Waters ChurchandClaude Opus 4.8
7e75146838
The LTC card repainted only on server anchors (~4x/s), so the frame counter jumped in ~7-frame steps. Now the client counts every frame locally between anchors and re-syncs on each one — frame-accurate and smooth, with no extra network traffic. - Server anchors carry ageMs (how old the decoded timecode is) so clients can pin the anchor to their own clock. ltc-listener reports it while running; composeLtc passes it through (listener) or derives it (reader). - Client does exact SMPTE frame<->timecode math (parseTc/tcToFrames/ framesToTc, incl. 29.97 drop-frame minute counting) and advances the display in a requestAnimationFrame loop at the LTC's own rate. - Robust when rAF is throttled (backgrounded tab): render() paints the extrapolated frame at the 4x/s anchor rate too, so the display never freezes — the rAF loop only refines it to every frame when visible. - Anchor jitter can't tick the counter backwards (small regressions clamped; genuine seeks/re-strikes pass); freshness cap stops freewheel into phantom frames when anchors stop arriving. Verified: SMPTE math against the encoder over 200k drop-frame frames plus round-trips; the extrapolation pipeline simulated at 30/25/29.97DF showing strict +1-per-frame advance and correct DF boundary crossing. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
622 lines
25 KiB
JavaScript
622 lines
25 KiB
JavaScript
'use strict';
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/**
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* ProPresenter Timers — server part.
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*
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* Polls the ProPresenter openAPI for the configured timer list, the live
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* timer values, and (when the connected build exposes it) LTC timecode, and
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* fans one merged state object out to every tile over SSE. Browsers never
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* talk to ProPresenter directly.
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*
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* GET /state → { state: <state> } (instant paint for new tiles)
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* GET /stream → SSE, `state` events (change-detected, heartbeated)
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* POST /ltc → remote LTC ingest: tools/ltc-reader.js on another
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* machine reports { state, time, fps, df } here.
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* GET /ltc/devices → this machine's audio input devices, for the admin
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* page's device picker (select + optionsRoute).
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*
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* Endpoints used, verified against openapi.propresenter.com (API v1):
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* GET /v1/timers → [ { id:{uuid,name,index}, allows_overrun,
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* countdown:{duration} | count_down_to_time:{time_of_day,period}
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* | elapsed:{start_time,end_time} } ]
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* GET /v1/timers/current → [ { id:{uuid,name,index}, time:"HH:MM:SS", state } ]
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* `time` may be negative ("-00:00:02") while overrunning, and some builds
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* append hundredths ("00:00:01.00" appears in the spec's schema example).
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* `state` enum is stopped|running|complete|overrunning|overran — but the
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* spec's own response example says "overrun", so treat anything containing
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* "overr" as overrun. The API exposes NO per-timer color anywhere.
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* GET /v1/timecode/status → NOT in the published spec. The spec (fetched
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* 2026-08, 0 mentions of "timecode", not in the /v1/status/updates
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* allowlist either) documents no timecode/LTC route at all — verified
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* live: ProPresenter 21.4 returns 404. We probe this candidate route
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* once per connection anyway so a future ProPresenter that adds it
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* lights up without a module update.
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*
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* Because the HTTP API has no timecode, LTC comes from the audio signal
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* itself. The whole LTC feature sits behind the admin "LTC listener"
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* switch — off means no LTC tile in the picker, no probes, and the ingest
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* route answers 409. When on, the sources in precedence order:
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* 1. the built-in listener (ltc-listener.js — this machine captures the
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* admin-selected device/channel and decodes in-process) while it has
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* actual data;
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* 2. a fresh remote reader report (POST /ltc, tools/ltc-reader.js on the
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* machine that can hear the LTC when this one can't);
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* 3. the listener's own "no signal" verdict (healthy capture, silent
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* feed — believed over the indirect sources below);
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* 4. the HTTP timecode route if some future ProPresenter answers it;
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* 5. a stage-display field labeled "LTC" (see stage-ws.js).
