feat: add node analyzer (k8sgpt-ai#272)

Signed-off-by: Dominik Augustin <dom.augustin@gmx.at>

README.md

@@ -143,6 +143,7 @@ you will be able to write your own analyzers.
 - [x] statefulSetAnalyzer
 - [x] deploymentAnalyzer
 - [x] cronJobAnalyzer
+- [x] nodeAnalyzer
 
 #### Optional
 

pkg/analyzer/analyzer.go

@@ -18,6 +18,7 @@ var coreAnalyzerMap = map[string]common.IAnalyzer{
 	"Ingress":               IngressAnalyzer{},
 	"StatefulSet":           StatefulSetAnalyzer{},
 	"CronJob":               CronJobAnalyzer{},
+	"Node":                  NodeAnalyzer{},
 }
 
 var additionalAnalyzerMap = map[string]common.IAnalyzer{

pkg/analyzer/node.go

@@ -0,0 +1,74 @@
+package analyzer
+
+import (
+	"fmt"
+	v1 "k8s.io/api/core/v1"
+
+	"github.com/k8sgpt-ai/k8sgpt/pkg/common"
+	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type NodeAnalyzer struct{}
+
+func (NodeAnalyzer) Analyze(a common.Analyzer) ([]common.Result, error) {
+
+	list, err := a.Client.GetClient().CoreV1().Nodes().List(a.Context, metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	var preAnalysis = map[string]common.PreAnalysis{}
+
+	for _, node := range list.Items {
+		var failures []common.Failure
+		for _, nodeCondition := range node.Status.Conditions {
+			// https://kubernetes.io/docs/concepts/architecture/nodes/#condition
+			switch nodeCondition.Type {
+			case v1.NodeReady:
+				if nodeCondition.Status == v1.ConditionTrue {
+					break
+				}
+				failures = addNodeConditionFailure(failures, node.Name, nodeCondition)
+			default:
+				if nodeCondition.Status != v1.ConditionFalse {
+					failures = addNodeConditionFailure(failures, node.Name, nodeCondition)
+				}
+			}
+		}
+
+		if len(failures) > 0 {
+			preAnalysis[fmt.Sprintf("%s", node.Name)] = common.PreAnalysis{
+				Node:           node,
+				FailureDetails: failures,
+			}
+		}
+	}
+
+	for key, value := range preAnalysis {
+		var currentAnalysis = common.Result{
+			Kind:  "Node",
+			Name:  key,
+			Error: value.FailureDetails,
+		}
+
+		parent, _ := util.GetParent(a.Client, value.Node.ObjectMeta)
+		currentAnalysis.ParentObject = parent
+		a.Results = append(a.Results, currentAnalysis)
+	}
+
+	return a.Results, err
+}
+
+func addNodeConditionFailure(failures []common.Failure, nodeName string, nodeCondition v1.NodeCondition) []common.Failure {
+	failures = append(failures, common.Failure{
+		Text: fmt.Sprintf("%s has condition of type %s, reason %s: %s", nodeName, nodeCondition.Type, nodeCondition.Reason, nodeCondition.Message),
+		Sensitive: []common.Sensitive{
+			{
+				Unmasked: nodeName,
+				Masked:   util.MaskString(nodeName),
+			},
+		},
+	})
+	return failures
+}

pkg/analyzer/node_test.go

@@ -0,0 +1,111 @@
+package analyzer
+
+import (
+	"context"
+	"testing"
+
+	"github.com/k8sgpt-ai/k8sgpt/pkg/common"
+	"github.com/k8sgpt-ai/k8sgpt/pkg/kubernetes"
+	"github.com/magiconair/properties/assert"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes/fake"
+)
+
+func TestNodeAnalyzerNodeReady(t *testing.T) {
+	clientset := fake.NewSimpleClientset(&v1.Node{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "node1",
+		},
+		Status: v1.NodeStatus{
+			Conditions: []v1.NodeCondition{
+				{
+					Type:    v1.NodeReady,
+					Status:  v1.ConditionTrue,
+					Reason:  "KubeletReady",
+					Message: "kubelet is posting ready status",
+				},
+			},
+		},
+	})
+
+	config := common.Analyzer{
+		Client: &kubernetes.Client{
+			Client: clientset,
+		},
+		Context: context.Background(),
+	}
+	nodeAnalyzer := NodeAnalyzer{}
+	var analysisResults []common.Result
+	analysisResults, err := nodeAnalyzer.Analyze(config)
+	if err != nil {
+		t.Error(err)
+	}
+	assert.Equal(t, len(analysisResults), 0)
+}
+
+func TestNodeAnalyzerNodeDiskPressure(t *testing.T) {
+	clientset := fake.NewSimpleClientset(&v1.Node{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "node1",
+		},
+		Status: v1.NodeStatus{
+			Conditions: []v1.NodeCondition{
+				{
+					Type:    v1.NodeDiskPressure,
+					Status:  v1.ConditionTrue,
+					Reason:  "KubeletHasDiskPressure",
+					Message: "kubelet has disk pressure",
+				},
+			},
+		},
+	})
+
+	config := common.Analyzer{
+		Client: &kubernetes.Client{
+			Client: clientset,
+		},
+		Context: context.Background(),
+	}
+	nodeAnalyzer := NodeAnalyzer{}
+	var analysisResults []common.Result
+	analysisResults, err := nodeAnalyzer.Analyze(config)
+	if err != nil {
+		t.Error(err)
+	}
+	assert.Equal(t, len(analysisResults), 1)
+}
+
+// A cloud provider may set their own condition and/or a new status might be introduced
+// In such cases a failure is assumed and the code shouldn't break, although it might be a false positive
+func TestNodeAnalyzerNodeUnknownType(t *testing.T) {
+	clientset := fake.NewSimpleClientset(&v1.Node{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "node1",
+		},
+		Status: v1.NodeStatus{
+			Conditions: []v1.NodeCondition{
+				{
+					Type:    "UnknownNodeConditionType",
+					Status:  "CompletelyUnknown",
+					Reason:  "KubeletHasTheUnknown",
+					Message: "kubelet has the unknown",
+				},
+			},
+		},
+	})
+
+	config := common.Analyzer{
+		Client: &kubernetes.Client{
+			Client: clientset,
+		},
+		Context: context.Background(),
+	}
+	nodeAnalyzer := NodeAnalyzer{}
+	var analysisResults []common.Result
+	analysisResults, err := nodeAnalyzer.Analyze(config)
+	if err != nil {
+		t.Error(err)
+	}
+	assert.Equal(t, len(analysisResults), 1)
+}

pkg/common/types.go

@@ -38,6 +38,7 @@ type PreAnalysis struct {
 	PodDisruptionBudget      policyv1.PodDisruptionBudget
 	StatefulSet              appsv1.StatefulSet
 	NetworkPolicy            networkv1.NetworkPolicy
+	Node                     v1.Node
 	// Integrations
 	TrivyVulnerabilityReport trivy.VulnerabilityReport
 }