Fixing issues with running cloudpulse

This fix addresses the following issues.
1.Throwing error when running an undefined test.
2.Show a 404 when doing cloudpulse show on a invalid test

Change-Id: Idd82cfdb43199bc223768000456ab3d26590edd0

cloudpulse/TestManager/TestManager.py

@@ -56,6 +56,8 @@ class Periodic_Task(object):
         task_interval = int(tasks[self.task])
         filters = {}
         filters['name'] = self.task
+        tests = objects.Cpulse.list(context, filters=filters)
+        if tests:
             lasttest = objects.Cpulse.list(context, filters=filters)[-1]
             lastime = lasttest['created_at']
             timenow = datetime.datetime.now(pytz.utc)
@@ -64,6 +66,8 @@ class Periodic_Task(object):
                 return True
             else:
                 return False
+        else:
+            return True
 
     def run_task(self):
         importutils.import_module('keystonemiddleware.auth_token')

cloudpulse/api/middleware/parsable_error.py

@@ -81,7 +81,7 @@ class ParsableErrorMiddleware(object):
             else:
                 body = [json.dumps({'error_message': '\n'.join(app_iter)})]
                 state['headers'].append(('Content-Type', 'application/json'))
-            state['headers'].append(('Content-Length', len(body[0])))
+            state['headers'].append(('Content-Length', str(len(body[0]))))
         else:
             body = app_iter
         return body

cloudpulse/common/exception.py

@@ -330,6 +330,10 @@ class TestAlreadyExists(Conflict):
     message = _("A test with UUID %(uuid)s already exists.")
 
 
+class TestInvalid(Invalid):
+    message = _("The test name %(test)s is invalid")
+
+
 class NotSupported(CloudpulseException):
     message = _("%(operation)s is not supported.")
     code = 400

cloudpulse/db/sqlalchemy/api.py

@@ -15,11 +15,13 @@
 """SQLAlchemy storage backend."""
 
 from cloudpulse.common import exception
+from cloudpulse.common.plugin import discover
 from cloudpulse.common import utils
 from cloudpulse.db import api
 from cloudpulse.db.sqlalchemy import models
 from cloudpulse.openstack.common._i18n import _
 from cloudpulse.openstack.common import log
+from cloudpulse.scenario import base
 from oslo_config import cfg
 from oslo_db import exception as db_exc
 from oslo_db.sqlalchemy import session as db_session
@@ -132,6 +134,12 @@ class Connection(api.Connection):
                                sort_key, sort_dir, query)
 
     def create_test(self, values):
+        # ensure that  the test name is valid
+        discover.import_modules_from_package("cloudpulse.scenario.plugins")
+        plugins = discover.itersubclasses(base.Scenario)
+        if not any(values['name'] in dir(scenario) for scenario in plugins):
+            raise exception.TestInvalid(test=values['name'])
+
         # ensure defaults are present for new tests
         if not values.get('uuid'):
             values['uuid'] = utils.generate_uuid()