Pass context to notification drivers when we can.

Note that previously several notification drivers
created an admin context and embedded it in their
messages.  Those drivers now use the passed-in
context instead if it's available.

For blueprint novaplugins.

Change-Id: Icb89030256022d0a68db4a147611fd37fe83316a

16 files changed, 124 insertions, 44 deletions

diff --git a/nova/compute/utils.py b/nova/compute/utils.py
index 9cf890487..2415abf7c 100644
--- a/nova/compute/utils.py
+++ b/nova/compute/utils.py
@@ -239,6 +239,6 @@ def notify_about_instance_usage(context, instance, event_suffix,
     usage_info = _usage_from_instance(
             context, instance, network_info=network_info, **extra_usage_info)
 
-    notifier_api.notify('compute.%s' % host,
+    notifier_api.notify(context, 'compute.%s' % host,
                         'compute.instance.%s' % event_suffix,
                         notifier_api.INFO, usage_info)
diff --git a/nova/exception.py b/nova/exception.py
index e40fa0ccf..dc1199be3 100644
--- a/nova/exception.py
+++ b/nova/exception.py
@@ -25,6 +25,7 @@ SHOULD include dedicated exception logging.
 """
 
 import functools
+import inspect
 import sys
 
 import webob.exc
@@ -133,8 +134,12 @@ def wrap_exception(notifier=None, publisher_id=None, event_type=None,
                         # propagated.
                         temp_type = f.__name__
 
-                    notifier.notify(publisher_id, temp_type, temp_level,
-                                    payload)
+                    context = get_context_from_function_and_args(f,
+                                                                 args,
+                                                                 kw)
+
+                    notifier.notify(context, publisher_id, temp_type,
+                                    temp_level, payload)
 
                 # re-raise original exception since it may have been clobbered
                 raise exc_info[0], exc_info[1], exc_info[2]
@@ -1060,3 +1065,22 @@ class InvalidInstanceIDMalformed(Invalid):
 
 class CouldNotFetchImage(NovaException):
     message = _("Could not fetch image %(image)s")
+
+
+def get_context_from_function_and_args(function, args, kwargs):
+    """Find an arg named 'context' and return the value.
+
+       This is useful in a couple of decorators where we don't
+       know much about the function we're wrapping.
+    """
+    context = None
+    if 'context' in kwargs.keys():
+        context = kwargs['context']
+    else:
+        (iargs, _iva, _ikw, _idf) = inspect.getargspec(function)
+        if 'context' in iargs:
+            index = iargs.index('context')
+            if len(args) > index:
+                context = args[index]
+
+    return context
diff --git a/nova/log.py b/nova/log.py
index acd3ba56e..268f12f33 100644
--- a/nova/log.py
+++ b/nova/log.py
@@ -283,8 +283,10 @@ class PublishErrorsHandler(logging.Handler):
         if 'list_notifier_drivers' in FLAGS:
             if 'nova.notifier.log_notifier' in FLAGS.list_notifier_drivers:
                 return
-        nova.notifier.api.notify('nova.error.publisher', 'error_notification',
-            nova.notifier.api.ERROR, dict(error=record.msg))
+        nova.notifier.api.notify(None, 'nova.error.publisher',
+                                 'error_notification',
+                                 nova.notifier.api.ERROR,
+                                 dict(error=record.msg))
 
 
 def handle_exception(type, value, tb):
diff --git a/nova/notifier/api.py b/nova/notifier/api.py
index 4eff31bc4..b3bfbf9c4 100644
--- a/nova/notifier/api.py
+++ b/nova/notifier/api.py
@@ -13,13 +13,15 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import inspect
 import uuid
 
+from nova import exception
 from nova import flags
-from nova import utils
 from nova import log as logging
 from nova.openstack.common import cfg
 from nova.openstack.common import importutils
+from nova import utils
 
 
 LOG = logging.getLogger(__name__)
@@ -65,10 +67,13 @@ def notify_decorator(name, fn):
             body['args'].append(arg)
         for key in kwarg:
             body['kwarg'][key] = kwarg[key]
-        notify(FLAGS.default_publisher_id,
-                            name,
-                            FLAGS.default_notification_level,
-                            body)
+
+        context = exception.get_context_from_function_and_args(fn, args, kwarg)
+        notify(context,
+               FLAGS.default_publisher_id,
+               name,
+               FLAGS.default_notification_level,
+               body)
         return fn(*args, **kwarg)
     return wrapped_func
 
