feat: introduce StatefulSet analyser.

Signed-off-by: Aris Boutselis <aris.boutselis@senseon.io>

pkg/analyzer/analyzer.go

@@ -10,6 +10,7 @@ var coreAnalyzerMap = map[string]IAnalyzer{
 	"PersistentVolumeClaim": PvcAnalyzer{},
 	"Service":               ServiceAnalyzer{},
 	"Ingress":               IngressAnalyzer{},
+	"StatefulSet":           StatefulSetAnalyzer{},
 }
 
 var additionalAnalyzerMap = map[string]IAnalyzer{

pkg/analyzer/statefulset.go

@@ -0,0 +1,49 @@
+package analyzer
+
+import (
+	"fmt"
+
+	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type StatefulSetAnalyzer struct{}
+
+func (StatefulSetAnalyzer) Analyze(a Analyzer) ([]Result, error) {
+	list, err := a.Client.GetClient().AppsV1().StatefulSets(a.Namespace).List(a.Context, metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	var preAnalysis = map[string]PreAnalysis{}
+
+	for _, sts := range list.Items {
+		var failures []string
+
+		// get serviceName
+		serviceName := sts.Spec.ServiceName
+		_, err := a.Client.GetClient().CoreV1().Services(sts.Namespace).Get(a.Context, serviceName, metav1.GetOptions{})
+		if err != nil {
+			failures = append(failures, fmt.Sprintf("StatefulSet uses the service %s/%s which does not exist.", sts.Namespace, serviceName))
+		}
+		if len(failures) > 0 {
+			preAnalysis[fmt.Sprintf("%s/%s", sts.Namespace, sts.Name)] = PreAnalysis{
+				StatefulSet:    sts,
+				FailureDetails: failures,
+			}
+		}
+	}
+
+	for key, value := range preAnalysis {
+		var currentAnalysis = Result{
+			Kind:  "StatefulSet",
+			Name:  key,
+			Error: value.FailureDetails,
+		}
+
+		parent, _ := util.GetParent(a.Client, value.StatefulSet.ObjectMeta)
+		currentAnalysis.ParentObject = parent
+		a.Results = append(a.Results, currentAnalysis)
+	}
+
+	return a.Results, nil
+}

pkg/analyzer/statefulset_test.go

@@ -0,0 +1,78 @@
+package analyzer
+
+import (
+	"context"
+	"testing"
+
+	"github.com/k8sgpt-ai/k8sgpt/pkg/kubernetes"
+	"github.com/magiconair/properties/assert"
+	appsv1 "k8s.io/api/apps/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes/fake"
+)
+
+func TestStatefulSetAnalyzer(t *testing.T) {
+	clientset := fake.NewSimpleClientset(
+		&appsv1.StatefulSet{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      "example",
+				Namespace: "default",
+			},
+		})
+	statefulSetAnalyzer := StatefulSetAnalyzer{}
+
+	config := Analyzer{
+		Client: &kubernetes.Client{
+			Client: clientset,
+		},
+		Context:   context.Background(),
+		Namespace: "default",
+	}
+	analysisResults, err := statefulSetAnalyzer.Analyze(config)
+	if err != nil {
+		t.Error(err)
+	}
+	assert.Equal(t, len(analysisResults), 1)
+}
+
+func TestStatefulSetAnalyzerWithoutService(t *testing.T) {
+	clientset := fake.NewSimpleClientset(
+		&appsv1.StatefulSet{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      "example",
+				Namespace: "default",
+			},
+			Spec: appsv1.StatefulSetSpec{
+				ServiceName: "example-svc",
+			},
+		})
+	statefulSetAnalyzer := StatefulSetAnalyzer{}
+
+	config := Analyzer{
+		Client: &kubernetes.Client{
+			Client: clientset,
+		},
+		Context:   context.Background(),
+		Namespace: "default",
+	}
+	analysisResults, err := statefulSetAnalyzer.Analyze(config)
+	if err != nil {
+		t.Error(err)
+	}
+	var errorFound bool
+	want := "StatefulSet uses the service default/example-svc which does not exist."
+
+	for _, analysis := range analysisResults {
+		for _, got := range analysis.Error {
+			if want == got {
+				errorFound = true
+			}
+		}
+		if errorFound {
+			break
+		}
+	}
+	if !errorFound {
+		t.Errorf("Error expected: '%v', not found in StatefulSet's analysis results", want)
+	}
+}

pkg/analyzer/types.go

@@ -29,6 +29,7 @@ type PreAnalysis struct {
 	Ingress                  networkv1.Ingress
 	HorizontalPodAutoscalers autov1.HorizontalPodAutoscaler
 	PodDisruptionBudget      policyv1.PodDisruptionBudget
+	StatefulSet              appsv1.StatefulSet
 }
 
 type Result struct {