[WIP] first implementation stubs

internal/k8s.go

@@ -0,0 +1,61 @@
+package internal
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"html/template"
+
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+func RecreateDnsCrd() error {
+	k8s_config, err := rest.InClusterConfig()
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not create in cluster k8s config: %v", err))
+	}
+	_, err = kubernetes.NewForConfig(k8s_config)
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not create k8s client: %v", err))
+	}
+	return nil
+}
+
+var CRD_TEMPLATE = `
+apiVersion: externaldns.k8s.io/v1alpha1
+kind: DNSEndpoint
+metadata:
+  name: {{ .Name }}
+  annotations: 
+    external.dns/provider: cf
+spec:
+  endpoints:
+  - dnsName: mail
+    recordTTL: 180
+    recordType: A
+    targets:
+    - {{ .IP }}
+`
+
+type CrdConfig struct {
+	Name string
+	IP   string
+}
+
+func generateCrd(name string, ip string) (string, error) {
+	config := CrdConfig{
+		Name: name,
+		IP:   ip,
+	}
+	tmpl, err := template.New("crd").Parse(CRD_TEMPLATE)
+	if err != nil {
+		return "", errors.New(fmt.Sprintf("Errors in crd template: %s", err.Error()))
+	}
+	var buf bytes.Buffer
+	err = tmpl.Execute(&buf, &config)
+	if err != nil {
+		return "", errors.New(fmt.Sprintf("Could not render crd template: %s", err.Error()))
+	}
+	return buf.String(), nil
+}