Update Alembic to use asyncpg to run migrations

1 files changed, 29 insertions, 21 deletions

diff --git a/alembic/env.py b/alembic/env.py
index 7978da1..903d5ef 100644
--- a/alembic/env.py
+++ b/alembic/env.py
@@ -1,15 +1,17 @@
 from logging.config import fileConfig
 
-from sqlalchemy import engine_from_config
+from sqlalchemy.ext.asyncio import async_engine_from_config
 from sqlalchemy import pool
 
+import asyncio
+
 from alembic import context
 
 import sys
 sys.path.append(".")
 
 from metricity.database import build_db_uri
-from metricity.models import db
+from metricity.models import Base
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
@@ -23,7 +25,7 @@ fileConfig(config.config_file_name)
 # for 'autogenerate' support
 # from myapp import mymodel
 # target_metadata = mymodel.Base.metadata
-target_metadata = db
+target_metadata = Base.metadata
 
 # other values from the config, defined by the needs of env.py,
 # can be acquired:
@@ -32,6 +34,28 @@ target_metadata = db
 
 config.set_main_option('sqlalchemy.url', build_db_uri())
 
+def do_run_migrations(connection):
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+async def run_async_migrations():
+    """In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
 
 def run_migrations_offline():
     """Run migrations in 'offline' mode.
@@ -58,25 +82,9 @@ def run_migrations_offline():
 
 
 def run_migrations_online():
-    """Run migrations in 'online' mode.
-
-    In this scenario we need to create an Engine
-    and associate a connection with the context.
-
-    """
-    connectable = engine_from_config(
-        config.get_section(config.config_ini_section),
-        prefix="sqlalchemy.",
-        poolclass=pool.NullPool,
-    )
-
-    with connectable.connect() as connection:
-        context.configure(
-            connection=connection, target_metadata=target_metadata
-        )
+    """Run migrations in 'online' mode."""
 
-        with context.begin_transaction():
-            context.run_migrations()
+    asyncio.run(run_async_migrations())
 
 
 if context.is_offline_mode():