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33 lines
1.5 KiB
Python
33 lines
1.5 KiB
Python
import psycogreen.gevent as pscycogreen_gevent # type: ignore
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from gevent import events as gevent_events
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from grpc.experimental import gevent as grpc_gevent # type: ignore
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# NOTE(QuantumGhost): here we cannot use post_fork to patch gRPC, as
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# grpc_gevent.init_gevent must be called after patching stdlib.
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# Gunicorn calls `post_init` before applying monkey patch.
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# Use `post_init` to setup gRPC gevent support would cause deadlock and
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# some other weird issues.
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#
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# ref:
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# - https://github.com/grpc/grpc/blob/62533ea13879d6ee95c6fda11ec0826ca822c9dd/src/python/grpcio/grpc/experimental/gevent.py
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# - https://github.com/gevent/gevent/issues/2060#issuecomment-3016768668
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# - https://github.com/benoitc/gunicorn/blob/master/gunicorn/arbiter.py#L607-L613
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def post_patch(event):
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# this function is only called for gevent worker.
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# from gevent docs (https://www.gevent.org/api/gevent.monkey.html):
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# You can also subscribe to the events to provide additional patching beyond what gevent distributes, either for
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# additional standard library modules, or for third-party packages. The suggested time to do this patching is in
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# the subscriber for gevent.events.GeventDidPatchBuiltinModulesEvent.
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if not isinstance(event, gevent_events.GeventDidPatchBuiltinModulesEvent):
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return
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# grpc gevent
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grpc_gevent.init_gevent()
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print("gRPC patched with gevent.", flush=True) # noqa: T201
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pscycogreen_gevent.patch_psycopg()
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print("psycopg2 patched with gevent.", flush=True) # noqa: T201
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gevent_events.subscribers.append(post_patch)
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