sfa/rspecs/sfa_rspec.py

   1 #!/usr/bin/python
   2 from lxml import etree
   3 from StringIO import StringIO
   4 from sfa.rspecs.rspec import RSpec
   5 from sfa.util.xrn import *
   6 from sfa.util.plxrn import hostname_to_urn
   7 from sfa.util.config import Config
   8 from sfa.rspecs.rspec_version import RSpecVersion
   9
  10
  11 _version = { 'type': 'SFA',
  12              'version': '1'
  13 }
  14
  15 sfa_rspec_version = RSpecVersion(_sfa_rspec_version)
  16
  17 class SfaRSpec(RSpec):
  18     xml = None
  19     header = '<?xml version="1.0"?>\n'
  20     version = sfa_rspec_version
  21
  22     ###################
  23     # Parser
  24     ###################
  25     def get_network_elements(self):
  26         return self.xml.xpath('//network')
  27
  28     def get_networks(self):
  29         return self.xml.xpath('//network[@name]/@name')
  30
  31     def get_node_element(self, hostname, network=None):
  32         if network:
  33             names = self.xml.xpath('//network[@name="%s"]//node/hostname' % network)
  34         else:
  35             names = self.xml.xpath('//node/hostname')
  36         for name in names:
  37             if name.text == hostname:
  38                 return name.getparent()
  39         return None
  40
  41     def get_node_elements(self, network=None):
  42         if network:
  43             return self.xml.xpath('//network[@name="%s"]//node' % network)
  44         else:
  45             return self.xml.xpath('//node')
  46
  47     def get_nodes(self, network=None):
  48         if network == None:
  49             nodes = self.xml.xpath('//node/hostname/text()')
  50         else:
  51             nodes = self.xml.xpath('//network[@name="%s"]//node/hostname/text()' % network)
  52         return nodes
  53
  54     def get_nodes_with_slivers(self, network = None):
  55         if network:
  56             return self.xml.xpath('//network[@name="%s"]//node[sliver]/hostname/text()' % network)
  57         else:
  58             return self.xml.xpath('//node[sliver]/hostname/text()')
  59
  60     def get_nodes_without_slivers(self, network=None):
  61         xpath_nodes_without_slivers = '//node[not(sliver)]/hostname/text()'
  62         xpath_nodes_without_slivers_in_network = '//network[@name="%s"]//node[not(sliver)]/hostname/text()'
  63         if network:
  64             return self.xml.xpath('//network[@name="%s"]//node[not(sliver)]/hostname/text()' % network)
  65         else:
  66             return self.xml.xpath('//node[not(sliver)]/hostname/text()')
  67
  68
  69     def attributes_list(self, elem):
  70         # convert a list of attribute tags into list of tuples
  71         # (tagnme, text_value)
  72         opts = []
  73         if elem is not None:
  74             for e in elem:
  75                 opts.append((e.tag, e.text))
  76         return opts
  77
  78     def get_default_sliver_attributes(self, network=None):
  79         if network:
  80             defaults = self.xml.xpath("//network[@name='%s']/sliver_defaults" % network)
  81         else:
  82             defaults = self.xml.xpath("//network/sliver_defaults" % network)
  83         return self.attributes_list(defaults)
  84
  85     def get_sliver_attributes(self, hostname, network=None):
  86         node = self.get_node_element(hostname, network)
  87         sliver = node.find("sliver")
  88         return self.attributes_list(sliver)
  89
  90     def get_site_nodes(self, siteid, network=None):
  91         if network:
  92             nodes = self.xml.xpath('//network[@name="%s"]/site[@id="%s"]/node/hostname/text()' % \
  93                                     (network, siteid))
  94         else:
  95             nodes = self.xml.xpath('//site[@id="%s"]/node/hostname/text()' % siteid)
  96         return nodes
  97
  98     def get_links(self, network=None):
  99         if network:
 100             links = self.xml.xpath('//network[@name="%s"]/link' % network)
 101         else:
 102             links = self.xml.xpath('//link')
 103         linklist = []
 104         for link in links:
 105             (end1, end2) = link.get("endpoints").split()
 106             name = link.find("description")
 107             linklist.append((name.text,
 108                              self.get_site_nodes(end1, network),
 109                              self.get_site_nodes(end2, network)))
 110         return linklist
 111
 112     def get_link(self, fromnode, tonode, network=None):
 113         fromsite = fromnode.getparent()
 114         tosite = tonode.getparent()
 115         fromid = fromsite.get("id")
 116         toid = tosite.get("id")
 117         if network:
