From 1395d31badc43bdce036e8da3927af22a22ca91e Mon Sep 17 00:00:00 2001
From: Sandy Walsh <sandy.walsh@rackspace.com>
Date: Mon, 13 Dec 2010 18:25:17 -0800
Subject: Fixed power state update with Twisted callback

---
 nova/compute/manager.py   | 21 +++++++++++++++++----
 nova/virt/xenapi/vmops.py | 12 ++++++++----
 nova/virt/xenapi_conn.py  |  8 ++++----
 3 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/nova/compute/manager.py b/nova/compute/manager.py
index 61ed3136b..ae33fe5b9 100644
--- a/nova/compute/manager.py
+++ b/nova/compute/manager.py
@@ -194,6 +194,13 @@ class ComputeManager(manager.Manager):
         yield self.driver.unrescue(instance_ref)
         self._update_state(context, instance_id)
 
+    @staticmethod
+    def _update_state_callback(self, context, instance_id, result):
+        """Update instance state when Deferred task completes.
+        This staticmethod must be wrappered in a 
+        lambda to pass in self, context & instance_id."""
+        self._update_state(context, instance_id)
+
     @defer.inlineCallbacks
     @exception.wrap_exception
     def pause_instance(self, context, instance_id):
@@ -207,8 +214,11 @@ class ComputeManager(manager.Manager):
                                    instance_id,
                                    power_state.NOSTATE,
                                    'pausing')
-        yield self.driver.pause(instance_ref)
-        self._update_state(context, instance_id)
+        yield self.driver.pause(instance_ref, 
+            lambda result : self._update_state_callback(self, 
+                                                        context, 
+                                                        instance_id, 
+                                                        result))
 
     @defer.inlineCallbacks
     @exception.wrap_exception
@@ -223,8 +233,11 @@ class ComputeManager(manager.Manager):
                                    instance_id,
                                    power_state.NOSTATE,
                                    'unpausing')
-        yield self.driver.unpause(instance_ref)
-        self._update_state(context, instance_id)
+        yield self.driver.unpause(instance_ref,
+             lambda result : self._update_state_callback(self, 
+                                                        context, 
+                                                        instance_id, 
+                                                        result))
 
     @exception.wrap_exception
     def get_console_output(self, context, instance_id):
diff --git a/nova/virt/xenapi/vmops.py b/nova/virt/xenapi/vmops.py
index 353e83873..03ee3dd58 100644
--- a/nova/virt/xenapi/vmops.py
+++ b/nova/virt/xenapi/vmops.py
@@ -121,24 +121,28 @@ class VMOps(object):
             logging.warn(exc)
 
     @defer.inlineCallbacks
-    def pause(self, instance):
+    def pause(self, instance, callback):
         """ Pause VM instance """
         instance_name = instance.name
         vm = yield VMHelper.lookup(self._session, instance_name)
         if vm is None:
             raise Exception('instance not present %s' % instance_name)
         task = yield self._session.call_xenapi('Async.VM.pause', vm)
-        yield self._session.wait_for_task(task)
+        deferred = self._session.wait_for_task(task)
+        deferred.addCallback(callback)
+        yield deferred
 
     @defer.inlineCallbacks
-    def unpause(self, instance):
+    def unpause(self, instance, callback):
         """ Unpause VM instance """
         instance_name = instance.name
         vm = yield VMHelper.lookup(self._session, instance_name)
         if vm is None:
             raise Exception('instance not present %s' % instance_name)
         task = yield self._session.call_xenapi('Async.VM.unpause', vm)
-        yield self._session.wait_for_task(task)
+        deferred = self._session.wait_for_task(task)
+        deferred.addCallback(callback)
+        yield deferred
 
     def get_info(self, instance_id):
         """ Return data about VM instance """
diff --git a/nova/virt/xenapi_conn.py b/nova/virt/xenapi_conn.py
index df405e75f..bcfb48323 100644
--- a/nova/virt/xenapi_conn.py
+++ b/nova/virt/xenapi_conn.py
@@ -122,13 +122,13 @@ class XenAPIConnection(object):
         """ Destroy VM instance """
         self._vmops.destroy(instance)
 
-    def pause(self, instance):
+    def pause(self, instance, callback):
         """ Pause VM instance """
-        self._vmops.pause(instance)
+        self._vmops.pause(instance, callback)
 
-    def unpause(self, instance):
+    def unpause(self, instance, callback):
         """ Unpause paused VM instance """
-        self._vmops.unpause(instance)
+        self._vmops.unpause(instance, callback)
 
     def get_info(self, instance_id):
         """ Return data about VM instance """
-- 
cgit