refactor(gateway): add the core feature registry, empty - #1188
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. WalkthroughChangesThe gateway now uses a manual core feature registry. Enabled features contribute routers, dashboard surfaces, and supervised workers from one build-time snapshot. Architecture checks restrict registry and entry-point discovery imports, and tests cover runtime and hybrid-mode behavior. Core feature packages
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Refactor Merge Risk: ⚪ Minimal · up to The feature registry introduces no active feature behavior in this change, and no actionable merge risk is identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@src/gateway/main.py`:
- Line 484: Update the package worker task creation around CorePackage.worker to
use a wrapper that logs unexpected exceptions immediately and re-raises
asyncio.CancelledError unchanged for clean shutdown; preserve the existing
package-name association and task behavior.
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AGENTS.mdARCHITECTURE.mdscripts/check_architecture.pysrc/gateway/AGENTS.mdsrc/gateway/api/main.pysrc/gateway/api/routes/bootstrap.pysrc/gateway/core/package.pysrc/gateway/main.pysrc/gateway/packages.pytests/unit/test_check_architecture.pytests/unit/test_deployment_bootstrap.pytests/unit/test_packages.py
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One note on the hybrid branch in hosted_surfaces, inline. Nothing blocking; the rest of the seam reads well and the worker supervision is right.
Posted by Claude Opus 5 via Claude Code.
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Approving. The seam is sound, the worker supervision is right, and the tests are unusually good for an empty registry.
One more note inline, on the enabled contract. It is a trap for later rather than a bug now, so it does not block. My earlier note on the hybrid branch in hosted_surfaces still stands.
Reviewed by Claude Opus 5 via Claude Code.
Adding a core feature today means editing a hand-kept list in each of several files: the router list, the surfaces tuple, the lifespan workers. Shipping one as a bootstrap plugin instead bends OTARI_BOOTSTRAP, which selects an edition and takes one value. Add a static registry of core feature packages, gateway/packages.py, and make the three wiring points read it: router registration mounts each enabled package's routers as core routes, the lifespan starts and stops its worker beside the refreshers under the same bound, and the deployment bootstrap publishes its surface. The registry is a literal tuple edited by hand; nothing is discovered and nothing registers itself on import. The registry is empty here, so this change has no behavior change. It is the seam the first package (budget alerts) lands in next. The architecture check learns three rules: a listed package may not import the registry, the entry point or the composition root; nothing outside a package imports its private modules (models excepted, for the metadata import list); and nothing under gateway/ imports importlib.metadata. Refs #1173.
A package worker that raised was noticed only at shutdown, where the supervisor inspects task outcomes. Wrap each worker so the failure is logged once, at the top of its task, when it occurs. Nothing awaits the task before shutdown, so the error is handled there rather than re-raised.
The spec settled on the layered shape for a core feature: one domain-named module per layer plus a registry entry, rather than a vertical package under gateway/. Rename the registry and its entry type to match (gateway/features.py, CoreFeature, CORE_FEATURES), and drop the boundary rules that only made sense for a package: the per-package layer rule and the private-module rule. What remains is the pair the seam needs: a service or a route may not import the registry, with the deployment bootstrap route as the one reader, and nothing under gateway/ imports importlib.metadata.
The hybrid arm of the bootstrap answered surfaces with its own empty literal, so the helper's hybrid branch never ran and its test asserted a path the endpoint does not take. The hybrid arm now calls the helper too, renamed published_surfaces because it answers for all three modes and "hosted" already names one of them. The hybrid test asks the endpoint rather than the helper.
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The routers were mounted from the answer create_app got, while the lifespan and the bootstrap asked again later, after stored dashboard overrides are applied. A feature whose switch the dashboard could change would then keep answering with no page, or show a page over a 404, and stay that way across a restart. create_app now records the enabled features on app.state and all three use that one answer, so the bootstrap route no longer reads the registry and needs no exemption from the architecture check. CoreFeature documents that a switch must be a setting the dashboard cannot change.
A feature whose surface repeats one the edition's fixed set holds is published twice today. The surfaces field is documented as the set of groups the deployment serves, so it should not carry duplicates.
published_surfaces now returns a set, so a feature that repeats a surface cannot duplicate it in the bootstrap answer. A test over the real registry makes that repeat, or two features sharing a name or a surface, fail in CI instead of being merged away quietly.
The standalone bootstrap test compared the endpoint's surfaces with published_surfaces, the helper the endpoint itself calls, so it could not fail. The registry is empty there, so the edition's fixed list is still the exact answer and stays an independent expectation.
