feat: persist and surface each worker's task registry - #707
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Adding a field to WorkerRegistration or the hello frame is a major release today. Both are designed to grow, so mark them non_exhaustive and give the two types external crates construct a builder to build with.
Discovery makes a worker's registry implicit, and an unregistered task name is a fatal failure — so a worker that imported part of its task tree dead-letters everything for the rest in silence. Attached executors are covered by the hello comparison; in-process workers, where discovery actually runs, were not.
The value now crosses an SDK boundary through a storage column, so the algorithm is contract material. Pins the vectors a re-implementation gets wrong — the framing pairs and the newline case — and asserts them here too.
Read off the very dict the dispatcher looks task names up in, so the row cannot advertise a task set this worker will not run.
WorkerOptions gains tasks: taskConfigs carries only the tasks given a policy, so a registry read off it would omit every task that took the defaults.
WorkerOptions gains tasks: taskPolicies carries only the tasks given a retry policy, so a registry read off it would omit every task that took the defaults.
A hash means nothing until it is compared against its peers, so the column badges the fingerprints the fleet does not agree on rather than printing all of them the same. A tie for largest flags every group: a split fleet has no intended registry to clear the other half against.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR defines a cross-SDK task-registry fingerprint contract, persists optional worker fingerprints, propagates them through Java, Node, and Python integrations, exposes them in worker APIs, and adds dashboard divergence detection. ChangesWorker registry fingerprint
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Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟠 High · up to This PR adds worker registry fingerprints across storage, SDKs, the dashboard, and release automation, but the current version still risks breaking Java consumers, incorrectly flagging valid worker-role differences, and allowing mutable release automation to run with elevated permissions. These issues should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant SDKWorker
participant CoreFingerprint
participant WorkerStorage
participant DashboardAPI
participant WorkersTable
SDKWorker->>CoreFingerprint: hash registered task names
CoreFingerprint-->>SDKWorker: optional fingerprint
SDKWorker->>WorkerStorage: register worker with fingerprint
WorkerStorage-->>DashboardAPI: return worker fingerprint
DashboardAPI-->>WorkersTable: render worker registry values
WorkersTable->>WorkersTable: identify non-majority fingerprints
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✅ Passed checks (4 passed)
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Inline comments:
In `@crates/flexiq-core/BINDING_CONTRACT.md`:
- Around line 217-219: Add a fixed UTF-8 ordering vector covering BMP name
"\u{e000}" and non-BMP name "\u{10000}" to
crates/flexiq-core/BINDING_CONTRACT.md:217-219. In
crates/flexiq-core/src/worker/fingerprint.rs:175-191, assert the vector and its
reversed-input equivalent, then add the same assertions to every SDK binding
suite.
In `@crates/flexiq-core/src/worker/runner.rs`:
- Around line 174-179: Update the fingerprint computation in the worker setup
around registry_fingerprint so a supplied dispatcher does not fingerprint unused
registered handlers. When dispatcher is Some, persist no registry fingerprint;
retain the existing registry_fingerprint(registry.task_names()) behavior only
when the worker uses its own registry.
In `@dashboard/src/features/workers/utils.ts`:
- Around line 28-45: Update divergentFingerprints to group workers by their
canonicalized queues before counting registry_fingerprint values, so
fingerprints are compared only among workers eligible for the same jobs. Select
the majority fingerprint independently within each queue group and return the
union of divergent fingerprints across groups, preserving tie and
insufficient-count behavior per group. Add coverage for independent queue
groups.
Apply the same fix in `@dashboard/src/features/workers/utils.test.ts` around lines
23 - 67: Add coverage proving independent worker-role groups are evaluated
separately.
In `@sdks/java/src/main/java/org/byteveda/flexiq/model/WorkerInfo.java`:
- Around line 52-53: Restore the previous 14-argument public WorkerInfo
constructor overload and have it delegate to the new 15-argument constructor
with registryFingerprint set to null, while preserving the existing constructor
behavior for callers that provide a registry fingerprint.
