From 8cfdfe987b6da74d2290654990978c4f51561de1 Mon Sep 17 00:00:00 2001 From: Lukas May Date: Wed, 4 Feb 2026 22:18:11 +0100 Subject: [PATCH] docs(20): complete plan 20-01 SSE streaming summary and state update --- .planning/STATE.md | 20 +-- .../20-01-SUMMARY.md | 124 ++++++++++++++++++ 2 files changed, 136 insertions(+), 8 deletions(-) create mode 100644 .planning/phases/20-real-time-subscriptions/20-01-SUMMARY.md diff --git a/.planning/STATE.md b/.planning/STATE.md index 20ebc7c..6196fab 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -9,19 +9,19 @@ See: .planning/PROJECT.md (updated 2026-02-04) ## Current Position -Phase: 19 of 21 (Agent Inbox) - COMPLETE -Plan: 4 of 4 in current phase -Status: Phase 19 complete -Last activity: 2026-02-04 - Completed 19-04-PLAN.md (Inbox Page Assembly) +Phase: 20 of 21 (Real-Time Subscriptions) - IN PROGRESS +Plan: 1 of 2 in current phase +Status: Completed 20-01 (SSE Streaming & Subscription Procedures) +Last activity: 2026-02-04 - Completed 20-01-PLAN.md (SSE backend) -Progress: █████████░ 98% +Progress: █████████░ 99% ## Performance Metrics **Velocity:** -- Total plans completed: 70 +- Total plans completed: 71 - Average duration: 3 min -- Total execution time: 197 min +- Total execution time: 201 min **By Phase (v1.0):** @@ -225,6 +225,10 @@ Recent decisions affecting current work: - 19-04: Detail panel inline in page file (not a separate component) — page-specific layout - 19-04: useUtils() for query invalidation on mutation success (same pattern as initiative detail) - 19-04: Serialize agent/message data to string dates for InboxList props (wire format consistency) +- 20-01: Queue + deferred promise pattern for bridging push (EventBus) to pull (async generator) +- 20-01: tracked() wrapper on each event for client-side reconnection via lastEventId +- 20-01: Fallback AbortSignal (new AbortController().signal) when opts.signal is undefined +- 20-01: Vite proxy works for SSE without changes (http-proxy streams chunked responses by default) ### Pending Todos @@ -247,5 +251,5 @@ None. ## Session Continuity Last session: 2026-02-04 -Stopped at: Completed 19-04 (Inbox Page Assembly) — Phase 19 complete +Stopped at: Completed 20-01 (SSE Streaming & Subscription Procedures) Resume file: None diff --git a/.planning/phases/20-real-time-subscriptions/20-01-SUMMARY.md b/.planning/phases/20-real-time-subscriptions/20-01-SUMMARY.md new file mode 100644 index 0000000..45b69fe --- /dev/null +++ b/.planning/phases/20-real-time-subscriptions/20-01-SUMMARY.md @@ -0,0 +1,124 @@ +--- +phase: 20-real-time-subscriptions +plan: 01 +subsystem: api +tags: [trpc, sse, subscriptions, async-generators, streaming, event-bus] + +requires: + - phase: 01.1-hexagonal-events + provides: EventBus port interface and EventEmitterBus adapter + - phase: 16-frontend-scaffold + provides: tRPC HTTP adapter and Vite proxy configuration + +provides: + - SSE streaming support in tRPC HTTP adapter + - Three subscription procedures (onEvent, onAgentUpdate, onTaskUpdate) + - EventBus-to-async-generator bridge (eventBusIterable helper) + - SubscriptionEvent type in shared package for frontend consumption + +affects: [20-02-frontend-subscriptions, 21-frontend-polish] + +tech-stack: + added: [] + patterns: [queue-based async generator for event bridge, tracked SSE for reconnection] + +key-files: + created: + - src/trpc/subscriptions.ts + modified: + - src/server/trpc-adapter.ts + - src/trpc/router.ts + - packages/shared/src/types.ts + - packages/shared/src/index.ts + +key-decisions: + - "Queue + deferred promise pattern for bridging push (EventBus) to pull (async generator)" + - "tracked() wrapper on each event for client-side reconnection via lastEventId" + - "Fallback AbortSignal when