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*
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* ProPresenter's built-in HTTP server is easily overwhelmed (see the hot-path
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* notes in ../propresenter-now-next/propresenter-core). So: requests run
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* strictly sequentially, the next tick is scheduled only after the previous
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* one finished, live values are the only every-tick call, and the timer list
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* rides a slow lane. The endpoints do offer `?chunked` streaming, but polling
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* matches how propresenter-core survives real-world ProPresenter quirks.
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*/
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/** Hot-path cadence — live timer values. */
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const POLL_MS = 500;
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/** Backoff while ProPresenter is unreachable. */
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const RETRY_MS = 2500;
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/** The configured-timer list refreshes every Nth tick (~2s at 500ms). */
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const SLOW_EVERY = 4;
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/** Abort a hung request well before it can stall the loop for good. */
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const REQUEST_TIMEOUT_MS = 4000;
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/** SSE comment ping cadence — keeps idle connections alive through sleepy Wi-Fi. */
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const HEARTBEAT_MS = 15000;
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/** A reader report older than this no longer speaks for the LTC feed —
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the reader posts at least 1×/s, so 6s of silence means it died. */
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const INGEST_STALE_MS = 6000;
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const { spawn } = require('child_process');
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const { createStageLtcClient } = require('./stage-ws');
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const { createLtcListener } = require('./ltc-listener');
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/** Set by init(), read by the routes — both are rebuilt together on remount. */
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let current = null;
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function clearedState(enabled, ltcEnabled = false) {
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return {
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enabled,
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ltcEnabled,
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reachable: false,
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lastError: '',
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timers: [],
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// supported: null = no verdict yet (probing, or ProPresenter
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// unreachable); true once a timecode source is live; false when every
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// source came up empty (note says why, when we know). status is the
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// richer verdict (running|stopped|nosignal); fps/df only when the
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// source knows them (the reader decodes both from the LTC bits).
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ltc: { supported: null, time: '', receiving: false, status: '', fps: 0, df: false, source: '', note: '' },
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};
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}
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module.exports = {
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init({ config, log }) {
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const streams = new Set();
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// Endpoint config. Legacy flat host/port keys (saved before the endpoint
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// field existed) can only still be present until the admin form is
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// re-saved, so when they exist they win over the endpoint's default.
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const ep = config.propresenter && typeof config.propresenter === 'object' ? config.propresenter : {};
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const host = String(config.host ?? ep.host ?? '');
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const port = Number(config.port ?? ep.port) || 1025;
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const password = String(config.password || '');
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const enabled = Boolean(host && port);
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const ltcEnabled = Boolean(config.ltcEnabled);
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const ltcDevice = String(config.ltcDevice || '');
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const ltcChannel = Math.max(1, Math.trunc(Number(config.ltcChannel)) || 1);
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let latest = clearedState(enabled, ltcEnabled);
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let lastFrame = '';
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let stopped = false;
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let pollTimer = null;
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let tick = 0;
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/** uuid → { name, index, type, allowsOverrun } from /v1/timers, in list order. */
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let timerConfigs = new Map();
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/** null = probe /v1/timecode/status on the next reachable tick. */
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let ltcSupported = null;
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let ltcLast = { time: '', receiving: false };
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/** Live view of the stage-display websocket's LTC field (stage-ws.js). */
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let stageLtc = { bound: false, time: '', receiving: false, note: '' };
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/** Latest POST /ltc report from a remote reader, null until one lands. */
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let ingest = null; // { state, time, fps, df, source, at }
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let ingestExpiry = null;
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/** Built-in listener's latest word: { state, time, fps, df } | { error }. */
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let listenerLtc = null;
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/** One LTC verdict from every source, in the precedence the header
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comment explains. Text sources don't know fps — receiving/frozen/
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empty maps onto the same status vocabulary the audio decode uses. */
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function composeLtc() {
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if (!ltcEnabled) {
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return { supported: false, source: '', time: '', receiving: false, status: '', fps: 0, df: false, note: 'LTC listener disabled' };
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}
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const audioVerdict = (src, tag, ageMs) => ({
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supported: true,
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source: tag,
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time: src.time,
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receiving: src.state === 'running',
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status: src.state,
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fps: src.fps,
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df: src.df,
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// While running: how old this timecode is, so clients can pin the
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// anchor to their own clock and count frames between updates.
