Move db to own package

mautrix_telegram/db/room_state.py

@@ -0,0 +1,58 @@
+# -*- coding: future_fstrings -*-
+# mautrix-telegram - A Matrix-Telegram puppeting bridge
+# Copyright (C) 2018 Tulir Asokan
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from sqlalchemy import Column, String, Text
+from typing import Dict, Optional
+import json
+
+from ..types import MatrixRoomID
+from .base import Base
+
+
+class RoomState(Base):
+    __tablename__ = "mx_room_state"
+
+    room_id = Column(String, primary_key=True)  # type: MatrixRoomID
+    power_levels = Column("power_levels", Text, nullable=True)  # type: Optional[Dict]
+
+    @property
+    def _power_levels_text(self) -> Optional[str]:
+        return json.dumps(self.power_levels) if self.power_levels else None
+
+    @property
+    def has_power_levels(self) -> bool:
+        return bool(self.power_levels)
+
+    @classmethod
+    def get(cls, room_id: MatrixRoomID) -> Optional['RoomState']:
+        rows = cls.db.execute(cls.t.select().where(cls.c.room_id == room_id))
+        try:
+            room_id, power_levels_text = next(rows)
+            return cls(room_id=room_id, power_levels=(json.loads(power_levels_text)
+                                                      if power_levels_text else None))
+        except StopIteration:
+            return None
+
+    def update(self) -> None:
+        return super().update(power_levels=self._power_levels_text)
+
+    @property
+    def _edit_identity(self):
+        return self.c.room_id == self.room_id
+
+    def insert(self) -> None:
+        self.db.execute(self.t.insert().values(room_id=self.room_id,
+                                               power_levels=self._power_levels_text))