opts.signal is undefined (AbortController().signal)" + - "Vite proxy works for SSE without changes (http-proxy streams by default)" + +patterns-established: + - "eventBusIterable: Reusable async generator factory for any subset of EventBus events" + - "Subscription procedure pattern: input with optional lastEventId, yield* from eventBusIterable" + +duration: 4min +completed: 2026-02-04 +--- + +# Plan 20-01: SSE Streaming & Subscription Procedures Summary + +**tRPC SSE streaming via async generators bridging EventBus domain events to three subscription endpoints** + +## Performance + +- **Duration:** 4 min +- **Started:** 2026-02-04 +- **Completed:** 2026-02-04 +- **Tasks:** 2 +- **Files modified:** 5 + +## Accomplishments +- Fixed tRPC HTTP adapter to stream ReadableStream responses instead of buffering (required for SSE) +- Created subscriptions module with queue-based async generator bridging EventBus to tRPC subscriptions +- Added onEvent, onAgentUpdate, and onTaskUpdate subscription procedures to the router +- Exported SubscriptionEvent type from shared package for frontend consumption + +## Task Commits + +Each task was committed atomically: + +1. **Task 1: Fix HTTP adapter for SSE streaming and add subscription procedures** - `e5d8dbb` (feat) +2. **Task 2: Update shared types and verify SSE integration** - `42154d6` (feat) + +## Files Created/Modified +- `src/trpc/subscriptions.ts` - EventBus-to-async-generator bridge with tracked SSE events +- `src/server/trpc-adapter.ts` - Stream ReadableStream responses instead of buffering +- `src/trpc/router.ts` - Three subscription procedures (onEvent, onAgentUpdate, onTaskUpdate) +- `packages/shared/src/types.ts` - SubscriptionEvent interface for frontend +- `packages/shared/src/index.ts` - Re-export SubscriptionEvent + +## Decisions Made +- 20-01: Queue + deferred promise pattern for bridging push (EventBus) to pull (async generator) +- 20-01: tracked() wrapper on each event for client-side reconnection via lastEventId +- 20-01: Fallback AbortSignal (new AbortController().signal) when opts.signal is undefined +- 20-01: Vite proxy works for SSE without changes (http-proxy streams chunked responses by default) + +## Deviations from Plan + +### Auto-fixed Issues + +**1. [Rule 3 - Blocking] TrackedEnvelope type annotation** +- **Found during:** Task 1 (subscriptions module) +- **Issue:** `ReturnType>` is invalid TS — generic type inference on `typeof` of a generic function doesn't work +- **Fix:** Import `TrackedEnvelope` type directly from `@trpc/server` and use `TrackedEnvelope` as return type +- **Files modified:** src/trpc/subscriptions.ts +- **Verification:** `npm run build` succeeds +- **Committed in:** e5d8dbb (Task 1 commit) + +**2. [Rule 3 - Blocking] opts.signal potentially undefined** +- **Found during:** Task 1 (subscription procedures) +- **Issue:** `opts.signal` has type `AbortSignal | undefined` in tRPC subscription context, but eventBusIterable requires `AbortSignal` +- **Fix:** Fallback to `new AbortController().signal` when opts.signal is undefined +- **Files modified:** src/trpc/router.ts +- **Verification:** `npm run build` succeeds +- **Committed in:** e5d8dbb (Task 1 commit) + +--- + +**Total deviations:** 2 auto-fixed (2 blocking) +**Impact on plan:** Both auto-fixes necessary for type safety. No scope creep. + +## Issues Encountered +None + +## User Setup Required +None - no external service configuration required. + +## Next Phase Readiness +- Backend SSE streaming ready for frontend consumption +- Plan 20-02 can add httpSubscriptionLink to the tRPC client and wire subscription hooks +- All existing queries/mutations verified working (452 tests pass) + +--- +*Phase: 20-real-time-subscriptions* +*Completed: 2026-02-04*