kopia lustrzana https://github.com/bugout-dev/moonstream
41 wiersze
1.2 KiB
Python
41 wiersze
1.2 KiB
Python
"""
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Moonstream database connection.
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"""
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from contextlib import contextmanager
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import os
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from sqlalchemy import create_engine
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from sqlalchemy.orm import sessionmaker, Session
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MOONSTREAM_DB_URI = os.environ.get("MOONSTREAM_DB_URI")
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if MOONSTREAM_DB_URI is None:
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raise ValueError("MOONSTREAM_DB_URI environment variable must be set")
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MOONSTREAM_POOL_SIZE_RAW = os.environ.get("MOONSTREAM_POOL_SIZE", 0)
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try:
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if MOONSTREAM_POOL_SIZE_RAW is not None:
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MOONSTREAM_POOL_SIZE = int(MOONSTREAM_POOL_SIZE_RAW)
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except:
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raise Exception(
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f"Could not parse MOONSTREAM_POOL_SIZE as int: {MOONSTREAM_POOL_SIZE_RAW}"
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)
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# https://docs.sqlalchemy.org/en/14/core/pooling.html#sqlalchemy.pool.QueuePool
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engine = create_engine(MOONSTREAM_DB_URI, pool_size=MOONSTREAM_POOL_SIZE)
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SessionLocal = sessionmaker(bind=engine)
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def yield_db_session() -> Session:
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"""
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Yields a database connection (created using environment variables).
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As per FastAPI docs:
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https://fastapi.tiangolo.com/tutorial/sql-databases/#create-a-dependency
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"""
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session = SessionLocal()
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try:
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yield session
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finally:
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session.close()
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yield_db_session_ctx = contextmanager(yield_db_session)
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