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# Copyright (c) 2012 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.
'''
Websocket proxy that is compatible with OpenStack Nova.
Leverages websockify.py by Joel Martin
'''
import Cookie
import socket
import websockify
from nova.consoleauth import rpcapi as consoleauth_rpcapi
from nova import context
from nova.openstack.common.gettextutils import _
from nova.openstack.common import log as logging
LOG = logging.getLogger(__name__)
class NovaProxyRequestHandlerBase(object):
def new_websocket_client(self):
"""Called after a new WebSocket connection has been established."""
# Reopen the eventlet hub to make sure we don't share an epoll
# fd with parent and/or siblings, which would be bad
from eventlet import hubs
hubs.use_hub()
cookie = Cookie.SimpleCookie()
cookie.load(self.headers.getheader('cookie'))
token = cookie['token'].value
ctxt = context.get_admin_context()
rpcapi = consoleauth_rpcapi.ConsoleAuthAPI()
connect_info = rpcapi.check_token(ctxt, token=token)
if not connect_info:
raise Exception(_("Invalid Token"))
self.msg(_('connect info: %s'), str(connect_info))
host = connect_info['host']
port = int(connect_info['port'])
# Connect to the target
self.msg(_("connecting to: %(host)s:%(port)s") % {'host': host,
'port': port})
tsock = self.socket(host, port, connect=True)
# Handshake as necessary
if connect_info.get('internal_access_path'):
tsock.send("CONNECT %s HTTP/1.1\r\n\r\n" %
connect_info['internal_access_path'])
while True:
data = tsock.recv(4096, socket.MSG_PEEK)
if data.find("\r\n\r\n") != -1:
if not data.split("\r\n")[0].find("200"):
raise Exception(_("Invalid Connection Info"))
tsock.recv(len(data))
break
# Start proxying
try:
self.do_proxy(tsock)
except Exception:
if tsock:
tsock.shutdown(socket.SHUT_RDWR)
tsock.close()
self.vmsg(_("%(host)s:%(port)s: Target closed") %
{'host': host, 'port': port})
raise
# TODO(sross): when the websockify version is bumped to be >=0.6,
# remove the if-else statement and make the if branch
# contents the only code.
if getattr(websockify, 'ProxyRequestHandler', None) is not None:
class NovaProxyRequestHandler(NovaProxyRequestHandlerBase,
websockify.ProxyRequestHandler):
def __init__(self, *args, **kwargs):
websockify.ProxyRequestHandler.__init__(self, *args, **kwargs)
def socket(self, *args, **kwargs):
return websockify.WebSocketServer.socket(*args, **kwargs)
class NovaWebSocketProxy(websockify.WebSocketProxy):
@staticmethod
def get_logger():
return LOG
else:
import sys
class NovaWebSocketProxy(NovaProxyRequestHandlerBase,
websockify.WebSocketProxy):
def __init__(self, *args, **kwargs):
del kwargs['traffic']
del kwargs['RequestHandlerClass']
websockify.WebSocketProxy.__init__(self, *args,
target_host='ignore',
target_port='ignore',
unix_target=None,
target_cfg=None,
ssl_target=None,
**kwargs)
def new_client(self):
self.new_websocket_client()
def msg(self, *args, **kwargs):
LOG.info(*args, **kwargs)
def vmsg(self, *args, **kwargs):
LOG.debug(*args, **kwargs)
def warn(self, *args, **kwargs):
LOG.warn(*args, **kwargs)
def print_traffic(self, token="."):
if self.traffic:
sys.stdout.write(token)
sys.stdout.flush()
class NovaProxyRequestHandler(object):
pass
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