Move CooldownMixin into separate file

CooldownMixin is a class that can be shared between OS and AWS
auto-scaling implementations.  This patch moves it to a shared
subdirectory.

Implements: partial-blueprint reorg-asg-code
Change-Id: I40e470460e84944d317f5b1772fc562abf62896d

1 files changed, 44 insertions, 0 deletions

diff --git a/heat/scaling/cooldown.py b/heat/scaling/cooldown.py
new file mode 100644
index 000000000..54e84ccc2
--- /dev/null
+++ b/heat/scaling/cooldown.py
@@ -0,0 +1,44 @@
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from heat.openstack.common import timeutils
+
+
+class CooldownMixin(object):
+    '''
+    Utility class to encapsulate Cooldown related logic which is shared
+    between AutoScalingGroup and ScalingPolicy
+    '''
+    def _cooldown_inprogress(self):
+        inprogress = False
+        try:
+            # Negative values don't make sense, so they are clamped to zero
+            cooldown = max(0, self.properties[self.COOLDOWN])
+        except TypeError:
+            # If not specified, it will be None, same as cooldown == 0
+            cooldown = 0
+
+        metadata = self.metadata_get()
+        if metadata and cooldown != 0:
+            last_adjust = metadata.keys()[0]
+            if not timeutils.is_older_than(last_adjust, cooldown):
+                inprogress = True
+        return inprogress
+
+    def _cooldown_timestamp(self, reason):
+        # Save resource metadata with a timestamp and reason
+        # If we wanted to implement the AutoScaling API like AWS does,
+        # we could maintain event history here, but since we only need
+        # the latest event for cooldown, just store that for now
+        metadata = {timeutils.strtime(): reason}
+        self.metadata_set(metadata)