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...(src.state === 'running' && Number.isFinite(ageMs) ? { ageMs: Math.max(0, ageMs) } : {}),
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note: '',
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});
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// The built-in listener while it has actual data …
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if (listenerLtc && !listenerLtc.error && listenerLtc.state !== 'nosignal') {
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return audioVerdict(listenerLtc, 'listener', listenerLtc.ageMs);
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}
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// … else a fresh remote reader (during migrations both may run —
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// real data beats no data) …
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if (ingest && Date.now() - ingest.at < INGEST_STALE_MS) {
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return audioVerdict(ingest, 'reader', Date.now() - ingest.at);
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}
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// … else a healthy-but-silent listener is believed over the indirect
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// sources: no audio means the LTC really stopped.
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if (listenerLtc && !listenerLtc.error) {
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return audioVerdict(listenerLtc, 'listener');
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}
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const textStatus = (src) => (src.receiving ? 'running' : src.time ? 'stopped' : 'nosignal');
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if (ltcSupported === true) {
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return { supported: true, source: 'api', time: ltcLast.time, receiving: ltcLast.receiving, status: textStatus(ltcLast), fps: 0, df: false, note: '' };
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}
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if (stageLtc.bound) {
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return { supported: true, source: 'stage', time: stageLtc.time, receiving: stageLtc.receiving, status: textStatus(stageLtc), fps: 0, df: false, note: '' };
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}
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if (ingest) {
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// A reader reported once but went silent — likelier to be the
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// story than anything the stage feed has to say.
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return { supported: false, source: '', time: '', receiving: false, status: '', fps: 0, df: false, note: 'LTC reader offline' };
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}
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if (!listenerLtc?.error && ltcSupported === null && !stageLtc.note && enabled) {
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return { supported: null, source: '', time: '', receiving: false, status: '', fps: 0, df: false, note: '' };
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}
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return { supported: false, source: '', time: '', receiving: false, status: '', fps: 0, df: false, note: listenerLtc?.error || stageLtc.note || '' };
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}
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/** Timecode-shaped text — same shape rule as the other sources. */
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const TC_SHAPE = /^-?\d{1,2}:\d{2}:\d{2}[:;.]\d{1,3}$/;
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const INGEST_STATES = new Set(['running', 'stopped', 'nosignal']);
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/** Validated apply of one POST /ltc body. Returns '' or a client error. */
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function applyIngest(body) {
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if (!body || typeof body !== 'object') return 'body must be a JSON object';
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const state = INGEST_STATES.has(body.state) ? body.state : '';
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if (!state) return 'state must be one of running|stopped|nosignal';
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const time = typeof body.time === 'string' && TC_SHAPE.test(body.time.trim()) ? body.time.trim() : '';
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if (state === 'running' && !time) return 'a running report needs a timecode-shaped time';
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ingest = {
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state,
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time,
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fps: Number.isFinite(body.fps) && body.fps > 0 && body.fps <= 120 ? Number(body.fps) : 0,
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df: body.df === true,
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source: String(body.source || '').slice(0, 60),
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at: Date.now(),
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};
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// When the reader dies mid-run the card must not stay green forever —
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// re-broadcast once this report goes stale so the fallbacks take over.
