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controller.go
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controller.go
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package main
import (
"bytes"
"encoding/json"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"regexp"
"strings"
"syscall"
"time"
"github.com/jpillora/backoff"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/watch"
)
const (
maxRetries = 10
)
type serviceEndpoints struct {
Service *v1.Service `json:"service"`
Endpoints *v1.Endpoints `json:"endpoints"`
}
func (se *serviceEndpoints) sanitize() {
// cleanup
se.Service.SelfLink = ""
se.Service.Status = v1.ServiceStatus{}
se.Service.UID = ""
se.Service.ResourceVersion = ""
se.Service.CreationTimestamp = metav1.Time{}
se.Service.Spec.ClusterIP = ""
se.Service.Spec.Selector = nil
se.Endpoints.SelfLink = ""
se.Endpoints.UID = ""
se.Endpoints.ResourceVersion = ""
se.Endpoints.CreationTimestamp = metav1.Time{}
for sb := range se.Endpoints.Subsets {
for ad := range se.Endpoints.Subsets[sb].Addresses {
se.Endpoints.Subsets[sb].Addresses[ad].NodeName = nil
se.Endpoints.Subsets[sb].Addresses[ad].TargetRef = nil
}
se.Endpoints.Subsets[sb].NotReadyAddresses = nil
}
delete(se.Service.Annotations, "kubectl.kubernetes.io/last-applied-configuration")
delete(se.Endpoints.Annotations, "endpoints.kubernetes.io/last-change-trigger-time")
}
func (se *serviceEndpoints) MarshalJSON() ([]byte, error) {
setemp := *se
setemp.sanitize()
return json.Marshal(setemp)
}
func watchServicesAndEndpoints(svcChan chan *serviceEndpoints) {
var stop bool
var stopChan = make(chan bool)
// handle shutdown
shutdown := make(chan os.Signal)
signal.Notify(shutdown, syscall.SIGTERM, syscall.SIGINT)
go func() {
<-shutdown
stop = true
stopChan <- stop
}()
go func() {
outer:
for !stop {
debug("create endpoints watcher")
epslices, err := clientset.DiscoveryV1beta1().EndpointSlices("").List(metav1.ListOptions{})
if epslices != nil && len(epslices.Items) > 0 {
log.Fatalf("FATAL: Detected Endpoint slices but this tool doesn't support it.")
}
epWatcher, err := clientset.CoreV1().Endpoints("").Watch(metav1.ListOptions{})
if err != nil {
log.Printf("error getting watcher for endpoints: %v", err)
continue
}
for {
var (
ep *v1.Endpoints
s *v1.Service
ok bool
)
select {
case event := <-epWatcher.ResultChan():
if stop {
debug("stopping watcher")
epWatcher.Stop()
break outer
}
if event.Type == watch.Added || event.Type == watch.Modified {
debug("received event: %v", event.Type)
ep, ok = event.Object.(*v1.Endpoints)
if !ok {
log.Printf("incorrect type found, expected Endpoints: %T", event.Object)
continue
}
if i := defaultConfig.SyncNamespaces.Search(ep.Namespace); i == len(defaultConfig.SyncNamespaces) ||
defaultConfig.SyncNamespaces[i] != ep.Namespace {
debug("skipping namespace '%s' for endpoint '%s' as its not in %v", ep.Namespace, ep.Name, defaultConfig.SyncNamespaces)
continue
}
regex := regexp.MustCompile(defaultConfig.SkipServicesRegex)
if regex.MatchString(ep.Name) {
debug("skipping service '%s' (ns: %s)", ep.Name, ep.Namespace)
continue
}
s, err = clientset.CoreV1().Services(ep.Namespace).Get(ep.Name, metav1.GetOptions{})
if err != nil {
log.Printf("failed to get service '%s' (ns:%s)", ep.Name, ep.Namespace)
continue
}
debug("Service: '%s' (ns:%s)", s.Name, s.Namespace)
a, ok := s.Annotations[syncedResourceAnnotation]
if ok && a == syncedResourceAnnotationVal {
debug("skipping annotated service '%s' (ns:%s)", s.Name, s.Namespace)
continue
}
if s.Spec.Type == v1.ServiceTypeLoadBalancer {
log.Printf("WARNNING: Serice of type LoadBalancer detected: '%s' (ns: %s)", s.Name, s.Namespace)
}
se := new(serviceEndpoints)
se.Service = s
se.Endpoints = ep
debugSpew(se)
svcChan <- se
} else {
debug("ignoring event %v: %v", event.Type, event.Object)
if event.Object == nil {
epWatcher.Stop()
continue outer
}
continue
}
case <-stopChan:
debug("received stop channel")
epWatcher.Stop()
break outer
}
}
}
debug("stop watching services")
svcChan <- nil
}()
}
func syncServicesController() {
var svcChan = make(chan *serviceEndpoints)
watchServicesAndEndpoints(svcChan)
for {
select {
case se := <-svcChan:
if se == nil {
debug("recieved no service, return")
return
}
debugSpew(se)
js, err := json.Marshal(se)
if err != nil {
log.Fatalf("failed to marshal service and endpoints into JSON: %v", err)
}
for pi := range defaultConfig.Peers {
go func(index int) {
b := backoff.Backoff{
Min: 1 * time.Second,
Max: 60 * time.Second,
Factor: 2,
Jitter: true,
}
i := 0
for i <= maxRetries {
i = i + 1
if index >= len(defaultConfig.Peers) {
log.Printf("Warrning: Peer index '%d' is out of bounds. ('%d' peers detected.) ", index, len(defaultConfig.Peers))
return
}
url := strings.TrimSuffix(defaultConfig.Peers[index], "/") + targetPath
debug("sending services to '%s' (index: %d)", defaultConfig.Peers[index], index)
debug(string(js))
resp, err := http.Post(url, "", bytes.NewBuffer(js))
if err != nil {
log.Printf("failed to post to target '%s': %v", url, err)
time.Sleep(b.Duration())
} else {
msg, _ := ioutil.ReadAll(resp.Body)
debug("(url: %s) response status: '%s', message: '%s'", url, resp.Status, string(msg))
return
}
}
}(pi)
}
}
}
}