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backend_pre_start.py
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backend_pre_start.py
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import logging
from sqlalchemy import Engine
from sqlmodel import Session, select
from tenacity import after_log, before_log, retry, stop_after_attempt, wait_fixed
from src.app.helpers.db import engine
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
max_tries = 60 * 5 # 5 minutes
wait_seconds = 1
@retry(
stop=stop_after_attempt(max_tries),
wait=wait_fixed(wait_seconds),
before=before_log(logger, logging.INFO),
after=after_log(logger, logging.WARN),
)
def init(db_engine: Engine) -> None:
try:
with Session(db_engine) as session:
# Try to create session to check if DB is awake
session.exec(select(1))
except Exception as e:
logger.error(e)
raise e
def main() -> None:
logger.info("Initializing service")
init(engine)
logger.info("Service finished initializing")
if __name__ == "__main__":
main()