111 lines
2.7 KiB
Go
111 lines
2.7 KiB
Go
package setup
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import (
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"log"
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"strings"
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"github.com/miekg/coredns/middleware"
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"github.com/miekg/coredns/middleware/kubernetes"
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k8sc "github.com/miekg/coredns/middleware/kubernetes/k8sclient"
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"github.com/miekg/coredns/middleware/kubernetes/nametemplate"
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"github.com/miekg/coredns/middleware/proxy"
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)
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const (
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defaultK8sEndpoint = "http://localhost:8080"
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defaultNameTemplate = "{service}.{namespace}.{zone}"
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)
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// Kubernetes sets up the kubernetes middleware.
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func Kubernetes(c *Controller) (middleware.Middleware, error) {
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log.Printf("[debug] controller %v\n", c)
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// TODO: Determine if subzone support required
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kubernetes, err := kubernetesParse(c)
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if err != nil {
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return nil, err
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}
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return func(next middleware.Handler) middleware.Handler {
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kubernetes.Next = next
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return kubernetes
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}, nil
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}
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func kubernetesParse(c *Controller) (kubernetes.Kubernetes, error) {
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k8s := kubernetes.Kubernetes{
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Proxy: proxy.New([]string{}),
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}
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var (
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endpoints = []string{defaultK8sEndpoint}
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template = defaultNameTemplate
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namespaces = []string{}
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)
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k8s.APIConn = k8sc.NewK8sConnector(endpoints[0])
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k8s.NameTemplate = new(nametemplate.NameTemplate)
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k8s.NameTemplate.SetTemplate(template)
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for c.Next() {
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if c.Val() == "kubernetes" {
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zones := c.RemainingArgs()
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if len(zones) == 0 {
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k8s.Zones = c.ServerBlockHosts
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} else {
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// Normalize requested zones
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k8s.Zones = kubernetes.NormalizeZoneList(zones)
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}
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// TODO: clean this parsing up
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middleware.Zones(k8s.Zones).FullyQualify()
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log.Printf("[debug] c data: %v\n", c)
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if c.NextBlock() {
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// TODO(miek): 2 switches?
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switch c.Val() {
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case "endpoint":
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args := c.RemainingArgs()
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if len(args) == 0 {
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return kubernetes.Kubernetes{}, c.ArgErr()
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}
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endpoints = args
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k8s.APIConn = k8sc.NewK8sConnector(endpoints[0])
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case "namespaces":
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args := c.RemainingArgs()
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if len(args) == 0 {
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return kubernetes.Kubernetes{}, c.ArgErr()
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}
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namespaces = args
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k8s.Namespaces = append(k8s.Namespaces, namespaces...)
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}
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for c.Next() {
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switch c.Val() {
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case "template":
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args := c.RemainingArgs()
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if len(args) == 0 {
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return kubernetes.Kubernetes{}, c.ArgErr()
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}
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template = strings.Join(args, "")
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err := k8s.NameTemplate.SetTemplate(template)
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if err != nil {
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return kubernetes.Kubernetes{}, err
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}
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case "namespaces":
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args := c.RemainingArgs()
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if len(args) == 0 {
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return kubernetes.Kubernetes{}, c.ArgErr()
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}
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namespaces = args
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k8s.Namespaces = append(k8s.Namespaces, namespaces...)
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}
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}
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}
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return k8s, nil
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}
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}
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return kubernetes.Kubernetes{}, nil
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}
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