Fix: When workflow already executed. After controller restart, healthcheck could never be scheduled

.gitignore

@@ -6,6 +6,7 @@
 *.so
 *.dylib
 testbin/*
+active-monitor-controller
 
 # Temporary or metadata files
 *.yaml-e

Dockerfile-local

@@ -0,0 +1,6 @@
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static:latest
+WORKDIR /
+COPY active-monitor-controller .
+ENTRYPOINT [ "/active-monitor-controller" ]

Makefile

@@ -72,6 +72,10 @@ test: manifests generate fmt vet envtest ## Run tests.
 build: manifests generate fmt vet ## Build manager binary.
 	go build -o bin/manager cmd/main.go
 
+.PHONY: build-amd64
+build: manifests generate fmt vet ## Build manager binary.
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o active-monitor-controller cmd/main.go
+
 .PHONY: run
 run: manifests generate fmt vet ## Run a controller from your host.
 	go run ./cmd/main.go
@@ -83,6 +87,10 @@ run: manifests generate fmt vet ## Run a controller from your host.
 docker-build: ## Build docker image with the manager.
 	$(CONTAINER_TOOL) build -t ${IMG} .
 
+.PHONY: docker-build-local
+docker-build: ## Build docker image with the manager.
+	$(CONTAINER_TOOL) build -t ${IMG} -f Dockerfile-local .
+
 .PHONY: docker-push
 docker-push: ## Push docker image with the manager.
 	$(CONTAINER_TOOL) push ${IMG}

internal/controllers/healthcheck_controller.go

@@ -189,6 +189,7 @@
 		var finishedAtTime int64
 		if healthCheck.Status.FinishedAt != nil {
 			finishedAtTime = healthCheck.Status.FinishedAt.Time.Unix()
+			log.Info("FinishedAtTime", "finishedAtTime", finishedAtTime)
 		}
 
 		// workflows can be paused by setting repeatAfterSec to <= 0 and not specifying the schedule for cron.
@@ -217,8 +218,8 @@
 			// we need to update the spec so have to healthCheck.Spec.RepeatAfterSec instead of local variable hcSpec
 			healthCheck.Spec.RepeatAfterSec = int(schedule.Next(time.Now()).Sub(time.Now())/time.Second) + 1
 			log.Info("spec.RepeatAfterSec value is set", "RepeatAfterSec", healthCheck.Spec.RepeatAfterSec)
-		} else if int(time.Now().Unix()-finishedAtTime) < hcSpec.RepeatAfterSec {
-			log.Info("Workflow already executed", "finishedAtTime", finishedAtTime)
+		} else if int(time.Now().Unix()-finishedAtTime) < hcSpec.RepeatAfterSec && r.RepeatTimersByName[healthCheck.GetName()] != nil {
+			log.Info("Workflow already executed, and there is repeat schedule has been added to RepeatTimersByName map", "finishedAtTime", finishedAtTime)
 			return ctrl.Result{}, nil
 		}
 
@@ -421,18 +422,25 @@
 // this function exists to assist with how a function called by the timer.AfterFunc() method operates to call a
 // function which takes parameters, it is easiest to build this closure which holds access to the parameters we need.
 // the helper returns a function object taking no parameters directly, this is what we want to give AfterFunc
-func (r *HealthCheckReconciler) createSubmitWorkflowHelper(ctx context.Context, log logr.Logger, wfNamespace string, hc *activemonitorv1alpha1.HealthCheck) func() {
+func (r *HealthCheckReconciler) createSubmitWorkflowHelper(ctx context.Context, log logr.Logger, wfNamespace string, prevHealthCheck *activemonitorv1alpha1.HealthCheck) func() {
 	return func() {
 		log.Info("Creating and Submitting Workflow...")
-		wfName, err := r.createSubmitWorkflow(ctx, log, hc)
+
+		healthCheckInstance := &activemonitorv1alpha1.HealthCheck{}
+		if err := r.Get(ctx, client.ObjectKey{Name: prevHealthCheck.Name, Namespace: prevHealthCheck.Namespace}, healthCheckInstance); err != nil {
+			log.Error(err, "Error getting healthcheck resource")
+			return
+		}
+
+		wfName, err := r.createSubmitWorkflow(ctx, log, healthCheckInstance)
 		if err != nil {
 			log.Error(err, "Error creating or submitting workflow")
-			r.Recorder.Event(hc, v1.EventTypeWarning, "Warning", "Error creating or submitting workflow")
+			r.Recorder.Event(healthCheckInstance, v1.EventTypeWarning, "Warning", "Error creating or submitting workflow")
 		}
-		err = r.watchWorkflowReschedule(ctx, ctrl.Request{}, log, wfNamespace, wfName, hc)
+		err = r.watchWorkflowReschedule(ctx, ctrl.Request{}, log, wfNamespace, wfName, healthCheckInstance)
 		if err != nil {
 			log.Error(err, "Error watching or rescheduling workflow")
-			r.Recorder.Event(hc, v1.EventTypeWarning, "Warning", "Error watching or rescheduling workflow")
+			r.Recorder.Event(healthCheckInstance, v1.EventTypeWarning, "Warning", "Error watching or rescheduling workflow")
 		}
 	}
 }
@@ -652,6 +660,8 @@
 				break
 			}
 		}
+
+		log.Info("waiting for workflow to complete", "namespace", wfNamespace, "name", wfName)
 	}
 
