API Microversioning

This patch set adds API microversion support along
with the first API microversion: start/end time for
CONTINUOUS audits.

APIImpact

Implements: blueprint api-microversioning
Depends-On: I6bb838d777b2c7aa799a70485980e5dc87838456
Change-Id: I17309d80b637f02bc5e6d33294472e02add88f86

watcher/api/controllers/v1/utils.py

@@ -23,6 +23,7 @@ import pecan
 import wsme
 
 from watcher._i18n import _
+from watcher.api.controllers.v1 import versions
 from watcher.common import utils
 from watcher import objects
 
@@ -155,3 +156,12 @@ def get_resource(resource, resource_id, eager=False):
         return _get(pecan.request.context, resource_id, eager=eager)
 
     return _get(pecan.request.context, resource_id)
+
+
+def allow_start_end_audit_time():
+    """Check if we should support optional start/end attributes for Audit.
+
+    Version 1.1 of the API added support for start and end time of continuous
+    audits.
+    """
+    return pecan.request.version.minor >= versions.MINOR_1_START_END_TIMING