@@ -79,7 +84,7 @@ def publisher_id(service, host=None):
     return "%s.%s" % (service, host)
 
 
-def notify(publisher_id, event_type, priority, payload):
+def notify(context, publisher_id, event_type, priority, payload):
     """Sends a notification using the specified driver
 
     :param publisher_id: the source worker_type.host of the message
@@ -126,7 +131,7 @@ def notify(publisher_id, event_type, priority, payload):
                    payload=payload,
                    timestamp=str(utils.utcnow()))
     try:
-        driver.notify(msg)
+        driver.notify(context, msg)
     except Exception, e:
         LOG.exception(_("Problem '%(e)s' attempting to "
                         "send to notification system. Payload=%(payload)s") %
diff --git a/nova/notifier/capacity_notifier.py b/nova/notifier/capacity_notifier.py
index 848e591d5..b8e3a88e2 100644
--- a/nova/notifier/capacity_notifier.py
+++ b/nova/notifier/capacity_notifier.py
@@ -21,7 +21,7 @@ from nova import log as logging
 LOG = logging.getLogger(__name__)
 
 
-def notify(message):
+def notify(_context, message):
     """Look for specific compute manager events and interprete them
     so as to keep the Capacity table up to date.
 
diff --git a/nova/notifier/list_notifier.py b/nova/notifier/list_notifier.py
index 9f6d29775..4e73bdd50 100644
--- a/nova/notifier/list_notifier.py
+++ b/nova/notifier/list_notifier.py
@@ -37,7 +37,7 @@ class ImportFailureNotifier(object):
     def __init__(self, exception):
         self.exception = exception
 
-    def notify(self, message):
+    def notify(self, context, message):
         raise self.exception
 
 
@@ -54,11 +54,11 @@ def _get_drivers():
     return drivers
 
 
-def notify(message):
+def notify(context, message):
     """Passes notification to multiple notifiers in a list."""
     for driver in _get_drivers():
         try:
-            driver.notify(message)
+            driver.notify(context, message)
         except Exception as e:
             LOG.exception(_("Problem '%(e)s' attempting to send to "
                             "notification driver %(driver)s."), locals())
diff --git a/nova/notifier/log_notifier.py b/nova/notifier/log_notifier.py
index 25dfc693b..f13b9813f 100644
--- a/nova/notifier/log_notifier.py
+++ b/nova/notifier/log_notifier.py
@@ -22,7 +22,7 @@ from nova import log as logging
 FLAGS = flags.FLAGS
 
 
-def notify(message):
+def notify(_context, message):
     """Notifies the recipient of the desired event given the model.
     Log notifications using nova's default logging system"""
 
diff --git a/nova/notifier/no_op_notifier.py b/nova/notifier/no_op_notifier.py
index 029710505..ee1ddbdca 100644
--- a/nova/notifier/no_op_notifier.py
+++ b/nova/notifier/no_op_notifier.py
@@ -14,6 +14,6 @@
 #    under the License.
 
 
-def notify(message):
+def notify(_context, message):
     """Notifies the recipient of the desired event given the model"""
     pass
diff --git a/nova/notifier/rabbit_notifier.py b/nova/notifier/rabbit_notifier.py
index 7543700f7..cf39ba9be 100644
--- a/nova/notifier/rabbit_notifier.py
+++ b/nova/notifier/rabbit_notifier.py
@@ -31,9 +31,10 @@ FLAGS = flags.FLAGS
 FLAGS.register_opt(notification_topic_opt)
 
 
-def notify(message):
+def notify(context, message):
     """Sends a notification to the RabbitMQ"""
-    context = nova.context.get_admin_context()
+    if not context:
+        context = nova.context.get_admin_context()
     priority = message.get('priority',
                            FLAGS.default_notification_level)
     priority = priority.lower()
diff --git a/nova/notifier/test_notifier.py b/nova/notifier/test_notifier.py
index 1fa7a66be..3dbaa2dbb 100644
--- a/nova/notifier/test_notifier.py
+++ b/nova/notifier/test_notifier.py
@@ -20,6 +20,6 @@ FLAGS = flags.FLAGS
 NOTIFICATIONS = []
 
