add: migration for xen

ccnode/libvirtwrapper.py

@@ -567,29 +567,41 @@ class LibvirtVm(VM):
             raise VMError('deletion of VM `%s` failed' % self.get_name())
         self._hv_handle._cache_vm_rebuild()
     
-    def migrate(self, host, port):
+    def migrate(self, libvirt_addr, hv_addr):
         '''
         '''
+        # special case for xen
         if self.hypervisor().get_hv_type() == 'xen':
             flags = (libvirt.VIR_MIGRATE_LIVE ^
                     libvirt.VIR_MIGRATE_PERSIST_DEST ^
                     libvirt.VIR_MIGRATE_UNDEFINE_SOURCE)
-            uri = 'xenmigr://%s:%d' % (host, port)
+            lv_uri  = 'xen+tcp://%s:%d' % libvirt_addr
+            mig_uri = 'xenmigr://%s:%d' % hv_addr
+        # kvm and others
         else:
             flags = (libvirt.VIR_MIGRATE_LIVE ^
                     libvirt.VIR_MIGRATE_PERSIST_DEST ^
                     libvirt.VIR_MIGRATE_UNDEFINE_SOURCE ^
                     libvirt.VIR_MIGRATE_PEER2PEER ^
                     libvirt.VIR_MIGRATE_TUNNELLED)
-            uri = 'qemu+tcp://%s:%d/system' % (host, port)
+            lv_uri  = 'qemu+tcp://%s:%d/system' % libvirt_addr
+            mig_uri = 'qemu+tcp://%s:%d/system' % hv_addr
         
+        # establish the connection with remote libvirt
+        rconn = libvirt.open(lv_uri)
+        
+        # migrate !
         try:
-            self._domain.migrate(self._hv_handle._lvcon_handle, flags, None, uri, 0)
+            self._domain.migrate(rconn, flags, None, mig_uri, 0)
         except libvirt.libvirtError as err:
             # FIXME ignore bogus exception properly
+            # maybe no more needed since real remote connection is provided
             if not ('no domain with matching name' in err.message
-                                    or 'Domain not found' in err.message):
+                    or 'Domain not found' in err.message):
                 raise err
+        finally:
+            # close the libvirt connection
+            rconn.close()
     
     def power_on(self):
         '''