code.grnet.gr Git - flowspy/blob - utils/proxy.py

   1 import nxpy as np
   2 from ncclient import manager
   3 from ncclient.transport.errors import AuthenticationError, SSHError
   4 from lxml import etree as ET
   5 from django.conf import settings
   6 import logging
   7 from django.core.cache import cache
   8
   9 FORMAT = '%(asctime)s %(levelname)s: %(message)s'
  10 logging.basicConfig(format=FORMAT)
  11 logger = logging.getLogger(__name__)
  12 logger.setLevel(logging.DEBUG)
  13
  14 class Retriever(object):
  15     def __init__(self, device=settings.NETCONF_DEVICE, username=settings.NETCONF_USER, password=settings.NETCONF_PASS, filter=settings.ROUTES_FILTER, route_name=None, xml=None):
  16         self.device = device
  17         self.username = username
  18         self.password = password
  19         self.filter = filter
  20         self.xml = xml
  21         if route_name:
  22             self.filter = settings.ROUTE_FILTER%route_name
  23
  24     def fetch_xml(self):
  25         with manager.connect(host=self.device, port=830, username=self.username, password=self.password) as m:
  26             xmlconfig = m.get_config(source='running', filter=('subtree',self.filter)).data_xml
  27         return xmlconfig
  28
  29     def proccess_xml(self):
  30         if self.xml:
  31             xmlconfig = self.xml
  32         else:
  33             xmlconfig = self.fetch_xml()
  34         parser = np.Parser()
  35         parser.confile = xmlconfig
  36         device = parser.export()
  37         return device
  38
  39     def fetch_device(self):
  40         device = cache.get("device")
  41         if device:
  42             return device
  43         else:
  44             device = self.proccess_xml()
  45             if device.routing_options:
  46                 cache.set("device", device, 600)
  47                 return device
  48             else:
  49                 return False
  50
  51 class Applier(object):
  52     def __init__(self, route_objects = [], route_object=None, device=settings.NETCONF_DEVICE, username=settings.NETCONF_USER, password=settings.NETCONF_PASS):
  53         self.route_object = route_object
  54         self.route_objects = route_objects
  55         self.device = device
  56         self.username = username
  57         self.password = password
  58
  59     def to_xml(self, operation=None):
  60         logger.info("Operation: %s"%operation)
  61         if self.route_object:
  62             logger.info("Generating XML config")
  63             route_obj = self.route_object
  64             device = np.Device()
  65             flow = np.Flow()
  66             route = np.Route()
  67             flow.routes.append(route)
  68             device.routing_options.append(flow)
  69             route.name = route_obj.name
  70             if operation == "delete":
  71                 logger.info("Requesting a delete operation")
  72                 route.operation = operation
  73                 device = device.export(netconf_config=True)
  74                 return ET.tostring(device)
  75             if route_obj.source:
  76                 route.match['source'].append(route_obj.source)
  77             if route_obj.destination:
  78                 route.match['destination'].append(route_obj.destination)
  79             if route_obj.protocol:
  80                 route.match['protocol'].append(route_obj.protocol)
  81             try:
  82                 if route_obj.port:
  83                     for port in route_obj.port.all():
  84                         route.match['port'].append(port.port)
  85             except:
  86                 pass
  87             try:
  88                 if route_obj.destinationport:
  89                     for port in route_obj.destinationport.all():
  90                         route.match['destination-port'].append(port.port)
  91             except:
  92                 pass
  93             try:
  94                 if route_obj.sourceport:
  95                     for port in route_obj.sourceport.all():
  96                         route.match['source-port'].append(port.port)
  97             except:
  98                 pass
  99             if route_obj.icmpcode:
 100                 route.match['icmp-code'].append(route_obj.icmpcode)
 101             if route_obj.icmptype:
 102                 route.match['icmp-type'].append(route_obj.icmptype)
 103             if route_obj.tcpflag:
 104                 route.match['tcp-flags'].append(route_obj.tcpflag)
 105             try:
 106                 if route_obj.dscp:
 107                     for dscp in route_obj.dscp.all():
 108                         route.match['dscp'].append(dscp.dscp)
 109             except:
 110                 pass
 111             if route_obj.fragmenttype:
 112                 route.match['fragment'].append(route_obj.fragmenttype)
 113             for thenaction in route_obj.then.all():
 114                 if thenaction.action_value:
 115                     route.then[thenaction.action] = thenaction.action_value
 116                 else:
 117                     route.then[thenaction.action] = True
 118             if operation == "replace":
 119                 logger.info("Requesting a replace operation")
 120                 route.operation = operation
 121             device = device.export(netconf_config=True)
 122             return ET.tostring(device)
 123         else:
 124             return False
 125
