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|
package setup
import (
//"crypto/tls"
//"crypto/x509"
"fmt"
//"io/ioutil"
//"net"
//"net/http"
"strings"
//"time"
"github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/middleware/kubernetes"
k8sc "github.com/miekg/coredns/middleware/kubernetes/k8sclient"
"github.com/miekg/coredns/middleware/kubernetes/nametemplate"
"github.com/miekg/coredns/middleware/proxy"
//"github.com/miekg/coredns/middleware/singleflight"
"golang.org/x/net/context"
)
const (
defaultK8sEndpoint = "http://localhost:8080"
defaultNameTemplate = "{service}.{namespace}.{zone}"
)
// Kubernetes sets up the kubernetes middleware.
func Kubernetes(c *Controller) (middleware.Middleware, error) {
fmt.Println("controller %v", c)
// TODO: Determine if subzone support required
kubernetes, err := kubernetesParse(c)
if err != nil {
return nil, err
}
return func(next middleware.Handler) middleware.Handler {
kubernetes.Next = next
return kubernetes
}, nil
}
func kubernetesParse(c *Controller) (kubernetes.Kubernetes, error) {
/*
* TODO: Remove unused state and simplify.
* Inflight and Ctx might not be needed. Leaving in place until
* we take a pass at API caching and optimizing connector to the
* k8s API. Single flight (or limited upper-bound) for inflight
* API calls may be desirable.
*/
k8s := kubernetes.Kubernetes{
Proxy: proxy.New([]string{}),
Ctx: context.Background(),
// Inflight: &singleflight.Group{},
}
var (
endpoints = []string{defaultK8sEndpoint}
template = defaultNameTemplate
namespaces = []string{}
)
k8s.APIConn = k8sc.NewK8sConnector(endpoints[0])
k8s.NameTemplate = new(nametemplate.NameTemplate)
k8s.NameTemplate.SetTemplate(template)
for c.Next() {
if c.Val() == "kubernetes" {
zones := c.RemainingArgs()
if len(zones) == 0 {
k8s.Zones = c.ServerBlockHosts
} else {
// Normalize requested zones
k8s.Zones = kubernetes.NormalizeZoneList(zones)
}
middleware.Zones(k8s.Zones).FullyQualify()
if c.NextBlock() {
// TODO(miek): 2 switches?
switch c.Val() {
case "endpoint":
args := c.RemainingArgs()
if len(args) == 0 {
return kubernetes.Kubernetes{}, c.ArgErr()
}
endpoints = args
k8s.APIConn = k8sc.NewK8sConnector(endpoints[0])
}
for c.Next() {
switch c.Val() {
case "template":
args := c.RemainingArgs()
if len(args) == 0 {
return kubernetes.Kubernetes{}, c.ArgErr()
}
template = strings.Join(args, "")
err := k8s.NameTemplate.SetTemplate(template)
if err != nil {
return kubernetes.Kubernetes{}, err
}
case "namespaces":
args := c.RemainingArgs()
if len(args) == 0 {
return kubernetes.Kubernetes{}, c.ArgErr()
}
namespaces = args
k8s.Namespaces = &namespaces
}
}
}
return k8s, nil
}
}
fmt.Println("here before return")
return kubernetes.Kubernetes{}, nil
}
|
