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e49ca86ce4
* cleanup: go vet and golint run Various cleanups trickered by go vet and golint. * Fix tests and lowercase all errors Lowercase all errors, some tests in kubernetes use errors from kubernetes which do start with a capital letter.
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
package kubernetes
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import (
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"net"
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"strings"
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"github.com/coredns/coredns/middleware/etcd/msg"
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)
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// Federation holds TODO(...).
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type Federation struct {
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name string
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zone string
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}
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var localNodeName string
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var federationZone string
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var federationRegion string
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const (
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// TODO: Do not hardcode these labels. Pull them out of the API instead.
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//
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// We can get them via ....
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// import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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// metav1.LabelZoneFailureDomain
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// metav1.LabelZoneRegion
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//
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// But importing above breaks coredns with flag collision of 'log_dir'
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labelAvailabilityZone = "failure-domain.beta.kubernetes.io/zone"
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labelRegion = "failure-domain.beta.kubernetes.io/region"
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)
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// stripFederation removes the federation segment from the segment list, if it
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// matches a configured federation name.
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func (k *Kubernetes) stripFederation(segs []string) (string, []string) {
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if len(segs) < 3 {
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return "", segs
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}
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for _, f := range k.Federations {
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if f.name == segs[len(segs)-2] {
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fed := segs[len(segs)-2]
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segs[len(segs)-2] = segs[len(segs)-1]
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segs = segs[:len(segs)-1]
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return fed, segs
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}
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}
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return "", segs
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}
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// federationCNAMERecord returns a service record for the requested federated service
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// with the target host in the federated CNAME format which the external DNS provider
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// should be able to resolve
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func (k *Kubernetes) federationCNAMERecord(r recordRequest) msg.Service {
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myNodeName := k.localNodeName()
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node, err := k.APIConn.GetNodeByName(myNodeName)
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if err != nil {
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return msg.Service{}
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}
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for _, f := range k.Federations {
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if f.name != r.federation {
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continue
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}
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if r.endpoint == "" {
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return msg.Service{
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Key: strings.Join([]string{msg.Path(r.zone, "coredns"), r.typeName, r.federation, r.namespace, r.service}, "/"),
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Host: strings.Join([]string{r.service, r.namespace, r.federation, r.typeName, node.Labels[labelAvailabilityZone], node.Labels[labelRegion], f.zone}, "."),
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}
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}
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return msg.Service{
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Key: strings.Join([]string{msg.Path(r.zone, "coredns"), r.typeName, r.federation, r.namespace, r.service, r.endpoint}, "/"),
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Host: strings.Join([]string{r.endpoint, r.service, r.namespace, r.federation, r.typeName, node.Labels[labelAvailabilityZone], node.Labels[labelRegion], f.zone}, "."),
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}
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}
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return msg.Service{}
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}
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func (k *Kubernetes) localNodeName() string {
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if localNodeName != "" {
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return localNodeName
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}
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localIP := k.localPodIP()
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if localIP == nil {
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return ""
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}
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// Find endpoint matching localIP
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endpointsList := k.APIConn.EndpointsList()
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for _, ep := range endpointsList.Items {
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for _, eps := range ep.Subsets {
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for _, addr := range eps.Addresses {
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if localIP.Equal(net.ParseIP(addr.IP)) {
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localNodeName = *addr.NodeName
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return localNodeName
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}
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}
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}
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}
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return ""
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}
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