Check current migration on startup

alembic/README

@@ -0,0 +1 @@
+Generic single-database configuration.

alembic/env.py

@@ -0,0 +1,71 @@
+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+
+from database.engine import engine
+from database.models import Base
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection):
+    context.configure(connection=connection, target_metadata=target_metadata, render_as_batch=True)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())

alembic/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

database/migrations.py

@@ -0,0 +1,26 @@
+import logging
+
+from alembic import config, script
+from alembic.runtime import migration
+
+from database.engine import engine
+
+
+async def ensure_latest_migration():
+    """Make sure we are currently on the latest revision, otherwise raise an exception"""
+    alembic_config = config.Config("alembic.ini")
+    alembic_script = script.ScriptDirectory.from_config(alembic_config)
+
+    async with engine.begin() as connection:
+        current_revision = await connection.run_sync(
+            lambda sync_connection: migration.MigrationContext.configure(sync_connection).get_current_revision()
+        )
+
+        alembic_head = alembic_script.get_current_head()
+
+        if current_revision != alembic_head:
+            error_message = (
+                f"Pending migrations (current revision is {current_revision}, while head is at {alembic_head})"
+            )
+            logging.error(error_message)
+            raise RuntimeError(error_message)

didier/didier.py

@@ -1,5 +1,4 @@
 import discord
-from discord import Message
 from discord.ext import commands
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -15,9 +14,14 @@ class Didier(commands.Bot):
         activity = discord.Activity(type=discord.ActivityType.playing, name=settings.DISCORD_STATUS_MESSAGE)
         status = discord.Status.online
 
-        intents = discord.Intents.default()
-        intents.members = True
-        intents.message_content = True
+        intents = discord.Intents(
+            guilds=True,
+            members=True,
+            message_content=True,
+            emojis=True,
+            messages=True,
+            reactions=True,
+        )
 
         super().__init__(
             command_prefix=get_prefix, case_insensitive=True, intents=intents, activity=activity, status=status
@@ -27,10 +31,3 @@ class Didier(commands.Bot):
     def db_session(self) -> AsyncSession:
         """Obtain a database session"""
         return DBSession()
-
-    async def on_ready(self):
-        """Event triggered when the bot is ready"""
-        print(settings.DISCORD_READY_MESSAGE)
-
-    async def on_message(self, message: Message, /) -> None:
-        print(message.content)

docker-compose.yml

@@ -0,0 +1,16 @@
+version: '3.9'
+services:
+  db:
+    image: postgres:14
+    container_name: didier
+    restart: always
+    environment:
+      - POSTGRES_DB=${DB_NAME:-didier_dev}
+      - POSTGRES_USER=${DB_USERNAME:-postgres}
+      - POSTGRES_PASSWORD=${DB_PASSWORD:-postgres}
+    ports:
+      - "${DB_PORT:-5432}:${DB_PORT:-5432}"
+    volumes:
+      - db:/var/lib/postgresql/data
+volumes:
+  db:

main.py

@@ -4,6 +4,7 @@ from logging.handlers import RotatingFileHandler
 import asyncio
 
 import settings
+from database.migrations import ensure_latest_migration
 from didier import Didier
 
 
@@ -28,7 +29,12 @@ def setup_logging():
     logging.getLogger("discord").setLevel(logging.ERROR)
 
 
-if __name__ == "__main__":
+async def main():
+    """Do some setup & checks, and then run the bot"""
     setup_logging()
+    await ensure_latest_migration()
+    await run_bot()
 
-    asyncio.run(run_bot())
+
+if __name__ == "__main__":
+    asyncio.run(main())