Add an option to disable cloud watch lite

This also adds a deprecation warning.
This also changes the default to use Ceilometer.

Release message:
Anyone deploying Heat should not be using OS::Heat::CWLiteAlarm, but
OS::Ceilometer::Alarm.
CWLiteAlarm should be explictly disabled in /etc/heat/heat.conf by
setting "enable_cloud_watch_lite=false". This will stop Heat from
running a period task check for alarms.

DocImpact
Change-Id: I2a10c14772bdafc001e211d7e94502ac1f6b32b1
Closes-bug: #1322128

bin/heat-engine

@@ -55,7 +55,8 @@ if __name__ == '__main__':
 
     srv = engine.EngineService(cfg.CONF.host, rpc_api.ENGINE_TOPIC)
     launcher = service.launch(srv, workers=cfg.CONF.num_engine_workers)
-    # We create the periodic tasks here, which mean they are created
-    # only in the parent process when num_engine_workers>1 is specified
-    srv.create_periodic_tasks()
+    if cfg.CONF.enable_cloud_watch_lite:
+        # We create the periodic tasks here, which mean they are created
+        # only in the parent process when num_engine_workers>1 is specified
+        srv.create_periodic_tasks()
     launcher.wait()

etc/heat/environment.d/default.yaml

@@ -3,7 +3,7 @@ resource_registry:
     # allow older templates with Quantum in them.
     "OS::Quantum*": "OS::Neutron*"
     # Choose your implementation of AWS::CloudWatch::Alarm
-    #"AWS::CloudWatch::Alarm": "file:///etc/heat/templates/AWS_CloudWatch_Alarm.yaml"
-    "AWS::CloudWatch::Alarm": "OS::Heat::CWLiteAlarm"
+    "AWS::CloudWatch::Alarm": "file:///etc/heat/templates/AWS_CloudWatch_Alarm.yaml"
+    #"AWS::CloudWatch::Alarm": "OS::Heat::CWLiteAlarm"
     "OS::Metering::Alarm": "OS::Ceilometer::Alarm"
     "AWS::RDS::DBInstance": "file:///etc/heat/templates/AWS_RDS_DBInstance.yaml"

etc/heat/heat.conf.sample

@@ -70,6 +70,10 @@
 # stack locking. (integer value)
 #engine_life_check_timeout=2
 
+# Enable the legacy OS::Heat::CWLiteAlarm resource. (boolean
+# value)
+#enable_cloud_watch_lite=true
+
 # Deprecated. (string value)
 #onready=<None>
 

heat/common/config.py

@@ -137,6 +137,9 @@ engine_opts = [
                default=2,
                help=_('RPC timeout for the engine liveness check that is used'
                       ' for stack locking.')),
+    cfg.BoolOpt('enable_cloud_watch_lite',
+                default=True,
+                help=_('Enable the legacy OS::Heat::CWLiteAlarm resource.')),
     cfg.StrOpt('onready',
                help=_('Deprecated.'))]
 

heat/engine/environment.py

@@ -15,6 +15,7 @@ import copy
 import glob
 import itertools
 import os.path
+import warnings
 
 from oslo.config import cfg
 import six
@@ -22,6 +23,7 @@ import six
 from heat.common import environment_format as env_fmt
 from heat.common import exception
 from heat.common.i18n import _
+from heat.engine import support
 from heat.openstack.common import log
 
 
@@ -215,6 +217,11 @@ class ResourceRegistry(object):
             LOG.info(_('Registering %(path)s -> %(value)s') % {
                 'path': descriptive_path,
                 'value': str(info.value)})
+
+        if isinstance(info, ClassResourceInfo):
+            if info.value.support_status.status != support.SUPPORTED:
+                warnings.warn(six.text_type(info.value.support_status.message))
+
         info.user_resource = (self.global_registry is not None)
         registry[name] = info
 

heat/engine/resources/cloud_watch.py

@@ -11,10 +11,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from oslo.config import cfg
+
 from heat.common import exception
 from heat.engine import constraints
 from heat.engine import properties
 from heat.engine import resource
+from heat.engine import support
 from heat.engine import watchrule
 
