initial commit

2026-04-13 00:40:35 +02:00
commit 168e9c6db2
63 changed files with 4270 additions and 0 deletions
--- a/internal/controller/resolution_controller.go
+++ b/internal/controller/resolution_controller.go
@@ -0,0 +1,146 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"net"
+	"slices"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	logf "sigs.k8s.io/controller-runtime/pkg/log"
+
+	dnsv1 "stinnesbeck.com/dns/api/v1"
+)
+
+// ResolutionReconciler reconciles a Resolution object
+type ResolutionReconciler struct {
+	client.Client
+	Scheme *runtime.Scheme
+}
+
+// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolutions,verbs=get;list;watch;create;update;patch;delete
+// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolutions/status,verbs=get;update;patch
+// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolutions/finalizers,verbs=update
+
+// Reconcile is part of the main kubernetes reconciliation loop which aims to
+// move the current state of the cluster closer to the desired state.
+// TODO(user): Modify the Reconcile function to compare the state specified by
+// the Resolution object against the actual cluster state, and then
+// perform operations to make the cluster state reflect the state specified by
+// the user.
+//
+// For more details, check Reconcile and its Result here:
+// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.23.3/pkg/reconcile
+func (r *ResolutionReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	log := logf.FromContext(ctx)
+
+	var resolution dnsv1.Resolution
+
+	switch err := r.Get(ctx, req.NamespacedName, &resolution); {
+	case apierrors.IsNotFound(err):
+		// resolution was deleted, this is expected
+		// exit reconcile loop here
+		return ctrl.Result{}, nil
+
+	case err != nil:
+		// an error occurred this is not expected
+		log.Error(err, "error while retrieving resolution")
+		return ctrl.Result{}, err
+	}
+
+	// Snapshot before mutation
+	patchBase := resolution.DeepCopy()
+
+	addrs, err := net.LookupHost(resolution.Spec.Address)
+	if err != nil {
+		log.Error(err, "error while resolving resolution")
+		return ctrl.Result{}, err
+	}
+
+	// Build new desired status (IMPORTANT: no append)
+	var ips []net.IP
+	for _, addr := range addrs {
+		if ip := net.ParseIP(addr); ip != nil {
+			ips = append(ips, ip)
+		}
+	}
+
+	slices.SortStableFunc(ips, func(a, b net.IP) int {
+		for i := range 15 {
+			if a[i] < b[i] {
+				return -1
+			}
+
+			if a[i] > b[i] {
+				return 1
+			}
+		}
+
+		return 0
+	})
+
+	// check if both ip address slices are the same
+	if slices.EqualFunc(patchBase.Status.IPAddresses, ips, func(s1, s2 net.IP) bool {
+		return bytes.Equal(s1, s2)
+	}) {
+		return ctrl.Result{}, nil
+	}
+
+	log.Info(fmt.Sprintf("found the following IP addresses: %v", ips))
+
+	resolution.Status.IPAddresses = ips
+
+	// Only patch status (clean + minimal diff)
+	if err := r.Status().Patch(
+		ctx,
+		&resolution,
+		client.MergeFrom(patchBase),
+	); err != nil {
+		return ctrl.Result{}, err
+	}
+
+	return ctrl.Result{}, nil
+
+	// if err := r.Patch(ctx, &resolution, client.Merge); err != nil {
+	// 	return ctrl.Result{}, err
+	// }
+
+	// r := &net.Resolver{
+	// 	PreferGo: true,
+	// 	Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+	// 		d := net.Dialer{
+	// 			Timeout: time.Millisecond * time.Duration(10000),
+	// 		}
+	// 		return d.DialContext(ctx, network, "8.8.8.8:53")
+	// 	},
+	// }
+	// ip, _ := r.LookupHost(context.Background(), "www.google.com")
+}
+
+// SetupWithManager sets up the controller with the Manager.
+func (r *ResolutionReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&dnsv1.Resolution{}).
+		Named("resolution").
+		Complete(r)
+}
--- a/internal/controller/resolution_controller_test.go
+++ b/internal/controller/resolution_controller_test.go
@@ -0,0 +1,84 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"context"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	dnsv1 "stinnesbeck.com/dns/api/v1"
+)
+
+var _ = Describe("Resolution Controller", func() {
+	Context("When reconciling a resource", func() {
+		const resourceName = "test-resource"
+
+		ctx := context.Background()
+
+		typeNamespacedName := types.NamespacedName{
+			Name:      resourceName,
+			Namespace: "default", // TODO(user):Modify as needed
+		}
+		resolution := &dnsv1.Resolution{}
+
+		BeforeEach(func() {
+			By("creating the custom resource for the Kind Resolution")
+			err := k8sClient.Get(ctx, typeNamespacedName, resolution)
+			if err != nil && errors.IsNotFound(err) {
+				resource := &dnsv1.Resolution{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:      resourceName,
+						Namespace: "default",
+					},
+					// TODO(user): Specify other spec details if needed.
