Adds Libvirt Handler

JIRA: N/A

Adds a handler which can control the libvirt hypervisor
on the remote host, in order to define the vm's and networks
that are needed for an OPNFV deployment.
Also adds the domain and network objects, which are simple abstractions
of virtual machines and networks.

Change-Id: Ia836e7b080b8bca220d5fdf6eb72b6c580cab4d1
Signed-off-by: Parker Berberian <pberberian@iol.unh.edu>

1 files changed, 103 insertions, 0 deletions

diff --git a/laas-fog/source/network.py b/laas-fog/source/network.py
new file mode 100644
index 0000000..234ba22
--- /dev/null
+++ b/laas-fog/source/network.py
@@ -0,0 +1,103 @@
+"""
+#############################################################################
+#Copyright 2017 Parker Berberian and others                                 #
+#                                                                           #
+#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.                                             #
+#############################################################################
+"""
+
+import sys
+import xml.dom
+import xml.dom.minidom
+import yaml
+
+
+class Network:
+    """
+    This class has a similar role as the Domain class.
+    This class will parse a config file and
+    write the xml definitions of those networks for libvirt.
+    """
+
+    def __init__(self, propertiesDict):
+        """
+        init. propertiesDict should be
+        one of the dictionaries returned by parseConfigFile
+        """
+        self.name = propertiesDict['name']
+        self.brName = propertiesDict['brName']
+        self.brAddr = propertiesDict['brAddr']
+        self.netmask = propertiesDict['netmask']
+        self.forward = propertiesDict['forward']
+        self.dhcp = propertiesDict['dhcp']
+        self.cidr = propertiesDict['cidr']
+
+    def toXML(self):
+        """
+        Takes the config of this network and writes a valid xml definition
+        for libvirt.
+        returns a string
+        """
+        definition = xml.dom.minidom.parseString("<network>\n</network>")
+        nameElem = definition.createElement('name')
+        nameElem.appendChild(definition.createTextNode(self.name))
+        definition.documentElement.appendChild(nameElem)
+
+        if self.forward['used']:
+            forwardElem = definition.createElement('forward')
+            forwardElem.setAttribute('mode', self.forward['type'])
+            definition.documentElement.appendChild(forwardElem)
+
+        bridgeElem = definition.createElement('bridge')
+        bridgeElem.setAttribute('name', self.brName)
+        bridgeElem.setAttribute('stp', 'on')
+        bridgeElem.setAttribute('delay', '5')
+        definition.documentElement.appendChild(bridgeElem)
+
+        ipElem = definition.createElement('ip')
+        ipElem.setAttribute('address', self.brAddr)
+        ipElem.setAttribute('netmask', self.netmask)
+        if self.dhcp['used']:
+            dhcpElem = definition.createElement('dhcp')
+            rangeElem = definition.createElement('range')
+            rangeElem.setAttribute('start', self.dhcp['rangeStart'])
+            rangeElem.setAttribute('end', self.dhcp['rangeEnd'])
+            dhcpElem.appendChild(rangeElem)
+            ipElem.appendChild(dhcpElem)
+
+        definition.documentElement.appendChild(ipElem)
+
+        self.xml = definition.toprettyxml()
+        return self.xml
+
+    def writeXML(self, filePath):
+        """
+        writes xml definition to given file
+        """
+        f = open(filePath, 'w')
+        f.write(self.toXML())
+        f.close()
+
+    @staticmethod
+    def parseConfigFile(path):
+        """
+        parses given config file
+        """
+        configFile = open(path, 'r')
+        try:
+            config = yaml.safe_load(configFile)
+        except Exception:
+            print "Bad network configuration file. exiting"
+            sys.exit(1)
+
+        return config