 
-def notify(message):
+def notify(_context, message):
     """Test notifier, stores notifications in memory for unittests."""
     NOTIFICATIONS.append(message)
diff --git a/nova/scheduler/filter_scheduler.py b/nova/scheduler/filter_scheduler.py
index 1e7ee16b9..766f2c369 100644
--- a/nova/scheduler/filter_scheduler.py
+++ b/nova/scheduler/filter_scheduler.py
@@ -65,7 +65,7 @@ class FilterScheduler(driver.Scheduler):
                 locals())
 
         payload = dict(request_spec=request_spec)
-        notifier.notify(notifier.publisher_id("scheduler"),
+        notifier.notify(context, notifier.publisher_id("scheduler"),
                         'scheduler.run_instance.start', notifier.INFO, payload)
 
         weighted_hosts = self._schedule(context, "compute", request_spec,
@@ -91,7 +91,7 @@ class FilterScheduler(driver.Scheduler):
             if instance:
                 instances.append(instance)
 
-        notifier.notify(notifier.publisher_id("scheduler"),
+        notifier.notify(context, notifier.publisher_id("scheduler"),
                         'scheduler.run_instance.end', notifier.INFO, payload)
 
         return instances
@@ -125,7 +125,7 @@ class FilterScheduler(driver.Scheduler):
         payload = dict(request_spec=request_spec,
                        weighted_host=weighted_host.to_dict(),
                        instance_id=instance['uuid'])
-        notifier.notify(notifier.publisher_id("scheduler"),
+        notifier.notify(context, notifier.publisher_id("scheduler"),
                         'scheduler.run_instance.scheduled', notifier.INFO,
                         payload)
 
diff --git a/nova/scheduler/manager.py b/nova/scheduler/manager.py
index 959c91583..2823abab3 100644
--- a/nova/scheduler/manager.py
+++ b/nova/scheduler/manager.py
@@ -168,7 +168,7 @@ class SchedulerManager(manager.Manager):
                        method=method,
                        reason=ex)
 
-        notifier.notify(notifier.publisher_id("scheduler"),
+        notifier.notify(context, notifier.publisher_id("scheduler"),
                         'scheduler.' + method, notifier.ERROR, payload)
 
     # NOTE (masumotok) : This method should be moved to nova.api.ec2.admin.
diff --git a/nova/tests/notifier/test_capacity_notifier.py b/nova/tests/notifier/test_capacity_notifier.py
index a34c0ed37..e41c52700 100644
--- a/nova/tests/notifier/test_capacity_notifier.py
+++ b/nova/tests/notifier/test_capacity_notifier.py
@@ -34,16 +34,16 @@ class CapacityNotifierTestCase(test.TestCase):
     def test_event_type(self):
         msg = self._make_msg("myhost", "mymethod")
         msg['event_type'] = 'random'
-        self.assertFalse(cn.notify(msg))
+        self.assertFalse(cn.notify(None, msg))
 
     def test_bad_event_suffix(self):
         msg = self._make_msg("myhost", "mymethod.badsuffix")
-        self.assertFalse(cn.notify(msg))
+        self.assertFalse(cn.notify(None, msg))
 
     def test_bad_publisher_id(self):
         msg = self._make_msg("myhost", "mymethod.start")
         msg['publisher_id'] = 'badpublisher'
-        self.assertFalse(cn.notify(msg))
+        self.assertFalse(cn.notify(None, msg))
 
