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setup.go
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setup.go
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package kubeapi
import (
"context"
"fmt"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
clog "github.com/coredns/coredns/plugin/pkg/log"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/clientcmd/api"
)
const pluginName = "kubeapi"
var log = clog.NewWithPlugin(pluginName)
func init() { plugin.Register(pluginName, setup) }
func setup(c *caddy.Controller) error {
k, err := parse(c)
if err != nil {
return plugin.Error(pluginName, err)
}
err = k.InitAPIConn(context.Background())
if err != nil {
return plugin.Error(pluginName, err)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
k.Next = next
return k
})
return nil
}
func parse(c *caddy.Controller) (*KubeAPI, error) {
var (
kns *KubeAPI
err error
)
i := 0
for c.Next() {
if i > 0 {
return nil, plugin.ErrOnce
}
i++
kns, err = parseStanza(c)
if err != nil {
return kns, err
}
}
return kns, nil
}
// parseStanza parses a kubeapi stanza
func parseStanza(c *caddy.Controller) (*KubeAPI, error) {
kns := new(KubeAPI)
for c.NextBlock() {
switch c.Val() {
case "endpoint":
args := c.RemainingArgs()
if len(args) != 1 {
return nil, c.ArgErr()
}
kns.APIServer = args[0]
case "tls": // cert key ca
args := c.RemainingArgs()
if len(args) == 3 {
kns.APIClientCert, kns.APIClientKey, kns.APICertAuth = args[0], args[1], args[2]
continue
}
return nil, c.ArgErr()
case "kubeconfig":
args := c.RemainingArgs()
if len(args) != 1 && len(args) != 2 {
return nil, c.ArgErr()
}
overrides := &clientcmd.ConfigOverrides{}
if len(args) == 2 {
overrides.CurrentContext = args[1]
}
config := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
&clientcmd.ClientConfigLoadingRules{ExplicitPath: args[0]},
overrides,
)
kns.ClientConfig = config
default:
return nil, c.Errf("unknown property '%s'", c.Val())
}
}
return kns, nil
}
// getClientConfig generates a client config from the plugin settings
func (k *KubeAPI) getClientConfig() (*rest.Config, error) {
if k.ClientConfig != nil {
return k.ClientConfig.ClientConfig()
}
loadingRules := &clientcmd.ClientConfigLoadingRules{}
overrides := &clientcmd.ConfigOverrides{}
clusterinfo := api.Cluster{}
authinfo := api.AuthInfo{}
// Connect to API from in cluster
if k.APIServer == "" {
cc, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
cc.ContentType = "application/vnd.kubernetes.protobuf"
return cc, err
}
// Connect to API from out of cluster
clusterinfo.Server = k.APIServer
if len(k.APICertAuth) > 0 {
clusterinfo.CertificateAuthority = k.APICertAuth
}
if len(k.APIClientCert) > 0 {
authinfo.ClientCertificate = k.APIClientCert
}
if len(k.APIClientKey) > 0 {
authinfo.ClientKey = k.APIClientKey
}
overrides.ClusterInfo = clusterinfo
overrides.AuthInfo = authinfo
clientConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, overrides)
cc, err := clientConfig.ClientConfig()
if err != nil {
return nil, err
}
cc.ContentType = "application/vnd.kubernetes.protobuf"
return cc, err
}
// InitAPIConn initializes the Kubernetes API client
func (k *KubeAPI) InitAPIConn(ctx context.Context) (err error) {
if k.Client == nil {
config, err := k.getClientConfig()
if err != nil {
return err
}
kubeClient, err := kubernetes.NewForConfig(config)
if err != nil {
return fmt.Errorf("failed to create kubernetes notification controller: %q", err)
}
k.Client = kubeClient
}
return err
}