+from __future__ import with_statement
import re
import socket
+from sfa.util.faults import *
from sfa.rspecs.aggregates.vini.topology import *
+from xmlbuilder import XMLBuilder
+from lxml import etree
+import sys
+from StringIO import StringIO
+
+VINI_RELAXNG_SCHEMA = "/var/www/html/schemas/vini.rng"
# Taken from bwlimit.py
#
class Node:
def __init__(self, node, bps = 1000 * 1000000):
self.id = node['node_id']
+ self.idtag = "n%s" % self.id
self.hostname = node['hostname']
- self.shortname = self.hostname.replace('.vini-veritas.net', '')
+ self.name = self.shortname = self.hostname.replace('.vini-veritas.net', '')
self.site_id = node['site_id']
self.ipaddr = socket.gethostbyname(self.hostname)
self.bps = bps
self.links = set()
+ self.sliver = False
def get_link_id(self, remote):
if self.id < remote.id:
if len(sl):
return sl.pop()
return None
+
+ def add_sliver(self):
+ self.sliver = True
+
+ def toxml(self, xml, hrn):
+ if not self.tag:
+ return
+ with xml.node(id = self.idtag):
+ with xml.hostname:
+ xml << self.hostname
+ with xml.kbps:
+ xml << str(int(self.bps/1000))
+ if self.sliver:
+ with xml.sliver:
+ pass
class Link:
- def __init__(self, end1, end2, bps = 1000 * 1000000):
+ def __init__(self, end1, end2, bps = 1000 * 1000000, parent = None):
self.end1 = end1
self.end2 = end2
self.bps = bps
-
+ self.parent = parent
+ self.children = []
+
end1.add_link(self)
end2.add_link(self)
+ if self.parent:
+ self.parent.children.append(self)
+
+ def toxml(self, xml):
+ end_ids = "%s %s" % (self.end1.idtag, self.end2.idtag)
+
+ if self.parent:
+ element = xml.vlink(endpoints=end_ids)
+ else:
+ element = xml.link(endpoints=end_ids)
+
+ with element:
+ with xml.description:
+ xml << "%s -- %s" % (self.end1.name, self.end2.name)
+ with xml.kbps:
+ xml << str(int(self.bps/1000))
+ for child in self.children:
+ child.toxml(xml)
+
class Site:
def __init__(self, site):
self.id = site['site_id']
+ self.idtag = "s%s" % self.id
self.node_ids = site['node_ids']
- self.name = site['abbreviated_name']
+ self.name = site['abbreviated_name'].replace(" ", "_")
self.tag = site['login_base']
self.public = site['is_public']
+ self.enabled = site['enabled']
self.links = set()
def get_sitenodes(self, nodes):
def add_link(self, link):
self.links.add(link)
-
+
+ def toxml(self, xml, hrn, nodes):
+ if not (self.public and self.enabled and self.node_ids):
+ return
+ with xml.site(id = self.idtag):
+ with xml.name:
+ xml << self.name
+
+ for node in self.get_sitenodes(nodes):
+ node.toxml(xml, hrn)
+
class Slice:
def __init__(self, slice):
pass
+ """ Lookup site based on id or idtag value """
def lookupSite(self, id):
val = None
+ if isinstance(id, basestring):
+ id = int(id.lstrip('s'))
try:
val = self.sites[id]
except:
sites.append(self.sites[s])
return sites
+ """ Lookup node based on id or idtag value """
def lookupNode(self, id):
val = None
+ if isinstance(id, basestring):
+ id = int(id.lstrip('n'))
try:
val = self.nodes[id]
except:
def nodesInTopo(self):
nodes = []
for n in self.nodes:
- if self.nodes[n].links:
- nodes.append(self.nodes[n])
+ node = self.nodes[n]
+ if node.sliver:
+ nodes.append(node)
return nodes
def lookupSliceTag(self, id):
tags.append(self.tags[t])
return tags
- def nodeTopoFromRspec(self, rspec):
+ def lookupSiteLink(self, node1, node2):
+ site1 = self.sites[node1.site_id]
+ site2 = self.sites[node2.site_id]
+ for link in self.sitelinks:
+ if site1 == link.end1 and site2 == link.end2:
+ return link
+ if site2 == link.end1 and site1 == link.end2:
+ return link
+ return None
+
+
+ def __add_vlink(self, vlink, slicenodes, parent = None):
+ n1 = n2 = None
+ endpoints = vlink.get("endpoints")
+ if endpoints:
+ (end1, end2) = endpoints.split()
+ n1 = self.lookupNode(end1)
+ n2 = self.lookupNode(end2)
+ elif parent:
+ """ Try to infer the endpoints for the virtual link """
+ site_endpoints = parent.get("endpoints")
+ (n1, n2) = self.__infer_endpoints(site_endpoints, slicenodes)
+ else:
+ raise Error("no endpoints given")
+
+ #print "Added virtual link: %s -- %s" % (n1.tag, n2.tag)
+ bps = int(vlink.findtext("kbps")) * 1000
+ sitelink = self.lookupSiteLink(n1, n2)
+ if not sitelink:
+ raise PermissionError("nodes %s and %s not adjacent" %
+ (n1.idtag, n2.idtag))
+ self.nodelinks.append(Link(n1, n2, bps, sitelink))
+ return
+
+ """
+ Infer the endpoints of the virtual link. If the slice exists on
+ only a single node at each end of the physical link, we'll assume that
+ the user wants the virtual link to terminate at these nodes.