 118             query = "//network[@name='%s']" % network + "/link[@endpoints = '%s %s']"
 119         else:
 120             query = "//link[@endpoints = '%s %s']"
 121
 122         results = self.rspec.xpath(query % (fromid, toid))
 123         if not results:
 124             results = self.rspec.xpath(query % (toid, fromid))
 125         return results
 126
 127     def query_links(self, fromnode, tonode, network=None):
 128         return get_link(fromnode, tonode, network)
 129
 130     def get_vlinks(self, network=None):
 131         vlinklist = []
 132         if network:
 133             vlinks = self.xml.xpath("//network[@name='%s']//vlink" % network)
 134         else:
 135             vlinks = self.xml.xpath("//vlink")
 136         for vlink in vlinks:
 137             endpoints = vlink.get("endpoints")
 138             (end1, end2) = endpoints.split()
 139             if network:
 140                 node1 = self.xml.xpath('//network[@name="%s"]//node[@id="%s"]/hostname/text()' % \
 141                                        (network, end1))[0]
 142                 node2 = self.xml.xpath('//network[@name="%s"]//node[@id="%s"]/hostname/text()' % \
 143                                        (network, end2))[0]
 144             else:
 145                 node1 = self.xml.xpath('//node[@id="%s"]/hostname/text()' % end1)[0]
 146                 node2 = self.xml.xpath('//node[@id="%s"]/hostname/text()' % end2)[0]
 147             desc = "%s <--> %s" % (node1, node2)
 148             kbps = vlink.find("kbps")
 149             vlinklist.append((endpoints, desc, kbps.text))
 150         return vlinklist
 151
 152     def get_vlink(self, endponts, network=None):
 153         if network:
 154             query = "//network[@name='%s']//vlink[@endpoints = '%s']" % (network, endpoints)
 155         else:
 156             query = "//vlink[@endpoints = '%s']" % (network, endpoints)
 157         results = self.rspec.xpath(query)
 158         return results
 159
 160     def query_vlinks(self, endpoints, network=None):
 161         return get_vlink(endpoints,network)
 162
 163     ##################
 164     # Builder
 165     ##################
 166
 167     def add_network(self, network):
 168         network_tag = etree.SubElement(self.xml, 'network', id=network)
 169
 170     def add_nodes(self, nodes, network = None, no_dupes=False):
 171         if not isinstance(nodes, list):
 172             nodes = [nodes]
 173         for node in nodes:
 174             if no_dupes and \
 175               self.get_node_element(node['hostname']):
 176                 # node already exists
 177                 continue
 178
 179             network_tag = self.xml
 180             if 'network' in node:
 181                 network = node['network']
 182                 network_tags = self.xml.xpath('//network[@name="%s"]' % network)
 183                 if not network_tags:
 184                     network_tag = etree.SubElement(self.xml, 'network', name=network)
 185                 else:
 186                     network_tag = network_tags[0]
 187
 188             node_tag = etree.SubElement(network_tag, 'node')
 189             if 'network' in node:
 190                 node_tag.set('component_manager_id', network)
 191             if 'urn' in node:
 192                 node_tag.set('component_id', node['urn'])
 193             if 'site_urn' in node:
 194                 node_tag.set('site_id', node['site_urn'])
 195             if 'node_id' in node:
 196                 node_tag.set('node_id', 'n'+str(node['node_id']))
 197             if 'hostname' in node:
 198                 hostname_tag = etree.SubElement(node_tag, 'hostname').text = node['hostname']
 199             if 'interfaces' in node:
 200                 for interface in node['interfaces']:
 201                     if 'bwlimit' in interface and interface['bwlimit']:
 202                         bwlimit = etree.SubElement(node_tag, 'bw_limit', units='kbps').text = str(interface['bwlimit']/1000)
 203             if 'tags' in node:
 204                 for tag in node['tags']:
 205                    # expose this hard wired list of tags, plus the ones that are marked 'sfa' in their category
 206                    if tag['tagname'] in ['fcdistro', 'arch'] or 'sfa' in tag['category'].split('/'):
 207                         tag_element = etree.SubElement(node_tag, tag['tagname'], value=tag['value'])
 208
 209             if 'site' in node:
 210                 longitude = str(node['site']['longitude'])
 211                 latitude = str(node['site']['latitude'])
 212                 location = etree.SubElement(node_tag, 'location', country='unknown', \
 213                                             longitude=longitude, latitude=latitude)
