refactor parseEndpoint to accept pod names with '.' in it

kubernetes allows us to create pod with '.' in between, we should
not limit parsing such endpoints

Signed-off-by: Rewant Soni <resoni@redhat.com>

internal/controller/csiaddons/csiaddonsnode_controller.go

@@ -211,10 +211,6 @@ func (r *CSIAddonsNodeReconciler) resolveEndpoint(ctx context.Context, rawURL st
 		return rawURL, nil
 	} else if err != nil {
 		return "", err
-	} else if namespace == "" {
-		return "", fmt.Errorf("failed to get namespace from endpoint %q", rawURL)
-	} else if podname == "" {
-		return "", fmt.Errorf("failed to get pod from endpoint %q", rawURL)
 	}
 
 	pod := &corev1.Pod{}
@@ -250,15 +246,17 @@ func parseEndpoint(rawURL string) (string, string, string, error) {
 	}
 
 	// split hostname -> pod.namespace
-	parts := strings.Split(endpoint.Hostname(), ".")
-	podname := parts[0]
-	namespace := ""
-	if len(parts) == 2 {
-		namespace = parts[1]
-	} else if len(parts) > 2 {
-		return "", "", "", fmt.Errorf("hostname %q is not in <pod>.<namespace> format", endpoint.Hostname())
+	hostName := endpoint.Hostname()
+	lastIndex := strings.LastIndex(hostName, ".")
+
+	// check for empty podname and namespace
+	if lastIndex <= 0 || lastIndex == len(hostName)-1 {
+		return "", "", "", fmt.Errorf("hostname %q is not in <pod>.<namespace> format", hostName)
 	}
 
+	podname := hostName[0:lastIndex]
+	namespace := hostName[lastIndex+1:]
+
 	return namespace, podname, endpoint.Port(), nil
 }
 

internal/controller/csiaddons/csiaddonsnode_controller_test.go

@@ -29,20 +29,30 @@ func TestParseEndpoint(t *testing.T) {
 	_, _, _, err := parseEndpoint("1.2.3.4:5678")
 	assert.True(t, errors.Is(err, errLegacyEndpoint))
 
-	namespace, podname, port, err := parseEndpoint("pod://pod-name:5678")
+	// test empty namespace
+	_, _, _, err = parseEndpoint("pod://pod-name:5678")
+	assert.Error(t, err)
+
+	// test empty namespace
+	_, _, _, err = parseEndpoint("pod://pod-name.:5678")
+	assert.Error(t, err)
+
+	namespace, podname, port, err := parseEndpoint("pod://pod-name.csi-addons:5678")
 	assert.NoError(t, err)
-	assert.Equal(t, namespace, "")
+	assert.Equal(t, namespace, "csi-addons")
 	assert.Equal(t, podname, "pod-name")
 	assert.Equal(t, port, "5678")
 
-	namespace, podname, port, err = parseEndpoint("pod://pod-name.csi-addons:5678")
+	namespace, podname, port, err = parseEndpoint("pod://csi.pod.ns-cluster.local:5678")
 	assert.NoError(t, err)
-	assert.Equal(t, namespace, "csi-addons")
-	assert.Equal(t, podname, "pod-name")
+	assert.Equal(t, namespace, "local")
+	assert.Equal(t, podname, "csi.pod.ns-cluster")
 	assert.Equal(t, port, "5678")
 
-	_, _, _, err = parseEndpoint("pod://pod.ns.cluster.local:5678")
+	// test empty podname
+	_, _, _, err = parseEndpoint("pod://.local:5678")
 	assert.Error(t, err)
+
 }
 
 func TestParseCapabilities(t *testing.T) {