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clearTimeout(ingestExpiry);
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ingestExpiry = setTimeout(broadcast, INGEST_STALE_MS + 100);
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ingestExpiry.unref?.();
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broadcast();
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return '';
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}
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function url(target) {
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const built = new URL(`http://${host}:${port}${target}`);
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if (password) built.searchParams.set('password', password);
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return built;
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}
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async function requestJson(target) {
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const response = await fetch(url(target), {
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headers: { Accept: 'application/json' },
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signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
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});
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if (!response.ok) {
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const err = new Error(`ProPresenter ${response.status} ${response.statusText}`);
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err.status = response.status;
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throw err;
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}
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const text = await response.text();
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return text ? JSON.parse(text) : null;
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}
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function timerType(entry) {
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if (entry.countdown) return 'countdown';
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if (entry.count_down_to_time) return 'countdown_to_time';
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if (entry.elapsed) return 'elapsed';
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return 'unknown';
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}
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function applyTimerList(list) {
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if (!Array.isArray(list)) return;
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const next = new Map();
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for (const entry of list) {
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const uuid = entry?.id?.uuid;
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if (!uuid) continue;
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next.set(uuid, {
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name: String(entry.id.name || 'Timer'),
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index: Number(entry.id.index) || 0,
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type: timerType(entry),
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allowsOverrun: Boolean(entry.allows_overrun),
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});
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}
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timerConfigs = next;
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}
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/** Merge configured timers (order, type) with live values into one list. */
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function mergeTimers(currentTimes) {
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const live = new Map();
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if (Array.isArray(currentTimes)) {
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for (const entry of currentTimes) {
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const uuid = entry?.id?.uuid;
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if (!uuid) continue;
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live.set(uuid, {
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name: String(entry.id.name || ''),
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time: typeof entry.time === 'string' ? entry.time : '',
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state: typeof entry.state === 'string' ? entry.state : '',
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});
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}
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}
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const out = [];
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for (const [uuid, cfg] of timerConfigs) {
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const now = live.get(uuid);
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live.delete(uuid);
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out.push({
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uuid,
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name: (now && now.name) || cfg.name,
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type: cfg.type,
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allowsOverrun: cfg.allowsOverrun,
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time: now ? now.time : '',
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state: now ? now.state : '',
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});
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}
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// Timers reported live but missing from the (possibly stale) config
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// list still deserve a card — type unknown until the slow lane catches up.
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for (const [uuid, now] of live) {
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out.push({ uuid, name: now.name || 'Timer', type: 'unknown', allowsOverrun: false, time: now.time, state: now.state });
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}
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return out;
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}
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/**
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* Liberal parse of a hypothetical timecode-status body (no spec documents
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* its shape — see the header comment). Looks for an "HH:MM:SS:FF"-shaped
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* string and a receiving/running boolean under likely key names.
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*/
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function parseLtc(body) {
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const out = { time: '', receiving: false };
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if (!body || typeof body !== 'object') return out;
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const TC = /^-?\d{1,2}:\d{2}:\d{2}[:;.]\d{1,3}$/;
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for (const key of ['time', 'timecode', 'current_time', 'value']) {
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if (typeof body[key] === 'string' && TC.test(body[key])) {
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out.time = body[key];
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break;
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}
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}
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if (!out.time) {
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for (const value of Object.values(body)) {
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if (typeof value === 'string' && TC.test(value)) {
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out.time = value;
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break;
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}
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}
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}
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for (const key of ['receiving', 'running', 'is_running', 'active']) {
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if (typeof body[key] === 'boolean') {
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out.receiving = body[key];
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break;
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}
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}
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return out;
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}
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async function pollLtc() {
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if (!ltcEnabled) return;
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// A 404 verdict is retried once a minute — an endpoint appearing
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// without an unreachable spell (ProPresenter hot-swapped in testing,
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// or some future in-place upgrade) must not stay invisible forever.
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if (ltcSupported === false && tick % 120 !== 0) return;
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try {
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const body = await requestJson('/v1/timecode/status');
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if (ltcSupported === null) log('timecode endpoint answered — LTC card is live');
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ltcSupported = true;
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ltcLast = parseLtc(body);
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} catch (err) {
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// 404 = this ProPresenter has no timecode API (the expected case, as
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// of API v1). Anything else is a real failure — let the tick handle it.
