Fix sg-core test scenario.

The scenario assumed, there is an image in glance, which may
not always be the case. This patch creates a new image based
on path configured in CONF.scenario.img_file. To add this
functionality the TestTelemetryIntegrationPrometheus class
was moved to inherit from tempest.scenario.manager.ScenarioTest.
Requirements on glance and ceilometer were added too. Ceilometer
was required even before this change, but the requirement check
was missing.

The scenario assumed the ceilometer pipeline interval is less
than 2 minutes. This patch adds a config option for this.
By default 300s is used, which is the default interval when
installing devstack. It's then changed to 15s in .zuul.yaml,
which is the interval used in our tests.

Change-Id: Ifae664540fc5a749b2965822267d7c54b34a77a5

.zuul.yaml

@@ -59,6 +59,7 @@
               metric_backends: gnocchi,prometheus
             telemetry:
               disable_ssl_certificate_validation: True
+              ceilometer_polling_interval: 15
       tempest_test_regex: telemetry_tempest_plugin
       tox_envlist: all
 

telemetry_tempest_plugin/config.py

@@ -83,7 +83,10 @@ TelemetryGroup = [
     cfg.StrOpt('sg_core_service_url',
                default="127.0.0.1:3000",
                help="URL to sg-core prometheus endpoint"),
-
+    cfg.IntOpt('ceilometer_polling_interval',
+               default=300,
+               help="Polling interval configured for ceilometer. This can "
+                    "be used in test cases to wait for metrics to appear.")
 ]
 
 telemetry_services_opts = [

telemetry_tempest_plugin/scenario/telemetry_integration_prometheus_gabbits/ceilometer-sg-core-integration.yaml

@@ -3,7 +3,7 @@ tests:
     desc: Check the sg-core prometheus endpoint for ceilometer metrics
     GET: $ENVIRON['SG_CORE_SERVICE_URL']/metrics
     poll:
-      count: 60
+      count: $ENVIRON['CEILOMETER_POLLING_INTERVAL']
       delay: 2
     response_strings:
       - "ceilometer_image_size"

telemetry_tempest_plugin/scenario/test_telemetry_integration_prometheus.py

@@ -13,7 +13,7 @@
 import os
 
 from tempest import config
-import tempest.test
+from tempest.scenario import manager
 
 from telemetry_tempest_plugin.scenario import utils
 
@@ -23,22 +23,27 @@ TEST_DIR = os.path.join(os.path.dirname(__file__),
                         'telemetry_integration_prometheus_gabbits')
 
 
-class PrometheusGabbiTest(tempest.test.BaseTestCase):
-    credentials = ['admin']
+class PrometheusGabbiTest(manager.ScenarioTest):
+    credentials = ['admin', 'primary']
 
     TIMEOUT_SCALING_FACTOR = 5
 
     @classmethod
     def skip_checks(cls):
         super(PrometheusGabbiTest, cls).skip_checks()
-        if not CONF.service_available.sg_core:
-            raise cls.skipException("sg-core support is required")
+        for name in ["sg_core", "glance", "ceilometer"]:
+            if not getattr(CONF.service_available, name, False):
+                raise cls.skipException("%s support is required" %
+                                        name.capitalize())
 
     def _prep_test(self, filename):
         os.environ.update({
             "SG_CORE_SERVICE_URL":
             str(config.CONF.telemetry.sg_core_service_url),
+            "CEILOMETER_POLLING_INTERVAL":
+            str(CONF.telemetry.ceilometer_polling_interval),
         })
+        self.image_create()
 
 
 utils.generate_tests(PrometheusGabbiTest, TEST_DIR)