gunicorn_config.py

import os
import socket
import sys
import traceback

import eventlet
import gunicorn
from gds_metrics.gunicorn import child_exit  # noqa

workers = 5
worker_class = "eventlet"
errorlog = "/home/vcap/logs/gunicorn_error.log"
bind = f"0.0.0.0:{os.getenv('PORT')}"
disable_redirect_access_to_syslog = True
gunicorn.SERVER_SOFTWARE = "None"
keepalive = 90


def worker_abort(worker):
    worker.log.info("worker received ABORT")
    for stack in sys._current_frames().values():
        worker.log.error("".join(traceback.format_stack(stack)))


def fix_ssl_monkeypatching():
    """
    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
    :scream:
    https://github.com/eventlet/eventlet/issues/692
    """
    # this has probably already been called somewhere in gunicorn internals, however, to be sure, we invoke it again.
    # eventlet.monkey_patch can be called multiple times without issue
    eventlet.monkey_patch()
    eventlet.green.ssl.timeout_exc = socket.timeout


fix_ssl_monkeypatching()