feat(alerting): began work on testing alert rule from UI without having to save it

pkg/services/alerting/test_rule.go

@@ -0,0 +1,63 @@
+package alerting
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/grafana/grafana/pkg/bus"
+	"github.com/grafana/grafana/pkg/components/simplejson"
+	m "github.com/grafana/grafana/pkg/models"
+)
+
+type TestAlertRuleCommand struct {
+	Dashboard *simplejson.Json
+	PanelId   int64
+	OrgId     int64
+
+	Result *AlertResultContext
+}
+
+func init() {
+	bus.AddHandler("alerting", handleTestAlertRuleCommand)
+}
+
+func handleTestAlertRuleCommand(cmd *TestAlertRuleCommand) error {
+
+	dash, err := m.NewDashboardFromJson(cmd.Dashboard)
+	if err != nil {
+		return err
+	}
+
+	extractor := NewDashAlertExtractor(cmd.Dashboard)
+	rules, err := extractor.GetAlerts()
+	if err != nil {
+		return err
+	}
+
+	for _, rule := range rules {
+		if rule.PanelId == cmd.PanelId {
+			if res, err := testAlertRule(rule); err != nil {
+				return err
+			} else {
+				cmd.Result = res
+				return nil
+			}
+		}
+	}
+
+	return fmt.Errorf("Could not find alert with panel id %d", cmd.PanelId)
+}
+
+func testAlertRule(rule *AlertRule) (*AlertResultContext, error) {
+	handler := NewHandler()
+
+	resultChan := make(chan *AlertResultContext, 1)
+	handler.Execute(rule, resultChan)
+
+	select {
+	case <-time.After(time.Second * 10):
+		return &AlertResultContext{Error: fmt.Errorf("Timeout")}, nil
+	case result := <-resultChan:
+		return result, nil
+	}
+}