 	// since the workflow has taken an unknown duration of time to complete, it's possible that its parent

internal/controllers/healthcheck_controller_test.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"testing"
 	"time"
 
@@ -21,15 +21,19 @@ import (
 )
 
 var (
-	healthCheckNamespace = "health"
-	healthCheckName      = "inline-monitor-remedy"
-	healthCheckKey       = types.NamespacedName{Name: healthCheckName, Namespace: healthCheckNamespace}
-	healthCheckNameNs    = "inline-monitor-remedy-namespace"
-	healthCheckKeyNs     = types.NamespacedName{Name: healthCheckNameNs, Namespace: healthCheckNamespace}
-	healthCheckNamePause = "inline-hello-pause"
-	healthCheckKeyPause  = types.NamespacedName{Name: healthCheckNamePause, Namespace: healthCheckNamespace}
-	healthCheckNameRetry = "inline-hello-custom-retry"
-	healthCheckKeyRetry  = types.NamespacedName{Name: healthCheckNameRetry, Namespace: healthCheckNamespace}
+	healthCheckNamespace           = "health"
+	healthCheckName                = "inline-monitor-remedy"
+	healthCheckKey                 = types.NamespacedName{Name: healthCheckName, Namespace: healthCheckNamespace}
+	healthCheckNameNs              = "inline-monitor-remedy-namespace"
+	healthCheckKeyNs               = types.NamespacedName{Name: healthCheckNameNs, Namespace: healthCheckNamespace}
+	healthCheckNamePause           = "inline-hello-pause"
+	healthCheckKeyPause            = types.NamespacedName{Name: healthCheckNamePause, Namespace: healthCheckNamespace}
+	healthCheckNameRetry           = "inline-hello-custom-retry"
+	healthCheckKeyRetry            = types.NamespacedName{Name: healthCheckNameRetry, Namespace: healthCheckNamespace}
+	healthCheckAlreadyScheduled    = "inline-monitor-remedy-already-scheduled"
+	healthCheckKeyAlreadyScheduled = types.NamespacedName{Name: healthCheckAlreadyScheduled, Namespace: healthCheckNamespace}
+
+	sharedCtrl *HealthCheckReconciler
 )
 
 const timeout = time.Second * 60
@@ -38,8 +42,7 @@ var _ = Describe("Active-Monitor Controller", func() {
 	Describe("healthCheck CR can be reconciled at cluster level", func() {
 		var instance *activemonitorv1alpha1.HealthCheck
 		It("instance should be parsable", func() {
-			// healthCheckYaml, err := ioutil.ReadFile("../examples/inlineHello.yaml")
-			healthCheckYaml, err := ioutil.ReadFile("../../examples/bdd/inlineMemoryRemedyUnitTest.yaml")
+			healthCheckYaml, err := os.ReadFile("../../examples/bdd/inlineMemoryRemedyUnitTest.yaml")
 			Expect(err).ToNot(HaveOccurred())
 			instance, err = parseHealthCheckYaml(healthCheckYaml)
 			Expect(err).ToNot(HaveOccurred())
@@ -77,8 +80,8 @@ var _ = Describe("Active-Monitor Controller", func() {
 		var instance *activemonitorv1alpha1.HealthCheck
 
