Add core database class and schema.

Author: EvieePy

core/database/__init__.py

@@ -0,0 +1,22 @@
+"""The MIT License (MIT)
+
+Copyright (c) 2021 PythonistaGuild
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+"""
+from .database import Database

core/database/database.py

@@ -0,0 +1,48 @@
+"""The MIT License (MIT)
+
+Copyright (c) 2020 PythonistaGuild
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+"""
+import asyncpg
+
+from core.core import CONFIG
+
+
+class Database:
+
+    _pool: asyncpg.pool.Pool
+
+    @classmethod
+    async def __ainit__(cls) -> None:
+        settings = CONFIG['DATABASE']
+        dsn = f'postgres://{settings["user"]}:{settings["password"]}@{settings["host"]}:{settings["port"]}/' \
+              '{database}'
+
+        try:
+            cls._pool = await asyncpg.create_pool(dsn.format(database=settings['database']))
+        except asyncpg.InvalidCatalogNameError:
+            temp = await asyncpg.connect(dsn.format(database='template1'))
+            await temp.execute(f"""CREATE DATABASE {settings['database']} OWNER {settings['user']}""")
+
+            await temp.close()
+            cls._pool = await asyncpg.create_pool(dsn.format(database=settings['database']))
+
+        with open('core/database/schema.sql') as schema:
+            async with cls._pool.acquire() as connection:
+                await connection.execute(schema.read())