Enumerate the meter type in the API Meter class

This uses the counter definitions as this is how the db
is populated and thus will be consistent.

Change-Id: I145600822cb89e65dd515e5d2075f1c44cc0b087

ceilometer/api/controllers/v2.py

@@ -40,9 +40,9 @@ from wsme import types as wtypes
 
 from ceilometer.openstack.common import log
 from ceilometer.openstack.common import timeutils
+from ceilometer import counter
 from ceilometer import storage
 
-
 LOG = log.getLogger(__name__)
 
 
@@ -421,8 +421,9 @@ class Meter(_Base):
     name = wtypes.text
     "The unique name for the meter"
 
-    # FIXME(dhellmann): Make this an enum?
-    type = wtypes.text
+    type = wtypes.Enum(str, counter.TYPE_GAUGE,
+                       counter.TYPE_CUMULATIVE,
+                       counter.TYPE_DELTA)
     "The meter type (see :ref:`measurements`)"
 
     unit = wtypes.text

tests/test_pipeline.py

@@ -97,7 +97,7 @@ class TestPipeline(base.TestCase):
 
         self.test_counter = counter.Counter(
             name='a',
-            type='test_type',
+            type=counter.TYPE_GAUGE,
             volume=1,
             unit='B',
             user_id="test_user",