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5a7277523a
st-sync.js wrapped SyncManager but nothing drove it. The player now does: the
leader opens a new sync session on each advance, and every member — the leader
included — binds the video with attachVideo() on a NEW id only.
The leader binds from its own broadcast rather than at announce() time on
purpose. Starting when it announces would put it ahead of its followers by the
width of the network, which is the one desync nobody would think to look for
because the leader always looks correct.
Item selection stays clock-derived under both backends. Native sync replaces
only the seek/nudge drift correction, because setSyncParams has the element hold
its own alignment and correcting it ourselves would fight the platform — every
frame we moved is one it then has to undo. Keeping selection on the shared clock
is also what keeps images and widgets, which have no setSyncParams, advancing
with the videos instead of drifting off alone.
LEADER RULE: reuse the existing election (resolveGroupLeader) rather than adding
a column. It already resolves pinned-if-online, else first online member on the
shared playlist, else first by id — deterministic, stable, and already what the
group-sync payload reports. A second mechanism could only disagree with it.
Added on top: a group whose elected leader is OFFLINE falls back to our
protocol. Ours is leaderless and carries on; native sync has exactly one
broadcaster, so those members would sit waiting for an announcement that never
comes, with the dashboard showing a healthy group throughout.
device_groups.sync_backend ('auto'|'screentinker'|'brightsign') is the operator's
REQUEST; the answer comes from the existing pure resolveSyncBackend() so the
players, the dashboard and the stored setting cannot disagree. The resolved
backend, reason and downgraded flag ride in the group_sync payload and in the
group API, and the dashboard shows the refusal reason instead of a setting that
quietly isn't in force. An unrecognised value is rejected rather than stored,
because the resolver reads anything unknown as 'auto' — a typo would otherwise
return 200 and run a different protocol than the UI displayed.
FIXED WHILE HERE: the player re-entered group sync only when the group ID
changed, with a comment noting the clock protocol has no leader role. Native
sync has one, and neither a protocol switch nor leadership moving alters the
group id — so a player promoted to leader kept behaving as a follower, nobody
announced, and the group sat unsynchronised. The re-enter key now includes the
backend and the leader flag.
971 pass (+17).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uaeo9MvzKoyXuN6ZsbhtkL
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