Switch to gocron v2 and fix flaky ci (#198)

* Switch to gocron v2 and fix flaky ci

* Fix scheduler var name

* Revert chart bump

Author: adriananeci

Diff for: cmd/root.go

@@ -12,6 +12,7 @@ governing permissions and limitations under the License.
 package cmd
 
 import (
+	"github.com/google/uuid"
 	"strings"
 	"time"
 
@@ -20,7 +21,7 @@ import (
 	"github.com/adobe/k8s-shredder/pkg/metrics"
 	"github.com/adobe/k8s-shredder/pkg/utils"
 	"github.com/fsnotify/fsnotify"
-	"github.com/go-co-op/gocron"
+	"github.com/go-co-op/gocron/v2"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -32,7 +33,7 @@ var (
 	metricsPort                  int
 	cfg                          config.Config
 	appContext                   *utils.AppContext
-	scheduler                    *gocron.Scheduler
+	scheduler                    gocron.Scheduler
 
 	rootCmd = &cobra.Command{
 		Use:              "k8s-shredder",
@@ -163,21 +164,51 @@ func preRun(cmd *cobra.Command, args []string) {
 }
 
 func run(cmd *cobra.Command, args []string) {
-	scheduler = gocron.NewScheduler(time.UTC)
+	var err error
+	scheduler, err = gocron.NewScheduler(gocron.WithLocation(time.UTC))
+	defer func() { _ = scheduler.Shutdown() }()
+
+	if err != nil {
+		log.Fatalf("Failed to create scheduler: %s", err)
+	}
 
 	h := handler.NewHandler(appContext)
-	_, err := scheduler.Every(cfg.EvictionLoopInterval).Do(h.Run)
+
+	job, err := scheduler.NewJob(
+		gocron.DurationJob(
+			cfg.EvictionLoopInterval,
+		),
+		gocron.NewTask(
+			h.Run,
+		),
+	)
+
 	if err != nil {
-		log.Fatalf("Failed to start scheduler: %s", err)
+		log.Fatalf("Failed to configure scheduler's job: %s", err)
 	}
 
-	scheduler.StartAsync()
+	// each job has a unique id
+	log.Infof("Configured scheduler job with ID: %s", job.ID())
 
+	activeJobs := make([]uuid.UUID, 0)
+	for _, j := range scheduler.Jobs() {
+		activeJobs = append(activeJobs, j.ID())
+	}
+	log.Infoln("Active jobs:", activeJobs)
+
+	scheduler.Start()
+	log.Info("Scheduler started, happy shredding!")
 	select {}
 }
 
 func reset() {
 	// clear all running jobs and stop the scheduler
-	scheduler.Clear()
-	scheduler.Stop()
+	err := scheduler.StopJobs()
+	if err != nil {
+		log.Errorf("Failed to stop running jobs: %s", err)
+	}
+	err = scheduler.Shutdown()
+	if err != nil {
+		log.Errorf("Failed to shutdown scheduler: %s", err)
+	}
 }

Diff for: go.mod

@@ -1,13 +1,11 @@
 module github.com/adobe/k8s-shredder
 
-go 1.22.0
-
-toolchain go1.22.3
+go 1.22.3
 
 require (
 	github.com/fsnotify/fsnotify v1.7.0
-	github.com/go-co-op/gocron v1.37.0
 	github.com/go-co-op/gocron/v2 v2.5.0
+	github.com/google/uuid v1.6.0
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.19.1
 	github.com/prometheus/common v0.53.0
@@ -28,7 +26,7 @@ require (
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
-	github.com/evanphx/json-patch v5.6.0+incompatible // indirect
+	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
 	github.com/go-errors/errors v1.4.2 // indirect
 	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-openapi/jsonpointer v0.19.6 // indirect
@@ -39,10 +37,10 @@ require (
 	github.com/google/gnostic-models v0.6.8 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/imdario/mergo v0.3.6 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jonboulle/clockwork v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
@@ -62,11 +60,9 @@ require (
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/xlab/treeprint v1.2.0 // indirect
 	go.starlark.net v0.0.0-20230525235612-a134d8f9ddca // indirect
-	go.uber.org/atomic v1.10.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/net v0.23.0 // indirect
 	golang.org/x/oauth2 v0.18.0 // indirect
@@ -88,5 +84,5 @@ require (
 	sigs.k8s.io/kustomize/api v0.13.5-0.20230601165947-6ce0bf390ce3 // indirect
 	sigs.k8s.io/kustomize/kyaml v0.14.3-0.20230601165947-6ce0bf390ce3 // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
-	sigs.k8s.io/yaml v1.4.0 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
 )