 
@@ -129,6 +132,11 @@ class CloudWatchAlarm(resource.Resource):
 
     strict_dependency = False
 
+    support_status = support.SupportStatus(
+        status=support.DEPRECATED,
+        message=_('OS::Heat::CWLiteAlarm is deprecated, '
+                  'use OS::Ceilometer::Alarm instead.'))
+
     def handle_create(self):
         wr = watchrule.WatchRule(context=self.context,
                                  watch_name=self.physical_resource_name(),
@@ -176,6 +184,10 @@ class CloudWatchAlarm(resource.Resource):
 
 
 def resource_mapping():
-    return {
-        'OS::Heat::CWLiteAlarm': CloudWatchAlarm,
-    }
+    cfg.CONF.import_opt('enable_cloud_watch_lite', 'heat.common.config')
+    if cfg.CONF.enable_cloud_watch_lite:
+        return {
+            'OS::Heat::CWLiteAlarm': CloudWatchAlarm,
+        }
+    else:
+        return {}

heat/tests/common.py

@@ -97,6 +97,11 @@ class HeatTestCase(testscenarios.WithScenarios,
             if templ_path not in cur_path:
                 tri.template_name = cur_path.replace('/etc/heat/templates',
                                                      templ_path)
+
+        # use CWLiteAlarm for testing.
+        resources.global_env().registry.load(
+            {"AWS::CloudWatch::Alarm": "OS::Heat::CWLiteAlarm"})
+
         utils.setup_dummy_db()
         self.addCleanup(utils.reset_dummy_db)
 

heat/tests/test_engine_service.py

@@ -2142,7 +2142,8 @@ class StackServiceTest(HeatTestCase):
 
     def test_list_resource_types_deprecated(self):
         resources = self.eng.list_resource_types(self.ctx, "DEPRECATED")
-        self.assertEqual(['OS::Neutron::RouterGateway'], resources)
+        self.assertEqual(['OS::Neutron::RouterGateway',
+                          'OS::Heat::CWLiteAlarm'], resources)
 
     def test_list_resource_types_supported(self):
         resources = self.eng.list_resource_types(self.ctx, "SUPPORTED")

heat/tests/test_provider_template.py

@@ -30,6 +30,7 @@ from heat.engine import resource
 from heat.engine import resources
 from heat.engine.resources import template_resource
 from heat.engine import rsrc_defn
+from heat.engine import support
 from heat.tests.common import HeatTestCase
 from heat.tests import generic_resource as generic_rsrc
 from heat.tests import utils
@@ -108,6 +109,8 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
+
             attributes_schema = {"Foo": attributes.Schema("A test attribute")}
             properties_schema = {
                 "Foo": {"Type": "String"},
@@ -186,6 +189,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {}
             attributes_schema = {"Foo": attributes.Schema("A test attribute")}
 
@@ -214,6 +218,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {}
             attributes_schema = {"Foo": attributes.Schema("A test attribute")}
 
@@ -244,6 +249,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {"Foo":
                                  properties.Schema(properties.Schema.STRING,
                                                    required=True)}
@@ -275,6 +281,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {"Foo":
                                  properties.Schema(properties.Schema.STRING,
                                                    required=True)}
@@ -306,6 +313,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {}
             attributes_schema = {}
 
@@ -336,6 +344,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {"Foo":
                                  properties.Schema(properties.Schema.MAP)}
             attributes_schema = {}
@@ -371,6 +380,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {"Length":
                                  properties.Schema(properties.Schema.INTEGER)}
             attributes_schema = {}
@@ -402,6 +412,7 @@ class ProviderTemplateTest(HeatTestCase):
         files = {'test_resource.template': json.dumps(provider)}
 
         class DummyResource(object):
+            support_status = support.SupportStatus()
             properties_schema = {"Foo":
                                  properties.Schema(properties.Schema.BOOLEAN)}
             attributes_schema = {}