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OpenStack Study: namespace_proxy.py**** CubicPower OpenStack Study ****
# vim: tabstop=4 shiftwidth=4 softtabstop=4 # # Copyright 2012 New Dream Network, LLC (DreamHost) # # 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. # # @author: Mark McClain, DreamHost import httplib import socket import eventlet import httplib2 from oslo.config import cfg import six.moves.urllib.parse as urlparse import webob from neutron.agent.linux import daemon from neutron.common import config from neutron.common import utils from neutron.openstack.common import log as logging from neutron import wsgi LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class UnixDomainHTTPConnection(httplib.HTTPConnection): """Connection class for HTTP over UNIX domain socket."""
**** CubicPower OpenStack Study **** def __init__(self, host, port=None, strict=None, timeout=None, proxy_info=None): httplib.HTTPConnection.__init__(self, host, port, strict) self.timeout = timeout
**** CubicPower OpenStack Study **** def connect(self): self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) if self.timeout: self.sock.settimeout(self.timeout) self.sock.connect(cfg.CONF.metadata_proxy_socket)
**** CubicPower OpenStack Study **** class NetworkMetadataProxyHandler(object): """Proxy AF_INET metadata request through Unix Domain socket. The Unix domain socket allows the proxy access resource that are not accessible within the isolated tenant context. """
**** CubicPower OpenStack Study **** def __init__(self, network_id=None, router_id=None): self.network_id = network_id self.router_id = router_id if network_id is None and router_id is None: msg = _('network_id and router_id are None. One must be provided.') raise ValueError(msg) @webob.dec.wsgify(RequestClass=webob.Request)
**** CubicPower OpenStack Study **** def __call__(self, req): LOG.debug(_("Request: %s"), req) try: return self._proxy_request(req.remote_addr, req.method, req.path_info, req.query_string, req.body) except Exception: LOG.exception(_("Unexpected error.")) msg = _('An unknown error has occurred. ' 'Please try your request again.') return webob.exc.HTTPInternalServerError(explanation=unicode(msg))
**** CubicPower OpenStack Study **** def _proxy_request(self, remote_address, method, path_info, query_string, body): headers = { 'X-Forwarded-For': remote_address, } if self.router_id: headers['X-Neutron-Router-ID'] = self.router_id else: headers['X-Neutron-Network-ID'] = self.network_id url = urlparse.urlunsplit(( 'http', '169.254.169.254', # a dummy value to make the request proper path_info, query_string, '')) h = httplib2.Http() resp, content = h.request( url, method=method, headers=headers, body=body, connection_type=UnixDomainHTTPConnection) if resp.status == 200: LOG.debug(resp) LOG.debug(content) response = webob.Response() response.status = resp.status response.headers['Content-Type'] = resp['content-type'] response.body = content return response elif resp.status == 404: return webob.exc.HTTPNotFound() elif resp.status == 409: return webob.exc.HTTPConflict() elif resp.status == 500: msg = _( 'Remote metadata server experienced an internal server error.' ) LOG.debug(msg) return webob.exc.HTTPInternalServerError(explanation=unicode(msg)) else: raise Exception(_('Unexpected response code: %s') % resp.status)
**** CubicPower OpenStack Study **** class ProxyDaemon(daemon.Daemon):
**** CubicPower OpenStack Study **** def __init__(self, pidfile, port, network_id=None, router_id=None): uuid = network_id or router_id super(ProxyDaemon, self).__init__(pidfile, uuid=uuid) self.network_id = network_id self.router_id = router_id self.port = port
**** CubicPower OpenStack Study **** def run(self): handler = NetworkMetadataProxyHandler( self.network_id, self.router_id) proxy = wsgi.Server('neutron-network-metadata-proxy') proxy.start(handler, self.port) proxy.wait() def main(): eventlet.monkey_patch() opts = [ cfg.StrOpt('network_id', help=_('Network that will have instance metadata ' 'proxied.')), cfg.StrOpt('router_id', help=_('Router that will have connected instances\' ' 'metadata proxied.')), cfg.StrOpt('pid_file', help=_('Location of pid file of this process.')), cfg.BoolOpt('daemonize', default=True, help=_('Run as daemon.')), cfg.IntOpt('metadata_port', default=9697, help=_("TCP Port to listen for metadata server " "requests.")), cfg.StrOpt('metadata_proxy_socket', default='$state_path/metadata_proxy', help=_('Location of Metadata Proxy UNIX domain ' 'socket')) ] cfg.CONF.register_cli_opts(opts) # Don't get the default configuration file cfg.CONF(project='neutron', default_config_files=[]) config.setup_logging(cfg.CONF) utils.log_opt_values(LOG) proxy = ProxyDaemon(cfg.CONF.pid_file, cfg.CONF.metadata_port, network_id=cfg.CONF.network_id, router_id=cfg.CONF.router_id) if cfg.CONF.daemonize: proxy.start() else: proxy.run()
**** CubicPower OpenStack Study **** def main(): eventlet.monkey_patch() opts = [ cfg.StrOpt('network_id', help=_('Network that will have instance metadata ' 'proxied.')), cfg.StrOpt('router_id', help=_('Router that will have connected instances\' ' 'metadata proxied.')), cfg.StrOpt('pid_file', help=_('Location of pid file of this process.')), cfg.BoolOpt('daemonize', default=True, help=_('Run as daemon.')), cfg.IntOpt('metadata_port', default=9697, help=_("TCP Port to listen for metadata server " "requests.")), cfg.StrOpt('metadata_proxy_socket', default='$state_path/metadata_proxy', help=_('Location of Metadata Proxy UNIX domain ' 'socket')) ] cfg.CONF.register_cli_opts(opts) # Don't get the default configuration file cfg.CONF(project='neutron', default_config_files=[]) config.setup_logging(cfg.CONF) utils.log_opt_values(LOG) proxy = ProxyDaemon(cfg.CONF.pid_file, cfg.CONF.metadata_port, network_id=cfg.CONF.network_id, router_id=cfg.CONF.router_id) if cfg.CONF.daemonize: proxy.start() else: proxy.run()
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