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controller.go
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controller.go
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package controller
import (
"context"
"fmt"
"net"
"github.com/moby/vpnkit/go/pkg/vpnkit"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
)
const annotation = "vpnkit-k8s-controller"
// Controller kubernetes controller used by Docker Desktop
type Controller struct {
services corev1client.ServicesGetter
client vpnkit.Client
}
// New creates a new controller
func New(client vpnkit.Client, services corev1client.ServicesGetter) *Controller {
return &Controller{
services: services,
client: client,
}
}
// Dispose unexpose all ports previously exposed by this controller
func (c *Controller) Dispose() {
ctx := context.Background()
ports, err := c.client.ListExposed(ctx)
if err != nil {
log.Infof("Cannot list exposed ports: %v", err)
return
}
for _, port := range ports {
if port.Annotation != annotation {
continue
}
if err := c.client.Unexpose(ctx, &port); err != nil {
log.Infof("cannot unexpose port: %v", err)
}
}
}
// OnAdd exposes port if necessary
func (c *Controller) OnAdd(obj interface{}) {
if err := c.ensureOpened(obj); err != nil {
log.Errorf("OnAdd failed: %v", err)
}
}
// OnUpdate exposes port if necessary
func (c *Controller) OnUpdate(oldObj, newObj interface{}) {
if err := c.closeAbsentPorts(oldObj, newObj); err != nil {
log.Errorf("OnUpdate failed: %v", err)
}
if err := c.ensureOpened(newObj); err != nil {
log.Errorf("OnUpdate failed: %v", err)
}
}
// OnDelete unexposes port
func (c *Controller) OnDelete(obj interface{}) {
if err := c.closeAbsentPorts(obj, &v1.Service{}); err != nil {
log.Errorf("OnUpdate failed: %v", err)
}
}
func (c *Controller) closeAbsentPorts(oldObj, newObj interface{}) error {
oldService, ok := oldObj.(*v1.Service)
if !ok {
return fmt.Errorf("received an invalid object, was expecting v1.Service")
}
newService, ok := newObj.(*v1.Service)
if !ok {
return fmt.Errorf("received an invalid object, was expecting v1.Service")
}
newPorts := servicePorts(newService)
for _, oldPort := range servicePorts(oldService) {
if !contains(newPorts, oldPort) {
if err := c.client.Unexpose(context.Background(), &oldPort); err != nil {
log.Errorf("cannot unexpose port: %s", err)
continue
}
log.Infof("Closed port %d", oldPort.OutPort)
}
}
return nil
}
func (c *Controller) ensureOpened(obj interface{}) error {
service, ok := obj.(*v1.Service)
if !ok {
return fmt.Errorf("received an invalid object, was expecting v1.Service")
}
ctx := context.Background()
opened, err := c.client.ListExposed(ctx)
if err != nil {
return errors.Wrap(err, "cannot list exposed ports")
}
for _, port := range servicePorts(service) {
if alreadyOpened(opened, port) {
log.Errorf("Port %d for service %s is already opened by another service", port.OutPort, service.Name)
continue
}
if contains(opened, port) {
log.Debugf("Port %d for service %s already opened", port.OutPort, service.Name)
continue
}
if err := c.client.Expose(ctx, &port); err != nil {
log.Debugf("cannot expose port: %v", err)
continue
}
log.Infof("Opened port %d for service %s:%d", port.OutPort, service.Name, port.InPort)
copy := service.DeepCopy()
copy.Status.LoadBalancer = v1.LoadBalancerStatus{
Ingress: []v1.LoadBalancerIngress{
{
Hostname: "localhost",
},
},
}
if _, err := c.services.Services(service.Namespace).UpdateStatus(copy); err != nil {
log.Errorf("Cannot update service status %s: %v", service.Name, err)
}
}
return nil
}
func contains(list []vpnkit.Port, given vpnkit.Port) bool {
for _, current := range list {
if equals(current, given) {
return true
}
}
return false
}
func equals(left vpnkit.Port, right vpnkit.Port) bool {
return left.Proto == right.Proto &&
left.OutPort == right.OutPort &&
left.InIP.Equal(right.InIP) &&
left.InPort == right.InPort
}
func alreadyOpened(s []vpnkit.Port, e vpnkit.Port) bool {
for _, a := range s {
if a.OutPort == e.OutPort {
return true
}
}
return false
}
func servicePorts(service *v1.Service) []vpnkit.Port {
var ports []vpnkit.Port
for _, servicePort := range service.Spec.Ports {
port, err := convert(service, servicePort)
if err != nil {
log.Debugf("Discarded service %s: %v", service.Name, err)
continue
}
if port != nil {
ports = append(ports, *port)
}
}
return ports
}
func convert(service *v1.Service, servicePort v1.ServicePort) (*vpnkit.Port, error) {
var protocol vpnkit.Protocol
switch servicePort.Protocol {
case v1.ProtocolTCP:
protocol = vpnkit.TCP
case v1.ProtocolUDP:
protocol = vpnkit.UDP
default:
return nil, errors.New("unrecognised servicePort.Protocol " + string(servicePort.Protocol))
}
switch service.Spec.Type {
case v1.ServiceTypeLoadBalancer:
return &vpnkit.Port{
Proto: protocol,
OutIP: net.ParseIP("0.0.0.0"),
OutPort: uint16(servicePort.Port),
InIP: net.ParseIP(service.Spec.ClusterIP),
InPort: uint16(servicePort.Port),
Annotation: annotation,
}, nil
case v1.ServiceTypeNodePort:
if servicePort.NodePort == 0 {
return nil, errors.New("NodePort is 0")
}
return &vpnkit.Port{
Proto: protocol,
OutIP: net.ParseIP("0.0.0.0"),
OutPort: uint16(servicePort.NodePort),
InIP: net.ParseIP(service.Spec.ClusterIP),
InPort: uint16(servicePort.Port),
Annotation: annotation,
}, nil
case v1.ServiceTypeClusterIP:
return nil, nil
default:
return nil, errors.Errorf("Unknown service type %s", service.Spec.Type)
}
}