 		It("instance should be parsable", func() {
-			// healthCheckYaml, err := ioutil.ReadFile("../examples/inlineHello.yaml")
-			healthCheckYaml, err := ioutil.ReadFile("../../examples/bdd/inlineMemoryRemedyUnitTest_Namespace.yaml")
+			// healthCheckYaml, err := os.ReadFile("../examples/inlineHello.yaml")
+			healthCheckYaml, err := os.ReadFile("../../examples/bdd/inlineMemoryRemedyUnitTest_Namespace.yaml")
 			Expect(err).ToNot(HaveOccurred())
 
 			instance, err = parseHealthCheckYaml(healthCheckYaml)
@@ -117,7 +120,7 @@ var _ = Describe("Active-Monitor Controller", func() {
 		var instance *activemonitorv1alpha1.HealthCheck
 
 		It("instance should be parsable", func() {
-			healthCheckYaml, err := ioutil.ReadFile("../../examples/bdd/inlineHelloTest.yaml")
+			healthCheckYaml, err := os.ReadFile("../../examples/bdd/inlineHelloTest.yaml")
 			Expect(err).ToNot(HaveOccurred())
 
 			instance, err = parseHealthCheckYaml(healthCheckYaml)
@@ -152,11 +155,55 @@ var _ = Describe("Active-Monitor Controller", func() {
 		})
 	})
 
+	Describe("healthCheck CR will be reconcile if it is executed and rescheduled", func() {
+		var instance *activemonitorv1alpha1.HealthCheck
+
+		It("instance should be parsable", func() {
+			healthCheckYaml, err := os.ReadFile("../../examples/bdd/inlineHelloTest.yaml")
+			Expect(err).ToNot(HaveOccurred())
+
+			instance, err = parseHealthCheckYaml(healthCheckYaml)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(instance).To(BeAssignableToTypeOf(&activemonitorv1alpha1.HealthCheck{}))
+			Expect(instance.GetName()).To(Equal(healthCheckNamePause))
+		})
+
+		It("instance should be reconciled", func() {
+			instance.SetNamespace(healthCheckNamespace)
+			instance.SetName(healthCheckAlreadyScheduled)
+			instance.Spec.RepeatAfterSec = 60
+			sharedCtrl.RepeatTimersByName[instance.Name] = time.AfterFunc(time.Second*60, func() {})
+
+			err := k8sClient.Create(context.TODO(), instance)
+			if apierrors.IsInvalid(err) {
+				log.Error(err, "failed to create object, got an invalid object error")
+				return
+			}
+			Expect(err).NotTo(HaveOccurred())
+			defer k8sClient.Delete(context.TODO(), instance)
+
+			Eventually(func() error {
+				if err := k8sClient.Get(context.TODO(), healthCheckKeyAlreadyScheduled, instance); err != nil {
+					return err
+				}
+
+				if instance.Status.StartedAt != nil {
+					return nil
+				}
+				return fmt.Errorf("HealthCheck is not valid")
+				// return nil
+			}, timeout).Should(Succeed())
+
+			By("Verify healthCheck has been reconciled by checking for status")
+			Expect(instance.Status.ErrorMessage).ShouldNot(BeEmpty())
+		})
+	})
+
 	Describe("healthCheck CR will properly parse backoff customizations", func() {
 		var instance *activemonitorv1alpha1.HealthCheck
 
 		It("instance should be parsable", func() {
-			healthCheckYaml, err := ioutil.ReadFile("../../examples/bdd/inlineCustomBackoffTest.yaml")
+			healthCheckYaml, err := os.ReadFile("../../examples/bdd/inlineCustomBackoffTest.yaml")
 			Expect(err).ToNot(HaveOccurred())
 
 			instance, err = parseHealthCheckYaml(healthCheckYaml)

internal/controllers/suite_test.go

@@ -106,14 +106,15 @@ var _ = BeforeSuite(func() {
 	})
 	Expect(err).ToNot(HaveOccurred())
 
-	err = (&HealthCheckReconciler{
+	sharedCtrl = &HealthCheckReconciler{
 		Client:     k8sManager.GetClient(),
 		DynClient:  dynamic.NewForConfigOrDie(k8sManager.GetConfig()),
 		Recorder:   k8sManager.GetEventRecorderFor("HealthCheck"),
 		kubeclient: kubernetes.NewForConfigOrDie(k8sManager.GetConfig()),
 		Log:        log,
 		TimerLock:  sync.RWMutex{},
-	}).SetupWithManager(k8sManager)
+	}
+	err = sharedCtrl.SetupWithManager(k8sManager)
 	Expect(err).ToNot(HaveOccurred())
 
 	go func() {