Fix go lint errors (#1468)

* fix linter errors
* fix linter errors in kubectl plugin
* update PyYAML dependency in e2e tests
* declare a testVolume in volume_test

e2e/requirements.txt

@@ -1,3 +1,3 @@
 kubernetes==11.0.0
 timeout_decorator==0.4.1
-pyyaml==5.3.1
+pyyaml==5.4.1

kubectl-pg/cmd/addDb.go

@@ -71,7 +71,7 @@ func addDb(dbName string, dbOwner string, clusterName string) {
 
 	var dbOwnerExists bool
 	dbUsers := postgresql.Spec.Users
-	for key, _ := range dbUsers {
+	for key := range dbUsers {
 		if key == dbOwner {
 			dbOwnerExists = true
 		}

kubectl-pg/cmd/connect.go

@@ -23,13 +23,14 @@ THE SOFTWARE.
 package cmd
 
 import (
+	"log"
+	"os"
+	user "os/user"
+
 	"github.com/spf13/cobra"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/remotecommand"
-	"log"
-	"os"
-	user "os/user"
 )
 
 // connectCmd represents the kubectl pg connect command
@@ -80,13 +81,13 @@ kubectl pg connect -c cluster -p -u user01 -d db01
 
 func connect(clusterName string, master bool, replica string, psql bool, user string, dbName string) {
 	config := getConfig()
-	client, er := kubernetes.NewForConfig(config)
+	client, err := kubernetes.NewForConfig(config)
-	if er != nil {
+	if err != nil {
-		log.Fatal(er)
+		log.Fatal(err)
 	}
 
 	podName := getPodName(clusterName, master, replica)
-	execRequest := &rest.Request{}
+	var execRequest *rest.Request
 
 	if psql {
 		execRequest = client.CoreV1().RESTClient().Post().Resource("pods").

kubectl-pg/cmd/create.go

@@ -53,6 +53,9 @@ kubectl pg create -f cluster-manifest.yaml
 func create(fileName string) {
 	config := getConfig()
 	postgresConfig, err := PostgresqlLister.NewForConfig(config)
+	if err != nil {
+		log.Fatal(err)
+	}
 	ymlFile, err := ioutil.ReadFile(fileName)
 	if err != nil {
 		log.Fatal(err)

kubectl-pg/cmd/extVolume.go

@@ -67,7 +67,7 @@ func extVolume(increasedVolumeSize string, clusterName string) {
 	namespace := getCurrentNamespace()
 	postgresql, err := postgresConfig.Postgresqls(namespace).Get(context.TODO(), clusterName, metav1.GetOptions{})
 	if err != nil {
-		log.Fatalf("hii %v", err)
+		log.Fatal(err)
 	}
 
 	oldSize, err := resource.ParseQuantity(postgresql.Spec.Volume.Size)

kubectl-pg/cmd/scale.go

@@ -31,7 +31,6 @@ import (
 
 	"github.com/spf13/cobra"
 	PostgresqlLister "github.com/zalando/postgres-operator/pkg/generated/clientset/versioned/typed/acid.zalan.do/v1"
-	v1 "k8s.io/api/apps/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/kubernetes"
@@ -46,6 +45,9 @@ var scaleCmd = &cobra.Command{
 Scaling to 0 leads to down time.`,
 	Run: func(cmd *cobra.Command, args []string) {
 		clusterName, err := cmd.Flags().GetString("cluster")
+		if err != nil {
+			log.Fatal(err)
+		}
 		namespace, err := cmd.Flags().GetString("namespace")
 		if err != nil {
 			log.Fatal(err)
@@ -129,8 +131,7 @@ func allowedMinMaxInstances(config *rest.Config) (int32, int32) {
 		log.Fatal(err)
 	}
 