+ """
+ def __infer_endpoints(self, endpoints, slicenodes):
+ n = []
+ ends = endpoints.split()
+ for end in ends:
+ found = 0
+ site = self.lookupSite(end)
+ for id in site.node_ids:
+ if id in slicenodes:
+ n.append(slicenodes[id])
+ found += 1
+ if found != 1:
+ raise Error("could not infer endpoint for site %s" % site.id)
+ #print "Inferred endpoints: %s %s" % (n[0].idtag, n[1].idtag)
+ return n
+
+ def nodeTopoFromRSpec(self, xml):
if self.nodelinks:
raise Error("virtual topology already present")
- rspecdict = rspec.toDict()
nodedict = {}
for node in self.getNodes():
- nodedict[node.tag] = node
+ nodedict[node.idtag] = node
- linkspecs = rspecdict['Rspec']['Request'][0]['NetSpec'][0]['LinkSpec']
- for l in linkspecs:
- n1 = nodedict[l['endpoint'][0]]
- n2 = nodedict[l['endpoint'][1]]
- bps = get_tc_rate(l['bw'][0])
- self.nodelinks.append(Link(n1, n2, bps))
-
+ slicenodes = {}
+
+ tree = etree.parse(StringIO(xml))
+
+ # Validate the incoming request against the RelaxNG schema
+ relaxng_doc = etree.parse(VINI_RELAXNG_SCHEMA)
+ relaxng = etree.RelaxNG(relaxng_doc)
+
+ if not relaxng(tree):
+ error = relaxng.error_log.last_error
+ message = "%s (line %s)" % (error.message, error.line)
+ raise InvalidRSpec(message)
+
+ rspec = tree.getroot()
+
+ """
+ Handle requests where the user has annotated a description of the
+ physical resources (nodes and links) with virtual ones (slivers
+ and vlinks).
+ """
+ # Find slivers under node elements
+ for sliver in rspec.iterfind("./network/site/node/sliver"):
+ elem = sliver.getparent()
+ node = nodedict[elem.get("id")]
+ slicenodes[node.id] = node
+ node.add_sliver()
+
+ # Find links under link elements
+ for vlink in rspec.iterfind("./network/link/vlink"):
+ link = vlink.getparent()
+ self.__add_vlink(vlink, slicenodes, link)
+
+ """
+ Handle requests where the user has listed the virtual resources only
+ """
+ # Find slivers that specify nodeid
+ for sliver in rspec.iterfind("./request/sliver[@nodeid]"):
+ node = nodedict[sliver.get("nodeid")]
+ slicenodes[node.id] = node
+ node.add_sliver()
+
+ # Find vlinks that specify endpoints
+ for vlink in rspec.iterfind("./request/vlink[@endpoints]"):
+ self.__add_vlink(vlink, slicenodes)
+
+ return
+
def nodeTopoFromSliceTags(self, slice):
if self.nodelinks:
raise Error("virtual topology already present")
for node in slice.get_nodes(self.nodes):
+ node.sliver = True
linktag = slice.get_tag('topo_rspec', self.tags, node)
if linktag:
l = eval(linktag.value)
if node.id < id:
bps = get_tc_rate(bw)
remote = self.lookupNode(id)
- self.nodelinks.append(Link(node, remote, bps))
+ sitelink = self.lookupSiteLink(node, remote)
+ self.nodelinks.append(Link(node,remote,bps,sitelink))
def updateSliceTags(self, slice):
if not self.nodelinks:
if tag.tagname == 'topo_rspec' and not tag.updated:
tag.delete()
tag.write(self.api)
+
+ """
+ Check the requested topology against the available topology and capacity
+ """
+ def verifyNodeTopo(self, hrn, topo):
+ for link in self.nodelinks:
+ if link.bps <= 0:
+ raise GeniInvalidArgument(bw, "BW")
+
+ n1 = link.end1
+ n2 = link.end2
+ sitelink = self.lookupSiteLink(n1, n2)
+ if not sitelink:
+ raise PermissionError("%s: nodes %s and %s not adjacent" % (hrn, n1.tag, n2.tag))
+ if sitelink.bps < link.bps:
+ raise PermissionError("%s: insufficient capacity between %s and %s" % (hrn, n1.tag, n2.tag))
+
+ """
+ Produce XML directly from the topology specification.
+ """
+ def toxml(self, hrn = None):
+ xml = XMLBuilder(format = True, tab_step = " ")
+ with xml.RSpec(type="VINI"):
+ if hrn:
+ element = xml.network(name="Public_VINI", slice=hrn)
+ else:
+ element = xml.network(name="Public_VINI")
+
+ with element:
+ for site in self.getSites():
+ site.toxml(xml, hrn, self.nodes)
+ for link in self.sitelinks:
+ link.toxml(xml)
+ header = '<?xml version="1.0"?>\n'
+ return header + str(xml)
"""
Create a dictionary of site objects keyed by site ID
git://git.onelab.eu / sfa.git / blobdiff