Fixed improper closing of resources on exit

bazarr.py

@@ -52,22 +52,27 @@ dir_name = os.path.dirname(__file__)
 
 def end_child_process(ep):
     try:
-        ep.kill()
+        if os.name != 'nt':
+            try:
+                ep.send_signal(signal.SIGINT)
+            except ProcessLookupError:
+                pass
+        else:
+            import win32api
+            import win32con
+            try:
+                win32api.GenerateConsoleCtrlEvent(win32con.CTRL_C_EVENT, ep.pid)
+            except KeyboardInterrupt:
+                pass
     except:
-        pass
-
-def terminate_child_process(ep):
-    try:
         ep.terminate()
-    except:
-        pass
 
 
 def start_bazarr():
     script = [get_python_path(), "-u", os.path.normcase(os.path.join(dir_name, 'bazarr', 'main.py'))] + sys.argv[1:]
     ep = subprocess.Popen(script, stdout=None, stderr=None, stdin=subprocess.DEVNULL)
     atexit.register(end_child_process, ep=ep)
-    signal.signal(signal.SIGTERM, lambda signal_no, frame: terminate_child_process(ep))
+    signal.signal(signal.SIGTERM, lambda signal_no, frame: end_child_process(ep))
 
 
 def check_status():

bazarr/app/database.py

@@ -5,6 +5,7 @@ import json
 import logging
 import os
 import flask_migrate
+import signal
 
 from dogpile.cache import make_region
 from datetime import datetime
@@ -12,7 +13,7 @@ from datetime import datetime
 from sqlalchemy import create_engine, inspect, DateTime, ForeignKey, Integer, LargeBinary, Text, func, text, BigInteger
 # importing here to be indirectly imported in other modules later
 from sqlalchemy import update, delete, select, func  # noqa W0611
-from sqlalchemy.orm import scoped_session, sessionmaker, mapped_column
+from sqlalchemy.orm import scoped_session, sessionmaker, mapped_column, close_all_sessions
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.pool import NullPool
 
@@ -74,11 +75,18 @@ session_factory = sessionmaker(bind=engine)
 database = scoped_session(session_factory)
 
 
+def close_database():
+    close_all_sessions()
+    engine.dispose()
+
+
 @atexit.register
 def _stop_worker_threads():
     database.remove()
 
 
+signal.signal(signal.SIGTERM, lambda signal_no, frame: close_database())
+
 Base = declarative_base()
 metadata = Base.metadata
 

bazarr/app/server.py

@@ -13,7 +13,7 @@ from api import api_bp
 from .ui import ui_bp
 from .get_args import args
 from .config import settings, base_url
-from .database import database
+from .database import close_database
 from .app import create_app
 
 app = create_app()
@@ -63,49 +63,40 @@ class Server:
                 self.shutdown()
 
     def start(self):
+        logging.info(f'BAZARR is started and waiting for request on http://{self.server.effective_host}:'
+                     f'{self.server.effective_port}')
         try:
-            logging.info(f'BAZARR is started and waiting for request on http://{self.server.effective_host}:'
-                         f'{self.server.effective_port}')
-            try:
-                self.server.run()
-            except Exception:
-                pass
-        except KeyboardInterrupt:
+            self.server.run()
+        except (KeyboardInterrupt, SystemExit):
             self.shutdown()
+        except Exception:
+            pass
 
     def shutdown(self):
         try:
-            self.server.close()
+            stop_file = io.open(os.path.join(args.config_dir, "bazarr.stop"), "w", encoding='UTF-8')
         except Exception as e:
-            logging.error(f'BAZARR Cannot stop Waitress: {repr(e)}')
+            logging.error(f'BAZARR Cannot create stop file: {repr(e)}')
         else:
-            database.close()
-            try:
-                stop_file = io.open(os.path.join(args.config_dir, "bazarr.stop"), "w", encoding='UTF-8')
-            except Exception as e:
-                logging.error(f'BAZARR Cannot create stop file: {repr(e)}')
-            else:
-                logging.info('Bazarr is being shutdown...')
-                stop_file.write(str(''))
-                stop_file.close()
-                os._exit(0)
+            logging.info('Bazarr is being shutdown...')
+            stop_file.write(str(''))
+            stop_file.close()
+            close_database()
+            self.server.close()
+            os._exit(0)
 
