alerting: make alert extractor backwards compatible

closes #10270

pkg/services/alerting/extractor.go

@@ -69,19 +69,10 @@ func copyJson(in *simplejson.Json) (*simplejson.Json, error) {
 	return simplejson.NewJson(rawJson)
 }
 
-func (e *DashAlertExtractor) GetAlerts() ([]*m.Alert, error) {
-	e.log.Debug("GetAlerts")
-
-	dashboardJson, err := copyJson(e.Dash.Data)
-	if err != nil {
-		return nil, err
-	}
-
+func (e *DashAlertExtractor) GetAlertFromPanels(jsonWithPanels *simplejson.Json) ([]*m.Alert, error) {
 	alerts := make([]*m.Alert, 0)
-	for _, rowObj := range dashboardJson.Get("rows").MustArray() {
-		row := simplejson.NewFromAny(rowObj)
 
-		for _, panelObj := range row.Get("panels").MustArray() {
+	for _, panelObj := range jsonWithPanels.Get("panels").MustArray() {
 		panel := simplejson.NewFromAny(panelObj)
 		jsonAlert, hasAlert := panel.CheckGet("alert")
 
@@ -158,6 +149,40 @@ func (e *DashAlertExtractor) GetAlerts() ([]*m.Alert, error) {
 			return nil, err
 		}
 	}
+
+	return alerts, nil
+}
+
+func (e *DashAlertExtractor) GetAlerts() ([]*m.Alert, error) {
+	e.log.Debug("GetAlerts")
+
+	dashboardJson, err := copyJson(e.Dash.Data)
+	if err != nil {
+		return nil, err
+	}
+
+	alerts := make([]*m.Alert, 0)
+
+	// We extract alerts from rows to be backwards compatible
+	// with the old dashboard json model.
+	rows := dashboardJson.Get("rows").MustArray()
+	if len(rows) > 0 {
+		for _, rowObj := range rows {
+			row := simplejson.NewFromAny(rowObj)
+			a, err := e.GetAlertFromPanels(row)
+			if err != nil {
+				return nil, err
+			}
+
+			alerts = append(alerts, a...)
+		}
+	} else {
+		a, err := e.GetAlertFromPanels(dashboardJson)
+		if err != nil {
+			return nil, err
+		}
+
+		alerts = append(alerts, a...)
 	}
 
 	e.log.Debug("Extracted alerts from dashboard", "alertCount", len(alerts))

pkg/services/alerting/extractor_test.go

@@ -155,11 +155,31 @@ func TestAlertRuleExtraction(t *testing.T) {
 			})
 		})
 
-		Convey("Parse and validate dashboard containing influxdb alert", func() {
-			json2, err := ioutil.ReadFile("./test-data/influxdb-alert.json")
+		Convey("Parse alerts from dashboard without rows", func() {
+			json, err := ioutil.ReadFile("./test-data/v5-dashboard.json")
 			So(err, ShouldBeNil)
 
-			dashJson, err := simplejson.NewJson(json2)
+			dashJson, err := simplejson.NewJson(json)
+			So(err, ShouldBeNil)
+			dash := m.NewDashboardFromJson(dashJson)
+			extractor := NewDashAlertExtractor(dash, 1)
+
+			alerts, err := extractor.GetAlerts()
+
+			Convey("Get rules without error", func() {
+				So(err, ShouldBeNil)
+			})
+
+			Convey("Should have 2 alert rule", func() {
+				So(len(alerts), ShouldEqual, 2)
+			})
+		})
+
+		Convey("Parse and validate dashboard containing influxdb alert", func() {
+			json, err := ioutil.ReadFile("./test-data/influxdb-alert.json")
+			So(err, ShouldBeNil)
+
+			dashJson, err := simplejson.NewJson(json)
 			So(err, ShouldBeNil)
 			dash := m.NewDashboardFromJson(dashJson)
 			extractor := NewDashAlertExtractor(dash, 1)

pkg/services/alerting/test-data/v5-dashboard.json

@@ -0,0 +1,60 @@
+{
+    "id": 57,
+    "title": "Graphite 4",
+    "originalTitle": "Graphite 4",
+    "tags": ["graphite"],
+      "panels": [
+      {
+        "title": "Active desktop users",
+        "editable": true,
+        "type": "graph",
+        "id": 3,
+        "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]}
+          }
+          ]
+        }
+
+    }
+  ]
+  }