Add unit test for Uprobe in container

cmd/bpfman-agent/main.go

@@ -139,12 +139,19 @@
 		os.Exit(1)
 	}
 
+	containerGetter, err := bpfmanagent.NewRealContainerGetter(nodeName)
+	if err != nil {
+		setupLog.Error(err, "unable to create containerGetter")
+		os.Exit(1)
+	}
+
 	common := bpfmanagent.ReconcilerCommon{
 		Client:       mgr.GetClient(),
 		Scheme:       mgr.GetScheme(),
 		GrpcConn:     conn,
 		BpfmanClient: gobpfman.NewBpfmanClient(conn),
 		NodeName:     nodeName,
+		Containers:   containerGetter,
 	}
 
 	if err = (&bpfmanagent.XdpProgramReconciler{

controllers/bpfman-agent/common.go

@@ -80,6 +80,7 @@ type ReconcilerCommon struct {
 	finalizer    string
 	recType      string
 	appOwner     metav1.Object // Set if the owner is an application
+	Containers   ContainerGetter
 }
 
 // bpfmanReconciler defines a generic bpfProgram K8s object reconciler which can

controllers/bpfman-agent/containers.go

@@ -32,21 +32,46 @@
 	"github.com/go-logr/logr"
 )
 
-// Figure out the list of container pids in which the program should be
-// attached.
-func getContainers(
-	ctx context.Context,
-	containerSelector *bpfmaniov1alpha1.ContainerSelector,
-	nodeName string,
-	logger logr.Logger) (*[]containerInfo, error) {
+type ContainerInfo struct {
+	podName       string
+	containerName string
+	pid           int64
+}
 
+// Create an interface for getting the list of containers in which the program
+// should be attached so we can mock it in unit tests.
+type ContainerGetter interface {
+	// Get the list of containers on this node that match the containerSelector.
+	GetContainers(ctx context.Context, containerSelector *bpfmaniov1alpha1.ContainerSelector,
+		logger logr.Logger) (*[]ContainerInfo, error)
+}
+
+type RealContainerGetter struct {
+	nodeName  string
+	clientSet kubernetes.Interface
+}
+
+func NewRealContainerGetter(nodeName string) (*RealContainerGetter, error) {
 	clientSet, err := getClientset()
 	if err != nil {
 		return nil, fmt.Errorf("failed to get clientset: %v", err)
 	}
 
+	containerGetter := RealContainerGetter{
+		nodeName:  nodeName,
+		clientSet: clientSet,
+	}
+
+	return &containerGetter, nil
+}
+
+func (c *RealContainerGetter) GetContainers(
+	ctx context.Context,
+	containerSelector *bpfmaniov1alpha1.ContainerSelector,
+	logger logr.Logger) (*[]ContainerInfo, error) {
+
 	// Get the list of pods that match the selector.
-	podList, err := getPodsForNode(ctx, clientSet, containerSelector, nodeName)
+	podList, err := c.getPodsForNode(ctx, containerSelector)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get pod list: %v", err)
 	}
@@ -64,8 +89,8 @@
 
 // getPodsForNode returns a list of pods on the given node that match the given
 // container selector.
-func getPodsForNode(ctx context.Context, clientset kubernetes.Interface,
-	containerSelector *bpfmaniov1alpha1.ContainerSelector, nodeName string) (*v1.PodList, error) {
+func (c *RealContainerGetter) getPodsForNode(ctx context.Context,
+	containerSelector *bpfmaniov1alpha1.ContainerSelector) (*v1.PodList, error) {
 
 	selectorString := metav1.FormatLabelSelector(&containerSelector.Pods)
 
@@ -74,33 +99,27 @@
 	}
 
 	listOptions := metav1.ListOptions{
-		FieldSelector: "spec.nodeName=" + nodeName,
+		FieldSelector: "spec.nodeName=" + c.nodeName,
 	}
 
 	if selectorString != "<none>" {
 		listOptions.LabelSelector = selectorString
 	}
 
-	podList, err := clientset.CoreV1().Pods(containerSelector.Namespace).List(ctx, listOptions)
+	podList, err := c.clientSet.CoreV1().Pods(containerSelector.Namespace).List(ctx, listOptions)
 	if err != nil {
 		return nil, fmt.Errorf("error getting pod list: %v", err)
 	}
 
 	return podList, nil
 }
 
-type containerInfo struct {
-	podName       string
-	containerName string
-	pid           int64
-}
-
 // getContainerInfo returns a list of containerInfo for the given pod list and container names.
-func getContainerInfo(podList *v1.PodList, containerNames *[]string, logger logr.Logger) (*[]containerInfo, error) {
+func getContainerInfo(podList *v1.PodList, containerNames *[]string, logger logr.Logger) (*[]ContainerInfo, error) {
 
 	crictl := "/usr/local/bin/crictl"
 