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if (err && err.status === 404) {
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ltcSupported = false;
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ltcLast = { time: '', receiving: false };
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return;
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}
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throw err;
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}
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}
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function broadcast() {
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latest = {
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enabled,
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ltcEnabled,
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reachable: latest.reachable,
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lastError: latest.lastError,
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timers: latest.timers,
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ltc: composeLtc(),
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};
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if (!streams.size) return;
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let frame;
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try {
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frame = JSON.stringify(latest);
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} catch {
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return;
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}
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if (frame === lastFrame) return;
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lastFrame = frame;
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const payload = `event: state\ndata: ${frame}\n\n`;
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for (const res of streams) {
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try {
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res.write(payload);
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} catch {
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streams.delete(res);
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}
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}
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}
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async function pollTick() {
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if (stopped) return;
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try {
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tick += 1;
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// Slow lane first on the very first tick so cards get names/types
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// immediately; afterwards every SLOW_EVERY ticks.
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if (tick % SLOW_EVERY === 1 || !timerConfigs.size) {
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applyTimerList(await requestJson('/v1/timers'));
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}
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// THE HOT PATH — live values every tick.
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const currentTimes = await requestJson('/v1/timers/current');
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// Probe timecode once per connection; poll it only when it exists.
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await pollLtc();
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latest.timers = mergeTimers(currentTimes);
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latest.reachable = true;
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latest.lastError = '';
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} catch (err) {
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latest.reachable = false;
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latest.lastError = err instanceof Error ? err.message : String(err);
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// Re-probe timecode after a reconnect — the unreachable spell may
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// have been a ProPresenter upgrade or a different machine.
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ltcSupported = null;
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ltcLast = { time: '', receiving: false };
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}
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broadcast();
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if (stopped) return;
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pollTimer = setTimeout(pollTick, latest.reachable ? POLL_MS : RETRY_MS);
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}
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let stageClient = null;
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if (enabled) {
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pollTick();
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log(`polling timers on ${host}:${port}`);
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if (ltcEnabled) {
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stageClient = createStageLtcClient({
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host,
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port,
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password: String(config.stagePassword || ''),
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log,
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// The HTTP poller knows every configured timer's uuid — anything
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// else streaming timecode-shaped text can be heuristically bound.
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isTimerUid: (uid) => timerConfigs.has(uid),
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onUpdate(update) {
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stageLtc = update;
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broadcast();
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},
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});
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}
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} else {
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log('no ProPresenter host configured — set one in /admin');
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}
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// The built-in listener is independent of ProPresenter — LTC-only
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// setups (no host configured) still get the LTC card.
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let ltcListener = null;
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if (ltcEnabled) {
|
||
if (ltcDevice) {
|
||
ltcListener = createLtcListener({
|
||
device: ltcDevice,
|
||
channel: ltcChannel,
|
||
moduleDir: __dirname,
|
||
log,
|
||
onUpdate(update) {
|
||
listenerLtc = update;
|
||
broadcast();
|
||
},
|
||
});
|
||
} else {
|
||
listenerLtc = { error: 'LTC listener is on but no audio device is selected — pick one in Admin' };
|
||
broadcast();
|
||
}
|
||
}
|
||
|
||
const heartbeat = setInterval(() => {
|
||
for (const res of streams) {
|
||
try {
|
||
res.write(': ping\n\n');
|
||
} catch {
|
||
streams.delete(res);
|
||
}
|
||
}
|
||
}, HEARTBEAT_MS);
|
||
heartbeat.unref?.();
|
||
|
||
current = { streams, getLatest: () => latest, ingest: applyIngest };
|
||
|
||
return {
|
||
stop() {
|
||
stopped = true;
|
||
clearTimeout(pollTimer);
|
||
clearTimeout(ingestExpiry);
|
||
clearInterval(heartbeat);
|
||
stageClient?.stop();
|
||
ltcListener?.stop();
|
||
for (const res of streams) {
|
||
try { res.end(); } catch { /* already gone */ }
|
||
}
|
||
streams.clear();
|
||
if (current && current.streams === streams) current = null;
|
||
},
|
||
health() {
|
||
const ltcSource = { listener: ', LTC via listener', reader: ', LTC via remote reader', api: ', LTC via API', stage: ', LTC via stage display' };
|
||
if (!enabled) {
|
||
// The LTC listener/reader work regardless of ProPresenter — an
|
||
// LTC-only setup is half-configured but working.
