Implement group resource (#181)

This change implements a new group resource. 

It also sets the standard for a resource reference will be done through
out the controller. A resource reference can either be done by ID or as
a local named reference to the actual resource. This allows end users to
chose if they want to manage things completely in the cluster or not.

Part of #172

Signed-off-by: Philip Laine <philip.laine@gmail.com>

internal/controller/group_controller_test.go

@@ -0,0 +1,139 @@
+package controller
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"math/rand"
+	"net/http"
+	"net/http/httptest"
+
+	netbird "github.com/netbirdio/netbird/shared/management/client/rest"
+	"github.com/netbirdio/netbird/shared/management/http/api"
+	"github.com/netbirdio/netbird/shared/management/http/util"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	kerrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+
+	nbv1alpha1 "github.com/netbirdio/kubernetes-operator/api/v1alpha1"
+)
+
+var _ = Describe("Group Controller", func() {
+	Context("When reconciling a resource", func() {
+		ctx := context.Background()
+
+		r := rand.New(rand.NewSource(GinkgoRandomSeed()))
+		groupStore := map[string]*api.Group{}
+		mux := &http.ServeMux{}
+		mux.Handle("POST /api/groups", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+			b, err := io.ReadAll(req.Body)
+			Expect(err).NotTo(HaveOccurred())
+			groupReq := api.GroupRequest{}
+			err = json.Unmarshal(b, &groupReq)
+			Expect(err).NotTo(HaveOccurred())
+
+			groupResp := &api.Group{
+				Id:   fmt.Sprintf("id-%d", r.Int63()),
+				Name: groupReq.Name,
+			}
+			groupStore[groupResp.Id] = groupResp
+			b, err = json.Marshal(groupResp)
+			Expect(err).NotTo(HaveOccurred())
+			_, err = rw.Write(b)
+			Expect(err).NotTo(HaveOccurred())
+		}))
+		mux.Handle("PUT /api/groups/{id}", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+			id := req.PathValue("id")
+			groupResp, ok := groupStore[id]
+			if !ok {
+				util.WriteErrorResponse("Not Found", http.StatusNotFound, rw)
+				return
+			}
+
+			b, err := io.ReadAll(req.Body)
+			Expect(err).NotTo(HaveOccurred())
+			groupReq := api.GroupRequest{}
+			err = json.Unmarshal(b, &groupReq)
+			Expect(err).NotTo(HaveOccurred())
+
+			groupResp.Name = groupReq.Name
+
+			b, err = json.Marshal(groupResp)
+			Expect(err).NotTo(HaveOccurred())
+			_, err = rw.Write(b)
+			Expect(err).NotTo(HaveOccurred())
+		}))
+		mux.Handle("DELETE /api/groups/{id}", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+			id := req.PathValue("id")
+			_, ok := groupStore[id]
+			if !ok {
+				util.WriteErrorResponse("Not Found", http.StatusNotFound, rw)
+				return
+			}
+			delete(groupStore, id)
+		}))
+		server := httptest.NewServer(mux)
+		nbClient := netbird.New(server.URL, "ABC")
+
+		var controllerReconciler *GroupReconciler
+		nn := client.ObjectKey{
+			Name:      "test-resource",
+			Namespace: "default",
+		}
+
+		BeforeEach(func() {
+			controllerReconciler = &GroupReconciler{
+				Client:  k8sClient,
+				Netbird: nbClient,
+			}
+		})
+
+		AfterEach(func() {
+			groupStore = map[string]*api.Group{}
+
+			group := &nbv1alpha1.Group{}
+			err := k8sClient.Get(ctx, nn, group)
+			if kerrors.IsNotFound(err) {
+				return
+			}
+			Expect(err).ToNot(HaveOccurred())
+			Expect(k8sClient.Delete(ctx, group)).To(Succeed())
+			_, err = controllerReconciler.Reconcile(ctx, reconcile.Request{NamespacedName: nn})
+			Expect(err).ToNot(HaveOccurred())
+		})
+
+		It("ensures a Netbird group exists on reconcile", func() {
+			group := &nbv1alpha1.Group{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      nn.Name,
+					Namespace: nn.Namespace,
+				},
+				Spec: nbv1alpha1.GroupSpec{
+					Name: "foobar",
+				},
+			}
+			Expect(k8sClient.Create(ctx, group)).To(Succeed())
+
+			By("creating a group on initial creation")
+			_, err := controllerReconciler.Reconcile(ctx, reconcile.Request{NamespacedName: nn})
+			Expect(err).NotTo(HaveOccurred())
+			err = k8sClient.Get(ctx, nn, group)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(*group.Status.GroupID).NotTo(BeEmpty())
+
+			By("crerating a new group when deleted from API")
+			delete(groupStore, *group.Status.GroupID)
+			_, err = controllerReconciler.Reconcile(ctx, reconcile.Request{NamespacedName: nn})
+			Expect(err).NotTo(HaveOccurred())
+			newGroup := &nbv1alpha1.Group{}
+			err = k8sClient.Get(ctx, nn, newGroup)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(*newGroup.Status.GroupID).NotTo(BeEmpty())
+			Expect(*newGroup.Status.GroupID).NotTo(Equal(*group.Status.GroupID))
+		})
+	})
+})