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  # Copyright 2013 PLUMgrid, Inc. 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.
  #
  # @author: Edgar Magana, emagana@plumgrid.com, PLUMgrid, Inc.
  # @author: Brenden Blanco, bblanco@plumgrid.com, PLUMgrid, Inc.
  
  """
  Quantum PLUMgrid Plug-in for PLUMgrid Virtual Technology
  This plugin will forward authenticated REST API calls
  to the Network Operating System by PLUMgrid called NOS
  """
  
  import httplib
  import urllib2
  
  from quantum.openstack.common import jsonutils as json
  from quantum.openstack.common import log as logging
  from quantum.plugins.plumgrid.common import exceptions as plum_excep
  
  
  LOG = logging.getLogger(__name__)
  
  
  class RestConnection(object):
      """REST Connection to PLUMgrid NOS Server."""
  
      def __init__(self, server, port, timeout):
          LOG.debug(_('QuantumPluginPLUMgrid Status: REST Connection Started'))
          self.server = server
          self.port = port
          self.timeout = timeout
  
      def nos_rest_conn(self, nos_url, action, data, headers):
          self.nos_url = nos_url
          body_data = json.dumps(data)
          if not headers:
              headers = {}
          headers['Content-type'] = 'application/json'
          headers['Accept'] = 'application/json'
  
          LOG.debug(_("PLUMgrid_NOS_Server: %s %s %s"), self.server, self.port,
                    action)
  
          conn = httplib.HTTPConnection(self.server, self.port,
                                        timeout=self.timeout)
          if conn is None:
              LOG.error(_('PLUMgrid_NOS_Server: Could not establish HTTP '
                          'connection'))
              return
  
          try:
              LOG.debug(_("PLUMgrid_NOS_Server Sending Data: %s %s %s"),
                        nos_url, body_data, headers)
              conn.request(action, nos_url, body_data, headers)
              resp = conn.getresponse()
              resp_str = resp.read()
  
              LOG.debug(_("PLUMgrid_NOS_Server Connection Data: %s, %s"),
                        resp, resp_str)
  
              if resp.status is httplib.OK:
                  try:
                      respdata = json.loads(resp_str)
                      LOG.debug(_("PLUMgrid_NOS_Server Connection RESP: %s"),
                                respdata)
                      pass
                  except ValueError:
                      err_message = _("PLUMgrid HTTP Connection Failed: ")
                      LOG.Exception(err_message)
                      raise plum_excep.PLUMgridException(err_message)
  
              ret = (resp.status, resp.reason, resp_str)
          except urllib2.HTTPError, e:
              LOG.error(_('PLUMgrid_NOS_Server: %(action)s failure, %(e)r'))
              ret = 0, None, None, None
          conn.close()
          LOG.debug(_("PLUMgrid_NOS_Server: status=%(status)d, "
                    "reason=%(reason)r, ret=%(ret)s"),
                    {'status': ret[0], 'reason': ret[1], 'ret': ret[2]})
          return ret
  