Add initial Restreamer implementation for YouTube-to-Jellyfin live restreaming

tests/test_broadcaster.py

@@ -0,0 +1,35 @@
+import asyncio
+
+from restreamer.broadcaster import ChannelBroadcaster
+
+
+async def test_publish_fans_out_to_all_subscribers() -> None:
+    broadcaster = ChannelBroadcaster("test")
+    first = broadcaster.subscribe()
+    second = broadcaster.subscribe()
+
+    broadcaster.publish(b"chunk")
+
+    assert await first.get() == b"chunk"
+    assert await second.get() == b"chunk"
+
+
+async def test_unsubscribe_stops_receiving() -> None:
+    broadcaster = ChannelBroadcaster("test")
+    queue = broadcaster.subscribe()
+    broadcaster.unsubscribe(queue)
+
+    broadcaster.publish(b"chunk")
+
+    assert queue.empty()
+
+
+async def test_full_queue_drops_slow_subscriber() -> None:
+    broadcaster = ChannelBroadcaster("test")
+    queue = broadcaster.subscribe()
+
+    for _ in range(queue.maxsize + 1):
+        broadcaster.publish(b"x")
+        await asyncio.sleep(0)
+
+    assert broadcaster.subscriber_count == 0