e2e: add tests to validate metrics endpoint (#1522)

Author: camilamacedo86

test/e2e/metrics_test.go

@@ -0,0 +1,91 @@
+package e2e
+
+import (
+	"bytes"
+	"os/exec"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// nolint:gosec
+// TestOperatorControllerMetricsExportedEndpoint verifies that the metrics endpoint for the operator controller
+// is exported correctly and accessible by authorized users through RBAC and a ServiceAccount token.
+// The test performs the following steps:
+// 1. Creates a ClusterRoleBinding to grant necessary permissions for accessing metrics.
+// 2. Generates a ServiceAccount token for authentication.
+// 3. Deploys a curl pod to interact with the metrics endpoint.
+// 4. Waits for the curl pod to become ready.
+// 5. Executes a curl command from the pod to validate the metrics endpoint.
+// 6. Cleans up all resources created during the test, such as the ClusterRoleBinding and curl pod.
+func TestOperatorControllerMetricsExportedEndpoint(t *testing.T) {
+	var (
+		token     string
+		curlPod   = "curl-metrics"
+		namespace = "olmv1-system"
+	)
+
+	t.Log("Creating ClusterRoleBinding for operator controller metrics")
+	cmd := exec.Command("kubectl", "create", "clusterrolebinding", "operator-controller-metrics-binding",
+		"--clusterrole=operator-controller-metrics-reader",
+		"--serviceaccount="+namespace+":operator-controller-controller-manager")
+	output, err := cmd.CombinedOutput()
+	require.NoError(t, err, "Error creating ClusterRoleBinding: %s", string(output))
+
+	defer func() {
+		t.Log("Cleaning up ClusterRoleBinding")
+		_ = exec.Command("kubectl", "delete", "clusterrolebinding", "operator-controller-metrics-binding", "--ignore-not-found=true").Run()
+	}()
+
+	t.Log("Generating ServiceAccount token")
+	tokenCmd := exec.Command("kubectl", "create", "token", "operator-controller-controller-manager", "-n", namespace)
+	tokenOutput, err := tokenCmd.Output()
+	require.NoError(t, err, "Error creating token: %s", string(tokenOutput))
+	token = string(bytes.TrimSpace(tokenOutput))
+
+	t.Log("Creating curl pod to validate the metrics endpoint")
+	cmd = exec.Command("kubectl", "run", curlPod,
+		"--image=curlimages/curl:7.87.0", "-n", namespace,
+		"--restart=Never",
+		"--overrides", `{
+			"spec": {
+				"containers": [{
+					"name": "curl",
+					"image": "curlimages/curl:7.87.0",
+					"command": ["sh", "-c", "sleep 3600"],
+					"securityContext": {
+						"allowPrivilegeEscalation": false,
+						"capabilities": {
+							"drop": ["ALL"]
+						},
+						"runAsNonRoot": true,
+						"runAsUser": 1000,
+						"seccompProfile": {
+							"type": "RuntimeDefault"
+						}
+					}
+				}],
+				"serviceAccountName": "operator-controller-controller-manager"
+			}
+		}`)
+	output, err = cmd.CombinedOutput()
+	require.NoError(t, err, "Error creating curl pod: %s", string(output))
+
+	defer func() {
+		t.Log("Cleaning up curl pod")
+		_ = exec.Command("kubectl", "delete", "pod", curlPod, "-n", namespace, "--ignore-not-found=true").Run()
+	}()
+
+	t.Log("Waiting for the curl pod to be ready")
+	waitCmd := exec.Command("kubectl", "wait", "--for=condition=Ready", "pod", curlPod, "-n", namespace, "--timeout=60s")
+	waitOutput, waitErr := waitCmd.CombinedOutput()
+	require.NoError(t, waitErr, "Error waiting for curl pod to be ready: %s", string(waitOutput))
+
+	t.Log("Validating the metrics endpoint")
+	metricsURL := "https://operator-controller-controller-manager-metrics-service." + namespace + ".svc.cluster.local:8443/metrics"
+	curlCmd := exec.Command("kubectl", "exec", curlPod, "-n", namespace, "--",
+		"curl", "-v", "-k", "-H", "Authorization: Bearer "+token, metricsURL)
+	output, err = curlCmd.CombinedOutput()
+	require.NoError(t, err, "Error calling metrics endpoint: %s", string(output))
+	require.Contains(t, string(output), "200 OK", "Metrics endpoint did not return 200 OK")
+}