-	var operator *v1.Deployment
+	operator := getPostgresOperator(k8sClient)
-	operator = getPostgresOperator(k8sClient)
 
 	operatorContainer := operator.Spec.Template.Spec.Containers
 	var configMapName, operatorConfigName string

kubectl-pg/cmd/update.go

@@ -57,6 +57,9 @@ kubectl pg update -f cluster-manifest.yaml
 func updatePgResources(fileName string) {
 	config := getConfig()
 	postgresConfig, err := PostgresqlLister.NewForConfig(config)
+	if err != nil {
+		log.Fatal(err)
+	}
 	ymlFile, err := ioutil.ReadFile(fileName)
 	if err != nil {
 		log.Fatal(err)

kubectl-pg/cmd/util.go

@@ -99,9 +99,9 @@ func confirmAction(clusterName string, namespace string) {
 
 func getPodName(clusterName string, master bool, replicaNumber string) string {
 	config := getConfig()
-	client, er := kubernetes.NewForConfig(config)
+	client, err := kubernetes.NewForConfig(config)
-	if er != nil {
+	if err != nil {
-		log.Fatal(er)
+		log.Fatal(err)
 	}
 
 	postgresConfig, err := PostgresqlLister.NewForConfig(config)

pkg/cluster/cluster.go

@@ -1164,7 +1164,7 @@ func (c *Cluster) initHumanUsers() error {
 	for _, superuserTeam := range superuserTeams {
 		err := c.initTeamMembers(superuserTeam, true)
 		if err != nil {
-			return fmt.Errorf("Cannot initialize members for team %q of Postgres superusers: %v", superuserTeam, err)
+			return fmt.Errorf("cannot initialize members for team %q of Postgres superusers: %v", superuserTeam, err)
 		}
 		if superuserTeam == c.Spec.TeamID {
 			clusterIsOwnedBySuperuserTeam = true
@@ -1177,7 +1177,7 @@ func (c *Cluster) initHumanUsers() error {
 			if !(util.SliceContains(superuserTeams, additionalTeam)) {
 				err := c.initTeamMembers(additionalTeam, false)
 				if err != nil {
-					return fmt.Errorf("Cannot initialize members for additional team %q for cluster owned by %q: %v", additionalTeam, c.Spec.TeamID, err)
+					return fmt.Errorf("cannot initialize members for additional team %q for cluster owned by %q: %v", additionalTeam, c.Spec.TeamID, err)
 				}
 			}
 		}
@@ -1190,7 +1190,7 @@ func (c *Cluster) initHumanUsers() error {
 
 	err := c.initTeamMembers(c.Spec.TeamID, false)
 	if err != nil {
-		return fmt.Errorf("Cannot initialize members for team %q who owns the Postgres cluster: %v", c.Spec.TeamID, err)
+		return fmt.Errorf("cannot initialize members for team %q who owns the Postgres cluster: %v", c.Spec.TeamID, err)
 	}
 
 	return nil

pkg/cluster/connection_pooler.go

@@ -420,9 +420,7 @@ func (c *Cluster) deleteConnectionPooler(role PostgresRole) (err error) {
 
 	// Clean up the deployment object. If deployment resource we've remembered
 	// is somehow empty, try to delete based on what would we generate
-	var deployment *appsv1.Deployment
+	deployment := c.ConnectionPooler[role].Deployment
-	deployment = c.ConnectionPooler[role].Deployment
-
 	policy := metav1.DeletePropagationForeground
 	options := metav1.DeleteOptions{PropagationPolicy: &policy}
 
@@ -445,8 +443,7 @@ func (c *Cluster) deleteConnectionPooler(role PostgresRole) (err error) {
 	}
 
 	// Repeat the same for the service object
-	var service *v1.Service
+	service := c.ConnectionPooler[role].Service
-	service = c.ConnectionPooler[role].Service
 	if service == nil {
 		c.logger.Debugf("no connection pooler service object to delete")
 	} else {

