storage: copy guild.region into channel.rtc_region

close #130

litecord/storage.py

@@ -432,7 +432,7 @@ class Storage:
 
             return {**row, **drow}
         elif chan_type == ChannelType.GUILD_VOICE:
-            vrow = await self.db.fetchrow(
+            voice_channel_data = await self.db.fetchrow(
                 """
             SELECT bitrate, user_limit
             FROM guild_voice_channels
@@ -441,7 +441,20 @@ class Storage:
                 row["id"],
             )
 
-            return {**row, **dict(vrow)}
+            guild_region = await self.db.fetchval(
+                """
+                SELECT region
+                FROM guilds
+                WHERE guild.id = $1
+                """,
+                guild_id,
+                row["guild_id"],
+            )
+
+            # see https://gitlab.com/litecord/litecord/-/issues/130
+            voice_channel_data["rtc_region"] = guild_region
+
+            return {**row, **dict(voice_channel_data)}
         else:
             # this only exists to trick mypy. this codepath is unreachable
             raise AssertionError("Unreachable code path.")