     def test_update_called(self):
         def _verify_called(host, context, free_ram_mb_delta,
@@ -56,4 +56,4 @@ class CapacityNotifierTestCase(test.TestCase):
         self.stubs.Set(nova.db.api, "compute_node_utilization_update",
                        _verify_called)
         msg = self._make_msg("myhost", "delete.end")
-        self.assertTrue(cn.notify(msg))
+        self.assertTrue(cn.notify(None, msg))
diff --git a/nova/tests/notifier/test_list_notifier.py b/nova/tests/notifier/test_list_notifier.py
index e5ba48b6f..b647f501b 100644
--- a/nova/tests/notifier/test_list_notifier.py
+++ b/nova/tests/notifier/test_list_notifier.py
@@ -58,7 +58,7 @@ class NotifierListTestCase(test.TestCase):
         self.flags(notification_driver='nova.notifier.list_notifier',
                    list_notifier_drivers=['nova.notifier.no_op_notifier',
                                           'nova.notifier.no_op_notifier'])
-        nova.notifier.api.notify('publisher_id', 'event_type',
+        nova.notifier.api.notify('contextarg', 'publisher_id', 'event_type',
                 nova.notifier.api.WARN, dict(a=3))
         self.assertEqual(self.notify_count, 2)
         self.assertEqual(self.exception_count, 0)
@@ -68,7 +68,7 @@ class NotifierListTestCase(test.TestCase):
         self.flags(notification_driver='nova.notifier.list_notifier',
                    list_notifier_drivers=['nova.notifier.no_op_notifier',
                                           'nova.notifier.log_notifier'])
-        nova.notifier.api.notify('publisher_id',
+        nova.notifier.api.notify('contextarg', 'publisher_id',
                 'event_type', nova.notifier.api.WARN, dict(a=3))
         self.assertEqual(self.notify_count, 1)
         self.assertEqual(self.exception_count, 1)
@@ -78,7 +78,7 @@ class NotifierListTestCase(test.TestCase):
                    list_notifier_drivers=['nova.notifier.no_op_notifier',
                                           'nova.notifier.logo_notifier',
                                           'fdsjgsdfhjkhgsfkj'])
-        nova.notifier.api.notify('publisher_id',
+        nova.notifier.api.notify('contextarg', 'publisher_id',
                 'event_type', nova.notifier.api.WARN, dict(a=3))
         self.assertEqual(self.exception_count, 2)
         self.assertEqual(self.notify_count, 1)
diff --git a/nova/tests/test_exception.py b/nova/tests/test_exception.py
index acf1c6d69..34f4f1829 100644
--- a/nova/tests/test_exception.py
+++ b/nova/tests/test_exception.py
@@ -44,11 +44,12 @@ class FakeNotifier(object):
         self.provided_priority = None
         self.provided_payload = None
 
-    def notify(self, publisher, event, priority, payload):
+    def notify(self, context, publisher, event, priority, payload):
         self.provided_publisher = publisher
         self.provided_event = event
         self.provided_priority = priority
         self.provided_payload = payload
+        self.provided_context = context
 
 
 def good_function():
@@ -59,7 +60,7 @@ def bad_function_error():
     raise exception.Error()
 
 
-def bad_function_exception():
+def bad_function_exception(blah="a", boo="b", context=None):
     raise test.TestingException()
 
 
@@ -82,10 +83,11 @@ class WrapExceptionTestCase(test.TestCase):
         wrapped = exception.wrap_exception(notifier, "publisher", "event",
                                            "level")
         self.assertRaises(test.TestingException,
-                          wrapped(bad_function_exception))
+                          wrapped(bad_function_exception), context="context")
         self.assertEquals(notifier.provided_publisher, "publisher")
         self.assertEquals(notifier.provided_event, "event")
         self.assertEquals(notifier.provided_priority, "level")
+        self.assertEquals(notifier.provided_context, "context")
         for key in ['exception', 'args']:
             self.assertTrue(key in notifier.provided_payload.keys())
 
diff --git a/nova/tests/test_notifier.py b/nova/tests/test_notifier.py
index ff51f6ba2..c0d49163c 100644
--- a/nova/tests/test_notifier.py
+++ b/nova/tests/test_notifier.py
@@ -36,15 +36,15 @@ class NotifierTestCase(test.TestCase):
         self.stubs.Set(nova.notifier.no_op_notifier, 'notify',
                 mock_notify)
 
-        notifier_api.notify('publisher_id', 'event_type',
-                nova.notifier.api.WARN, dict(a=3))
+        notifier_api.notify('contextarg', 'publisher_id', 'event_type',
+                            nova.notifier.api.WARN, dict(a=3))
         self.assertEqual(self.notify_called, True)
 
     def test_verify_message_format(self):
         """A test to ensure changing the message format is prohibitively
         annoying"""
 
