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https://github.com/coredns/coredns.git
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aacb91ef0b
Remove the intermediate step of gathering everyhing in a kPod and kService and extracting the msg.Service from there. Now findPods and findServices return []msg.Service. This cuts down on the code and also removed the double looping of finding the data we need, so it should be faster.
56 lines
1.7 KiB
Go
56 lines
1.7 KiB
Go
package kubernetes
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import (
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"strings"
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"github.com/coredns/coredns/middleware"
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"github.com/coredns/coredns/middleware/etcd/msg"
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"github.com/coredns/coredns/middleware/pkg/dnsutil"
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"github.com/coredns/coredns/request"
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)
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// Reverse implements the ServiceBackend interface.
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func (k *Kubernetes) Reverse(state request.Request, exact bool, opt middleware.Options) ([]msg.Service, []msg.Service, error) {
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ip := dnsutil.ExtractAddressFromReverse(state.Name())
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if ip == "" {
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return nil, nil, nil
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}
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records := k.serviceRecordForIP(ip, state.Name())
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return records, nil, nil
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}
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// serviceRecordForIP gets a service record with a cluster ip matching the ip argument
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// If a service cluster ip does not match, it checks all endpoints
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func (k *Kubernetes) serviceRecordForIP(ip, name string) []msg.Service {
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// First check services with cluster ips
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svcList := k.APIConn.ServiceList()
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for _, service := range svcList {
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if (len(k.Namespaces) > 0) && !k.namespaceExposed(service.Namespace) {
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continue
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}
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if service.Spec.ClusterIP == ip {
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domain := strings.Join([]string{service.Name, service.Namespace, Svc, k.primaryZone()}, ".")
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return []msg.Service{{Host: domain}}
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}
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}
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// If no cluster ips match, search endpoints
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epList := k.APIConn.EndpointsList()
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for _, ep := range epList.Items {
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if (len(k.Namespaces) > 0) && !k.namespaceExposed(ep.ObjectMeta.Namespace) {
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continue
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}
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for _, eps := range ep.Subsets {
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for _, addr := range eps.Addresses {
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if addr.IP == ip {
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domain := strings.Join([]string{endpointHostname(addr), ep.ObjectMeta.Name, ep.ObjectMeta.Namespace, Svc, k.primaryZone()}, ".")
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return []msg.Service{{Host: domain}}
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}
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}
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}
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}
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return nil
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}
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