changed hands on the wire.The other 9 (
pay,psa,registration,server,waffle,w:growth,fb:update,hosted,digital_commerce_subscription) fall through to the raw-event arm exactly as before, but are now visible as variants rather than as an unexplained fallback.The tag set is a union, and that is the interesting part
notifcarries WA Web's stanza dispatcher table — 13 tags. Generating from it alone would have been wrong: it omitsiq, which goes through WA Web's request/reply layer, andack. This repository has handlers for both. A "complete" list missing them is worse than no list, because it reads as an assertion that they do not exist.So the emitter reads three documents and takes the union —
notif's dispatcher table,srvreq's incoming requests (iqappears only here), and the type of an outgoingstanza(ackappears only here). It then dropsprivacy, an outgoing-only type that never arrives, so nothing invites a handler that can never fire. Every one of our 12 handler tags is in the resulting set of 15.This is the
CallLinkMedialesson from #1310 applied ahead of time: a document that looks authoritative for a vocabulary may only cover one client's slice of it.Two decisions worth stating
Both enums are closed. Neither call site wants to hold an unknown value: the router simply matches no handler, and the dispatcher already forwards anything unrecognized as a raw event. Closed also keeps
as_str()returning&'static str, which is exactly whatStanzaHandler::tag()is declared to return — so the trait's contract is untouched and no public API moves.erroris emitted asErrorStanza. A variant namedErrorcollides with the associatedErrortype theTryFromhalf ofWireEnumdeclares, and rustc reports the ambiguity against the derive rather than the variant, which is a confusing place to land. The rename is in the emitter with that reason recorded.chatstate,ib,mediaretryandxmlstreamendare also renamed for readability (ChatState,InfoBanner,MediaRetry,XmlStreamEnd), following the existingmedianotify→MediaNotifyprecedent.Also
notif,srvreqandstanzaat the commit it already pins — no re-pin, no version change.wire_tags.rsis registered in the offline stamp check incommitted_artifacts.rsin the same commit, rather than being caught in review astargets.rswas.rust_strmoved from the enum emitter toemit/mod.rsso both emitters share one copy.Validation
Four new emitter tests cover the parts that could go wrong quietly: that the tag set really is the union of all three documents, that an outgoing-only type does not become a received tag, that colons and initialisms produce readable variants, and that two wire values colliding on one identifier stops generation instead of dropping a value.
The workspace commands exclude
whatsapp-rust-voip-cli, whosealsa-sysbuild script has no system dependency here.--skip-proto-descbecause this container has noprotoc; the.protois untouched. Semver Checks will be red on the same six pre-existingwaprotofindings as the last three PRs.Generated by Claude Code