-	containers := []containerInfo{}
+	containers := []ContainerInfo{}
 
 	for i, pod := range podList.Items {
 		logger.V(1).Info("Pod", "index", i, "Name", pod.Name, "Namespace", pod.Namespace, "NodeName", pod.Spec.NodeName)
@@ -196,7 +215,7 @@
 				continue
 			}
 
-			container := containerInfo{
+			container := ContainerInfo{
 				podName:       pod.Name,
 				containerName: containerName,
 				pid:           containerPid,

controllers/bpfman-agent/tc-program.go

@@ -183,7 +183,7 @@
 
 		// There is a container selector, so see if there are any matching
 		// containers on this node.
-		containerInfo, err := getContainers(ctx, r.currentTcProgram.Spec.Containers, r.NodeName, r.Logger)
+		containerInfo, err := r.Containers.GetContainers(ctx, r.currentTcProgram.Spec.Containers, r.Logger)
 		if err != nil {
 			return nil, fmt.Errorf("failed to get container pids: %v", err)
 		}

controllers/bpfman-agent/tcx-program.go

@@ -149,7 +149,7 @@
 
 		// There is a container selector, so see if there are any matching
 		// containers on this node.
-		containerInfo, err := getContainers(ctx, r.currentTcxProgram.Spec.Containers, r.NodeName, r.Logger)
+		containerInfo, err := r.Containers.GetContainers(ctx, r.currentTcxProgram.Spec.Containers, r.Logger)
 		if err != nil {
 			return nil, fmt.Errorf("failed to get container pids: %v", err)
 		}

controllers/bpfman-agent/test_common.go

@@ -0,0 +1,84 @@
+package bpfmanagent
+
+import (
+	"context"
+	"testing"
+
+	bpfmaniov1alpha1 "github.com/bpfman/bpfman-operator/apis/v1alpha1"
+	"github.com/go-logr/logr"
+
+	"github.com/stretchr/testify/require"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientGoFake "k8s.io/client-go/kubernetes/fake"
+)
+
+type FakeContainerGetter struct {
+	containerList *[]ContainerInfo
+}
+
+func (f *FakeContainerGetter) GetContainers(ctx context.Context, containerSelector *bpfmaniov1alpha1.ContainerSelector,
+	logger logr.Logger) (*[]ContainerInfo, error) {
+	return f.containerList, nil
+}
+
+func TestGetPods(t *testing.T) {
+	ctx := context.TODO()
+
+	// Create a fake clientset
+	clientset := clientGoFake.NewSimpleClientset()
+
+	// Create a ContainerSelector
+	containerSelector := &bpfmaniov1alpha1.ContainerSelector{
+		Pods: metav1.LabelSelector{
+			MatchLabels: map[string]string{
+				"app": "test",
+			},
+		},
+		Namespace: "default",
+	}
+
+	nodeName := "test-node"
+
+	// Create a Pod that matches the label selector and is on the correct node
+	pod := &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "test-pod",
+			Namespace: "default",
+			Labels: map[string]string{
+				"app": "test",
+			},
+		},
+		Spec: v1.PodSpec{
+			NodeName: nodeName,
+		},
+	}
+
+	containerGetter := RealContainerGetter{
+		nodeName:  nodeName,
+		clientSet: clientset,
+	}
+
+	// Add the Pod to the fake clientset
+	_, err := clientset.CoreV1().Pods("default").Create(ctx, pod, metav1.CreateOptions{})
+	require.NoError(t, err)
+
+	// Call getPods and check the returned PodList
+	podList, err := containerGetter.getPodsForNode(ctx, containerSelector)
+	require.NoError(t, err)
+	require.Len(t, podList.Items, 1)
+	require.Equal(t, "test-pod", podList.Items[0].Name)
+
+	// Try another selector
+	// Create a ContainerSelector
+	containerSelector = &bpfmaniov1alpha1.ContainerSelector{
+		Pods: metav1.LabelSelector{
+			MatchLabels: map[string]string{},
+		},
+	}
+
+	podList, err = containerGetter.getPodsForNode(ctx, containerSelector)
+	require.NoError(t, err)
+	require.Len(t, podList.Items, 1)
+	require.Equal(t, "test-pod", podList.Items[0].Name)
+}

controllers/bpfman-agent/uprobe-program.go

@@ -140,7 +140,7 @@ func (r *UprobeProgramReconciler) getExpectedBpfPrograms(ctx context.Context) (*
 
 		// There is a container selector, so see if there are any matching
 		// containers on this node.
-		containerInfo, err := getContainers(ctx, r.currentUprobeProgram.Spec.Containers, r.NodeName, r.Logger)
+		containerInfo, err := r.Containers.GetContainers(ctx, r.currentUprobeProgram.Spec.Containers, r.Logger)
 		if err != nil {
 			return nil, fmt.Errorf("failed to get container pids: %v", err)
 		}