Fusion
285d3dace8
SQLAlchemy 2.0 async engine.connect() doesn't support context manager. Use explicit connect/close instead.
124 lines
4.3 KiB
Python
124 lines
4.3 KiB
Python
import asyncio
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import logging
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from alembic import command
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from alembic.config import Config
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from alembic.runtime.migration import MigrationContext
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
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from sqlalchemy.pool import NullPool
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from src.config import Settings, build_database_url
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logger = logging.getLogger(__name__)
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settings = Settings()
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database_url = settings.database_url
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# SQLite requires aiosqlite and different connect args
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connect_args = {}
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if database_url.startswith("sqlite"):
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connect_args = {"check_same_thread": False}
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engine = create_async_engine(
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database_url,
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future=True,
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poolclass=NullPool,
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connect_args=connect_args,
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)
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SessionLocal = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
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async def init_database(
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max_retries: int = 5,
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retry_delay: float = 2.0,
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alembic_ini_path: str = "alembic.ini",
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) -> bool:
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"""Initialize the database by running pending migrations.
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Retries the connection with exponential backoff to handle
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database startup latency in containerized environments.
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Returns True if migrations succeeded, False otherwise.
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"""
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for attempt in range(1, max_retries + 1):
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try:
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# Test basic connectivity
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from sqlalchemy import text
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conn = await engine.connect()
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try:
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await conn.execute(text("SELECT 1"))
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finally:
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await conn.close()
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logger.info("Database connection established.")
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# Check if migrations are already complete
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def _check_migrations():
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alembic_cfg = Config(alembic_ini_path)
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script = command.ScriptDirectory.from_config(alembic_cfg)
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with engine.connect() as conn:
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context = MigrationContext.configure(conn)
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current_rev = context.get_current_revision()
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head_rev = script.get_current_head()
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return current_rev == head_rev, current_rev, head_rev
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is_current, current_rev, head_rev = await asyncio.get_event_loop().run_in_executor(
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None, _check_migrations
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)
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if is_current:
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logger.info("Database is already at the latest migration (%s).", head_rev)
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return True
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logger.info("Current revision: %s, Head revision: %s. Running migrations...", current_rev, head_rev)
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# Run alembic migrations (sync call in executor)
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def _run_migrations():
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alembic_cfg = Config(alembic_ini_path)
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command.upgrade(alembic_cfg, "head")
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await asyncio.get_event_loop().run_in_executor(None, _run_migrations)
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logger.info("Database migrations completed successfully.")
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return True
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except Exception as exc:
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error_msg = str(exc).lower()
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if "connection" in error_msg or "could not connect" in error_msg:
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logger.warning(
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"Database connection failed (attempt %d/%d): %s",
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attempt,
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max_retries,
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exc,
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)
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elif "authentication" in error_msg or "password" in error_msg:
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logger.error(
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"Database authentication failed: %s. "
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"Check POSTGRES_USER and POSTGRES_PASSWORD environment variables.",
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exc,
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)
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return False
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else:
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logger.error(
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"Database initialization error (attempt %d/%d): %s",
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attempt,
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max_retries,
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exc,
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)
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if attempt < max_retries:
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wait = retry_delay * (2 ** (attempt - 1))
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logger.info("Retrying in %.1f seconds...", wait)
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await asyncio.sleep(wait)
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else:
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logger.error(
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"Failed to initialize database after %d attempts. "
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"Ensure the database is running and accessible.",
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max_retries,
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)
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return False
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return False
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__all__ = ["SessionLocal", "build_database_url", "engine", "settings", "init_database"]
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