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crates/flexiq-core/BINDING_CONTRACT.mdcrates/flexiq-core/migrations/m0012_worker_registry_fingerprint.rscrates/flexiq-core/src/lib.rscrates/flexiq-core/src/storage/models.rscrates/flexiq-core/src/storage/records.rscrates/flexiq-core/src/storage/redis_backend/workers.rscrates/flexiq-core/src/storage/schema.rscrates/flexiq-core/src/storage/sqlite/tests.rscrates/flexiq-core/src/worker/fingerprint.rscrates/flexiq-core/src/worker/mod.rscrates/flexiq-core/src/worker/protocol.rscrates/flexiq-core/src/worker/remote.rscrates/flexiq-core/src/worker/runner.rscrates/flexiq-core/tests/attach_auth.rscrates/flexiq-core/tests/rust/executor_tests.rscrates/flexiq-core/tests/rust/remote_tests.rscrates/flexiq-core/tests/rust/storage_tests.rscrates/flexiq-core/tests/rust/worker_tests.rscrates/flexiq-java/src/convert.rscrates/flexiq-java/src/worker.rscrates/flexiq-node/src/config.rscrates/flexiq-node/src/convert/stats.rscrates/flexiq-node/src/worker.rscrates/flexiq-python/src/py_queue/inspection.rscrates/flexiq-python/src/py_queue/worker.rscrates/flexiq-server/src/dashboard/dto.rscrates/flexiq-server/tests/attach_e2e.rsdashboard/src/features/workers/components/workers-table.tsxdashboard/src/features/workers/utils.test.tsdashboard/src/features/workers/utils.tsdashboard/src/lib/api-types.tsdocs/content/docs/python/api-reference/queue/workers.mdxdocs/content/docs/python/api-reference/worker.mdxdocs/content/docs/python/guides/dashboard/index.mdxsdks/java/src/main/java/org/byteveda/flexiq/dashboard/api/Contract.javasdks/java/src/main/java/org/byteveda/flexiq/model/WorkerInfo.javasdks/java/src/main/java/org/byteveda/flexiq/worker/Worker.javasdks/java/src/test/java/org/byteveda/flexiq/worker/WorkerRegistryFingerprintTest.javasdks/node/src/dashboard/handlers/contract.tssdks/node/src/worker.tssdks/node/test/worker/registryFingerprint.test.tssdks/python/tests/worker/test_worker_registry_fingerprint.py
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register() plus dispatcher() is legal and silently drops the handlers, so the row advertised a task set the worker cannot execute — false divergence from the one column that exists to make divergence visible.
Every pinned vector was ASCII, which UTF-8 and UTF-16 order identically, so a re-implementation that sorted by UTF-16 code units passed all of them.
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Inline comments:
In `@crates/flexiq-core/BINDING_CONTRACT.md`:
- Line 209: Update the binding-contract table description near the newly added
row to explicitly name the two collision pairs, rather than describing them by
relative row positions or as the last four rows.
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Adding the non-BMP row made "the last four rows are two pairs" false. Naming each row keeps the prose correct as the table grows.
pratyush618
previously approved these changes
Aug 20, 2026
A branch still declares the released version, so semver-checks reads every breaking change there as a broken patch; the release is where a version number exists to be judged against.
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Inline comments:
In @.github/workflows/publish-crates.yml:
- Around line 168-170: Update the cargo-semver-checks action reference in the
publish workflow to the immutable commit
6b69fcf40e9b5fb17adeb57e4b6ecd020649a239, while retaining the # v2.9.0 version
comment and existing package input.
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The release job holds a crates.io OIDC identity and a contents:write token, so nothing in it should ride a mutable tag.
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Summary
workersrow, so theone host in a fleet that discovered a different set of tasks is visible from the registry
instead of by going host by host. worker protocol: registry fingerprint in the hello handshake #661 landed this check for attached executors; in-process
workers never speak that protocol, and they are where Deferred task registration and autodiscovery #657's
@task+Queue.autodiscoverdiscovery actually runs.
#[non_exhaustive]on the five public types that grow every time theprotocol or the registry does, so the next additive change to any of them is a minor.
BINDING_CONTRACT.md. Once the value lands ina storage column it crosses an SDK boundary and becomes contract material.
Closes #704.
