Initial commit: watch-together phases 0-4 + presence hardening, internet-tested

tool/e2e_check.dart

@@ -0,0 +1,134 @@
+import 'dart:io';
+
+import 'package:sync_relay_core/core.dart';
+
+int _failures = 0;
+
+void check(String name, bool ok, [String detail = '']) {
+  // ignore: avoid_print
+  print('${ok ? 'PASS' : 'FAIL'} $name${detail.isEmpty ? '' : ' ($detail)'}');
+  if (!ok) _failures++;
+}
+
+class FakeViewer {
+  final RoomEngine engine;
+  final String token;
+  double ownPosition;
+  double buffered;
+  final double lagSecs;
+  int seenEventId = 0;
+
+  FakeViewer(this.engine, this.token,
+      {this.ownPosition = 0, this.buffered = 6.0, this.lagSecs = 0});
+
+  void tick() {
+    seenEventId = engine.eventId;
+    final edge = engine.positionAt();
+    if ((ownPosition - edge).abs() > 0.5) {
+      ownPosition = edge - lagSecs;
+      if (ownPosition < 0) ownPosition = 0;
+    } else {
+      ownPosition = edge - lagSecs;
+      if (ownPosition < 0) ownPosition = 0;
+    }
+    engine.applyReport(token, ownPosition, buffered, seenEventId);
+  }
+}
+
+Future<void> main(List<String> args) async {
+  var simTime = DateTime.utc(2026, 1, 1);
+  final engine = RoomEngine(clock: () => simTime);
+  engine.media = const HelloMedia(name: 'Movie.mkv', size: 4000000000, duration: 7200.0);
+
+  void step([int seconds = 1]) => simTime = simTime.add(Duration(seconds: seconds));
+
+  engine.applyJoin('a', 'alice', '');
+  engine.applyJoin('b', 'bob', '');
+  engine.applyJoin('c', 'cara', '');
+  for (final t in ['a', 'b', 'c']) {
+    engine.applyReady(t, true);
+    engine.applyReport(t, 0, 6.0, engine.eventId);
+  }
+  check('room playing after all ready+buffered', engine.transport == Transport.playing);
+
+  final alice = FakeViewer(engine, 'a');
+  final bob = FakeViewer(engine, 'b');
+  final cara = FakeViewer(engine, 'c', lagSecs: 8.0);
+  var viewers = [alice, bob, cara];
+
+  for (var s = 0; s < 3600; s++) {
+    step();
+    for (final v in viewers) {
+      v.tick();
+    }
+  }
+  final edge1h = engine.positionAt();
+  check('1h in, edge advanced ~3600s', (edge1h - 3600).abs() < 2.0, 'edge=$edge1h');
+  check('lagging cara never dragged clock', (engine.positionAt() - 3600).abs() < 2.0,
+      'edge=${engine.positionAt()}');
+
+  final eidBeforeSeek = engine.eventId;
+  engine.applySeek('a', edge1h + 600);
+  check('seek jumps edge once', (engine.positionAt() - (edge1h + 600)).abs() < 0.01);
+  check('seek bumps eventId', engine.eventId == eidBeforeSeek + 1);
+  engine.applyReport('c', edge1h - 8.0, 6.0, eidBeforeSeek);
+  check('stale-event report causes no ping-pong',
+      (engine.positionAt() - (edge1h + 600)).abs() < 0.5, 'edge=${engine.positionAt()}');
+
+  for (var s = 0; s < 1800; s++) {
+    step();
+    for (final v in viewers) {
+      v.tick();
+    }
+  }
+
+  engine.applyJoin('d', 'dan', '');
+  check('mid-play join does not halt room', engine.transport == Transport.playing);
+  final dan = FakeViewer(engine, 'd');
+  dan.ownPosition = engine.positionAt();
+  dan.tick();
+  engine.applyReady('d', true);
+  engine.applyReport('d', dan.ownPosition, 6.0, engine.eventId);
+  viewers.add(dan);
+  check('late joiner lands in set + in sync',
+      engine.members['d']!.inSet && (dan.ownPosition - engine.positionAt()).abs() < 1.0);
+
+  for (var s = 0; s < 600; s++) {
+    step();
+    for (final v in viewers) {
+      v.tick();
+    }
+  }
+  engine.applyReady('b', false);
+  final frozen = engine.positionAt();
+  check('unready pauses room', engine.transport == Transport.held);
+  for (var s = 0; s < 30; s++) {
+    step();
+    engine.applyReport('a', frozen, 6.0, engine.eventId);
+    engine.applyReport('c', frozen - 8.0, 6.0, engine.eventId);
+    engine.applyReport('d', frozen, 6.0, engine.eventId);
+  }
+  check('held edge frozen for 30s', (engine.positionAt() - frozen).abs() < 0.01);
+  engine.applyReady('b', true);
+  for (final v in viewers) {
+    engine.applyReport(v.token, frozen, 6.0, engine.eventId);
+  }
+  check('unpause resumes', engine.transport == Transport.playing);
+  check('resume aligned within RTT tolerance', (engine.positionAt() - frozen).abs() < 1.0,
+      'edge=${engine.positionAt()} frozen=$frozen');
+
+  for (var i = 0; i < 20; i++) {
+    engine.applyReady('c', false);
+    engine.applyReady('c', true);
+    engine.applyReport('c', engine.positionAt(), 6.0, engine.eventId);
+  }
+  check('post-flap room converges to playing', engine.transport == Transport.playing);
+
+  engine.applySwap('a', const HelloMedia(name: 'Ep02.mkv', size: 100, duration: 1200.0));
+  check('swap holds + resets edge', engine.transport == Transport.held && engine.positionAt() == 0);
+  check('swap clears sets', engine.members.values.every((m) => !m.inSet && !m.ready));
+
+  // ignore: avoid_print
+  print(_failures == 0 ? 'E2E ALL PASS' : 'E2E $_failures FAILURES');
+  exitCode = _failures == 0 ? 0 : 1;
+}