pkg/cluster/k8sres.go

@@ -213,10 +213,10 @@ PatroniInitDBParams:
 	for _, k := range initdbOptionNames {
 		v := patroni.InitDB[k]
 		for i, defaultParam := range config.Bootstrap.Initdb {
-			switch defaultParam.(type) {
+			switch t := defaultParam.(type) {
 			case map[string]string:
 				{
-					for k1 := range defaultParam.(map[string]string) {
+					for k1 := range t {
 						if k1 == k {
 							(config.Bootstrap.Initdb[i]).(map[string]string)[k] = v
 							continue PatroniInitDBParams
@@ -226,7 +226,7 @@ PatroniInitDBParams:
 			case string:
 				{
 					/* if the option already occurs in the list */
-					if defaultParam.(string) == v {
+					if t == v {
 						continue PatroniInitDBParams
 					}
 				}
@@ -264,7 +264,7 @@ PatroniInitDBParams:
 	if patroni.SynchronousMode {
 		config.Bootstrap.DCS.SynchronousMode = patroni.SynchronousMode
 	}
-	if patroni.SynchronousModeStrict != false {
+	if patroni.SynchronousModeStrict {
 		config.Bootstrap.DCS.SynchronousModeStrict = patroni.SynchronousModeStrict
 	}
 
@@ -336,7 +336,7 @@ func nodeAffinity(nodeReadinessLabel map[string]string, nodeAffinity *v1.NodeAff
 	if len(nodeReadinessLabel) == 0 && nodeAffinity == nil {
 		return nil
 	}
-	nodeAffinityCopy := *&v1.NodeAffinity{}
+	nodeAffinityCopy := v1.NodeAffinity{}
 	if nodeAffinity != nil {
 		nodeAffinityCopy = *nodeAffinity.DeepCopy()
 	}
@@ -1279,15 +1279,12 @@ func (c *Cluster) generateStatefulSet(spec *acidv1.PostgresSpec) (*appsv1.Statef
 		return nil, fmt.Errorf("could not set the pod management policy to the unknown value: %v", c.OpConfig.PodManagementPolicy)
 	}
 
-	stsAnnotations := make(map[string]string)
-	stsAnnotations = c.AnnotationsToPropagate(c.annotationsSet(nil))
-
 	statefulSet := &appsv1.StatefulSet{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:        c.statefulSetName(),
 			Namespace:   c.Namespace,
 			Labels:      c.labelsSet(true),
-			Annotations: stsAnnotations,
+			Annotations: c.AnnotationsToPropagate(c.annotationsSet(nil)),
 		},
 		Spec: appsv1.StatefulSetSpec{
 			Replicas:             &numberOfInstances,

pkg/cluster/k8sres_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	acidv1 "github.com/zalando/postgres-operator/pkg/apis/acid.zalan.do/v1"
+	fakeacidv1 "github.com/zalando/postgres-operator/pkg/generated/clientset/versioned/fake"
 	"github.com/zalando/postgres-operator/pkg/spec"
 	"github.com/zalando/postgres-operator/pkg/util"
 	"github.com/zalando/postgres-operator/pkg/util/config"
@@ -24,9 +25,21 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/intstr"
+	"k8s.io/client-go/kubernetes/fake"
 	v1core "k8s.io/client-go/kubernetes/typed/core/v1"
 )
 
+func newFakeK8sTestClient() (k8sutil.KubernetesClient, *fake.Clientset) {
+	acidClientSet := fakeacidv1.NewSimpleClientset()
+	clientSet := fake.NewSimpleClientset()
+
+	return k8sutil.KubernetesClient{
+		PodsGetter:         clientSet.CoreV1(),
+		PostgresqlsGetter:  acidClientSet.AcidV1(),
+		StatefulSetsGetter: clientSet.AppsV1(),
+	}, clientSet
+}
+
 // For testing purposes
 type ExpectedValue struct {
 	envIndex       int
@@ -930,15 +943,6 @@ func TestNodeAffinity(t *testing.T) {
 	assert.Equal(t, s.Spec.Template.Spec.Affinity.NodeAffinity, nodeAff, "cluster template has correct node affinity")
 }
 
-func testCustomPodTemplate(cluster *Cluster, podSpec *v1.PodTemplateSpec) error {
-	if podSpec.ObjectMeta.Name != "test-pod-template" {
-		return fmt.Errorf("Custom pod template is not used, current spec %+v",
-			podSpec)
-	}
-
-	return nil
-}
-
 func testDeploymentOwnerReference(cluster *Cluster, deployment *appsv1.Deployment) error {
 	owner := deployment.ObjectMeta.OwnerReferences[0]
 