Changes
Rust core
0012_worker_registry_fingerprint— nullable text onworkers, same shape as0009_worker_sdk, idempotent on both SQLite and Postgres.WorkerRegistrationandWorkerInfogainregistry_fingerprint;NewWorkerRow::joiningandFrom<WorkerRow>carry it; the Redis backend hsets it on register and reads it inlist_workers.Worker::spawncomputes it fromTaskRegistry::task_names(), taken before the registry movesinto the dispatcher. A caller that supplies its own pool keeps its handlers on its own side, so
that registry is empty and fingerprints as
None— the row must not claim a registry thisprocess cannot see.
worker::fingerprintgoes frompub(crate)topuband is re-exported: the sibling SDK cratescall it.
Public API hardening
#[non_exhaustive]onExecutorMessage,SchedulerMessage, theExecutorMessage::Hellovariant,
AttachedExecutor,WorkerRegistrationandWorkerInfo.ExecutorMessage::hello(id, sdk, version, tasks, slots)returns aHelloBuilder;protocol_versiondefaults toPROTOCOL_VERSIONandtokentoNone, both overridable.WorkerRegistration::new(worker_id, queues, threads)plus one setter per optional field.Required is what a correct worker cannot omit; everything else is something a shell may not know
about itself.
SDK registration paths
row cannot advertise a task set the worker will not run.
queue.workers()exposes the key.taskson theirWorkerOptionsand pass their handler names.taskConfigs/taskPoliciescarry only the tasks that were given a policy, so a registry readoff either would omit every task that took the defaults.
Dashboard
dto.rsandapi-types.tscarry the field; a Registry column badges the fingerprints thatare not the fleet's agreed-on one. A hash means nothing until it is compared against its peers,
so the column does the comparing: the largest group is the intended registry, and a tie flags
every group — a split fleet has no side to clear.
workerstable itself. A heterogeneous fleet is normal there — oneworker serves
email, another servesvideo— so a blanket warning would be noise.Docs
BINDING_CONTRACT.mdgains a Registry fingerprint section: the algorithm, eight vectors, and whyeach choice is what it is. The last four rows are two pairs that collide under an encoding which
concatenates or separates instead of length-prefixing.
Notes for review
The two stale things in the design that predate this branch, both corrected. A full
implementation was written while #661 was in progress and parked. It carried a
Hello.registry_fingerprintwire field, which #661 replaced with derivation from thetasks[]already on the frame — dropped, since a second copy of the same fact is free to disagree. And every
vector on it predates the length-prefixed encoding review of #703 introduced:
{invoices.send, reports.build}isfafd30ef8ebcb7de, not91df0f7323f38326. Recomputed againstan independent implementation before pinning, and the Python, Node and Java tests each assert that
same constant, which is the point of having it.
Semver, for whoever cuts the release.
cargo semver-checks check-release -p flexiq-corereports three major lints, all of them the
#[non_exhaustive]markers:enum_marked_non_exhaustive,enum_variant_marked_non_exhaustive,struct_marked_non_exhaustive.Notably not
constructible_struct_adds_field—#[non_exhaustive]subsumes it, which is exactlythe trade: this is the last additive change to these types that costs a major.
flexiq,flexiq-workflowsandflexiq-meshreport no update required. No version string is touched here;the release decides the number.
Test plan
cargo fmt --all --checkcargo clippy --workspace --all-targets -D warnings— default,postgres,rediscargo test --workspace, and the doctest on the newhellobuildercargo test --workspace --exclude flexiq-python --features postgres,workflowsagainst a livePostgreSQL —
postgres_storage_testscovers the new columncargo test --workspace --features redis,workflowsagainst a live Redis —redis_storage_testslikewisepytest tests/1505 passed / 12 skipped;ruff check,ruff format --check,mypyclean over 328 filespnpm test746 passed / 6 skipped;tscandbiomeclean./gradlew build— 582 tests, 0 failurespnpm run ci(biome + tsc + vitest + build) — 151 tests/api/workersbyte parity between the Python dashboard andflexiq-server— 30 passedNew coverage: the migration rewind and its idempotence; the storage contract across all three
backends, including that a shell reporting no registry reads back as absent rather than
""; aworker recording its fingerprint and a worker with nothing registered recording none; the contract
vectors; one registration test per SDK; six dashboard unit tests for the divergence rule.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation