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# Copyright 2013 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import functools
import os
from oslo_log import log
LOG = log.getLogger(__name__)
__all__ = ['Server', 'httplib', 'subprocess']
_configured = False
Server = None
httplib = None
subprocess = None
def configure_once(name):
"""Ensure that environment configuration is only run once.
If environment is reconfigured in the same way then it is ignored.
It is an error to attempt to reconfigure environment in a different way.
"""
def decorator(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
global _configured
if _configured:
if _configured == name:
return
else:
raise SystemError("Environment has already been "
"configured as %s" % _configured)
LOG.debug("Environment configured as: %s", name)
_configured = name
return func(*args, **kwargs)
return wrapper
return decorator
@configure_once('eventlet')
def use_eventlet(monkeypatch_thread=None):
global httplib, subprocess, Server
# This must be set before the initial import of eventlet because if
# dnspython is present in your environment then eventlet monkeypatches
# socket.getaddrinfo() with an implementation which doesn't work for IPv6.
os.environ['EVENTLET_NO_GREENDNS'] = 'yes'
import eventlet
from eventlet.green import httplib as _httplib
from eventlet.green import subprocess as _subprocess
from keystone.common.environment import eventlet_server
if monkeypatch_thread is None:
monkeypatch_thread = not os.getenv('STANDARD_THREADS')
# Raise the default from 8192 to accommodate large tokens
eventlet.wsgi.MAX_HEADER_LINE = 16384
# NOTE(ldbragst): Explicitly declare what should be monkey patched and
# what shouldn't. Doing this allows for more readable code when
# understanding Eventlet in Keystone. The following is a complete list
# of what is monkey patched instead of passing all=False and then passing
# module=True to monkey patch a specific module.
eventlet.patcher.monkey_patch(os=False, select=True, socket=True,
thread=monkeypatch_thread, time=True,
psycopg=False, MySQLdb=False)
Server = eventlet_server.Server
httplib = _httplib
subprocess = _subprocess
@configure_once('stdlib')
def use_stdlib():
global httplib, subprocess
import httplib as _httplib
import subprocess as _subprocess
httplib = _httplib
subprocess = _subprocess
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