@@ -962,16 +966,23 @@ func testServiceOwnerReference(cluster *Cluster, service *v1.Service, role Postg
 }
 
 func TestTLS(t *testing.T) {
-	var err error
-	var spec acidv1.PostgresSpec
-	var cluster *Cluster
-	var spiloRunAsUser = int64(101)
-	var spiloRunAsGroup = int64(103)
-	var spiloFSGroup = int64(103)
-	var additionalVolumes = spec.AdditionalVolumes
 
-	makeSpec := func(tls acidv1.TLSDescription) acidv1.PostgresSpec {
+	client, _ := newFakeK8sTestClient()
-		return acidv1.PostgresSpec{
+	clusterName := "acid-test-cluster"
+	namespace := "default"
+	tlsSecretName := "my-secret"
+	spiloRunAsUser := int64(101)
+	spiloRunAsGroup := int64(103)
+	spiloFSGroup := int64(103)
+	defaultMode := int32(0640)
+	mountPath := "/tls"
+
+	pg := acidv1.Postgresql{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      clusterName,
+			Namespace: namespace,
+		},
+		Spec: acidv1.PostgresSpec{
 			TeamID: "myapp", NumberOfInstances: 1,
 			Resources: acidv1.Resources{
 				ResourceRequests: acidv1.ResourceDescription{CPU: "1", Memory: "10"},
@@ -980,11 +991,24 @@ func TestTLS(t *testing.T) {
 			Volume: acidv1.Volume{
 				Size: "1G",
 			},
-			TLS: &tls,
+			TLS: &acidv1.TLSDescription{
-		}
+				SecretName: tlsSecretName, CAFile: "ca.crt"},
+			AdditionalVolumes: []acidv1.AdditionalVolume{
+				acidv1.AdditionalVolume{
+					Name:      tlsSecretName,
+					MountPath: mountPath,
+					VolumeSource: v1.VolumeSource{
+						Secret: &v1.SecretVolumeSource{
+							SecretName:  tlsSecretName,
+							DefaultMode: &defaultMode,
+						},
+					},
+				},
+			},
+		},
 	}
 
-	cluster = New(
+	var cluster = New(
 		Config{
 			OpConfig: config.Config{
 				PodManagementPolicy: "ordered_ready",
@@ -999,28 +1023,14 @@ func TestTLS(t *testing.T) {
 					SpiloFSGroup:    &spiloFSGroup,
 				},
 			},
-		}, k8sutil.KubernetesClient{}, acidv1.Postgresql{}, logger, eventRecorder)
+		}, client, pg, logger, eventRecorder)
-	spec = makeSpec(acidv1.TLSDescription{SecretName: "my-secret", CAFile: "ca.crt"})
+
-	s, err := cluster.generateStatefulSet(&spec)
+	// create a statefulset
-	if err != nil {
+	sts, err := cluster.createStatefulSet()
 	assert.NoError(t, err)
-	}
 
 	fsGroup := int64(103)
-	assert.Equal(t, &fsGroup, s.Spec.Template.Spec.SecurityContext.FSGroup, "has a default FSGroup assigned")
+	assert.Equal(t, &fsGroup, sts.Spec.Template.Spec.SecurityContext.FSGroup, "has a default FSGroup assigned")
-
-	defaultMode := int32(0640)
-	mountPath := "/tls"
-	additionalVolumes = append(additionalVolumes, acidv1.AdditionalVolume{
-		Name:      spec.TLS.SecretName,
-		MountPath: mountPath,
-		VolumeSource: v1.VolumeSource{
-			Secret: &v1.SecretVolumeSource{
-				SecretName:  spec.TLS.SecretName,
-				DefaultMode: &defaultMode,
-			},
-		},
-	})
 
 	volume := v1.Volume{
 		Name: "my-secret",
@@ -1031,16 +1041,16 @@ func TestTLS(t *testing.T) {
 			},
 		},
 	}
-	assert.Contains(t, s.Spec.Template.Spec.Volumes, volume, "the pod gets a secret volume")
+	assert.Contains(t, sts.Spec.Template.Spec.Volumes, volume, "the pod gets a secret volume")
 
