[AZ-180] Refactor detection event handling and improve SSE support

- Updated the detection image endpoint to require a channel ID for event streaming.
- Introduced a new endpoint for streaming detection events, allowing clients to receive real-time updates.
- Enhanced the internal buffering mechanism for detection events to manage multiple channels.
- Refactored the inference module to support the new event handling structure.

Made-with: Cursor

e2e/tests/test_video.py

@@ -1,6 +1,7 @@
 import json
 import threading
 import time
+import uuid
 from pathlib import Path
 
 import pytest
@@ -24,29 +25,22 @@ def video_events(warm_engine, http_client, auth_headers):
     if not Path(_VIDEO).is_file():
         pytest.skip(f"missing fixture {_VIDEO}")
 
-    r = http_client.post(
-        "/detect/video",
-        data=_chunked_reader(_VIDEO),
-        headers={
-            **auth_headers,
-            "X-Filename": "video_test01.mp4",
-            "Content-Type": "application/octet-stream",
-        },
-        timeout=15,
-    )
-    assert r.status_code == 200
-    media_id = r.json()["mediaId"]
-
+    channel_id = str(uuid.uuid4())
     collected: list[tuple[float, dict]] = []
     thread_exc: list[BaseException] = []
     done = threading.Event()
+    connected = threading.Event()
 
     def _listen():
         try:
             with http_client.get(
-                f"/detect/{media_id}", stream=True, timeout=35, headers=auth_headers
+                f"/detect/events/{channel_id}",
+                stream=True,
+                timeout=60,
+                headers=auth_headers,
             ) as resp:
                 resp.raise_for_status()
+                connected.set()
                 sse = sseclient.SSEClient(resp)
                 for event in sse.events():
                     if not event.data or not str(event.data).strip():
@@ -61,10 +55,26 @@ def video_events(warm_engine, http_client, auth_headers):
         except BaseException as e:
             thread_exc.append(e)
         finally:
+            connected.set()
             done.set()
 
     th = threading.Thread(target=_listen, daemon=True)
     th.start()
+    connected.wait(timeout=5)
+
+    r = http_client.post(
+        "/detect/video",
+        data=_chunked_reader(_VIDEO),
+        headers={
+            **auth_headers,
+            "X-Channel-Id": channel_id,
+            "X-Filename": "video_test01.mp4",
+            "Content-Type": "application/octet-stream",
+        },
+        timeout=15,
+    )
+    assert r.status_code == 202
+
     assert done.wait(timeout=30)
     th.join(timeout=5)
     assert not thread_exc, thread_exc