More significant work

NodeInstance.py

@@ -3,17 +3,46 @@
 import os, socket, time, uuid, threading, libvirt, kazoo.client
 
 class NodeInstance(threading.Thread):
-    def __init__(self, name, zk):
+    def __init__(self, name, node_list, zk):
         super(NodeInstance, self).__init__()
         # Passed-in variables on creation
         self.zkey = '/nodes/%s' % name
         self.zk = zk
         self.name = name
         self.stop_thread = threading.Event()
+        self.node_list = node_list
+        self.domainlist = []
 
+    # Get value functions
+    def getfreemem():
+        return self.memfree
+
+    def getcpuload():
+        return self.cpuload
+
+    def getname():
+        return self.name
+
+    # Shutdown the thread
     def stop(self):
         self.stop_thread.set()
 
+    # Flush all VMs on the host
+    def flush(self):
+        for domain in self.domainlist:
+            # Determine the best target hypervisor
+            least_mem = (2^64)/8
+            least_load = 999.0
+            least_host = ""
+            for node in node_list:
+                node_freemem = node.getfreemem()
+                if node_freemem < least_mem:
+                    least_mem = node_freemem
+                    least_host = node.getname()
+
+            self.zk.set('/domains/' + domain + '/state', b'migrate')
+            self.zk.set('/domains/' + domain + '/hypervisor', least_host.encode('ascii'))
+
     def run(self):
         if self.name == socket.gethostname():
             self.setup_local_node()
@@ -42,10 +71,18 @@ class NodeInstance(threading.Thread):
             self.zk.set(self.zkey + '/memfree', str(self.memfree).encode('ascii'))
             self.zk.set(self.zkey + '/cpuload', str(self.cpuload).encode('ascii'))
             print("Free memory: %s | Load: %s" % ( self.memfree, self.cpuload ))
-            time.sleep(1)
-            if self.stop_thread.is_set():
-                break
+            print("Active domains: %s" % self.domainlist)
+            for x in range(0,50):
+                time.sleep(0.1)
+                if self.stop_thread.is_set():
+                    return
 
+        @zk.DataWatch(self.zkey + '/state')
+        def watch_state(data, stat):
+            self.state = data.decode('ascii')
+            print("Version: %s, data: %s" % (stat.version, self.state))
+            if self.state == 'flush':
+                self.flush()
 
     def setup_remote_node(self):
         @zk.DataWatch(self.zkey + '/state')
@@ -54,17 +91,17 @@ class NodeInstance(threading.Thread):
             print("Version: %s, data: %s" % (stat.version, self.state))
 
         @zk.DataWatch(self.zkey + '/cpucount')
-        def watch_state(data, stat):
+        def watch_cpucount(data, stat):
             self.cpucount = data.decode('ascii')
             print("Version: %s, data: %s" % (stat.version, self.cpucount))
 
         @zk.DataWatch(self.zkey + '/cpuload')
-        def watch_state(data, stat):
+        def watch_cpuload(data, stat):
             self.cpuload = data.decode('ascii')
             print("Version: %s, data: %s" % (stat.version, self.cpuload))
 
         @zk.DataWatch(self.zkey + '/memfree')
-        def watch_state(data, stat):
+        def watch_memfree(data, stat):
             self.memfree = data.decode('ascii')
             print("Version: %s, data: %s" % (stat.version, self.memfree))