support setting the source and handler attribute in sensu notifications (#8405)

* support setting the handler attribute in sensu alert notifications

* allow the user to set the source attribute of Sensu notifications

pkg/services/alerting/notifiers/sensu.go

 package notifiers
 
 import (
+	"strconv"
+	"strings"
+
 	"github.com/grafana/grafana/pkg/bus"
 	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/log"
 	"github.com/grafana/grafana/pkg/metrics"
 	m "github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/alerting"
-	"strconv"
-	"strings"
 )
 
 func init() {
@@ -24,6 +25,14 @@ func init() {
 				<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.url" placeholder="http://sensu-api.local:4567/results"></input>
       </div>
       <div class="gf-form">
+        <span class="gf-form-label width-10">Source</span>
+        <input type="text" class="gf-form-input max-width-14" ng-model="ctrl.model.settings.source"></input>
+      </div>
+      <div class="gf-form">
+        <span class="gf-form-label width-10">Handler</span>
+        <input type="text" class="gf-form-input max-width-14" ng-model="ctrl.model.settings.handler" placeholder="default"></input>
+      </div>
+      <div class="gf-form">
         <span class="gf-form-label width-10">Username</span>
         <input type="text" class="gf-form-input max-width-14" ng-model="ctrl.model.settings.username"></input>
       </div>
@@ -46,7 +55,9 @@ func NewSensuNotifier(model *m.AlertNotification) (alerting.Notifier, error) {
 		NotifierBase: NewNotifierBase(model.Id, model.IsDefault, model.Name, model.Type, model.Settings),
 		Url:          url,
 		User:         model.Settings.Get("username").MustString(),
+		Source:       model.Settings.Get("source").MustString(),
 		Password:     model.Settings.Get("password").MustString(),
+		Handler:      model.Settings.Get("handler").MustString(),
 		log:          log.New("alerting.notifier.sensu"),
 	}, nil
 }
@@ -54,8 +65,10 @@ func NewSensuNotifier(model *m.AlertNotification) (alerting.Notifier, error) {
 type SensuNotifier struct {
 	NotifierBase
 	Url      string
+	Source   string
 	User     string
 	Password string
+	Handler  string
 	log      log.Logger
 }
 
@@ -67,9 +80,13 @@ func (this *SensuNotifier) Notify(evalContext *alerting.EvalContext) error {
 	bodyJSON.Set("ruleId", evalContext.Rule.Id)
 	// Sensu alerts cannot have spaces in them
 	bodyJSON.Set("name", strings.Replace(evalContext.Rule.Name, " ", "_", -1))
-	// Sensu alerts require a command
-	// We set it to the grafana ruleID
-	bodyJSON.Set("source", "grafana_rule_"+strconv.FormatInt(evalContext.Rule.Id, 10))
+	// Sensu alerts require a source. We set it to the user-specified value (optional),
+	// else we fallback and use the grafana ruleID.
+	if this.Source != "" {
+		bodyJSON.Set("source", this.Source)
+	} else {
+		bodyJSON.Set("source", "grafana_rule_"+strconv.FormatInt(evalContext.Rule.Id, 10))
+	}
 	// Finally, sensu expects an output
 	// We set it to a default output
 	bodyJSON.Set("output", "Grafana Metric Condition Met")
@@ -83,6 +100,10 @@ func (this *SensuNotifier) Notify(evalContext *alerting.EvalContext) error {
 		bodyJSON.Set("status", 0)
 	}
 
+	if this.Handler != "" {
+		bodyJSON.Set("handler", this.Handler)
+	}
+
 	ruleUrl, err := evalContext.GetRuleUrl()
 	if err == nil {
 		bodyJSON.Set("ruleUrl", ruleUrl)

pkg/services/alerting/notifiers/sensu_test.go

@@ -29,7 +29,9 @@ func TestSensuNotifier(t *testing.T) {
 			Convey("from settings", func() {
 				json := `
 				{
-					"url": "http://sensu-api.example.com:4567/results"
+					"url": "http://sensu-api.example.com:4567/results",
+					"source": "grafana_instance_01",
+					"handler": "myhandler"
 				}`
 
 				settingsJSON, _ := simplejson.NewJson([]byte(json))
@@ -46,6 +48,8 @@ func TestSensuNotifier(t *testing.T) {
 				So(sensuNotifier.Name, ShouldEqual, "sensu")
 				So(sensuNotifier.Type, ShouldEqual, "sensu")
 				So(sensuNotifier.Url, ShouldEqual, "http://sensu-api.example.com:4567/results")
+				So(sensuNotifier.Source, ShouldEqual, "grafana_instance_01")
+				So(sensuNotifier.Handler, ShouldEqual, "myhandler")
 			})
 		})
 	})