Checked the app's Emby-API assumptions directly against Emby's own
real OpenAPI spec (swagger.emby.media, pointed at a real server) after
a "watch status per user seems broken" report.
PlaystateService.reportProgress was wrong: POST
/Users/{UserId}/PlayingItems/{Id}/Progress does exist at that exact
path, but the spec declares PositionTicks/IsPaused as *query string*
parameters, not body fields - and a third parameter, MediaSourceId, is
*required* and wasn't being sent at all. The request body schema this
endpoint does list (Api.OnPlaybackProgress) covers unrelated fields
(PlaylistIndex/Shuffle/SleepTimerMode/...), none of these. So the
original guess sent PositionTicks/IsPaused somewhere Emby never reads
them, while omitting a parameter required just to accept the call -
almost certainly meaning every progress report was failing outright,
silently (best-effort by design, so nothing broke loudly).
Fixed: reportProgress now sends MediaSourceId/PositionTicks/IsPaused
as query parameters, no body at all. MediaSourceId comes from
PartyStreamService's own cache - CatalogService.negotiateStreamTarget
already resolves a real one for every party's shared stream
negotiation, so PartyStreamService now caches it alongside the target
path (negotiateStreamTarget's return type changed from a bare string
to {targetPath, mediaSourceId}) and exposes it read-only via a new
getCachedMediaSourceId(partyId) - deliberately passive, never triggers
a negotiation of its own, so a party where no one has started
playback yet this session simply has nothing to report; index.ts's
sweep skips it rather than paying for an extra PlaybackInfo round trip
every tick just for this.
While checking this, the other two flagged Emby-API assumptions (the
ffmpeg direct-stream URL, the /Playlists/{Id}/Items endpoint) were
re-checked against the same real spec too - both already correct, no
missing required parameter, consistent with them having been tried
for real successfully before.
Updated the 5 negotiateStreamTarget call sites in catalogService.test
to read the new {targetPath, mediaSourceId} shape, the 7
negotiateStreamTarget mocks in partyStreamService.test to return it
(plus 2 new tests: cache exposes mediaSourceId, a failed response
drops it too), rewrote playstateService.test's request-shape
assertions for query params instead of a body, and re-pointed
embyClient.test's generic body-encoding test at an arbitrary example
instead of implying it's still PlaystateService's real shape.
Verified: full typecheck/test/build (92/92 tests). docs/architecture.md
and README.md updated - the "Sync watch-party progress back to Emby"
section now documents the confirmed-wrong-then-fixed shape instead of
a standing TODO(verify), and README's "Not verified" paragraph moves
this (and the other two, now-confirmed) assumptions to "Resolved".
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This app has been read/proxy-only toward Emby so far. Queued right
after the playlist feature, asked for directly: while someone's in a
party, push their progress to Emby's own PlaystateService, so their own
Emby library (resume position, last-played state) stays in sync with
the watch/listen party, under their own account - not just the host's,
and not just this app's own memory of it.
Scoped to periodic progress reporting only for v1 - no explicit
start/stop calls (Emby's own "now playing" list won't show this app's
streams, and "mark fully watched" isn't guaranteed the way a clean Stop
near 100% would trigger it). Steady Progress calls alone already cover
the actual ask; wiring clean start/stop into every transition (item
change, leave, party destroy, a device takeover) is real complexity for
a secondary payoff - left as a documented follow-up.
- server/src/types.ts: PartyMember gains embyToken (null until known,
same shape as this session's own deviceId addition) - never sent to
the client, toPublicState's member mapping doesn't grow it.
- server/src/emby/EmbyClient.ts: fetch() now optionally takes
method/body (JSON-encoded once, here) - every existing GET-only call
site unaffected, both are optional.
- server/src/services/PlaystateService.ts (new): reportProgress(token,
userId, itemId, positionTicks, isPaused) - POSTs to
/Users/{userId}/PlayingItems/{itemId}/Progress. Catches and logs its
own failures (new Logger.playstate) rather than throwing - this runs
on a timer with nothing to catch a rejection, and one bad token or a
transient Emby hiccup must never touch real playback.
- server/src/services/PartyService.ts: new setMemberEmbyToken (records
a member's own token) and getCurrentPlaybackState (video: the host's
own tracked position - there's no per-follower tracking today, a
reasonable approximation given the player's own drift correction;
music: the one shared, server-authoritative position every member
already sees the same way). The one real piece of logic here is pure
and unit-tested on its own, same shape as this session's
absoluteToRelativeIndex/splitPlaylistByMediaType.
- server/src/realtime/SocketGateway.ts: attach()'s getSession callback
widened to expose embyToken - it was already being passed the full
EmbySession (AuthService.getSession), just typed down to {userId,
userName} before anything downstream could read the rest. The "join"
handler now also records member.embyToken alongside deviceId.
- server/src/index.ts: setMemberEmbyToken called after each of the 4
REST create/join call sites, so a member has a valid token from the
moment they're a member, not only once their socket first connects.
New ~20s setInterval (same shape as the existing removeIdleParties/
TranscodeService.reapIdleSessions timers): for every active party,
getCurrentPlaybackState once, then reportProgress for every connected
member with a known token.
- server/test/embyClient.test.ts, partyService.test.ts,
playstateService.test.ts (new): the new body-encoding path (and that
a plain GET stays untouched), getCurrentPlaybackState's video/music/
empty branches, setMemberEmbyToken, and that reportProgress's request
shape is right and a thrown failure never propagates.
- docs/architecture.md, README.md: design + the deliberate v1 scope and
the follower-position approximation spelled out.
No client changes - this is a pure server-side background process with
nothing for the browser to render or react to.
Verified: full typecheck+test+build on both projects (71/71 server
tests, 9 new). No Emby server is reachable from this dev environment,
so the actual endpoint/body shape is unverified end-to-end - flagged
explicitly in the docs, the third such Emby-API assumption this session
(after the ffmpeg direct-stream URL and the Playlists endpoint, both
fine once actually tried).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
