fork and join sessions (#1239)

* introduce fork and join session, fix inference manager race condition

* destroy stream on DELETE

tests/test_api_session.py

@@ -1,3 +1,4 @@
+import ctypes
 import os
 import tempfile
 from datetime import timedelta
@@ -7,11 +8,12 @@ from unittest.mock import patch
 import pytest
 from starlette.testclient import TestClient
 
-from facefusion import metadata, process_manager, session_manager, state_manager
+from facefusion import metadata, process_manager, rtc, rtc_store, session_manager, state_manager
 from facefusion.apis import asset_store
 from facefusion.apis.core import create_api
 from facefusion.download import conditional_download
-from facefusion.types import Session
+from facefusion.libraries import datachannel as datachannel_module
+from facefusion.types import RtcPeer, Session
 from .assert_helper import get_test_example_file, get_test_examples_directory
 
 
@@ -19,6 +21,8 @@ from .assert_helper import get_test_example_file, get_test_examples_directory
 def before_all() -> None:
 	state_manager.init()
 
+	datachannel_module.pre_check()
+
 	process_manager.start()
 	conditional_download(get_test_examples_directory(),
 	[
@@ -238,6 +242,21 @@ def test_destroy_session(test_client : TestClient) -> None:
 	assert session_manager.find_session_id(access_token) == session_id
 	assert delete_session_response.status_code == 404
 
+	peer_connection = rtc.create_peer_connection()
+	rtc_peer : RtcPeer =\
+	{
+		'peer_connection': peer_connection,
+		'video':
+		{
+			'sender_track': rtc.add_video_track(peer_connection, 'sendonly', 'vp8', 96),
+			'receiver_track': 0,
+			'codec': 'vp8'
+		},
+		'sender_bitrate': ctypes.c_uint(0),
+		'receiver_bitrate': ctypes.c_uint(0)
+	}
+	rtc_store.set_peer(session_id, rtc_peer)
+
 	delete_session_response = test_client.delete('/session', headers =
 	{
 		'Authorization': 'Bearer ' + access_token
@@ -245,6 +264,7 @@ def test_destroy_session(test_client : TestClient) -> None:
 
 	assert session_manager.find_session_id(access_token) is None
 	assert asset_store.get_assets(session_id) is None
+	assert rtc_store.has_peer(session_id) is False
 	assert delete_session_response.status_code == 200
 
 	for asset_path in asset_paths: