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https://github.com/GSA/notifications-api.git
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a2cbe20325
eventlet works by monkey-patching core IO libraries (such as ssl) to be
non-blocking. However, there's currently a bug: In the normal socket
library it may throw a timeout error as a `socket.timeout` exception.
However eventlet.green.ssl's patch raises an ssl.SSLError('timed out',)
instead. redispy handles socket.timeout but not ssl.SSLError, so we
solve this by monkey patching the monkey patching code to raise the
correct exception type 😱
Note: This code should _only_ be called when we're using eventlets, or
we'll run into issues with regular code failing with max recursion
errors. With that in mind we put this code in gunicorn_config, as that
isn't imported when we run celery or run flask locally.
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
import os
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import sys
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import traceback
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import gunicorn
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import eventlet
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import socket
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from gds_metrics.gunicorn import child_exit # noqa
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workers = 4
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worker_class = "eventlet"
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worker_connections = 256
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errorlog = "/home/vcap/logs/gunicorn_error.log"
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bind = "0.0.0.0:{}".format(os.getenv("PORT"))
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statsd_host = "{}:8125".format(os.getenv("STATSD_HOST"))
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gunicorn.SERVER_SOFTWARE = 'None'
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def on_starting(server):
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server.log.info("Starting Notifications API")
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def worker_abort(worker):
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worker.log.info("worker received ABORT {}".format(worker.pid))
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for _threadId, stack in sys._current_frames().items():
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worker.log.error(''.join(traceback.format_stack(stack)))
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def on_exit(server):
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server.log.info("Stopping Notifications API")
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def worker_int(worker):
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worker.log.info("worker: received SIGINT {}".format(worker.pid))
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def fix_ssl_monkeypatching():
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"""
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eventlet works by monkey-patching core IO libraries (such as ssl) to be non-blocking. However, there's currently
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a bug: In the normal socket library it may throw a timeout error as a `socket.timeout` exception. However
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eventlet.green.ssl's patch raises an ssl.SSLError('timed out',) instead. redispy handles socket.timeout but not
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ssl.SSLError, so we solve this by monkey patching the monkey patching code to raise the correct exception type
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:scream:
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https://github.com/eventlet/eventlet/issues/692
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"""
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# this has probably already been called somewhere in gunicorn internals, however, to be sure, we invoke it again.
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# eventlet.monkey_patch can be called multiple times without issue
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eventlet.monkey_patch()
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eventlet.green.ssl.timeout_exc = socket.timeout
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fix_ssl_monkeypatching()
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