(MOT-3944) fix(queue): scope providers and deliveries by namespace

[guibeira]

Refs MOT-3944

Summary

• Replace the auxiliary default SDK connection with one project-scoped managed connection.
• Register queue provider functions in the worker namespace and preserve subscriber namespaces through builtin, Redis, and RabbitMQ delivery.
• Scope subscription deduplication and adapter identities by namespace, including adapter hot-swaps.
• Wait for worker registration before configuration RPCs and pin the Rust SDK packages to 0.23.0-rc.10.
• Add custom-namespace coverage for topic delivery, provider functions, DLQ/redrive, and TriggerAction::Enqueue.

Problem

The queue worker opened a project connection plus an auxiliary connection in default. Managed identity made those connections compete for the same worker lease. A custom namespace also routed provider functions and queued deliveries through default.

Behavior

queue worker (project namespace)
        |
        +-- queue/provider functions -> project-scoped connection
        |
        +-- subscriber namespace     -> preserved by every adapter
        |
        +-- target/condition call    -> subscriber namespace

A missing trigger namespace stays compatible with legacy traffic and resolves to default. The engine allowlist for scoped engine::queue::* providers is available in iii/v0.23.0-rc.10.

Validation

• cargo fmt --manifest-path queue/Cargo.toml --all -- --check
• cargo clippy --manifest-path queue/Cargo.toml --all-targets --all-features --locked -- -D warnings
• cargo test --manifest-path queue/Cargo.toml --all-features --locked --lib — 135 passed
• cargo test --manifest-path queue/Cargo.toml --tests --no-run
• Queue durability E2E against iii/v0.23.0-rc.10 — 3 passed
• Harness compose startup in a custom namespace — 14 of 14 workers ready

Related

• (MOT-3944) fix(engine,sdk): scope queue providers by namespace iii#2103
• (MOT-3944) fix(engine): allow namespaced queue provider registration iii#2112

Summary by CodeRabbit

• New Features

  • Added namespace-aware queue subscriptions and function delivery across supported adapters.
  • Preserved namespaces through retries, redelivery, condition checks, and dead-letter workflows.
  • Queue workers now use a managed project identity and support namespace-specific triggers.

• Bug Fixes

  • Improved consistency of namespace propagation during registration and resubscription.

• Tests

  • Expanded end-to-end coverage for namespaced delivery, durability, retries, redrive, and dead-letter handling.

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Project	Deployment	Actions	Updated (UTC)
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workers-tech-spec	Ready	Preview	Aug 31, 2026 7:22pm

[github-actions]

skill-check — worker

0 verified, 70 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.

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📥 Commits

Reviewing files that changed from the base of the PR and between 09916b8 and 84ef90a.

📒 Files selected for processing (1)

• queue/src/trigger.rs

🚧 Files skipped from review as they are similar to previous changes (1)

• queue/src/trigger.rs

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---

📝 Walkthrough

Walkthrough

The queue worker now propagates optional namespaces through subscriber registration, condition checks, and function delivery. Worker startup uses one managed project identity. Provider functions and end-to-end tests now use explicit namespace-aware registration and delivery.

Changes

Queue namespace flow

Layer / File(s)	Summary
Subscription contract and registration queue/src/adapter.rs, queue/src/trigger.rs, queue/src/configuration.rs, queue/src/runtime.rs	Queue subscription and invocation contracts now carry namespaces. Registration defaults missing namespaces to "default", escapes namespace-sensitive subscription keys, and preserves namespaces during resubscription.
Adapter delivery propagation queue/src/adapters/*, queue/tests/e2e_rabbitmq.rs, queue/tests/e2e_redis.rs	Builtin, memory, RabbitMQ, and Redis adapters pass namespaces to condition and target invocations. Adapter tests validate namespace delivery and update compatible call sites.
Managed worker registration and provider wiring queue/src/main.rs, queue/src/boot.rs, queue/src/functions.rs, queue/tests/common/engine.rs, queue/tests/e2e_durability.rs, queue/Cargo.toml	Startup uses one managed project worker with a registration timeout. Provider functions register through the project client. Durability tests add namespace-aware setup, readiness polling, DLQ checks, and provider-function coverage. Dependencies move to 0.23.0-rc.10.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: ⚪ Minimal · up to 84ef9

The change scopes queue providers and deliveries by namespace and includes targeted validation for custom namespaces and durability. No actionable merge-blocking risk remains beyond normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant QueueTriggerHandler
  participant QueueAdapter
  participant Invoker
  QueueTriggerHandler->>QueueAdapter: Register subscription with namespace
  QueueAdapter->>Invoker: Evaluate condition in namespace
  QueueAdapter->>Invoker: Deliver target function in namespace

Loading

Poem

A rabbit checks the namespace trail
Each queue keeps its proper detail
Conditions run in scoped array
Deliveries follow the same way
Managed workers greet the day

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 53.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 84 functions across 16 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: scoping queue providers and deliveries by namespace.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@queue/src/trigger.rs`:
- Around line 488-492: Update subscription identity handling around the
namespace field and subscription_key() so namespace participates in handler
deduplication and adapter subscription identity (or the internal queue name).
Ensure registrations with identical queue and function IDs in different
namespaces remain distinct, including hot-swap resubscription behavior.

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ℹ️ Review info

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: 0bb9e70e-d90a-49c0-a0c4-65f572dc4c77

📥 Commits

Reviewing files that changed from the base of the PR and between f631866 and 09916b8.

⛔ Files ignored due to path filters (1)

• queue/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (17)

• queue/Cargo.toml
• queue/src/adapter.rs
• queue/src/adapters/builtin.rs
• queue/src/adapters/memory.rs
• queue/src/adapters/rabbitmq/adapter.rs
• queue/src/adapters/rabbitmq/worker.rs
• queue/src/adapters/redis.rs
• queue/src/boot.rs
• queue/src/configuration.rs
• queue/src/functions.rs
• queue/src/main.rs
• queue/src/runtime.rs
• queue/src/trigger.rs
• queue/tests/common/engine.rs
• queue/tests/e2e_durability.rs
• queue/tests/e2e_rabbitmq.rs
• queue/tests/e2e_redis.rs

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