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controller.go
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controller.go
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package controller
import (
"context"
"fmt"
"reflect"
"strings"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/util/retry"
"k8s.io/klog/v2"
"github.com/archway-network/endpoint-controller/pkg/blockchain"
)
const (
EndpointControllerEnable = "endpoint-controller/enable"
EndpointControllerTargets = "endpoint-controller/targets"
)
// Controller defines the endpoint controller.
type Controller struct {
Clientset kubernetes.Interface
Resync time.Duration
BlockMiss int
}
// Run starts the endpoint controller.
func (c *Controller) Run() {
klog.Info("Starting endpoint controller...")
// set up the resync timer
timer := time.NewTicker(c.Resync)
defer timer.Stop()
klog.Infof("Synching every %s", c.Resync)
c.resyncEndpoints()
for range timer.C {
klog.Info("Resynching endpoints")
c.resyncEndpoints()
}
}
// checkPortSync checks ports are matching between service and endpoint.
func (c *Controller) checkPortSync(service corev1.Service, endpoints corev1.Endpoints) bool {
serviceEndpointPortObjects := createEndpointPortObject(service)
if len(serviceEndpointPortObjects) != len(endpoints.Subsets[0].Ports) {
return false
}
for i, x := range serviceEndpointPortObjects {
if x != endpoints.Subsets[0].Ports[i] {
return false
}
}
return true
}
// create endpoint port object.
func createEndpointPortObject(service corev1.Service) []corev1.EndpointPort {
var ports []corev1.EndpointPort
for _, port := range service.Spec.Ports {
ports = append(ports, corev1.EndpointPort{
Name: port.Name, Protocol: port.Protocol, Port: port.Port,
})
}
return ports
}
// create endpoint addresses object.
func createEndpointAddressObject(service corev1.Service) ([]corev1.EndpointAddress, error) {
var addresses []corev1.EndpointAddress
serviceEndpointsAddress := service.Annotations[EndpointControllerTargets]
if serviceEndpointsAddress == "" {
return addresses, fmt.Errorf(
"%s : annotation endpoint-controller/targets is empty",
service.Name,
)
}
for _, address := range strings.Split(serviceEndpointsAddress, ",") {
addresses = append(addresses, corev1.EndpointAddress{
IP: strings.TrimSpace(address),
})
}
return addresses, nil
}
// patchEndpoints patches the endpoint with correct set of data.
func (c *Controller) patchEndpoints(endpoints corev1.Endpoints) error {
_, err := c.Clientset.CoreV1().Endpoints(endpoints.Namespace).Update(
context.Background(), &endpoints, v1.UpdateOptions{},
)
if err != nil {
return err
}
klog.Infof("Updated endpoint %s", endpoints.Name)
return nil
}
// createEndpoints creates an endpoint for the given service.
func (c *Controller) createEndpoints(service corev1.Service) error {
var err error
var subset corev1.EndpointSubset
retryErr := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
endpoints := &corev1.Endpoints{
ObjectMeta: v1.ObjectMeta{
Name: service.Name,
Namespace: service.Namespace,
Annotations: map[string]string{EndpointControllerEnable: "true"},
},
Subsets: []corev1.EndpointSubset{},
}
// create subset objects.
subset.Ports = createEndpointPortObject(service)
subset.Addresses, err = createEndpointAddressObject(service)
if err != nil {
return err
}
endpoints.Subsets = append(endpoints.Subsets, subset)
// create the endpoints.
_, err = c.Clientset.CoreV1().Endpoints(service.Namespace).Create(
context.Background(), endpoints, v1.CreateOptions{},
)
if err != nil {
return err
}
klog.Infof("Created endpoint for service %s\n", service.Name)
return nil
})
return retryErr
}
// resyncEndpoints updates all endpoints for the watched services.
func (c *Controller) resyncEndpoints() {
services, err := c.Clientset.CoreV1().Services("").List(context.Background(), v1.ListOptions{})
if err != nil {
klog.Error(err)
}
// check all services that have operator enabled.
for _, service := range services.Items {
if service.Annotations[EndpointControllerEnable] == "true" {
if err = c.findEndpoints(service); err != nil {
klog.Error(err)
}
}
}
klog.Info("Finished synching endpoints")
}
// findEndpoints
// finds endpoints and checks if it matches with the service
// if it matches, checks the endpoints targets health
// if not found, creates the endpoints
// return error if something breaks.
func (c *Controller) findEndpoints(service corev1.Service) error {
endpoints, err := c.Clientset.CoreV1().
Endpoints(service.Namespace).
Get(context.Background(), service.Name, v1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
if err = c.createEndpoints(service); err != nil {
return err
}
}
return err
}
return c.checkEndpoints(service, *endpoints)
}
// check if endpoint exists and the configuration is up to date
// return error if nothing goes wrong.
func (c *Controller) checkEndpoints(service corev1.Service, endpoint corev1.Endpoints) error {
if !c.checkPortSync(service, endpoint) {
endpoint.Subsets[0].Ports = createEndpointPortObject(service)
if err := c.patchEndpoints(endpoint); err != nil {
return err
}
}
// split the annotation and remove spaces
ips := strings.Split(service.Annotations[EndpointControllerTargets], ",")
for ip := range ips {
ips[ip] = strings.TrimSpace(ips[ip])
}
healthyTargets := blockchain.HealthCheck(
ips,
endpoint.Subsets[0].Ports,
c.BlockMiss,
)
if len(healthyTargets) == 0 {
return fmt.Errorf("no healthy targets")
}
if EndpointUpdateNeeded(healthyTargets, endpoint.Subsets[0].Addresses) {
return c.UpdateEndpointTargets(endpoint, healthyTargets)
}
return nil
}
// endpointUpdateNeeded
// check if the endpoint needs to be updated
// return true if update is needed
// return false if update is not needed.
func EndpointUpdateNeeded(
healthyTargets []string,
endpointAddresses []corev1.EndpointAddress,
) bool {
var addressList []string
for _, address := range endpointAddresses {
addressList = append(addressList, address.IP)
}
return !reflect.DeepEqual(healthyTargets, addressList)
}
// Update endpoint targets.
func (c *Controller) UpdateEndpointTargets(endpoints corev1.Endpoints, ips []string) error {
endpointAddressList := []corev1.EndpointAddress{}
for _, ip := range ips {
endpointAddressList = append(endpointAddressList, corev1.EndpointAddress{
IP: ip,
})
endpoints.Subsets[0].Addresses = endpointAddressList
}
klog.Infof("resynching endpoints (%s) targets (%s)", endpoints.Name, ips)
return c.patchEndpoints(endpoints)
}