-	assert.Contains(t, s.Spec.Template.Spec.Containers[0].VolumeMounts, v1.VolumeMount{
+	assert.Contains(t, sts.Spec.Template.Spec.Containers[0].VolumeMounts, v1.VolumeMount{
 		MountPath: "/tls",
 		Name:      "my-secret",
 	}, "the volume gets mounted in /tls")
 
-	assert.Contains(t, s.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "SSL_CERTIFICATE_FILE", Value: "/tls/tls.crt"})
+	assert.Contains(t, sts.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "SSL_CERTIFICATE_FILE", Value: "/tls/tls.crt"})
-	assert.Contains(t, s.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "SSL_PRIVATE_KEY_FILE", Value: "/tls/tls.key"})
+	assert.Contains(t, sts.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "SSL_PRIVATE_KEY_FILE", Value: "/tls/tls.key"})
-	assert.Contains(t, s.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "SSL_CA_FILE", Value: "/tls/ca.crt"})
+	assert.Contains(t, sts.Spec.Template.Spec.Containers[0].Env, v1.EnvVar{Name: "SSL_CA_FILE", Value: "/tls/ca.crt"})
 }
 
 func TestAdditionalVolume(t *testing.T) {

pkg/cluster/majorversionupgrade.go

@@ -19,8 +19,8 @@ var VersionMap = map[string]int{
 
 // IsBiggerPostgresVersion Compare two Postgres version numbers
 func IsBiggerPostgresVersion(old string, new string) bool {
-	oldN, _ := VersionMap[old]
+	oldN := VersionMap[old]
-	newN, _ := VersionMap[new]
+	newN := VersionMap[new]
 	return newN > oldN
 }
 

pkg/cluster/sync.go

@@ -11,7 +11,6 @@ import (
 	"github.com/zalando/postgres-operator/pkg/util"
 	"github.com/zalando/postgres-operator/pkg/util/constants"
 	"github.com/zalando/postgres-operator/pkg/util/k8sutil"
-	appsv1 "k8s.io/api/apps/v1"
 	batchv1beta1 "k8s.io/api/batch/v1beta1"
 	v1 "k8s.io/api/core/v1"
 	policybeta1 "k8s.io/api/policy/v1beta1"
@@ -260,28 +259,6 @@ func (c *Cluster) syncPodDisruptionBudget(isUpdate bool) error {
 	return nil
 }
 
-func (c *Cluster) mustUpdatePodsAfterLazyUpdate(desiredSset *appsv1.StatefulSet) (bool, error) {
-
-	pods, err := c.listPods()
-	if err != nil {
-		return false, fmt.Errorf("could not list pods of the statefulset: %v", err)
-	}
-
-	for _, pod := range pods {
-
-		effectivePodImage := pod.Spec.Containers[0].Image
-		ssImage := desiredSset.Spec.Template.Spec.Containers[0].Image
-
-		if ssImage != effectivePodImage {
-			c.logger.Infof("not all pods were re-started when the lazy upgrade was enabled; forcing the rolling upgrade now")
-			return true, nil
-		}
-
-	}
-
-	return false, nil
-}
-
 func (c *Cluster) syncStatefulSet() error {
 
 	podsToRecreate := make([]v1.Pod, 0)

pkg/cluster/util.go

@@ -227,11 +227,6 @@ func (c *Cluster) logServiceChanges(role PostgresRole, old, new *v1.Service, isU
 	}
 }
 
-func (c *Cluster) logVolumeChanges(old, new acidv1.Volume) {
-	c.logger.Infof("volume specification has been changed")
-	logNiceDiff(c.logger, old, new)
-}
-
 func (c *Cluster) getTeamMembers(teamID string) ([]string, error) {
 
 	if teamID == "" {
@@ -251,9 +246,7 @@ func (c *Cluster) getTeamMembers(teamID string) ([]string, error) {
 			}
 		}
 