|
||
if (latest.ltc.supported) return { status: 'ok', message: `No ProPresenter host configured — LTC only${ltcSource[latest.ltc.source] || ''}` };
|
||
return { status: 'error', message: 'No ProPresenter host configured' };
|
||
}
|
||
if (latest.reachable) {
|
||
const ltc = latest.ltc;
|
||
const ltcNote = !ltcEnabled
|
||
? ''
|
||
: ltc.supported
|
||
? (ltcSource[ltc.source] || '')
|
||
: (ltc.note ? ` (LTC: ${ltc.note})` : '');
|
||
return { status: 'ok', message: `Polling ${host}:${port}, ${latest.timers.length} timer(s)${ltcNote}` };
|
||
}
|
||
return {
|
||
status: 'error',
|
||
message: latest.lastError
|
||
? `ProPresenter unreachable: ${latest.lastError}`
|
||
: 'Trying to reach ProPresenter…',
|
||
};
|
||
},
|
||
};
|
||
},
|
||
|
||
/**
|
||
* The Add-tile picker's entries: one per discovered timer, plus "All
|
||
* timers" and the LTC card (moduleApi.variant carries the entry id —
|
||
* 'all', 'timer:<uuid>' or 'ltc'). Answered from the poller's latest
|
||
* state, never from a fresh upstream request — the picker must stay
|
||
* instant, and a dead ProPresenter must not stall it.
|
||
*/
|
||
tiles() {
|
||
const state = current ? current.getLatest() : null;
|
||
if (!state || (!state.enabled && !state.ltcEnabled)) return []; // unconfigured → classic single entry
|
||
const TYPE_LABEL = {
|
||
countdown: 'Countdown timer',
|
||
countdown_to_time: 'Countdown to a time of day',
|
||
elapsed: 'Elapsed timer',
|
||
unknown: 'Timer',
|
||
};
|
||
const oneCard = { defaultSize: { w: 3, h: 2 }, minSize: { w: 2, h: 1 } };
|
||
return [
|
||
{
|
||
id: 'all',
|
||
name: 'All timers',
|
||
description: state.ltcEnabled
|
||
? 'Every timer and the LTC timecode, selectable per tile'
|
||
: 'Every timer, selectable per tile',
|
||
},
|
||
...state.timers.map((t) => ({
|
||
id: `timer:${t.uuid}`,
|
||
name: t.name,
|
||
description: TYPE_LABEL[t.type] || 'Timer',
|
||
...oneCard,
|
||
})),
|
||
// The LTC entry exists only while the admin switch is on.
|
||
...(state.ltcEnabled
|
||
? [{ id: 'ltc', name: 'LTC timecode', description: 'Incoming timecode (HH:MM:SS:FF)', ...oneCard }]
|
||
: []),
|
||
];
|
||
},
|
||
|
||
routes({ config }) {
|
||
const sendJson = (res, code, body) => {
|
||
res.writeHead(code, { 'Content-Type': 'application/json; charset=utf-8', 'Cache-Control': 'no-store' });
|
||
res.end(JSON.stringify(body));
|
||
};
|
||
return {
|
||
'GET /state': (req, res) => {
|
||
sendJson(res, 200, { state: current ? current.getLatest() : clearedState(false) });
|
||
},
|
||
|
||
// The admin device picker asks this machine what it can hear. The
|
||
// options shape matches the admin select's optionsRoute contract.
