[WIP] first implementation stubs

internal/config.go

@@ -0,0 +1,31 @@
+package internal
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/jinzhu/configor"
+)
+
+type Config = struct {
+	LogLevel      string `default:"Info" env:"MAIL_DNS_SERVICE_LOGLEVEL"`
+	LabelSelector string `default:"kops.k8s.io/instance-role=Node" env:"MAIL_DNS_SERVICE_LABELSELECTOR"`
+	HcloudToken   string `default:"" env:"MAIL_DNS_SERVICE_HCLOUD_TOKEN"`
+}
+
+func GenConfig() (cfg *Config, err error) {
+
+	cfg = &Config{}
+
+	err = configor.New(&configor.Config{
+		ENVPrefix:          "METALLB_IP_FLOATER",
+		AutoReload:         true,
+		Silent:             true,
+		AutoReloadInterval: time.Minute}).Load(cfg, "config.json")
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Error generating Config: %s", err.Error()))
+	}
+	return cfg, nil
+
+}

internal/config_test.go

@@ -0,0 +1,22 @@
+package internal
+
+import (
+	"reflect"
+	"testing"
+)
+
+var defaultConfig = Config{
+	LogLevel:      "Info",
+	LabelSelector: "kops.k8s.io/instance-role=Node",
+	HcloudToken:   "",
+}
+
+func TestConfigDefaults(t *testing.T) {
+	cfg, err := GenConfig()
+	if err != nil {
+		t.Errorf("%s", err.Error())
+	}
+	if !reflect.DeepEqual(&defaultConfig, cfg) {
+		t.Errorf("got %+v, want %+v", cfg, defaultConfig)
+	}
+}

internal/health.go

@@ -0,0 +1,31 @@
+package internal
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	log "github.com/sirupsen/logrus"
+)
+
+func StartHealthEndpoint() {
+	r := mux.NewRouter()
+	r.Use(mux.CORSMethodMiddleware(r))
+	r.HandleFunc("/health", send200).Methods(http.MethodGet)
+	err := http.ListenAndServe("0.0.0.0:8080", r)
+	if err != nil {
+		log.WithFields(log.Fields{
+			"Caller": "StartHealthEndpoint",
+		}).Error(fmt.Sprintf("Error creating health endpoint: %s", err.Error()))
+	}
+}
+
+func send200(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	_, err := w.Write([]byte{})
+	if err != nil {
+		log.WithFields(log.Fields{
+			"Caller": "send200",
+		}).Error(fmt.Sprintf("Error answering health endpoint: %s", err.Error()))
+	}
+}

internal/health_test.go

@@ -0,0 +1,23 @@
+package internal
+
+import (
+	"net/http"
+	"strings"
+	"testing"
+)
+
+func TestHealth(t *testing.T) {
+	go func() {
+		StartHealthEndpoint()
+	}()
+	request, _ := http.NewRequest(http.MethodGet, "http://localhost:8080/health", strings.NewReader(""))
+	resp, err := http.DefaultClient.Do(request)
+
+	if err != nil {
+		t.Errorf("Health endpoint did not start: %v", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Bad response from health endpoint. Want: %d, got %d", http.StatusOK, resp.StatusCode)
+	}
+}

internal/hetzner.go

@@ -0,0 +1,41 @@
+package internal
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+	log "github.com/sirupsen/logrus"
+)
+
+func GetAllNodes(cfg *Config) ([]*hcloud.Server, error) {
+	client := hcloud.NewClient(hcloud.WithToken(cfg.HcloudToken))
+	servers, _, err := client.Server.List(context.TODO(), hcloud.ServerListOpts{
+		ListOpts: hcloud.ListOpts{
+			LabelSelector: cfg.LabelSelector,
+		}})
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Error listing Hetzner Nodes: %s", err.Error()))
+	}
+
+	if servers == nil {
+		return nil, errors.New(fmt.Sprintf("No Nodes found with label selector: %s", cfg.LabelSelector))
+	}
+	return servers, nil
+
+}
+
+func GetAllIps(servers []*hcloud.Server) ([]string, error) {
+	ips := make([]string, len(servers))
+	for i, instance := range servers {
+		if len(instance.PrivateNet) == 0 || instance.PrivateNet[0].IP == nil {
+			return []string{""}, errors.New(fmt.Sprintf("Instance %s has no attached IP", instance.Name))
+		}
+		log.WithFields(log.Fields{
+			"Caller": "GetAllIps",
+		}).Info(fmt.Sprintf("Found IP: %s", instance.PrivateNet[0].IP.String()))
+		ips[i] = instance.PrivateNet[0].IP.String()
+	}
+	return ips, nil
+}

internal/hetzner_test.go

@@ -0,0 +1,30 @@
+package internal
+
+import (
+	"testing"
+
+	"github.com/hetznercloud/hcloud-go/hcloud"
+)
+
+func TestGetAllIps(t *testing.T) {
+
+	servers := []*hcloud.Server{{
+		Status: hcloud.ServerStatusRunning,
+		Name:   "Test",
+	}}
+
+	servers = append(servers, &hcloud.Server{
+		Status: hcloud.ServerStatusRunning,
+		Name:   "Test2",
+	})
+
+	expectedError := "Instance Test has no attached IP"
+	_, err := GetAllIps(servers)
+	if err == nil {
+		t.Error("GetAllIps did not error with missing data")
+	}
+	if err.Error() != expectedError {
+		t.Errorf("Wrong error message. want %s, got %s", expectedError, err.Error())
+	}
+
+}

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
+}

internal/utils/logging.go

@@ -0,0 +1,28 @@
+package utils
+
+import (
+	"os"
+
+	"git.uploadfilter24.eu/covidnetes/mail-dns-service/internal"
+	log "github.com/sirupsen/logrus"
+)
+
+func ConfigureLogger(cfg *internal.Config) {
+
+	switch cfg.LogLevel {
+	case "Debug":
+		log.SetLevel(log.DebugLevel)
+	case "Info":
+		log.SetLevel(log.InfoLevel)
+	case "Warn":
+		log.SetLevel(log.WarnLevel)
+	case "Error":
+		log.SetLevel(log.ErrorLevel)
+	default:
+		log.SetLevel(log.InfoLevel)
+		log.Warnf("Home: invalid log level supplied: '%s'", cfg.LogLevel)
+	}
+
+	log.SetFormatter(&log.JSONFormatter{})
+	log.SetOutput(os.Stdout)
+}