Move federation plugin to github.com/coredns/federation (#3139)

* Remove federation

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Rebuild and point to github.com/coredns/federation

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Export `localNodeName` => `LocalNodeName`, to be used by federation (until deprecation)

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Remove plugin/kubernetes/federation.go (=> kubernetes/federation repo)

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update github.com/coredns/federation

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* sticker-ci fix

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

1 files changed, 0 insertions, 51 deletions

diff --git a/plugin/kubernetes/federation.go b/plugin/kubernetes/federation.go
deleted file mode 100644
index bf169b911..000000000
--- a/plugin/kubernetes/federation.go
+++ /dev/null
@@ -1,51 +0,0 @@
-package kubernetes
-
-import (
-	"errors"
-
-	"github.com/coredns/coredns/plugin/etcd/msg"
-	"github.com/coredns/coredns/plugin/pkg/dnsutil"
-	"github.com/coredns/coredns/request"
-)
-
-// The federation node.Labels keys used.
-const (
-	// TODO: Do not hardcode these labels. Pull them out of the API instead.
-	//
-	// We can get them via ....
-	//   import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	//     metav1.LabelZoneFailureDomain
-	//     metav1.LabelZoneRegion
-	//
-	// But importing above breaks coredns with flag collision of 'log_dir'
-
-	LabelZone   = "failure-domain.beta.kubernetes.io/zone"
-	LabelRegion = "failure-domain.beta.kubernetes.io/region"
-)
-
-// Federations is used from the federations plugin to return the service that should be
-// returned as a CNAME for federation(s) to work.
-func (k *Kubernetes) Federations(state request.Request, fname, fzone string) (msg.Service, error) {
-	nodeName := k.localNodeName()
-	node, err := k.APIConn.GetNodeByName(nodeName)
-	if err != nil {
-		return msg.Service{}, err
-	}
-	r, err := parseRequest(state)
-	if err != nil {
-		return msg.Service{}, err
-	}
-
-	lz := node.Labels[LabelZone]
-	lr := node.Labels[LabelRegion]
-
-	if lz == "" || lr == "" {
-		return msg.Service{}, errors.New("local node missing zone/region labels")
-	}
-
-	if r.endpoint == "" {
-		return msg.Service{Host: dnsutil.Join(r.service, r.namespace, fname, r.podOrSvc, lz, lr, fzone)}, nil
-	}
-
-	return msg.Service{Host: dnsutil.Join(r.endpoint, r.service, r.namespace, fname, r.podOrSvc, lz, lr, fzone)}, nil
-}