Add a file monitor in the scanner

scanner/scanner/__init__.py

@@ -1,4 +1,5 @@
 from .scanner import Scanner
+from .monitor import monitor
 
 
 async def main():
@@ -11,10 +12,7 @@ async def main():
 	from aiohttp import ClientSession
 	from providers.utils import format_date
 
-	path = os.environ.get("LIBRARY_ROOT")
-	if not path:
-		print("Missing environment variable 'LIBRARY_ROOT'.")
-		exit(2)
+	path = os.environ.get("SCANNER_LIBRARY_ROOT", "/video")
 	languages = os.environ.get("LIBRARY_LANGUAGES")
 	if not languages:
 		print("Missing environment variable 'LIBRARY_LANGUAGES'.")
@@ -38,6 +36,7 @@ async def main():
 			*args, key_transformer=jsons.KEY_TRANSFORMER_CAMELCASE, **kwargs
 		),
 	) as client:
-		await Scanner(client, languages=languages.split(","), api_key=api_key).scan(
-			path
-		)
+		scanner = Scanner(client, languages=languages.split(","), api_key=api_key)
+		await scanner.scan(path)
+		logging.info("Scan finished. Starting to monitor...")
+		await monitor(path, scanner)

scanner/scanner/monitor.py

@@ -0,0 +1,63 @@
+import asyncio
+from functools import wraps
+from watchdog.observers import Observer
+from watchdog.events import FileSystemEventHandler, DirCreatedEvent, FileCreatedEvent, DirMovedEvent, FileMovedEvent, DirDeletedEvent, FileDeletedEvent
+
+from scanner.utils import log_errors
+
+from .scanner import Scanner
+
+task_list = []
+event = asyncio.Event()
+
+async def monitor(path: str, scanner: Scanner):
+	global task_list
+
+	observer = Observer()
+	handler = EventHandler(scanner)
+	observer.schedule(handler, path, recursive=True)
+	observer.start()
+
+	while True:
+		if any(task_list):
+			tl = task_list
+			task_list = []
+			await asyncio.gather(*tl)
+		await event.wait()
+		event.clear()
+	# Should call .join() if the while stops one day.
+	# observer.join()
+
+def async_event(f):
+	# Log errors of f and catch them to prevent the gather to throw.
+	f = log_errors(f)
+
+	@wraps(f)
+	def internal(*args, **kwargs):
+		task_list.append(f(*args, **kwargs))
+		event.set()
+
+	return internal
+
+class EventHandler(FileSystemEventHandler):
+	def __init__(self, scanner: Scanner):
+		self._scanner = scanner
+
+	@async_event
+	async def on_created(self, event: DirCreatedEvent | FileCreatedEvent):
+		if event.is_directory:
+			return
+		await self._scanner.identify(event.src_path)
+
+	# TODO: Implement the following two methods
+	def on_moved(self, event: DirMovedEvent | FileMovedEvent):
+		if event.is_directory:
+			# TODO: Check if this event is also called for files in the directory or not.
+			return
+		print(event.src_path, event.dest_path)
+
+	def on_deleted(self, event: DirDeletedEvent | FileDeletedEvent):
+		if event.is_directory:
+			# TODO: Check if this event is also called for files in the directory or not.
+			return
+		print(event.src_path)