+				}
+				Expect(k8sClient.Create(ctx, resource)).To(Succeed())
+			}
+		})
+
+		AfterEach(func() {
+			// TODO(user): Cleanup logic after each test, like removing the resource instance.
+			resource := &dnsv1.Resolution{}
+			err := k8sClient.Get(ctx, typeNamespacedName, resource)
+			Expect(err).NotTo(HaveOccurred())
+
+			By("Cleanup the specific resource instance Resolution")
+			Expect(k8sClient.Delete(ctx, resource)).To(Succeed())
+		})
+		It("should successfully reconcile the resource", func() {
+			By("Reconciling the created resource")
+			controllerReconciler := &ResolutionReconciler{
+				Client: k8sClient,
+				Scheme: k8sClient.Scheme(),
+			}
+
+			_, err := controllerReconciler.Reconcile(ctx, reconcile.Request{
+				NamespacedName: typeNamespacedName,
+			})
+			Expect(err).NotTo(HaveOccurred())
+			// TODO(user): Add more specific assertions depending on your controller's reconciliation logic.
+			// Example: If you expect a certain status condition after reconciliation, verify it here.
+		})
+	})
+})
--- a/internal/controller/resolver_controller.go
+++ b/internal/controller/resolver_controller.go
@@ -0,0 +1,93 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"context"
+	"errors"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	logf "sigs.k8s.io/controller-runtime/pkg/log"
+
+	dnsv1 "stinnesbeck.com/dns/api/v1"
+)
+
+var (
+	ErrIPAddressNotValid = errors.New("IP Address is not valid")
+)
+
+// ResolverReconciler reconciles a Resolver object
+type ResolverReconciler struct {
+	client.Client
+	Scheme *runtime.Scheme
+}
+
+// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolvers,verbs=get;list;watch;create;update;patch;delete
+// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolvers/status,verbs=get;update;patch
+// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolvers/finalizers,verbs=update
+
+// Reconcile is part of the main kubernetes reconciliation loop which aims to
+// move the current state of the cluster closer to the desired state.
+// TODO(user): Modify the Reconcile function to compare the state specified by
+// the Resolver object against the actual cluster state, and then
+// perform operations to make the cluster state reflect the state specified by
+// the user.
+//
+// For more details, check Reconcile and its Result here:
+// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.23.3/pkg/reconcile
+func (r *ResolverReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	log := logf.FromContext(ctx)
+
+	var resolver dnsv1.Resolver
+
+	switch err := r.Get(ctx, req.NamespacedName, &resolver); {
+	case apierrors.IsNotFound(err):
+		// resolver was deleted, this is expected
+		// exit reconcile loop here
+		return ctrl.Result{}, nil
+
+	case err != nil:
+		// an error occurred this is not expected
+		log.Error(err, "error while retrieving resolver")
+		return ctrl.Result{}, err
+	}
+
+	// TODO(user): your logic here
+	switch {
+	case len(resolver.Spec.IPAddress) == 0:
+		// IPAddress is not a valid IP
+		return ctrl.Result{}, ErrIPAddressNotValid
+
+	case len(resolver.Spec.IPAddress.To4()) == 4:
+		// IP is IPv4
+	case len(resolver.Spec.IPAddress.To16()) == 16:
+		// IP is IPv6
+	}
+
+	return ctrl.Result{}, nil
+}
+
+// SetupWithManager sets up the controller with the Manager.
+func (r *ResolverReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&dnsv1.Resolver{}).
+		Named("resolver").
+		Complete(r)
+}
--- a/internal/controller/resolver_controller_test.go
+++ b/internal/controller/resolver_controller_test.go
@@ -0,0 +1,84 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"context"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	dnsv1 "stinnesbeck.com/dns/api/v1"
+)
+
+var _ = Describe("Resolver Controller", func() {
+	Context("When reconciling a resource", func() {
+		const resourceName = "test-resource"
+
+		ctx := context.Background()
+
+		typeNamespacedName := types.NamespacedName{
+			Name:      resourceName,
+			Namespace: "default", // TODO(user):Modify as needed
+		}
+		resolver := &dnsv1.Resolver{}
+
+		BeforeEach(func() {
+			By("creating the custom resource for the Kind Resolver")
+			err := k8sClient.Get(ctx, typeNamespacedName, resolver)
+			if err != nil && errors.IsNotFound(err) {
+				resource := &dnsv1.Resolver{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:      resourceName,
+						Namespace: "default",
+					},
+					// TODO(user): Specify other spec details if needed.