-		for _, member := range additionalMembers {
+		members = append(members, additionalMembers...)
-			members = append(members, member)
-		}
 	}
 
 	if !c.OpConfig.EnableTeamsAPI {
@@ -292,7 +285,6 @@ func (c *Cluster) annotationsSet(annotations map[string]string) map[string]strin
 	pgCRDAnnotations := c.ObjectMeta.Annotations
 
 	// allow to inherit certain labels from the 'postgres' object
-	if pgCRDAnnotations != nil {
 	for k, v := range pgCRDAnnotations {
 		for _, match := range c.OpConfig.InheritedAnnotations {
 			if k == match {
@@ -300,7 +292,6 @@ func (c *Cluster) annotationsSet(annotations map[string]string) map[string]strin
 			}
 		}
 	}
-	}
 
 	if len(annotations) > 0 {
 		return annotations

pkg/cluster/volumes.go

@@ -74,10 +74,15 @@ func (c *Cluster) syncVolumes() error {
 func (c *Cluster) syncUnderlyingEBSVolume() error {
 	c.logger.Infof("starting to sync EBS volumes: type, iops, throughput, and size")
 
-	var err error
+	var (
+		err     error
+		newSize resource.Quantity
+	)
 
 	targetValue := c.Spec.Volume
-	newSize, err := resource.ParseQuantity(targetValue.Size)
+	if newSize, err = resource.ParseQuantity(targetValue.Size); err != nil {
+		return fmt.Errorf("could not parse volume size: %v", err)
+	}
 	targetSize := quantityToGigabyte(newSize)
 
 	awsGp3 := aws.String("gp3")

pkg/cluster/volumes_test.go

@@ -24,6 +24,20 @@ import (
 	"k8s.io/client-go/kubernetes/fake"
 )
 
+type testVolume struct {
+	size        int64
+	iops        int64
+	throughtput int64
+	volType     string
+}
+
+var testVol = testVolume{
+	size:        100,
+	iops:        300,
+	throughtput: 125,
+	volType:     "gp2",
+}
+
 func newFakeK8sPVCclient() (k8sutil.KubernetesClient, *fake.Clientset) {
 	clientSet := fake.NewSimpleClientset()
 
@@ -189,14 +203,7 @@ func TestMigrateEBS(t *testing.T) {
 	cluster.Namespace = namespace
 	filterLabels := cluster.labelsSet(false)
 
-	testVolumes := []testVolume{
+	testVolumes := []testVolume{testVol, testVol}
-		{
-			size: 100,
-		},
-		{
-			size: 100,
-		},
-	}
 
 	initTestVolumesAndPods(cluster.KubeClient, namespace, clusterName, filterLabels, testVolumes)
 
@@ -220,13 +227,6 @@ func TestMigrateEBS(t *testing.T) {
 	cluster.executeEBSMigration()
 }
 
-type testVolume struct {
-	iops        int64
-	throughtput int64
-	size        int64
-	volType     string
-}
-
 func initTestVolumesAndPods(client k8sutil.KubernetesClient, namespace, clustername string, labels labels.Set, volumes []testVolume) {
 	i := 0
 	for _, v := range volumes {
@@ -305,17 +305,7 @@ func TestMigrateGp3Support(t *testing.T) {
 	cluster.Namespace = namespace
 	filterLabels := cluster.labelsSet(false)
 
-	testVolumes := []testVolume{
+	testVolumes := []testVolume{testVol, testVol, testVol}
-		{
-			size: 100,
-		},
-		{
-			size: 100,
-		},
-		{
-			size: 100,
-		},
-	}
 
 	initTestVolumesAndPods(cluster.KubeClient, namespace, clusterName, filterLabels, testVolumes)
 
@@ -371,14 +361,7 @@ func TestManualGp2Gp3Support(t *testing.T) {
 	cluster.Namespace = namespace
 	filterLabels := cluster.labelsSet(false)
 
-	testVolumes := []testVolume{
+	testVolumes := []testVolume{testVol, testVol}
-		{
-			size: 100,
-		},
-		{
-			size: 100,
-		},
-	}
 
 	initTestVolumesAndPods(cluster.KubeClient, namespace, clusterName, filterLabels, testVolumes)