Add Slack notifications for canary events

cmd/flagger/main.go

@@ -12,6 +12,7 @@ import (
 	informers "github.com/stefanprodan/flagger/pkg/client/informers/externalversions"
 	"github.com/stefanprodan/flagger/pkg/controller"
 	"github.com/stefanprodan/flagger/pkg/logging"
+	"github.com/stefanprodan/flagger/pkg/notifier"
 	"github.com/stefanprodan/flagger/pkg/server"
 	"github.com/stefanprodan/flagger/pkg/version"
 	"k8s.io/client-go/kubernetes"
@@ -27,6 +28,9 @@ var (
 	controlLoopInterval time.Duration
 	logLevel            string
 	port                string
+	slackURL            string
+	slackUser           string
+	slackChannel        string
 )
 
 func init() {
@@ -36,6 +40,9 @@ func init() {
 	flag.DurationVar(&controlLoopInterval, "control-loop-interval", 10*time.Second, "wait interval between rollouts")
 	flag.StringVar(&logLevel, "log-level", "debug", "Log level can be: debug, info, warning, error.")
 	flag.StringVar(&port, "port", "8080", "Port to listen on.")
+	flag.StringVar(&slackURL, "slack-url", "", "Slack hook URL.")
+	flag.StringVar(&slackUser, "slack-user", "flagger", "Slack user name.")
+	flag.StringVar(&slackChannel, "slack-channel", "", "Slack channel.")
 }
 
 func main() {
@@ -88,6 +95,16 @@ func main() {
 		logger.Errorf("Metrics server %s unreachable %v", metricsServer, err)
 	}
 
+	var slack *notifier.Slack
+	if slackURL != "" {
+		slack, err = notifier.NewSlack(slackURL, slackUser, slackChannel)
+		if err != nil {
+			logger.Errorf("Notifier %v", err)
+		} else {
+			logger.Infof("Slack notifications enabled for channel %s", slack.Channel)
+		}
+	}
+
 	// start HTTP server
 	go server.ListenAndServe(port, 3*time.Second, logger, stopCh)
 
@@ -99,6 +116,7 @@ func main() {
 		controlLoopInterval,
 		metricsServer,
 		logger,
+		slack,
 	)
 
 	flaggerInformerFactory.Start(stopCh)

pkg/controller/controller.go

@@ -12,6 +12,7 @@ import (
 	flaggerscheme "github.com/stefanprodan/flagger/pkg/client/clientset/versioned/scheme"
 	flaggerinformers "github.com/stefanprodan/flagger/pkg/client/informers/externalversions/flagger/v1alpha1"
 	flaggerlisters "github.com/stefanprodan/flagger/pkg/client/listers/flagger/v1alpha1"
+	"github.com/stefanprodan/flagger/pkg/notifier"
 	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -43,6 +44,7 @@ type Controller struct {
 	router        CanaryRouter
 	observer      CanaryObserver
 	recorder      CanaryRecorder
+	notifier      *notifier.Slack
 }
 
 func NewController(
@@ -53,6 +55,7 @@ func NewController(
 	flaggerWindow time.Duration,
 	metricServer string,
 	logger *zap.SugaredLogger,
+	notifier *notifier.Slack,
 
 ) *Controller {
 	logger.Debug("Creating event broadcaster")
@@ -100,6 +103,7 @@ func NewController(
 		router:        router,
 		observer:      observer,
 		recorder:      recorder,
+		notifier:      notifier,
 	}
 
 	flaggerInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
@@ -256,6 +260,17 @@ func (c *Controller) recordEventWarningf(r *flaggerv1.Canary, template string, a
 	c.eventRecorder.Event(r, corev1.EventTypeWarning, "Synced", fmt.Sprintf(template, args...))
 }
 
+func (c *Controller) sendNotification(workload string, namespace string, message string, warn bool) {
+	if c.notifier == nil {
+		return
+	}
+
+	err := c.notifier.Post(workload, namespace, message, warn)
+	if err != nil {
+		c.logger.Error(err)
+	}
+}
+
 func int32p(i int32) *int32 {
 	return &i
 }

pkg/controller/scheduler.go

@@ -110,6 +110,8 @@ func (c *Controller) advanceCanary(name string, namespace string) {
 			return
 		}
 		c.recorder.SetStatus(cd)
+		c.sendNotification(cd.Spec.TargetRef.Name, cd.Namespace,
+			"Canary analysis failed, rollback finished.", true)
 		return
 	}
 
@@ -180,6 +182,8 @@ func (c *Controller) advanceCanary(name string, namespace string) {
 			return
 		}
 		c.recorder.SetStatus(cd)
+		c.sendNotification(cd.Spec.TargetRef.Name, cd.Namespace,
+			"Canary analysis completed successfully, promotion finished.", false)
 	}
 }
 
@@ -196,11 +200,15 @@ func (c *Controller) checkCanaryStatus(cd *flaggerv1.Canary, deployer CanaryDepl
 		}
 		c.recorder.SetStatus(cd)
 		c.recordEventInfof(cd, "Initialization done! %s.%s", cd.Name, cd.Namespace)
+		c.sendNotification(cd.Spec.TargetRef.Name, cd.Namespace,
+			"New deployment detected, initialization completed.", false)
 		return false
 	}
 
 	if diff, err := deployer.IsNewSpec(cd); diff {
 		c.recordEventInfof(cd, "New revision detected! Scaling up %s.%s", cd.Spec.TargetRef.Name, cd.Namespace)
+		c.sendNotification(cd.Spec.TargetRef.Name, cd.Namespace,
+			"New revision detected, starting canary analysis.", false)
 		if err = deployer.Scale(cd, 1); err != nil {
 			c.recordEventErrorf(cd, "%v", err)
 			return false