+				}
+				Expect(k8sClient.Create(ctx, resource)).To(Succeed())
+			}
+		})
+
+		AfterEach(func() {
+			// TODO(user): Cleanup logic after each test, like removing the resource instance.
+			resource := &dnsv1.Resolver{}
+			err := k8sClient.Get(ctx, typeNamespacedName, resource)
+			Expect(err).NotTo(HaveOccurred())
+
+			By("Cleanup the specific resource instance Resolver")
+			Expect(k8sClient.Delete(ctx, resource)).To(Succeed())
+		})
+		It("should successfully reconcile the resource", func() {
+			By("Reconciling the created resource")
+			controllerReconciler := &ResolverReconciler{
+				Client: k8sClient,
+				Scheme: k8sClient.Scheme(),
+			}
+
+			_, err := controllerReconciler.Reconcile(ctx, reconcile.Request{
+				NamespacedName: typeNamespacedName,
+			})
+			Expect(err).NotTo(HaveOccurred())
+			// TODO(user): Add more specific assertions depending on your controller's reconciliation logic.
+			// Example: If you expect a certain status condition after reconciliation, verify it here.
+		})
+	})
+})
--- a/internal/controller/suite_test.go
+++ b/internal/controller/suite_test.go
@@ -0,0 +1,118 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
+	"k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/rest"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/envtest"
+	logf "sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/log/zap"
+
+	dnsv1 "stinnesbeck.com/dns/api/v1"
+	// +kubebuilder:scaffold:imports
+)
+
+// These tests use Ginkgo (BDD-style Go testing framework). Refer to
+// http://onsi.github.io/ginkgo/ to learn more about Ginkgo.
+
+var (
+	ctx       context.Context
+	cancel    context.CancelFunc
+	testEnv   *envtest.Environment
+	cfg       *rest.Config
+	k8sClient client.Client
+)
+
+func TestControllers(t *testing.T) {
+	RegisterFailHandler(Fail)
+
+	RunSpecs(t, "Controller Suite")
+}
+
+var _ = BeforeSuite(func() {
+	logf.SetLogger(zap.New(zap.WriteTo(GinkgoWriter), zap.UseDevMode(true)))
+
+	ctx, cancel = context.WithCancel(context.TODO())
+
+	var err error
+	err = dnsv1.AddToScheme(scheme.Scheme)
+	Expect(err).NotTo(HaveOccurred())
+
+	// +kubebuilder:scaffold:scheme
+
+	By("bootstrapping test environment")
+	testEnv = &envtest.Environment{
+		CRDDirectoryPaths:     []string{filepath.Join("..", "..", "config", "crd", "bases")},
+		ErrorIfCRDPathMissing: true,
+	}
+
+	// Retrieve the first found binary directory to allow running tests from IDEs
+	if getFirstFoundEnvTestBinaryDir() != "" {
+		testEnv.BinaryAssetsDirectory = getFirstFoundEnvTestBinaryDir()
+	}
+
+	// cfg is defined in this file globally.
+	cfg, err = testEnv.Start()
+	Expect(err).NotTo(HaveOccurred())
+	Expect(cfg).NotTo(BeNil())
+
+	k8sClient, err = client.New(cfg, client.Options{Scheme: scheme.Scheme})
+	Expect(err).NotTo(HaveOccurred())
+	Expect(k8sClient).NotTo(BeNil())
+})
+
+var _ = AfterSuite(func() {
+	By("tearing down the test environment")
+	cancel()
+	Eventually(func() error {
+		return testEnv.Stop()
+	}, time.Minute, time.Second).Should(Succeed())
+})
+
+// getFirstFoundEnvTestBinaryDir locates the first binary in the specified path.
+// ENVTEST-based tests depend on specific binaries, usually located in paths set by
+// controller-runtime. When running tests directly (e.g., via an IDE) without using
+// Makefile targets, the 'BinaryAssetsDirectory' must be explicitly configured.
+//
+// This function streamlines the process by finding the required binaries, similar to
+// setting the 'KUBEBUILDER_ASSETS' environment variable. To ensure the binaries are
+// properly set up, run 'make setup-envtest' beforehand.
+func getFirstFoundEnvTestBinaryDir() string {
+	basePath := filepath.Join("..", "..", "bin", "k8s")
+	entries, err := os.ReadDir(basePath)
+	if err != nil {
+		logf.Log.Error(err, "Failed to read directory", "path", basePath)
+		return ""
+	}
+	for _, entry := range entries {
+		if entry.IsDir() {
+			return filepath.Join(basePath, entry.Name())
+		}
+	}
+	return ""
+}