meinheld.patch#patch_socket した時に mongoengine? pymongo がエラーを吐くのを回避するには、コネクト用関数を用意して meinheld.server#spawn に渡すと良いっぽい :-)

lib.py

# vim: fileencoding=utf-8 :

import logging

from mongoengine import *


__all__ = ('connect_to_mongodb', 'AccessLog',)


def connect_to_mongodb():
  logging.info("connect to mongodb")
  connect("spam")


class AccessLog(Document):
  time = FloatField(required=True)

main.py

# vim: fileencoding=utf-8 :

import time
import logging

from meinheld import (
  server, patch,
)
from lib import *

patch.patch_socket()

logging.basicConfig(level=logging.DEBUG)


def app(environ, start_response):
  # store new object.
  AccessLog(time=time.time()).save()
  # retrieve all objects.
  logging.info("log count: %s", len(AccessLog.objects))
  # create response.
  body = "hello world."
  start_response("200 OK", [
    ('Content-Type', 'text/plain; charset=utf-8'),
    ('Content-Length', str(len(body))),
  ])
  return [body]


if __name__ == '__main__':
  server.spawn(connect_to_mongodb)
  server.listen(('0.0.0.0', 8000))
  server.run(app)

test.py

>>> from lib import *
>>> AccessLog.objects