 126     def delete_routes(self):
 127         if self.route_objects:
 128             logger.info("Generating XML config")
 129             device = np.Device()
 130             flow = np.Flow()
 131             for route_object in self.route_objects:
 132                 route_obj = route_object
 133                 route = np.Route()
 134                 flow.routes.append(route)
 135                 route.name = route_obj.name
 136                 route.operation = 'delete'
 137             device.routing_options.append(flow)
 138             device = device.export(netconf_config=True)
 139             return ET.tostring(device)
 140         else:
 141             return False
 142
 143     def apply(self, configuration = None, operation=None):
 144         reason = None
 145         if not configuration:
 146             configuration = self.to_xml(operation=operation)
 147         edit_is_successful = False
 148         commit_confirmed_is_successful = False
 149         commit_is_successful = False
 150         if configuration:
 151             with manager.connect(host=self.device, port=830, username=self.username, password=self.password) as m:
 152                 assert(":candidate" in m.server_capabilities)
 153                 with m.locked(target='candidate'):
 154                     m.discard_changes()
 155                     try:
 156                         edit_response = m.edit_config(target='candidate', config=configuration, test_option='test-then-set')
 157                         edit_is_successful, reason = is_successful(edit_response)
 158                         logger.info("Successfully edited @ %s" % self.device)
 159                         if not edit_is_successful:
 160                             raise Exception()
 161                     except Exception as e:
 162                         cause="Caught edit exception: %s %s" %(e,reason)
 163                         cause=cause.replace('\n', '')
 164                         logger.error(cause)
 165                         m.discard_changes()
 166                         return False, cause
 167                     if edit_is_successful:
 168                         try:
 169                             commit_confirmed_response = m.commit(confirmed=True, timeout=settings.COMMIT_CONFIRMED_TIMEOUT)
 170                             commit_confirmed_is_successful, reason = is_successful(commit_confirmed_response)
 171
 172                             if not commit_confirmed_is_successful:
 173                                 raise Exception()
 174                             else:
 175                                 logger.info("Successfully confirmed committed @ %s" % self.device)
 176                                 if not settings.COMMIT:
 177                                     return True, "Successfully confirmed committed"
 178                         except Exception as e:
 179                             cause="Caught commit confirmed exception: %s %s" %(e,reason)
 180                             cause=cause.replace('\n', '')
 181                             logger.error(cause)
 182                             return False, cause
 183                         if settings.COMMIT:
 184                             if edit_is_successful and commit_confirmed_is_successful:
 185                                 try:
 186                                     commit_response = m.commit(confirmed=False)
 187                                     commit_is_successful, reason = is_successful(commit_response)
 188                                     logger.info("Successfully committed @ %s" % self.device)
 189                                     newconfig = m.get_config(source='running', filter=('subtree',settings.ROUTES_FILTER)).data_xml
 190                                     retrieve = Retriever(xml=newconfig)
 191                                     cache.set("device", retrieve.proccess_xml(), 600)
 192
 193                                     if not commit_is_successful:
 194                                         raise Exception()
 195                                     else:
 196                                         logger.info("Successfully cached device configuration")
 197                                         return True, "Successfully committed"
 198                                 except Exception as e:
 199                                     cause="Caught commit exception: %s %s" %(e,reason)
 200                                     cause=cause.replace('\n', '')
 201                                     logger.error(cause)
 202                                     return False, cause
 203         else:
 204             return False, "No configuration was supplied"
 205
 206 def is_successful(response):
 207     from StringIO import StringIO
 208     doc = parsexml_(StringIO(response))
 209     rootNode = doc.getroot()
 210     success_list = rootNode.xpath("//*[local-name()='ok']")
 211     if len(success_list)>0:
 212         return True, None
 213     else:
 214         reason_return = ''
 215         reason_list = rootNode.xpath("//*[local-name()='error-message']")
 216         for reason in reason_list:
 217             reason_return = "%s %s" %(reason_return, reason.text)
 218         return False, reason_return
 219
 220
 221 def parsexml_(*args, **kwargs):
 222     if 'parser' not in kwargs:
 223         kwargs['parser'] = ET.ETCompatXMLParser()
 224     doc = ET.parse(*args, **kwargs)
 225     return doc
 226