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# Copyright 2012 OpenStack Foundation
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2010 OpenStack Foundation
# All Rights Reserved.
#
# 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 errno
import re
import socket
import ssl
import sys
import eventlet
import eventlet.wsgi
import greenlet
from oslo_log import log
from oslo_log import loggers
from keystone.i18n import _LE, _LI
LOG = log.getLogger(__name__)
# The size of a pool that is used to spawn a single green thread in which
# a wsgi server is then started. The size of one is enough, because in case
# of several workers the parent process forks and each child gets a copy
# of a pool, which does not include any greenthread object as the spawn is
# done after the fork.
POOL_SIZE = 1
class EventletFilteringLogger(loggers.WritableLogger):
# NOTE(morganfainberg): This logger is designed to filter out specific
# Tracebacks to limit the amount of data that eventlet can log. In the
# case of broken sockets (EPIPE and ECONNRESET), we are seeing a huge
# volume of data being written to the logs due to ~14 lines+ per traceback.
# The traceback in these cases are, at best, useful for limited debugging
# cases.
def __init__(self, *args, **kwargs):
super(EventletFilteringLogger, self).__init__(*args, **kwargs)
self.regex = re.compile(r'errno (%d|%d)' %
(errno.EPIPE, errno.ECONNRESET), re.IGNORECASE)
def write(self, msg):
m = self.regex.search(msg)
if m:
self.logger.log(log.logging.DEBUG, 'Error(%s) writing to socket.',
m.group(1))
else:
self.logger.log(self.level, msg.rstrip())
class Server(object):
"""Server class to manage multiple WSGI sockets and applications."""
def __init__(self, application, host=None, port=None, keepalive=False,
keepidle=None):
self.application = application
self.host = host or '0.0.0.0'
self.port = port or 0
# Pool for a green thread in which wsgi server will be running
self.pool = eventlet.GreenPool(POOL_SIZE)
self.socket_info = {}
self.greenthread = None
self.do_ssl = False
self.cert_required = False
self.keepalive = keepalive
self.keepidle = keepidle
self.socket = None
def listen(self, key=None, backlog=128):
"""Create and start listening on socket.
Call before forking worker processes.
Raises Exception if this has already been called.
"""
# TODO(dims): eventlet's green dns/socket module does not actually
# support IPv6 in getaddrinfo(). We need to get around this in the
# future or monitor upstream for a fix.
# Please refer below link
# (https://bitbucket.org/eventlet/eventlet/
# src/e0f578180d7d82d2ed3d8a96d520103503c524ec/eventlet/support/
# greendns.py?at=0.12#cl-163)
info = socket.getaddrinfo(self.host,
self.port,
socket.AF_UNSPEC,
socket.SOCK_STREAM)[0]
try:
self.socket = eventlet.listen(info[-1], family=info[0],
backlog=backlog)
except EnvironmentError:
LOG.error(_LE("Could not bind to %(host)s:%(port)s"),
{'host': self.host, 'port': self.port})
raise
LOG.info(_LI('Starting %(arg0)s on %(host)s:%(port)s'),
{'arg0': sys.argv[0],
'host': self.host,
'port': self.port})
def start(self, key=None, backlog=128):
"""Run a WSGI server with the given application."""
if self.socket is None:
self.listen(key=key, backlog=backlog)
dup_socket = self.socket.dup()
if key:
self.socket_info[key] = self.socket.getsockname()
# SSL is enabled
if self.do_ssl:
if self.cert_required:
cert_reqs = ssl.CERT_REQUIRED
else:
cert_reqs = ssl.CERT_NONE
dup_socket = eventlet.wrap_ssl(dup_socket, certfile=self.certfile,
keyfile=self.keyfile,
server_side=True,
cert_reqs=cert_reqs,
ca_certs=self.ca_certs)
# Optionally enable keepalive on the wsgi socket.
if self.keepalive:
dup_socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
if self.keepidle is not None:
dup_socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE,
self.keepidle)
self.greenthread = self.pool.spawn(self._run,
self.application,
dup_socket)
def set_ssl(self, certfile, keyfile=None, ca_certs=None,
cert_required=True):
self.certfile = certfile
self.keyfile = keyfile
self.ca_certs = ca_certs
self.cert_required = cert_required
self.do_ssl = True
def stop(self):
if self.greenthread is not None:
self.greenthread.kill()
def wait(self):
"""Wait until all servers have completed running."""
try:
self.pool.waitall()
except KeyboardInterrupt:
pass
except greenlet.GreenletExit:
pass
def reset(self):
"""Required by the service interface.
The service interface is used by the launcher when receiving a
SIGHUP. The service interface is defined in
keystone.openstack.common.service.Service.
Keystone does not need to do anything here.
"""
pass
def _run(self, application, socket):
"""Start a WSGI server with a new green thread pool."""
logger = log.getLogger('eventlet.wsgi.server')
try:
eventlet.wsgi.server(socket, application,
log=EventletFilteringLogger(logger),
debug=False)
except greenlet.GreenletExit:
# Wait until all servers have completed running
pass
except Exception:
LOG.exception(_LE('Server error'))
raise
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