Add source status API and enhance dashboard with data source checks

- Introduced a new API endpoint `/api/source-status/` to return the status of Prometheus and OpenStack data sources.
- Implemented lightweight health check functions for both Prometheus and OpenStack.
- Updated the dashboard template to display the status of data sources dynamically.
- Added tests for the new API endpoint to ensure correct functionality and response handling.
- Configured a cache timeout for source status checks to improve performance.

dashboard/tests/test_views.py

@@ -12,6 +12,7 @@ from dashboard.views import (
     collect_audits,
     api_stats,
     api_audits,
+    api_source_status,
 )
 
 
@@ -259,3 +260,102 @@ class ApiAuditsTest(TestCase):
         data = json.loads(response.content)
         self.assertEqual(data["audits"][0]["name"], "Cached Audit")
         self.assertEqual(data["current_cluster"], cached_cluster)
+
+
+class ApiSourceStatusTest(TestCase):
+    """Tests for api_source_status view."""
+
+    def setUp(self):
+        self.factory = RequestFactory()
+
+    @patch("dashboard.views.settings")
+    def test_api_source_status_mock_returns_mock_status(self, mock_settings):
+        mock_settings.USE_MOCK_DATA = True
+        mock_settings.SOURCE_STATUS_CACHE_TTL = 30
+        request = self.factory.get("/api/source-status/")
+        response = api_source_status(request)
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response["Content-Type"], "application/json")
+        data = json.loads(response.content)
+        self.assertEqual(data["prometheus"]["status"], "mock")
+        self.assertEqual(data["openstack"]["status"], "mock")
+
+    @patch("dashboard.views.check_openstack")
+    @patch("dashboard.views.check_prometheus")
+    @patch("dashboard.views.settings")
+    def test_api_source_status_both_ok_returns_ok(
+        self, mock_settings, mock_check_prometheus, mock_check_openstack
+    ):
+        mock_settings.USE_MOCK_DATA = False
+        mock_settings.SOURCE_STATUS_CACHE_TTL = 30
+        mock_check_prometheus.return_value = {"status": "ok"}
+        mock_check_openstack.return_value = {"status": "ok"}
+        cache.clear()
+        request = self.factory.get("/api/source-status/")
+        response = api_source_status(request)
+        self.assertEqual(response.status_code, 200)
+        data = json.loads(response.content)
+        self.assertEqual(data["prometheus"]["status"], "ok")
+        self.assertEqual(data["openstack"]["status"], "ok")
+        mock_check_prometheus.assert_called_once()
+        mock_check_openstack.assert_called_once()
+
+    @patch("dashboard.views.check_openstack")
+    @patch("dashboard.views.check_prometheus")
+    @patch("dashboard.views.settings")
+    def test_api_source_status_prometheus_error_returns_error_message(
+        self, mock_settings, mock_check_prometheus, mock_check_openstack
+    ):
+        mock_settings.USE_MOCK_DATA = False
+        mock_settings.SOURCE_STATUS_CACHE_TTL = 30
+        mock_check_prometheus.return_value = {"status": "error", "message": "Connection refused"}
+        mock_check_openstack.return_value = {"status": "ok"}
+        cache.clear()
+        request = self.factory.get("/api/source-status/")
+        response = api_source_status(request)
+        self.assertEqual(response.status_code, 200)
+        data = json.loads(response.content)
+        self.assertEqual(data["prometheus"]["status"], "error")
+        self.assertEqual(data["prometheus"]["message"], "Connection refused")
+        self.assertEqual(data["openstack"]["status"], "ok")
+
+    @patch("dashboard.views.check_openstack")
+    @patch("dashboard.views.check_prometheus")
+    @patch("dashboard.views.settings")
+    def test_api_source_status_openstack_error_returns_error_message(
+        self, mock_settings, mock_check_prometheus, mock_check_openstack
+    ):
+        mock_settings.USE_MOCK_DATA = False
+        mock_settings.SOURCE_STATUS_CACHE_TTL = 30
+        mock_check_prometheus.return_value = {"status": "ok"}
+        mock_check_openstack.return_value = {"status": "error", "message": "Auth failed"}
+        cache.clear()
+        request = self.factory.get("/api/source-status/")
+        response = api_source_status(request)
+        self.assertEqual(response.status_code, 200)
+        data = json.loads(response.content)
+        self.assertEqual(data["prometheus"]["status"], "ok")
+        self.assertEqual(data["openstack"]["status"], "error")
+        self.assertEqual(data["openstack"]["message"], "Auth failed")
+
+    @patch("dashboard.views.check_openstack")
+    @patch("dashboard.views.check_prometheus")
+    @patch("dashboard.views.settings")
+    def test_api_source_status_uses_cache(
+        self, mock_settings, mock_check_prometheus, mock_check_openstack
+    ):
+        mock_settings.USE_MOCK_DATA = False
+        mock_settings.SOURCE_STATUS_CACHE_TTL = 30
+        cache.clear()
+        cached = {
+            "prometheus": {"status": "ok"},
+            "openstack": {"status": "ok"},
+        }
+        cache.set("dashboard_source_status", cached, timeout=30)
+        request = self.factory.get("/api/source-status/")
+        response = api_source_status(request)
+        mock_check_prometheus.assert_not_called()
+        mock_check_openstack.assert_not_called()
+        data = json.loads(response.content)
+        self.assertEqual(data["prometheus"]["status"], "ok")
+        self.assertEqual(data["openstack"]["status"], "ok")