screentinker/server
ScreenTinker 5b069b9665 Probe video asynchronously — the sweep would have blocked the loop per file
The backfill is right, and it lands on a path that could not carry it yet.

deriveMediaMetadata spawned ffprobe and ffmpeg with execFileSync, each with a
15s timeout. Synchronously, those two calls stop the whole server for their
duration: no heartbeats, no socket traffic, no HTTP. That was survivable while
the only caller was a human-initiated upload — one file, someone waiting on it,
bounded by their patience.

The boot-time sweep removes every one of those mitigations. It walks the entire
library, unattended, on a server with live panels, once per boot. A library of
video rows therefore becomes a per-file event-loop stall, which is #240's
failure mode — blocked loop, missed heartbeats, panels marked offline,
reconnect churn — arriving from our own maintenance instead of from a
checkpoint. We spent yesterday removing one of those; this would have added
another, on a schedule.

So both spawns are awaited instead of blocked on. Both callers already awaited
deriveMediaMetadata, so this is invisible to them, and the ingest path stops
freezing the server for the length of an upload's probe as a side benefit —
that sync ffprobe has been known tech debt for a while.

Timeouts are unchanged and still asserted: async is not a licence to hang, or
one wedged file stops the sweep dead instead of moving on.

Also applied the PR's own phantom-path discipline to the video branch, which
still named its thumbnail before the encode: a failed ffmpeg left the row
claiming a file that was never written, which is the exact bug the image branch
was fixed for two commits earlier.

The new test measures the property rather than grepping for it — a timer keeps
ticking across a real spawn — so a future edit that reintroduces a sync call
fails here rather than in a customer's fleet.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014skWYXJUWhF73EvNPgB2AS
2026-08-07 08:42:34 -05:00
..
config fix(logging): gate CF-Connecting-IP on a Cloudflare peer, not any trusted proxy 2026-07-26 10:23:04 -05:00
db Show a panel's IPv6, and size the pairing code to the screen it is on 2026-08-07 08:06:45 -05:00
lib Probe video asynchronously — the sweep would have blocked the loop per file 2026-08-07 08:42:34 -05:00
middleware Merge branch 'fix/recovery-grants' into release/auth-campaign 2026-07-26 16:22:59 -05:00
player Show a panel's IPv6, and size the pairing code to the screen it is on 2026-08-07 08:06:45 -05:00
routes Show a panel's IPv6, and size the pairing code to the screen it is on 2026-08-07 08:06:45 -05:00
scripts fix(content+android): rotation-aware media — portrait upright on dashboard AND player (#170) (#172) 2026-07-12 22:05:11 -05:00
services #240: stop the morning wave buying itself a blocking checkpoint 2026-08-06 20:22:21 -05:00
test Probe video asynchronously — the sweep would have blocked the loop per file 2026-08-07 08:42:34 -05:00
ws Show a panel's IPv6, and size the pairing code to the screen it is on 2026-08-07 08:06:45 -05:00
.gitignore feat(email): Microsoft Graph send + alert spam protection + preferences UI 2026-05-12 18:16:40 -05:00
config.js #240: stop the morning wave buying itself a blocking checkpoint 2026-08-06 20:22:21 -05:00
package-lock.json chore(release): v1.9.31 2026-08-06 21:08:14 -05:00
package.json chore(release): v1.9.31 2026-08-06 21:08:14 -05:00
server.js Backfill missing thumbnails at boot, and say when ffmpeg is absent 2026-08-07 09:30:32 +01:00
smoke-ui.js Keep the smoke test out of npm test, and update the lockfile 2026-07-28 20:34:34 -05:00
version.js chore(version): single-source VERSION, env-configurable data paths, bump tooling 2026-06-10 12:56:03 -05:00