Add a CloudWatch::Alarm implementation based on Ceilometer

It's off by default for the moment so the current cloudwatch tests can run.

Change-Id: Ibdce9c9223969bdcb8f2368e98dc6ab1241b84df

etc/heat/environment.d/default.yaml

@@ -1,3 +1,5 @@
 
 resource_registry:
+    # Choose your implementation of AWS::CloudWatch::Alarm
+    #"AWS::CloudWatch::Alarm": "file:///etc/heat/templates/AWS_CloudWatch_Alarm.yaml"
     "AWS::CloudWatch::Alarm": "OS::Heat::CWLiteAlarm"

etc/heat/templates/AWS_CloudWatch_Alarm.yaml

@@ -0,0 +1,85 @@
+HeatTemplateFormatVersion: '2012-12-12'
+Description: AWS::CloudWatch::Alarm using Ceilometer.
+Parameters:
+  AlarmDescription:
+    Type: String
+    Default: An alarm
+  EvaluationPeriods:
+    Type: String
+  MetricName:
+    Type: String
+  Namespace:
+    Type: String
+    Default: system/linux
+  Period:
+    Type: String
+  ComparisonOperator:
+    Type: String
+    AllowedValues: [GreaterThanOrEqualToThreshold, GreaterThanThreshold,
+                    LessThanThreshold, LessThanOrEqualToThreshold]
+  Statistic:
+    Type: String
+    AllowedValues: [SampleCount, Average, Sum, Minimum, Maximum]
+  Threshold:
+    Type: String
+  Units:
+    Type: String
+    AllowedValues: [Seconds, Microseconds, Milliseconds, Bytes, Kilobytes,
+                    Megabytes, Gigabytes, Terabytes, Bits, Kilobits, Megabits,
+                    Gigabits, Terabits, Percent, Count, Bytes/Second,
+                    Kilobytes/Second, Megabytes/Second, Gigabytes/Second,
+                    Terabytes/Second, Bits/Second, Kilobits/Second,
+                    Megabits/Second, Gigabits/Second, Terabits/Second,
+                    Count/Second, None]
+    Default: None
+  AlarmActions:
+   Type: CommaDelimitedList
+   Default: ''
+  OKActions:
+   Type: CommaDelimitedList
+   Default: ''
+  InsufficientDataActions:
+   Type: CommaDelimitedList
+   Default: ''
+  Dimensions:
+   Type: CommaDelimitedList
+
+Mappings:
+  ComparisonOperatorMap:
+    LessThanOrEqualToThreshold: {Ceilometer: le}
+    LessThanThreshold: {Ceilometer: lt}
+    GreaterThanThreshold: {Ceilometer: gt}
+    GreaterThanOrEqualToThreshold: {Ceilometer: ge}
+  StatisticMap:
+    SampleCount: {Ceilometer: count}
+    Average: {Ceilometer: avg}
+    Sum: {Ceilometer: sum}
+    Minimum: {Ceilometer: min}
+    Maximum: {Ceilometer: max}
+
+Resources:
+  __alarm__:
+    Type: OS::Metering::Alarm
+    Properties:
+      description:
+        Ref: AlarmDescription
+      counter_name:
+        Ref: MetricName
+      period:
+        Ref: Period
+      evaluation_periods:
+        Ref: EvaluationPeriods
+      threshold:
+        Ref: Threshold
+      alarm_actions:
+        "Fn::Split": [",", {Ref: AlarmActions}]
+      ok_actions:
+        "Fn::Split": [",", {Ref: OKActions}]
+      insufficient_data_actions:
+        "Fn::Split": [",", {Ref: InsufficientDataActions}]
+      statistic:
+        "Fn::FindInMap": [StatisticMap, {Ref: Statistic}, Ceilometer]
+      comparison_operator:
+        "Fn::FindInMap": [ComparisonOperatorMap, {Ref: ComparisonOperator}, Ceilometer]
+      matching_metadata:
+        "Fn::MemberListToMap": [Name, Value, {"Fn::Split": [",", {Ref: Dimensions}]}]