|
||
'GET /ltc/devices': (req, res) => {
|
||
const bin = require('path').join(__dirname, 'ltc-capture');
|
||
const child = spawn(bin, ['--list'], { stdio: ['ignore', 'ignore', 'pipe'], timeout: 4000 });
|
||
let err = '';
|
||
child.stderr.setEncoding('utf8');
|
||
child.stderr.on('data', (t) => { err += t; });
|
||
child.on('error', () => {
|
||
sendJson(res, 200, { options: [], error: 'LTC capture tool missing — see modules/propresenter-timers/ltc-capture.swift' });
|
||
});
|
||
child.on('exit', () => {
|
||
if (res.writableEnded) return;
|
||
const options = [];
|
||
for (const line of err.split('\n')) {
|
||
const m = line.match(/^ltc-capture:\s+(.*?)\s+(\d+) ch\s+(\d+) Hz\s+uid=/);
|
||
if (m) options.push({ value: m[1], label: `${m[1]} — ${m[2]} ch @ ${(Number(m[3]) / 1000)} kHz` });
|
||
}
|
||
sendJson(res, 200, { options });
|
||
});
|
||
},
|
||
|
||
// A remote LTC reader (tools/ltc-reader.js, on the machine that can
|
||
// hear the LTC when this one can't) reports here — the one route on
|
||
// this module that accepts writes, so it optionally carries a shared
|
||
// token (Admin → "LTC reader token").
|
||
'POST /ltc': (req, res) => {
|
||
if (!config.ltcEnabled) {
|
||
return void sendJson(res, 409, { error: 'LTC listener is disabled in Admin — enable it to accept reader reports' });
|
||
}
|
||
const token = String(config.ingestToken || '');
|
||
if (token) {
|
||
const given = String(req.headers.authorization || '').replace(/^Bearer\s+/i, '');
|
||
if (given !== token) return void sendJson(res, 401, { error: 'bad or missing token' });
|
||
}
|
||
let body = '';
|
||
req.on('data', (chunk) => {
|
||
body += chunk;
|
||
if (body.length > 4096) {
|
||
sendJson(res, 413, { error: 'body too large' });
|
||
req.destroy();
|
||
}
|
||
});
|
||
req.on('end', () => {
|
||
if (!current) return void sendJson(res, 503, { error: 'module not mounted' });
|
||
let parsed;
|
||
try {
|
||
parsed = JSON.parse(body);
|
||
} catch {
|
||
return void sendJson(res, 400, { error: 'invalid JSON' });
|
||
}
|
||
const problem = current.ingest(parsed);
|
||
if (problem) return void sendJson(res, 400, { error: problem });
|
||
sendJson(res, 200, { ok: true });
|
||
});
|
||
},
|
||
|
||
'GET /stream': (req, res) => {
|
||
res.writeHead(200, {
|
||
'Content-Type': 'text/event-stream; charset=utf-8',
|
||
'Cache-Control': 'no-cache, no-transform',
|
||
Connection: 'keep-alive',
|
||
'X-Accel-Buffering': 'no',
|
||
});
|
||
res.write('retry: 3000\n\n');
|
||
const state = current ? current.getLatest() : clearedState(false);
|
||
res.write(`event: state\ndata: ${JSON.stringify(state)}\n\n`);
|
||
if (!current) return void res.end();
|
||
const { streams } = current;
|
||
// A viewer that stops reading (locked tablet, sleeping laptop) must
|
||
// not queue frames forever; keepalive probes make the OS notice.
|
||
try { req.socket.setKeepAlive(true, 15000); } catch { /* gone */ }
|
||
streams.add(res);
|
||
req.on('close', () => streams.delete(res));
|
||
},
|
||
};
|
||
},
|
||
};
|