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Make CoreDNS a server type plugin for Caddy (#220)

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* Make CoreDNS a server type plugin for Caddy

Remove code we don't need and port all middleware over. Fix all tests
and rework the documentation.

Also make `go generate` build a caddy binary which we then copy into
our directory. This means `go build`-builds remain working as-is.

And new etc instances in each etcd test for better isolation.
Fix more tests and rework test.Server with the newer support Caddy offers.

Fix Makefile to support new mode of operation.
This commit is contained in:
Miek Gieben
2016-08-19 17:14:17 -07:00
committed by GitHub
parent a1989c3523
commit 9ac3cab1b7
140 changed files with 2058 additions and 8229 deletions
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56
middleware/kubernetes/controller.go
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@@ -2,7 +2,6 @@ package kubernetes
import (
"fmt"
"log"
"sync"
"time"
@@ -12,7 +11,7 @@ import (
"k8s.io/kubernetes/pkg/client/cache"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/controller/framework"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/watch"
)
@@ -24,7 +23,7 @@ var (
type dnsController struct {
client *client.Client
selector *labels.Selector
selector *labels.Selector
endpController *framework.Controller
svcController *framework.Controller
@@ -45,9 +44,9 @@ type dnsController struct {
// newDNSController creates a controller for coredns
func newdnsController(kubeClient *client.Client, resyncPeriod time.Duration, lselector *labels.Selector) *dnsController {
dns := dnsController{
client: kubeClient,
selector: lselector,
stopCh: make(chan struct{}),
client: kubeClient,
selector: lselector,
stopCh: make(chan struct{}),
}
dns.endpLister.Store, dns.endpController = framework.NewInformer(
@@ -76,54 +75,54 @@ func newdnsController(kubeClient *client.Client, resyncPeriod time.Duration, lse
func serviceListFunc(c *client.Client, ns string, s *labels.Selector) func(api.ListOptions) (runtime.Object, error) {
return func(opts api.ListOptions) (runtime.Object, error) {
if s != nil {
opts.LabelSelector = *s
}
if s != nil {
opts.LabelSelector = *s
}
return c.Services(ns).List(opts)
}
}
func serviceWatchFunc(c *client.Client, ns string, s *labels.Selector) func(options api.ListOptions) (watch.Interface, error) {
return func(options api.ListOptions) (watch.Interface, error) {
if s != nil {
options.LabelSelector = *s
}
if s != nil {
options.LabelSelector = *s
}
return c.Services(ns).Watch(options)
}
}
func endpointsListFunc(c *client.Client, ns string, s *labels.Selector) func(api.ListOptions) (runtime.Object, error) {
return func(opts api.ListOptions) (runtime.Object, error) {
if s != nil {
opts.LabelSelector = *s
}
if s != nil {
opts.LabelSelector = *s
}
return c.Endpoints(ns).List(opts)
}
}
func endpointsWatchFunc(c *client.Client, ns string, s *labels.Selector) func(options api.ListOptions) (watch.Interface, error) {
return func(options api.ListOptions) (watch.Interface, error) {
if s != nil {
options.LabelSelector = *s
}
if s != nil {
options.LabelSelector = *s
}
return c.Endpoints(ns).Watch(options)
}
}
func namespaceListFunc(c *client.Client, s *labels.Selector) func(api.ListOptions) (runtime.Object, error) {
return func(opts api.ListOptions) (runtime.Object, error) {
if s != nil {
opts.LabelSelector = *s
}
if s != nil {
opts.LabelSelector = *s
}
return c.Namespaces().List(opts)
}
}
func namespaceWatchFunc(c *client.Client, s *labels.Selector) func(options api.ListOptions) (watch.Interface, error) {
return func(options api.ListOptions) (watch.Interface, error) {
if s != nil {
options.LabelSelector = *s
}
if s != nil {
options.LabelSelector = *s
}
return c.Namespaces().Watch(options)
}
}
@@ -140,7 +139,6 @@ func (dns *dnsController) Stop() error {
// Only try draining the workqueue if we haven't already.
if !dns.shutdown {
close(dns.stopCh)
log.Println("shutting down controller queues")
dns.shutdown = true
return nil
@@ -151,14 +149,10 @@ func (dns *dnsController) Stop() error {
// Run starts the controller.
func (dns *dnsController) Run() {
log.Println("[debug] Starting k8s notification controllers")
go dns.endpController.Run(dns.stopCh)
go dns.svcController.Run(dns.stopCh)
go dns.nsController.Run(dns.stopCh)
<-dns.stopCh
log.Println("[debug] shutting down coredns controller")
}
func (dns *dnsController) GetNamespaceList() *api.NamespaceList {
@@ -203,12 +197,12 @@ func (dns *dnsController) GetServiceInNamespace(namespace string, servicename st
svcObj, svcExists, err := dns.svcLister.Store.GetByKey(svcKey)
if err != nil {
log.Printf("error getting service %v from the cache: %v\n", svcKey, err)
// TODO(...): should return err here
return nil
}
if !svcExists {
log.Printf("service %v does not exists\n", svcKey)
// TODO(...): should return err here
return nil
}