alerting: fixes validation error when saving alerts in dash

If a panelId in the dashboard json is set to zero then the validation
silently fails. Instead of returning an error, it just ignores alerts and
saves the dashboard.

(cherry picked from commit d96fbb486f)

pkg/services/alerting/extractor.go

@@ -143,10 +143,15 @@ func (e *DashAlertExtractor) GetAlertFromPanels(jsonWithPanels *simplejson.Json)
 
 		// validate
 		_, err = NewRuleFromDBAlert(alert)
-		if err == nil && alert.ValidToSave() {
+		if err != nil {
+			return nil, err
+		}
+
+		if alert.ValidToSave() {
 			alerts = append(alerts, alert)
 		} else {
-			return nil, err
+			e.log.Debug("Invalid Alert Data. Dashboard, Org or Panel ID is not correct", "alertName", alert.Name, "panelId", alert.PanelId)
+			return nil, m.ErrDashboardContainsInvalidAlertData
 		}
 	}
 

pkg/services/alerting/extractor_test.go

@@ -150,6 +150,22 @@ func TestAlertRuleExtraction(t *testing.T) {
 			})
 		})
 
+		Convey("Panel with id set to zero should return error", func() {
+			panelWithIdZero, err := ioutil.ReadFile("./test-data/panel-with-id-0.json")
+			So(err, ShouldBeNil)
+
+			dashJson, err := simplejson.NewJson([]byte(panelWithIdZero))
+			So(err, ShouldBeNil)
+			dash := m.NewDashboardFromJson(dashJson)
+			extractor := NewDashAlertExtractor(dash, 1)
+
+			_, err = extractor.GetAlerts()
+
+			Convey("panel with id 0 should return error", func() {
+				So(err, ShouldNotBeNil)
+			})
+		})
+
 		Convey("Parse alerts from dashboard without rows", func() {
 			json, err := ioutil.ReadFile("./test-data/v5-dashboard.json")
 			So(err, ShouldBeNil)

pkg/services/alerting/test-data/panel-with-id-0.json

@@ -0,0 +1,63 @@
+{
+  "id": 57,
+  "title": "Graphite 4",
+  "originalTitle": "Graphite 4",
+  "tags": ["graphite"],
+  "rows": [
+  {
+    "panels": [
+    {
+      "title": "Active desktop users",
+      "id": 0,
+      "editable": true,
+      "type": "graph",
+      "targets": [
+      {
+        "refId": "A",
+        "target": "aliasByNode(statsd.fakesite.counters.session_start.desktop.count, 4)"
+      }
+      ],
+      "datasource": null,
+      "alert": {
+        "name": "name1",
+        "message": "desc1",
+        "handler": 1,
+        "frequency": "60s",
+        "conditions": [
+        {
+          "type": "query",
+          "query": {"params": ["A", "5m", "now"]},
+          "reducer": {"type": "avg", "params": []},
+          "evaluator": {"type": ">", "params": [100]}
+        }
+        ]
+      }
+    },
+    {
+      "title": "Active mobile users",
+      "id": 4,
+      "targets": [
+        {"refId": "A", "target": ""},
+        {"refId": "B", "target": "aliasByNode(statsd.fakesite.counters.session_start.mobile.count, 4)"}
+      ],
+      "datasource": "graphite2",
+      "alert": {
+        "name": "name2",
+        "message": "desc2",
+        "handler": 0,
+        "frequency": "60s",
+        "severity": "warning",
+        "conditions": [
+        {
+          "type": "query",
+          "query":  {"params": ["B", "5m", "now"]},
+          "reducer": {"type": "avg", "params": []},
+          "evaluator": {"type": ">", "params": [100]}
+        }
+        ]
+      }
+    }
+    ]
+  }
+]
+      }