UI-SP5 — Realtime SSE swap (view-free)#22
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1 additive backend SSE endpoint (GET /tasks/{id}/stream, hand-rolled
StreamingResponse, zero new dep, zero migration) + opt-in extension of
useLiveResource with streamUrl/applyEvent (additive; existing callers
unaffected) + ONE consumer (useTaskDetail) opts in. 9 other composables stay
polling = truly view-free. fetch+ReadableStream (Bearer-via-header) over
EventSource (would leak JWT via ?token query string). UI-SP4 AI-Copilot
deferred (v2.1 scope, requires full AI backend not implemented).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
M1 backend (openapi+config; SSE route+4 tests; gate). M2 frontend (parseSseChunk pure parser; streamSse+shouldStream; gate). M3 cutover (useLiveResource opt-in; useTaskDetail opts in; full gate + headed smoke + docs). Complete code, no placeholders; grounded in hf_proxy.py StreamingResponse idiom + post-SP3 on-disk state. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
BLOCKER (frontend): Vue 3.5 watch({immediate:true}) fires SYNCHRONOUSLY
before stopWatch is assigned → calling stopWatch() in the handler hits TDZ
when vue-query serves a cached snapshot synchronously. Fix: let stopWatch +
optional-call + started flag.
IMPORTANTs:
- Backend: yield b":open\n\n" first byte to defeat httpx 0.27.x ASGITransport
buffering (could hang the multi-snapshot test).
- Backend: replace hard-coded 447 baseline with record-then-add (SP3 added
extra tests since the baseline was estimated).
- Frontend: pollingFallback → ref(false) for Vue idiom clarity.
- Frontend: streamSse fast-fail on 403/404 (no point burning 7s of backoff).
- Frontend: parseSseChunk hasData flag preserves "0"/"" payloads (SSE-spec).
- Frontend: NEW streamSse happy-path / 401 / 404 unit tests (3 tests).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…s testability hatch for httpx ASGITransport)
…gate + happy-path tests
This was referenced May 20, 2026
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Summary
Web UI sub-project 5 of 5 (after UI-SP1 #19, UI-SP2 #20
de9573a, UI-SP3 #21a32f165). Delivers the locked "single-seam SSE swap, view-free" promise recorded multiple times across SP1/SP2/SP3:useLiveResourceinternals swap from polling to SSE, every view/page/other composable is unchanged.GET /api/v1/tasks/{id}/stream— hand-rolledtext/event-streamvia FastAPIStreamingResponse(same idiom ashf_proxy.py). 1 Hz default tick (envDLW_TASK_STREAM_INTERVAL_SECONDS, clamped[0.1, 10.0]). Proven cancel-pattern tenant gate (404 cross-tenant) + per-tick re-filter. Terminates on terminal task status, client disconnect, or controller shutdown.?max_ticks=Ntestability hatch (httpxASGITransportbuffers the body until generator close — needed for the multi-snapshot test).frontend/src/api/sse.ts(pureparseSseChunk+streamSsefetch+ReadableStream +shouldStreamgate);useLiveResourcegains optionalstreamUrl+applyEvent(additive — existing callers untouched);useTaskDetailopts in. 9 other composables stay polling.watch({immediate:true})fires SYNCHRONOUSLY beforestopWatchis assigned → TDZ if vue-query serves a cached snapshot) + 6 IMPORTANT (httpx ASGITransport buffering mitigation;pollingFallback→ ref; 403/404 fast-fail;parseSseChunkhasDataflag for"0"/""payloads; newstreamSsehappy-path/401/404 unit tests; baseline-record). All fixed in plan before code.Verification
--max-warnings=0; vite build success./tasks/<id>; live:open\n\ndata: <TaskDetail JSON>\n\nverified via direct curl on the ephemeral:8011controller with current SP5 code.useTaskDetail.spec.ts(SP1) andTaskDetailSP2.spec.ts(SP2 page) tests pass UNCHANGED.TaskDetail.vuewas NOT modified. 9 non-opted composables NOT modified.Known follow-ups (non-blocking, record-and-accept)
task_stream_interval_secondsclamping is runtime-only (Pydantic field has noge=/le=); a misconfigured env var would be silently capped at request time instead of failing fast at startup.pollingFallbackis one-way: once SSE gives up, the composable stays on polling for the lifetime of the consumer (tab refresh restores SSE) — documented inweb-ui.md.useTaskDetailroute-id reuse: same composable instance across task-id changes would stream the stale id; current router setup mounts fresh per route, so benign today.Test plan
🤖 Generated with Claude Code