The literal-tuple test rejects an inline CoreFeature(...) entry, but neither the registry nor the test said why, so the first person to add a feature would meet an unexplained failure. The registry docstring now states the convention and both assertions carry a message.
…very spelling A discovery import is reported today as a plain OSS base violation, which says nothing about the feature registry, and only importlib.metadata is caught. The tests now expect a message that names the rule and the importlib_metadata and pkg_resources spellings too.
A discovery import now fails with a message that names the rule and the reason (the feature registry is a literal tuple), instead of a bare OSS base violation that points a contributor at the overlay boundary. The ban also covers importlib_metadata and pkg_resources, the other two ways entry-point discovery is written, and AGENTS.md lists it.
…orker Feature workers stop under the refreshers' shared shutdown bound, and the warning for one that will not stop names it "probe refresher", a thing that does not exist. The test pins shutdown finishing and the warning naming a worker.
…e worker contract
The shutdown warnings appended "refresher" to every name, so an
abandoned feature worker was logged as a refresher. Each task now
carries its full label ("alias refresher", "<feature> worker"), and
the messages read the same as before for the refreshers.
Feature workers share the refreshers' stop bound, whose rationale
was that nothing a late tick could corrupt is left running. CoreFeature
now asks that of a worker: let cancellation through and leave no write
half done. It also says a worker that raises is logged once and not
restarted while the feature's routes and page stay up.
A hybrid gateway starts no feature worker, so the contract names the standalone and hosted modes rather than any serving app.
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Description
Today, adding a core feature to Otari means editing a hand-kept list in several files: the router list, the surfaces the dashboard shows, the background workers the lifespan starts. Shipping a feature as a bootstrap plugin instead misuses the bootstrap hook, which exists to select an edition and takes one value.
This PR adds a registry of core features: one literal tuple, edited by hand, that says which features this build ships. The app asks each listed feature once, when it is built, whether it is enabled, and router registration, the lifespan and the deployment bootstrap all use that one answer. A feature's switch is therefore a startup setting the dashboard cannot change. A listed feature mounts as core routes with no capability gate, runs its worker beside the existing refreshers, and publishes its dashboard surface when its own setting enables it. A worker stops under the refreshers' shared shutdown bound, and
CoreFeaturestates what that asks of it: let cancellation through and leave no write half done. A feature is one domain-named module per layer plus its registry entry, the same shape the rest of the core uses.The registry is empty in this PR, so nothing changes for anyone running Otari. It is the seam the first feature, budget alerts, lands in next (PR 2 of 3 for #1173).
The architecture check learns two rules so the seam stays what it is: a service or a route may not import the registry, so a feature cannot register itself (only the app wiring reads it, and the bootstrap route gets the enabled features from the app); and nothing under the gateway imports
importlib.metadata,importlib_metadataorpkg_resources, which is how entry-point discovery gets written. A violation of the second says that in its message.Churn on the two files this touches most, measured over 90 days as the epic asks:
main.pygoes from 47 commits to 48; the rest of the top five is unchanged.How to test it locally
What to look for:
GET /api/v1/bootstrapon a standalone gateway answers the same surface list as before. The newtest_features.pystands a probe feature in for a real one and checks that its route mounts, its surface is published, and its worker starts, stops, and reports a failure when it dies, each only when the feature says it is enabled. It also checks that a switch changed after the app is built moves none of the three, that a surface is published once even when a feature repeats it, and that a worker that will not stop is abandoned at shutdown and logged as a worker. The check-script tests cover the two new rules with synthetic files.Run locally: lint, typecheck,
make openapi-check,make postman-check, and the full unit suite (3628 passed). The 16 local failures come from this machine, not the change: a gitignored.envsets a master key and the shell exportsOTARI_API_KEY. The six affected files pass 145 of 145 in a clean checkout without either. The OSS smoke gate and the integration suite are left to CI.PR Type
Relevant issues
Part of #1173 (PR 1 of 3). Part of #1171.
Checklist
tests/unit,tests/integration).make lint,make typecheck,make test). Lint, typecheck, andmake test-unitran locally;make test-integrationis left to CI.uv run python scripts/generate_openapi.py). Not applicable: no route or schema changed.AI Usage
AI Model/Tool used: Claude Fable 5.1 and Claude Opus 5, through Claude Code.
Any additional AI details you'd like to share: The design and the step-by-step spec were written by Peter. Agents implemented the spec, wrote the tests, and ran the checks. The later commits apply review feedback: daavoo's comment on reading
enabledonce, and a multi-model review whose findings Peter asked to have fixed.Summary
This provides a controlled extension point for future core features without changing current deployments.
Technical notes
CoreFeaturedefinitions insrc/gateway/core/feature.py.