Add strict Boolean checking for storage pools

There is no strict boolean checking for the parameter
"detail" of API /scheduler-states/get_pools, so that
any invalid boolean value can be specified.
This patch adds a strict checking for it to prevent
invalid value, and adds a test for this change as well.

Change-Id: Ic24850e5a0e206548de81529179cd182d9eabb7f
Partial-Bug: #1594261

cinder/api/contrib/scheduler_stats.py

@@ -18,6 +18,7 @@ from cinder.api import extensions
 from cinder.api.openstack import wsgi
 from cinder.api.views import scheduler_stats as scheduler_stats_view
 from cinder.scheduler import rpcapi
+from cinder import utils
 
 
 def authorize(context, action_name):
@@ -40,7 +41,7 @@ class SchedulerStatsController(wsgi.Controller):
         authorize(context, 'get_pools')
 
         # TODO(zhiteng) Add filters support
-        detail = req.params.get('detail', False)
+        detail = utils.get_bool_param('detail', req.params)
         pools = self.scheduler_api.get_pools(context, filters=None)
 
         return self._view_builder.pools(req, pools, detail)

cinder/tests/unit/api/contrib/test_scheduler_stats.py

@@ -18,6 +18,7 @@ import mock
 
 from cinder.api.contrib import scheduler_stats
 from cinder import context
+from cinder import exception
 from cinder import test
 from cinder.tests.unit.api import fakes
 from cinder.tests.unit import fake_constants as fake
@@ -111,3 +112,12 @@ class SchedulerStatsAPITest(test.TestCase):
         }
 
         self.assertDictMatch(expected, res)
+
+    def test_get_pools_detail_invalid_bool(self):
+        req = fakes.HTTPRequest.blank(
+            '/v2/%s/scheduler_stats?detail=InvalidBool' %
+            fake.PROJECT_ID)
+        req.environ['cinder.context'] = self.ctxt
+        self.assertRaises(exception.InvalidParameterValue,
+                          self.controller.get_pools,
+                          req)