-        def message_assert(message):
+        def message_assert(context, message):
             fields = [('publisher_id', 'publisher_id'),
                       ('event_type', 'event_type'),
                       ('priority', 'WARN'),
@@ -53,11 +53,12 @@ class NotifierTestCase(test.TestCase):
                 self.assertEqual(message[k], v)
             self.assertTrue(len(message['message_id']) > 0)
             self.assertTrue(len(message['timestamp']) > 0)
+            self.assertEqual(context, 'contextarg')
 
         self.stubs.Set(nova.notifier.no_op_notifier, 'notify',
                 message_assert)
-        notifier_api.notify('publisher_id', 'event_type',
-                nova.notifier.api.WARN, dict(a=3))
+        notifier_api.notify('contextarg', 'publisher_id', 'event_type',
+                            nova.notifier.api.WARN, dict(a=3))
 
     def test_send_rabbit_notification(self):
         self.stubs.Set(nova.flags.FLAGS, 'notification_driver',
@@ -68,14 +69,14 @@ class NotifierTestCase(test.TestCase):
             self.mock_notify = True
 
         self.stubs.Set(nova.rpc, 'notify', mock_notify)
-        notifier_api.notify('publisher_id', 'event_type',
-                nova.notifier.api.WARN, dict(a=3))
+        notifier_api.notify('contextarg', 'publisher_id', 'event_type',
+                            nova.notifier.api.WARN, dict(a=3))
 
         self.assertEqual(self.mock_notify, True)
 
     def test_invalid_priority(self):
         self.assertRaises(nova.notifier.api.BadPriorityException,
-                notifier_api.notify, 'publisher_id',
+                notifier_api.notify, 'contextarg', 'publisher_id',
                 'event_type', 'not a priority', dict(a=3))
 
     def test_rabbit_priority_queue(self):
@@ -91,7 +92,8 @@ class NotifierTestCase(test.TestCase):
             self.test_topic = topic
 
         self.stubs.Set(nova.rpc, 'notify', mock_notify)
-        notifier_api.notify('publisher_id', 'event_type', 'DEBUG', dict(a=3))
+        notifier_api.notify('contextarg', 'publisher_id',
+                            'event_type', 'DEBUG', dict(a=3))
         self.assertEqual(self.test_topic, 'testnotify.debug')
 
     def test_error_notification(self):
@@ -131,3 +133,47 @@ class NotifierTestCase(test.TestCase):
 
         self.assertEqual(3, example_api(1, 2))
         self.assertEqual(self.notify_called, True)
+
+    def test_decorator_context(self):
+        """Verify that the notify decorator can extract the 'context' arg."""
+        self.notify_called = False
+        self.context_arg = None
+
+        def example_api(arg1, arg2, context):
+            return arg1 + arg2
+
+        def example_api2(arg1, arg2, **kw):
+            return arg1 + arg2
+
+        example_api = nova.notifier.api.notify_decorator(
+                            'example_api',
+                             example_api)
+
+        example_api2 = nova.notifier.api.notify_decorator(
+                             'example_api2',
+                              example_api2)
+
+        def mock_notify(context, cls, _type, _priority, _payload):
+            self.notify_called = True
+            self.context_arg = context
+
+        self.stubs.Set(nova.notifier.api, 'notify',
+                mock_notify)
+
+        # Test positional context
+        self.assertEqual(3, example_api(1, 2, "contextname"))
+        self.assertEqual(self.notify_called, True)
+        self.assertEqual(self.context_arg, "contextname")
+
+        self.notify_called = False
+        self.context_arg = None
+
+        # Test named context
+        self.assertEqual(3, example_api2(1, 2, context="contextname2"))
+        self.assertEqual(self.notify_called, True)
+        self.assertEqual(self.context_arg, "contextname2")
+
+        # Test missing context
+        self.assertEqual(3, example_api2(1, 2, bananas="delicious"))
+        self.assertEqual(self.notify_called, True)
+        self.assertEqual(self.context_arg, None)