75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
"""Gunicorn runtime config.
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`preload_app` imports Flask before worker fork. Any SQLAlchemy engines created
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during import must drop inherited connection pools in each child worker.
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"""
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import os
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import sys
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from sqlalchemy.engine import Engine
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bind = "0.0.0.0:80"
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workers = int(os.getenv("WEB_CONCURRENCY", "4"))
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timeout = int(os.getenv("GUNICORN_TIMEOUT", "300"))
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accesslog = "-"
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errorlog = "-"
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preload_app = True
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def _dispose_engine(engine, label, server):
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try:
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try:
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engine.dispose(close=False)
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except TypeError:
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engine.dispose()
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server.log.info("Disposed inherited SQLAlchemy engine after fork: %s", label)
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return True
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except Exception:
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server.log.exception("Failed disposing inherited SQLAlchemy engine: %s", label)
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return False
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def post_fork(server, worker):
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"""Reset DB pools inherited from the preloaded master process.
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SQLAlchemy engines are safe to keep as objects after fork, but their pools
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must be replaced so workers do not share PostgreSQL TCP sockets.
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"""
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disposed_ids = set()
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disposed_count = 0
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prefixes = ("app", "database.", "routes.", "services.")
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for module_name, module in list(sys.modules.items()):
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if module is None or not module_name.startswith(prefixes):
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continue
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for attr_name, value in vars(module).items():
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candidates = []
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if isinstance(value, Engine):
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candidates.append((value, f"{module_name}.{attr_name}"))
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else:
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try:
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engine = getattr(value, "engine", None)
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except Exception:
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# Flask/Werkzeug LocalProxy objects may require a request
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# context when inspected. They cannot own global DB pools.
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continue
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if isinstance(engine, Engine):
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candidates.append((engine, f"{module_name}.{attr_name}.engine"))
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for engine, label in candidates:
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engine_id = id(engine)
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if engine_id in disposed_ids:
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continue
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disposed_ids.add(engine_id)
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if _dispose_engine(engine, label, server):
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disposed_count += 1
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server.log.info(
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"Worker %s reset %s SQLAlchemy engine pool(s) after preload fork",
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worker.pid,
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disposed_count,
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)
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