feat: Allow usage of namedPorts for sidecar containers (#4237)

Signed-off-by: heshamelsherif97 <heshamelsherif97@gmail.com>

Author: heshamelsherif97

pkg/k8s/pod_info.go

@@ -2,6 +2,7 @@ package k8s
 
 import (
 	"encoding/json"
+
 	"github.com/pkg/errors"
 	corev1 "k8s.io/api/core/v1"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -97,6 +98,12 @@ func buildPodInfo(pod *corev1.Pod) PodInfo {
 	for _, podContainer := range pod.Spec.Containers {
 		containerPorts = append(containerPorts, podContainer.Ports...)
 	}
+	// also support sidecar container (initContainer with restartPolicy=Always)
+	for _, podContainer := range pod.Spec.InitContainers {
+		if podContainer.RestartPolicy != nil && *podContainer.RestartPolicy == corev1.ContainerRestartPolicyAlways {
+			containerPorts = append(containerPorts, podContainer.Ports...)
+		}
+	}
 	return PodInfo{
 		Key: podKey,
 		UID: pod.UID,

pkg/k8s/pod_info_test.go

@@ -2,13 +2,14 @@ package k8s
 
 import (
 	"errors"
+	"testing"
+	"time"
+
 	"github.com/stretchr/testify/assert"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/intstr"
-	"testing"
-	"time"
 )
 
 func TestPodInfo_HasAnyOfReadinessGates(t *testing.T) {
@@ -317,6 +318,8 @@ func Test_buildPodInfo(t *testing.T) {
 
 	timeNow := time.Now()
 
+	initContainerRestartPolicyAlways := corev1.ContainerRestartPolicyAlways
+
 	tests := []struct {
 		name string
 		args args
@@ -358,6 +361,29 @@ func Test_buildPodInfo(t *testing.T) {
 								},
 							},
 						},
+						InitContainers: []corev1.Container{
+							{
+								RestartPolicy: &initContainerRestartPolicyAlways,
+								Ports: []corev1.ContainerPort{
+									{
+										Name:          "dns",
+										ContainerPort: 53,
+									},
+									{
+										Name:          "ftp",
+										ContainerPort: 21,
+									},
+								},
+							},
+							{
+								Ports: []corev1.ContainerPort{
+									{
+										Name:          "smtp",
+										ContainerPort: 25,
+									},
+								},
+							},
+						},
 						ReadinessGates: []corev1.PodReadinessGate{
 							{
 								ConditionType: "ingress.k8s.aws/cond-1",
@@ -398,6 +424,14 @@ func Test_buildPodInfo(t *testing.T) {
 						Name:          "https",
 						ContainerPort: 8443,
 					},
+					{
+						Name:          "dns",
+						ContainerPort: 53,
+					},
+					{
+						Name:          "ftp",
+						ContainerPort: 21,
+					},
 				},
 				ReadinessGates: []corev1.PodReadinessGate{
 					{
@@ -461,6 +495,29 @@ func Test_buildPodInfo(t *testing.T) {
 								},
 							},
 						},
+						InitContainers: []corev1.Container{
+							{
+								RestartPolicy: &initContainerRestartPolicyAlways,
+								Ports: []corev1.ContainerPort{
+									{
+										Name:          "dns",
+										ContainerPort: 53,
+									},
+									{
+										Name:          "ftp",
+										ContainerPort: 21,
+									},
+								},
+							},
+							{
+								Ports: []corev1.ContainerPort{
+									{
+										Name:          "smtp",
+										ContainerPort: 25,
+									},
+								},
+							},
+						},
 						ReadinessGates: []corev1.PodReadinessGate{
 							{
 								ConditionType: "ingress.k8s.aws/cond-1",
@@ -501,6 +558,14 @@ func Test_buildPodInfo(t *testing.T) {
 						Name:          "https",
 						ContainerPort: 8443,
 					},
+					{
+						Name:          "dns",
+						ContainerPort: 53,
+					},
+					{
+						Name:          "ftp",
+						ContainerPort: 21,
+					},
 				},
 				ReadinessGates: []corev1.PodReadinessGate{
 					{

pkg/k8s/pod_utils.go

@@ -53,6 +53,16 @@ func LookupContainerPort(pod *corev1.Pod, port intstr.IntOrString) (int64, error
 				}
 			}
 		}
+		// also support sidecar container (initContainer with restartPolicy=Always)
+		for _, podContainer := range pod.Spec.InitContainers {
+			if podContainer.RestartPolicy != nil && *podContainer.RestartPolicy == corev1.ContainerRestartPolicyAlways {
+				for _, podPort := range podContainer.Ports {
+					if podPort.Name == port.StrVal {
+						return int64(podPort.ContainerPort), nil
+					}
+				}
+			}
+		}
 	case intstr.Int:
 		return int64(port.IntVal), nil
 	}

pkg/k8s/pod_utils_test.go

@@ -1,12 +1,13 @@
 package k8s
 
 import (
+	"testing"
+
 	"github.com/pkg/errors"
 	"github.com/stretchr/testify/assert"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/intstr"
-	"testing"
 )
 
 func TestIsPodHasReadinessGate(t *testing.T) {
@@ -178,6 +179,7 @@ func TestGetPodCondition(t *testing.T) {
 }
 
 func TestLookupContainerPort(t *testing.T) {
+	initContainerRestartPolicyAlways := corev1.ContainerRestartPolicyAlways
 	pod := &corev1.Pod{
 		ObjectMeta: metav1.ObjectMeta{
 			Namespace: "ns",
@@ -205,6 +207,28 @@ func TestLookupContainerPort(t *testing.T) {
 					},
 				},
 			},
+			InitContainers: []corev1.Container{
+				{
+					RestartPolicy: &initContainerRestartPolicyAlways,
+					Ports: []corev1.ContainerPort{
+						{
+							ContainerPort: 53,
+						},
+						{
+							Name:          "ftp",
+							ContainerPort: 21,
+						},
+					},
+				},
+				{
+					Ports: []corev1.ContainerPort{
+						{
+							Name:          "smtp",
+							ContainerPort: 25,
+						},
+					},
+				},
+			},
 		},
 	}
 	type args struct {
@@ -233,6 +257,14 @@ func TestLookupContainerPort(t *testing.T) {
 			},
 			want: 80,
 		},
+		{
+			name: "named pod within pod spec (as an initContainer (sidecar)) can be found",
+			args: args{
+				pod:  pod,
+				port: intstr.FromString("ftp"),
+			},
+			want: 21,
+		},
 		{
 			name: "named pod within pod spec cannot be found",
 			args: args{
@@ -241,6 +273,14 @@ func TestLookupContainerPort(t *testing.T) {
 			},
 			wantErr: errors.New("unable to find port https on pod ns/default"),
 		},
+		{
+			name: "named pod within initContainer that is not a sidecar cannot be found",
+			args: args{
+				pod:  pod,
+				port: intstr.FromString("smtp"),
+			},
+			wantErr: errors.New("unable to find port smtp on pod ns/default"),
+		},
 		{
 			name: "numerical pod within pod spec can be found",
 			args: args{
@@ -249,6 +289,14 @@ func TestLookupContainerPort(t *testing.T) {
 			},
 			want: 9999,
 		},
+		{
+			name: "numerical pod within pod spec (as an initContainer (sidecar)) can be found",
+			args: args{
+				pod:  pod,
+				port: intstr.FromInt(53),
+			},
+			want: 53,
+		},
 		{
 			name: "numerical pod not within pod spec should still be found",
 			args: args{