117 lines
3.4 KiB
Python
117 lines
3.4 KiB
Python
"""
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Alembic environment configuration for SQLAlchemy with pgvector.
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Uses synchronous psycopg2 driver for migrations to avoid pgbouncer issues.
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"""
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import os
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import sys
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from pathlib import Path
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from logging.config import fileConfig
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from sqlalchemy import pool, engine_from_config
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from sqlalchemy.engine import Connection
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from alembic import context
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from dotenv import load_dotenv
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# Import your models here
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from memora.models import Base
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# Load environment variables based on DATABASE_URL env var or default to local
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def load_env():
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"""Load environment variables from .env.local or .env.dev"""
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# Check if DATABASE_URL is already set (e.g., by CI/CD)
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if os.getenv("DATABASE_URL"):
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return
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# Default to local environment
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env_file = ".env.local"
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if Path(env_file).exists():
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load_dotenv(env_file)
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else:
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# Fallback to dev
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env_file = ".env.dev"
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if Path(env_file).exists():
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load_dotenv(env_file)
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load_env()
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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# Get database URL from environment
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database_url = os.getenv("DATABASE_URL")
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if not database_url:
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raise ValueError("DATABASE_URL environment variable is not set")
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# For migrations, use psycopg2 (sync driver) to avoid pgbouncer prepared statement issues
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# The application uses asyncpg, but migrations work better with psycopg2
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if database_url.startswith("postgresql+asyncpg://"):
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database_url = database_url.replace("postgresql+asyncpg://", "postgresql://", 1)
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elif database_url.startswith("postgres+asyncpg://"):
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database_url = database_url.replace("postgres+asyncpg://", "postgresql://", 1)
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# Override the sqlalchemy.url in alembic.ini
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config.set_main_option("sqlalchemy.url", database_url)
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# add your model's MetaData object here
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# for 'autogenerate' support
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target_metadata = Base.metadata
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# other values from the config, defined by the needs of env.py,
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# can be acquired:
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# my_important_option = config.get_main_option("my_important_option")
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# ... etc.
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def run_migrations_offline() -> None:
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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"""Run migrations in 'online' mode with synchronous engine."""
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=target_metadata
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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