feat(platform): add pipeline.Construct engine - #403
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## Summary - Introduces `platform/pipeline` with the typed `Construct[D]` engine - `Stage[D]` struct declares pipeline topology as a typed table (key, name, consumer group, controller constructor, optional DLQ) - Engine builds topic registry, creates primary + DLQ consumers, eagerly constructs all controllers, pairs DLQ stages automatically - Returns a `lifecycle.Component` for ordered start/stop - Options: `TopicNames`, `Classifiers`, `PublishOnly`, `ExtraComponents` - Pure addition — no existing code changes Step 2 of the [Modular Queue Wiring RFC](https://github.com/uber/submitqueue/blob/main/doc/rfc/submitqueue/modular-queue-wiring.md). Stacked on #402. ## Test plan - [x] 10 unit tests: single stage, DLQ pairing, multiple stages, empty stages error, controller creation failure, DLQ creation failure, publish-only topics, topic name overrides, resolveTopicName table test, dlqTopicKey, buildTopicConfigs - [x] `bazel test //platform/pipeline:go_default_test` passes - [x] `make gazelle` — BUILD.bazel in sync - [x] `make fmt` — code formatted Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Pass engine-produced values (TopicRegistry, TopicKey, ConsumerGroup) to Stage.New and Stage.DLQ via StageContext. Controllers need the registry for publishing to downstream stages and the topic key/group for their own identity — these are engine-owned, not host-provided Deps. DLQ StageContext automatically derives the DLQ topic key (appending "_dlq") and consumer group (appending "-dlq") from the primary stage's values. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Address review feedback: - ConsumerGroup is now documented as service-wide (e.g. "orchestrator"), not per-stage (e.g. "orchestrator-start"). - DLQ handler is now required on every stage — the queue infrastructure always creates a DLQ topic, so not processing it silently accumulates messages. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Pass the consumer gate through to both primary and DLQ consumers. Defaults to noop gate when not set. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
platform/pipelinewith the typedConstruct[D]engineStage[D]struct declares pipeline topology as a typed table (key, name, consumer group, controller constructor, optional DLQ)lifecycle.Componentfor ordered start/stopTopicNames,Classifiers,PublishOnly,ExtraComponentsStep 2 of the Modular Queue Wiring RFC. Stacked on #402.
Test plan
bazel test //platform/pipeline:go_default_testpassesmake gazelle— BUILD.bazel in syncmake fmt— code formattedCo-Authored-By: Claude Opus 4.6 noreply@anthropic.com
Issues
https://linear.app/uber/issue/CODEM-209/example-figure-out-a-better-structure-for-wiring-up
Stack