Carlos Florêncio
87 lines
4.2 KiB
Markdown
87 lines
4.2 KiB
Markdown
---
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id: "02-replacement-turn-dispatch"
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title: "Orchestrate replacement-turn dispatch"
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status: done
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wave: 2
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depends_on: ["01-queue-send-now-claims"]
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plan: "plan.md"
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spec: "../../specs/ui/message-queue-send-now.md"
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---
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# Task 02: Orchestrate replacement-turn dispatch
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## Intent
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Compose the exact queue claim with Kandev's unified cancellation coordinator so
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Send Now safely replaces a captured busy turn or directly prompts an idle
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session without inheriting explicit Cancel workflow semantics.
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## Acceptance
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1. `message.queue.send_now` authorizes and dispatches exactly one selected entry
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or the exact bulk snapshot, returning the specified response/error contract.
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2. Busy dispatch uses backend cancellation progress but never writes the normal
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cancel message, moves to review, or evaluates cancelled-turn completion;
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promptable dispatch does not issue a cancel.
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3. Successor-turn, explicit-cancel, duplicate Send Now, queue-change, and prompt
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failure races fail closed or restore the original claim without a substitute
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FIFO dispatch.
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## Files likely touched
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- `apps/backend/internal/orchestrator/queue_send_now.go`
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- `apps/backend/internal/orchestrator/queue_send_now_test.go`
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- `apps/backend/internal/orchestrator/task_operations.go`
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- `apps/backend/internal/orchestrator/event_handlers_agent.go`
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- `apps/backend/internal/orchestrator/service.go`
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- `apps/backend/pkg/websocket/actions.go`
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- `apps/backend/internal/orchestrator/handlers/queue_handlers.go`
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- `apps/backend/internal/orchestrator/handlers/queue_handlers_send_now_test.go`
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- `apps/backend/internal/orchestrator/handlers/queue_handlers_test.go`
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- `apps/backend/internal/backendapp/gateway.go`
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## Dependencies
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- Task 01 exact queue claim, restoration, and acknowledgement contract.
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## Parallelism
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Sequential. It changes shared cancellation ownership and the public WebSocket
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contract used by Task 03.
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## Inputs
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- Spec: API Surface, State and Concurrency, Permissions, Failure Modes.
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- Plan: Backend / Non-completing cancel-and-dispatch and WebSocket action.
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- ADR: `2026-08-05-queue-send-now-replaces-turn`.
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- Existing patterns: `QueueAndInterruptForPeerMessage`,
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`cancelAgentSilentWithGuardActionKind`, `dispatchTakenQueuedMessage`, and
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`CancellationPendingSnapshot`.
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## Verification
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```bash
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cd apps/backend && go test -race ./internal/orchestrator ./internal/orchestrator/handlers -run 'SendQueuedNow|SendNow' -count=1
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```
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Also run the focused existing cancellation/peer-interrupt regressions affected
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by any shared coordinator edit:
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```bash
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cd apps/backend && go test -race ./internal/orchestrator -run 'Test(CancelAgent|CancellationSources|QueueAndInterruptForPeerMessage)' -count=1
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```
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## Output contract
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Report files changed, cancellation-source behavior, wire contract/error mapping,
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RED and GREEN test commands/results, race cases covered, blockers/risks, and
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synchronize this task plus `plan.md` status/results.
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## Results
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- Added `Service.SendQueuedNow`, the `message.queue.send_now` action, stable validation/error mapping, queue status publication, exact selected/bulk dispatch, and the dedicated non-completing cancellation kind.
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- Busy Send Now uses the backend-owned cancellation projection and captured-turn guard without joining explicit Cancel; promptable Send Now claims and prompts directly. Duplicate/cross-owner operations fail closed, and prompt/reset failures restore the complete claim.
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- GREEN: `cd apps/backend && go test -race ./internal/orchestrator -run 'SendNow|ExplicitCancellationDoesNotJoin' -count=1 -v` — 6 tests passed; handler coverage with `-run 'SendNow|QueueHandler'` — 24 tests passed; affected existing cancellation/peer-interrupt regressions — 56 tests passed.
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- PR fixup: carry the validated click-time source snapshot through cancellation and compare persisted queue fields before claiming; mark every source as `user_message_recorded` before prompt admission so ordinary and durable restoration cannot create duplicate transcript rows. Regression coverage includes changed-snapshot atomicity and a retry with a durable source.
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- The WS contract validates scope before dispatch and returns `{session_id, dispatched, sent_count}` on success, with stable queue-empty, queue-changed, conflict, turn-changed, attachment, and reference errors.
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