rewrite: New data ORM.

bot/data/database.py

@@ -0,0 +1,38 @@
+import logging
+from collections import namedtuple
+
+# from .cursor import AsyncLoggingCursor
+from .registry import Registry
+from .connector import Connector
+
+
+logger = logging.getLogger(__name__)
+
+Version = namedtuple('Version', ('version', 'time', 'author'))
+
+
+class Database(Connector):
+    # cursor_factory = AsyncLoggingCursor
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.registries: dict[str, Registry] = {}
+
+    def load_registry(self, registry: Registry):
+        registry.bind(self)
+        self.registries[registry.name] = registry
+
+    async def version(self) -> Version:
+        """
+        Return the current schema version as a Version namedtuple.
+        """
+        async with self.conn.cursor() as cursor:
+            # Get last entry in version table, compare against desired version
+            await cursor.execute("SELECT * FROM VersionHistory ORDER BY time DESC LIMIT 1")
+            row = await cursor.fetchone()
+            if row:
+                return Version(row['version'], row['time'], row['author'])
+            else:
+                # No versions in the database
+                return Version(-1, None, None)