Add live VNC information to domain output

Sets in the node daemon, returns via the API, and shows in the CLI,
information about the live VNC listen address and port for VNC-enabled
VMs.

Closes #115

node-daemon/pvcnoded/VMInstance.py

@@ -27,6 +27,8 @@ import json
 
 from threading import Thread
 
+from xml.etree import ElementTree
+
 import pvcnoded.zkhandler as zkhandler
 import pvcnoded.common as common
 
@@ -208,6 +210,21 @@ class VMInstance(object):
             except Exception as e:
                 self.logger.out('Error removing domain from list: {}'.format(e), state='e')
 
+    # Update the VNC live data
+    def update_vnc(self):
+        if self.dom is not None:
+            live_xml = ElementTree.fromstring(self.dom.XMLDesc(0))
+            graphics = live_xml.find('./devices/graphics')
+            if graphics is not None:
+                self.logger.out('Updating VNC data', state='i', prefix='Domain {}'.format(self.domuuid))
+                port = graphics.get('port', '')
+                listen = graphics.get('listen', '')
+                zkhandler.writedata(self.zk_conn, {'/domains/{}/vnc'.format(self.domuuid): '{}:{}'.format(listen, port)})
+            else:
+                zkhandler.writedata(self.zk_conn, {'/domains/{}/vnc'.format(self.domuuid): ''})
+        else:
+            zkhandler.writedata(self.zk_conn, {'/domains/{}/vnc'.format(self.domuuid): ''})
+
     # Start up the VM
     def start_vm(self):
         # Start the log watcher
@@ -739,7 +756,8 @@ class VMInstance(object):
                         self.removeDomainFromList()
                         # Stop the log watcher
                         self.console_log_instance.stop()
-
+                # Update the VNC information
+                self.update_vnc()
             else:
                 # Conditional pass three - Is this VM currently running on this node
                 if running == libvirt.VIR_DOMAIN_RUNNING: