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28 lines
1.0 KiB
Python
28 lines
1.0 KiB
Python
"""
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Verify connectivity to the database from the service layer for health check purposes.
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The production system will regularly check the health of running containers via accessing an API endpoint.
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The API endpoint is backed by this service which executes a simple statement against our backing database.
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In more complex deployments, where multiple backing services may be depended upon, the health check process
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would necessarily also become more complex to reflect the health of all subsystems.
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In this context health does not refer to correctness as much as running, connected, and responsive.
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"""
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from fastapi import Depends
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from sqlalchemy import text
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from ..database import Session, db_session
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class HealthService:
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_session: Session
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def __init__(self, session: Session = Depends(db_session)):
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self._session = session
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def check(self):
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stmt = text("SELECT 'OK', NOW()")
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result = self._session.execute(stmt)
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row = result.all()[0]
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return str(f"{row[0]} @ {row[1]}")
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