Move observer to metrics package

cmd/flagger/main.go

@@ -7,6 +7,7 @@ import (
 	informers "github.com/weaveworks/flagger/pkg/client/informers/externalversions"
 	"github.com/weaveworks/flagger/pkg/controller"
 	"github.com/weaveworks/flagger/pkg/logging"
+	"github.com/weaveworks/flagger/pkg/metrics"
 	"github.com/weaveworks/flagger/pkg/notifier"
 	"github.com/weaveworks/flagger/pkg/server"
 	"github.com/weaveworks/flagger/pkg/signals"
@@ -105,7 +106,7 @@ func main() {
 		logger.Infof("Watching namespace %s", namespace)
 	}
 
-	ok, err := controller.CheckMetricsServer(metricsServer)
+	ok, err := metrics.CheckMetricsServer(metricsServer)
 	if ok {
 		logger.Infof("Connected to metrics server %s", metricsServer)
 	} else {

pkg/controller/controller.go

@@ -42,7 +42,7 @@ type Controller struct {
 	canaries      *sync.Map
 	jobs          map[string]CanaryJob
 	deployer      CanaryDeployer
-	observer      CanaryObserver
+	observer      metrics.CanaryObserver
 	recorder      metrics.CanaryRecorder
 	notifier      *notifier.Slack
 	meshProvider  string
@@ -81,10 +81,6 @@ func NewController(
 		},
 	}
 
-	observer := CanaryObserver{
-		metricsServer: metricServer,
-	}
-
 	recorder := metrics.NewCanaryRecorder(controllerAgentName, true)
 	recorder.SetInfo(version, meshProvider)
 
@@ -101,7 +97,7 @@ func NewController(
 		jobs:          map[string]CanaryJob{},
 		flaggerWindow: flaggerWindow,
 		deployer:      deployer,
-		observer:      observer,
+		observer:      metrics.NewObserver(metricServer),
 		recorder:      recorder,
 		notifier:      notifier,
 		meshProvider:  meshProvider,

pkg/controller/controller_test.go

@@ -35,7 +35,7 @@ type Mocks struct {
 	meshClient    clientset.Interface
 	flaggerClient clientset.Interface
 	deployer      CanaryDeployer
-	observer      CanaryObserver
+	observer      metrics.CanaryObserver
 	ctrl          *Controller
 	logger        *zap.SugaredLogger
 	router        router.Interface
@@ -74,9 +74,6 @@ func SetupMocks(abtest bool) Mocks {
 			flaggerClient: flaggerClient,
 		},
 	}
-	observer := CanaryObserver{
-		metricsServer: "fake",
-	}
 
 	// init controller
 	flaggerInformerFactory := informers.NewSharedInformerFactory(flaggerClient, noResyncPeriodFunc())
@@ -94,7 +91,7 @@ func SetupMocks(abtest bool) Mocks {
 		canaries:      new(sync.Map),
 		flaggerWindow: time.Second,
 		deployer:      deployer,
-		observer:      observer,
+		observer:      metrics.NewObserver("fake"),
 		recorder:      metrics.NewCanaryRecorder(controllerAgentName, false),
 	}
 	ctrl.flaggerSynced = alwaysReady

pkg/controller/scheduler.go

@@ -501,7 +501,7 @@ func (c *Controller) analyseCanary(r *flaggerv1.Canary) bool {
 					c.recordEventWarningf(r, "Halt advancement no values found for metric %s probably %s.%s is not receiving traffic",
 						metric.Name, r.Spec.TargetRef.Name, r.Namespace)
 				} else {
-					c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.metricsServer, err)
+					c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.GetMetricsServer(), err)
 				}
 				return false
 			}
@@ -519,7 +519,7 @@ func (c *Controller) analyseCanary(r *flaggerv1.Canary) bool {
 					c.recordEventWarningf(r, "Halt advancement no values found for metric %s probably %s.%s is not receiving traffic",
 						metric.Name, r.Spec.TargetRef.Name, r.Namespace)
 				} else {
-					c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.metricsServer, err)
+					c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.GetMetricsServer(), err)
 				}
 				return false
 			}
@@ -533,7 +533,7 @@ func (c *Controller) analyseCanary(r *flaggerv1.Canary) bool {
 		if metric.Name == "istio_request_duration_seconds_bucket" {
 			val, err := c.observer.GetDeploymentHistogram(r.Spec.TargetRef.Name, r.Namespace, metric.Name, metric.Interval)
 			if err != nil {
-				c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.metricsServer, err)
+				c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.GetMetricsServer(), err)
 				return false
 			}
 			t := time.Duration(metric.Threshold) * time.Millisecond
@@ -551,7 +551,7 @@ func (c *Controller) analyseCanary(r *flaggerv1.Canary) bool {
 					c.recordEventWarningf(r, "Halt advancement no values found for metric %s probably %s.%s is not receiving traffic",
 						metric.Name, r.Spec.TargetRef.Name, r.Namespace)
 				} else {
-					c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.metricsServer, err)
+					c.recordEventErrorf(r, "Metrics server %s query failed: %v", c.observer.GetMetricsServer(), err)
 				}
 				return false
 			}

pkg/metrics/observer.go

@@ -1,4 +1,4 @@
-package controller
+package metrics
 
 import (
 	"context"
@@ -29,6 +29,16 @@ type vectorQueryResponse struct {
 	}
 }
 
+func NewObserver(metricsServer string) CanaryObserver {
+	return CanaryObserver{
+		metricsServer: metricsServer,
+	}
+}
+
+func (c *CanaryObserver) GetMetricsServer() string {
+	return c.metricsServer
+}
+
 func (c *CanaryObserver) queryMetric(query string) (*vectorQueryResponse, error) {
 	promURL, err := url.Parse(c.metricsServer)
 	if err != nil {

pkg/metrics/observer_test.go

@@ -1,4 +1,4 @@
-package controller
+package metrics
 
 import (
 	"net/http"