9546b606cb
* plugin/kubernetes: remove bunch a string ops This removes a bunch of appends to where not needed, makes dnsutil.Join take variadic args which removes the need to wrap in a new string slice. Signed-off-by: Miek Gieben <miek@miek.nl> * Fix calls to dnsutil.Join Signed-off-by: Miek Gieben <miek@miek.nl> * Revert these Signed-off-by: Miek Gieben <miek@miek.nl>
51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
package kubernetes
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import (
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"errors"
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"github.com/coredns/coredns/plugin/etcd/msg"
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"github.com/coredns/coredns/plugin/pkg/dnsutil"
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"github.com/coredns/coredns/request"
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)
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// The federation node.Labels keys used.
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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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LabelZone = "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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// Federations is used from the federations plugin to return the service that should be
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// returned as a CNAME for federation(s) to work.
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func (k *Kubernetes) Federations(state request.Request, fname, fzone string) (msg.Service, error) {
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nodeName := k.localNodeName()
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node, err := k.APIConn.GetNodeByName(nodeName)
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if err != nil {
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return msg.Service{}, err
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}
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r, err := parseRequest(state)
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if err != nil {
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return msg.Service{}, err
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}
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lz := node.Labels[LabelZone]
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lr := node.Labels[LabelRegion]
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if lz == "" || lr == "" {
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return msg.Service{}, errors.New("local node missing zone/region labels")
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}
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if r.endpoint == "" {
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return msg.Service{Host: dnsutil.Join(r.service, r.namespace, fname, r.podOrSvc, lz, lr, fzone)}, nil
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}
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return msg.Service{Host: dnsutil.Join(r.endpoint, r.service, r.namespace, fname, r.podOrSvc, lz, lr, fzone)}, nil
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}
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