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feat(stream): probe the ingest before going live — no more ghost broadcasts (TASK 32·5)

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"I forgot the VPN" used to create a broadcast on YouTube that nothing ever pushed to: the app looked
live, YouTube held an empty broadcast, and the creator had to work out what happened. Prevention beats
recovery here, so go-live now asks one question first.

- `Services/IngestProbe.cs` — `IIngestProbe` + `TcpIngestProbe`: parse the RTMP URL, connect to the host
  (rtmp → 1935, rtmps → 443) with a 2 s timeout. Any failure answers "not reachable"; the point is a
  fast unambiguous answer, not a diagnosis.
- `MainViewModel.IngestPreflightAsync` runs **before the first API call** whenever a cached ingest URL
  exists; on a first run it probes once the stream is resolved, still before any broadcast is created.
  A false answer logs, tells the creator ("Nothing was created on YouTube…"), and rolls the session
  back — nothing to clean up on YouTube.
- The probe is a test seam (`IngestProbeOverride`) like the camera and chroma ones.

Tests: `IngestPreflightTests` — unreachable aborts, reachable continues, URL parsing (rtmp/rtmps,
garbage), and the probe against **real sockets**: a listening port answers true, the same port closed
answers false and does so fast. FAST gate: 547 passed, 0 failed, 0 warnings.
This commit is contained in:
gramps
2026-11-05 14:56:20 -08:00
parent d8c1bdba24
commit ec1091a170
7 changed files with 243 additions and 3 deletions
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TASKS.md
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@@ -48,7 +48,7 @@ blocker; the smallest slice is 32·4 (fragmented MP4 on the record block).
| 55·2–3 | ☐ | Disk hygiene: delete `%TEMP%` alert clips on close + sweep at startup; low-disk guard before REC (slice 1 shipped) | [`task-55`](TASKS/task-55-disk-hygiene.md) |
| 40·A/C/D | ☐ | App Settings: active-camera picker; persist output resolution + surface transition defaults + confirm-before-End; accent consolidation | [`task-40`](TASKS/task-40-app-settings-round.md) |
| 3·20 | ☐ | RewardEvent persistence: canonical `RewardEvents` table + `superChatEvents.list` 30-day backfill (the session report and journey read it) | [`task-03`](TASKS/task-03-capture-pipeline.md) |
| 32 | 🔶 | Stream resilience: **fragmented MP4 + blip retry + poll-driven RECONNECTING done 2026-11-05** (no countdown — YouTube's cutoff is not a constant); remaining — one-click Back on air → ingest pre-flight | [`task-32`](TASKS/task-32-stream-resilience.md) |
| 32 | 🔶 | Stream resilience: **fragmented MP4 + blip retry + poll-driven RECONNECTING + ingest pre-flight done 2026-11-05** (no countdown — YouTube's cutoff is not a constant); remaining — one-click Back on air | [`task-32`](TASKS/task-32-stream-resilience.md) |
| 33 | ☐ | Bandwidth auto step-down: pure policy over dropped-frame rate, one-way within a broadcast | [`task-33`](TASKS/task-33-bandwidth-step-down.md) |
| 34 | ☐ | Scheduled streams (Text-drawer version) | [`task-34`](TASKS/task-34-scheduled-streams.md) |
| 35 | ☐ | Scene-linked audio | [`task-35`](TASKS/task-35-scene-linked-audio.md) |