7e56cc74e5
* middleware/kubernetes: pull TXT out of parseRequest Put the TXT handling one layer higher and remove it from parseRequest. Also rename the podsvc field in there to podOrSvc. Now that it isn't used anymore for TXT record (dns-version) that was put in there. We can make this a boolean (in a future PR). Make parseRequest get an optional Zone that is from state.Zone and use that instead of its own code. Removed some tests and other smaller cleanups. Fixes #836 * add this reverse * another check * readd * Rename to kPod and kService for some clarity
96 lines
2.6 KiB
Go
96 lines
2.6 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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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.podOrSvc, r.federation, r.namespace, r.service}, "/"),
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Host: strings.Join([]string{r.service, r.namespace, r.federation, r.podOrSvc, 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.podOrSvc, 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.podOrSvc, 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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localIP := k.interfaceAddrsFunc()
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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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return *addr.NodeName
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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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