     def restart(self):
         try:
-            self.server.close()
+            restart_file = io.open(os.path.join(args.config_dir, "bazarr.restart"), "w", encoding='UTF-8')
         except Exception as e:
-            logging.error(f'BAZARR Cannot stop Waitress: {repr(e)}')
+            logging.error(f'BAZARR Cannot create restart file: {repr(e)}')
         else:
-            database.close()
-            try:
-                restart_file = io.open(os.path.join(args.config_dir, "bazarr.restart"), "w", encoding='UTF-8')
-            except Exception as e:
-                logging.error(f'BAZARR Cannot create restart file: {repr(e)}')
-            else:
-                logging.info('Bazarr is being restarted...')
-                restart_file.write(str(''))
-                restart_file.close()
-                os._exit(0)
+            logging.info('Bazarr is being restarted...')
+            restart_file.write(str(''))
+            restart_file.close()
+            close_database()
+            self.server.close()
+            os._exit(0)
 
 
 webserver = Server()

bazarr/app/signalr_client.py

@@ -340,14 +340,20 @@ def consume_queue(queue):
             data = queue.popleft()
         except IndexError:
             pass
+        except (KeyboardInterrupt, SystemExit):
+            break
         else:
             dispatcher(data)
         sleep(0.1)
 
 
 # start both queue consuming threads
-threading.Thread(target=consume_queue, args=(sonarr_queue,)).start()
-threading.Thread(target=consume_queue, args=(radarr_queue,)).start()
+sonarr_queue_thread = threading.Thread(target=consume_queue, args=(sonarr_queue,))
+sonarr_queue_thread.daemon = True
+sonarr_queue_thread.start()
+radarr_queue_thread = threading.Thread(target=consume_queue, args=(radarr_queue,))
+radarr_queue_thread.daemon = True
+radarr_queue_thread.start()
 
 # instantiate proper SignalR client
 sonarr_signalr_client = SonarrSignalrClientLegacy() if get_sonarr_info.version().startswith(('0.', '2.', '3.')) else \

bazarr/init.py

@@ -77,6 +77,8 @@ def is_virtualenv():
 # deploy requirements.txt
 if not args.no_update:
     try:
+        if os.name == 'nt':
+            import win32api, win32con  # noqa E401
         import lxml, numpy, webrtcvad, setuptools, PIL  # noqa E401
     except ImportError:
         try:

bazarr/main.py

@@ -1,8 +1,6 @@
 # coding=utf-8
 
 import os
-import io
-import logging
 
 from threading import Thread
 
@@ -75,9 +73,15 @@ update_notifier()
 
 if not args.no_signalr:
     if settings.general.use_sonarr:
-        Thread(target=sonarr_signalr_client.start).start()
+        sonarr_signalr_thread = Thread(target=sonarr_signalr_client.start)
+        sonarr_signalr_thread.daemon = True
+        sonarr_signalr_thread.start()
+        sonarr_signalr_thread.join()
     if settings.general.use_radarr:
-        Thread(target=radarr_signalr_client.start).start()
+        radarr_signalr_thread = Thread(target=radarr_signalr_client.start)
+        radarr_signalr_thread.daemon = True
+        radarr_signalr_thread.start()
+        radarr_signalr_thread.join()
 
 
 if __name__ == "__main__":

requirements.txt

@@ -3,3 +3,4 @@ lxml>=4.3.0, <5.0.0
 numpy>=1.12.0
 webrtcvad-wheels>=2.0.10
 Pillow>=9.0.0 --only-binary=Pillow
+pywin32; platform_system == "Windows"