 214
 215     def add_interfaces(self, interfaces):
 216         pass
 217
 218     def add_links(self, links):
 219         pass
 220
 221     def add_slivers(self, slivers, network=None, no_dupes=False):
 222         if not isinstance(slivers, list):
 223             slivers = [slivers]
 224
 225         nodes_with_slivers = self.get_nodes_with_slivers(network)
 226         for sliver in slivers:
 227             if sliver['hostname'] in nodes_with_slivers:
 228                 continue
 229             node_elem = self.get_node_element(sliver['hostname'], network)
 230             sliver_elem = etree.SubElement(node_elem, 'sliver')
 231             if 'tags' in sliver:
 232                 for tag in sliver['tags']:
 233                     etree.SubElement(sliver_elem, tag['tagname'], value=tag['value'])
 234
 235     def remove_slivers(self, slivers, network=None, no_dupes=False):
 236         if not isinstance(slivers, list):
 237             slivers = [slivers]
 238         for sliver in slivers:
 239             node_elem = self.get_node_element(sliver['hostname'], network)
 240             sliver_elem = node.find('sliver')
 241             if sliver_elem != None:
 242                 node_elem.remove(sliver)
 243
 244     def add_default_sliver_attribute(self, name, value, network=None):
 245         if network:
 246             defaults = self.xml.xpath("//network[@name='%s']/sliver_defaults" % network)
 247         else:
 248             defaults = self.xml.xpath("//sliver_defaults" % network)
 249         if defaults is None:
 250             defaults = etree.Element("sliver_defaults")
 251             network = self.xml.xpath("//network[@name='%s']" % network)
 252             network.insert(0, defaults)
 253         self.add_attribute(defaults, name, value)
 254
 255     def add_sliver_attribute(self, hostname, name, value, network=None):
 256         node = self.get_node_element(hostname, network)
 257         sliver = node.find("sliver")
 258         self.add_attribute(sliver, name, value)
 259
 260     def remove_default_sliver_attribute(self, name, value, network=None):
 261         if network:
 262             defaults = self.xml.xpath("//network[@name='%s']/sliver_defaults" % network)
 263         else:
 264             defaults = self.xml.xpath("//sliver_defaults" % network)
 265         self.remove_attribute(defaults, name, value)
 266
 267     def remove_sliver_attribute(self, hostname, name, value, network=None):
 268         node = self.get_node_element(hostname, network)
 269         sliver = node.find("sliver")
 270         self.remove_attribute(sliver, name, value)
 271
 272     def add_vlink(self, fromhost, tohost, kbps, network=None):
 273         fromnode = self.get_node_element(fromhost, network)
 274         tonode = self.get_node_element(tohost, network)
 275         links = self.get_link(fromnode, tonode, network)
 276
 277         for link in links:
 278             vlink = etree.SubElement(link, "vlink")
 279             fromid = fromnode.get("id")
 280             toid = tonode.get("id")
 281             vlink.set("endpoints", "%s %s" % (fromid, toid))
 282             self.add_attribute(vlink, "kbps", kbps)
 283
 284
 285     def remove_vlink(self, endpoints, network=None):
 286         vlinks = self.query_vlinks(endpoints, network)
 287         for vlink in vlinks:
 288             vlink.getparent().remove(vlink)
 289
 290
 291     def merge(self, in_rspec):
 292         """
 293         Merge contents for specified rspec with current rspec
 294         """
 295
 296         # just copy over all networks
 297         current_networks = self.get_networks()
 298         rspec = SfaRSpec(rspec=in_rspec)
 299         networks = rspec.get_network_elements()
 300         for network in networks:
 301             current_network = network.get('name')
 302             if not current_network in current_networks:
 303                 self.xml.append(network)
 304                 current_networks.append(current_network)
 305
 306
 307
 308 if __name__ == '__main__':
 309     rspec = SfaRSpec()
 310     nodes = [
 311     {'network': 'plc',
 312      'hostname': 'node1.planet-lab.org',
 313      'site_urn': 'urn:publicid:IDN+plc+authority+cm',
 314       'node_id': 1,
 315     },
 316     {'network': 'plc',
 317      'hostname': 'node2.planet-lab.org',
 318      'site_urn': 'urn:publicid:IDN+plc+authority+cm',
 319       'node_id': 1,
 320     },
 321     {'network': 'ple',
 322      'hostname': 'node1.planet-lab.eu',
 323      'site_urn': 'urn:publicid:IDN+plc+authority+cm',
 324       'node_id': 1,
 325     },
 326     ]
 327     rspec.add_nodes(nodes)
 328     print rspec