docekr

app/database.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+import fcntl
+from contextlib import contextmanager
+from pathlib import Path
+
+from flask import Flask
+
+from .database_init import initialize_database
+from .database_migrations import migrate_database
+
+
+@contextmanager
+def _startup_lock(app: Flask):
+    lock_path = Path(app.instance_path) / ".database-startup.lock"
+    lock_path.parent.mkdir(parents=True, exist_ok=True)
+
+    with lock_path.open("w") as lock_file:
+        fcntl.flock(lock_file.fileno(), fcntl.LOCK_EX)
+        try:
+            yield
+        finally:
+            fcntl.flock(lock_file.fileno(), fcntl.LOCK_UN)
+
+
+def prepare_database(app: Flask) -> list[str]:
+    with app.app_context(), _startup_lock(app):
+        initialize_database()
+        return migrate_database()
+
+
+__all__ = ["initialize_database", "migrate_database", "prepare_database"]