[spike] Pull based model to get HelmRelease events

.gitignore

@@ -27,4 +27,6 @@ testbin/*
 # credentials used for accessing GitHub during container build
 .netrc
 # helm package with version
-pipeline-controller-*.tgz
+pipeline-controller-*.tgz
+
+.tool-versions

config/rbac/role.yaml

@@ -5,6 +5,22 @@ metadata:
   creationTimestamp: null
   name: pipeline-controller
 rules:
+- apiGroups:
+  - ""
+  resources:
+  - secrets
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - cluster.x-k8s.io
+  resources:
+  - clusters
+  verbs:
+  - get
+  - list
+  - watch
 - apiGroups:
   - ""
   resources:
@@ -18,9 +34,27 @@ rules:
   resources:
   - gitopsclusters
   verbs:
+  - create
+  - delete
   - get
   - list
+  - patch
+  - update
   - watch
+- apiGroups:
+  - gitops.weave.works
+  resources:
+  - gitopsclusters/finalizers
+  verbs:
+  - update
+- apiGroups:
+  - gitops.weave.works
+  resources:
+  - gitopsclusters/status
+  verbs:
+  - get
+  - patch
+  - update
 - apiGroups:
   - pipelines.weave.works
   resources:

controllers/gitopscluster_controller.go

@@ -0,0 +1,316 @@
+package controllers
+
+/*
+Copyright 2022.
+
+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.
+*/
+
+import (
+	"context"
+	"crypto/md5"
+	"errors"
+	"fmt"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+
+	gitopsv1alpha1 "github.com/weaveworks/cluster-controller/api/v1alpha1"
+	"github.com/weaveworks/pipeline-controller/pkg/gitopscluster"
+)
+
+const (
+	// SecretNameIndexKey is the key used for indexing secret
+	// resources based on their name.
+	SecretNameIndexKey string = "SecretNameIndexKey"
+	// CAPIClusterNameIndexKey is the key used for indexing CAPI cluster
+	// resources based on their name.
+	CAPIClusterNameIndexKey string = "CAPIClusterNameIndexKey"
+
+	// MissingSecretRequeueTime is the period after which a secret will be
+	// checked if it doesn't exist.
+	MissingSecretRequeueTime = time.Second * 30
+
+	// SecretChecksumKey is the key used to store the checksum of the secret
+	SecretChecksumKey string = "gitops.weave.works/secret-checksum"
+
+	// GitopsClusterFinalizer is the finalizer used by Pipeline controller
+	GitopsClusterFinalizer string = "gitops.weave.works/pipelines"
+)
+
+// GitopsClusterReconciler reconciles a GitopsCluster object
+type GitopsClusterReconciler struct {
+	client.Client
+	Scheme         *runtime.Scheme
+	clientsManager gitopscluster.RestConfigManager
+}
+
+// NewGitopsClusterReconciler creates and returns a configured
+// reconciler ready for use.
+func NewGitopsClusterReconciler(c client.Client, s *runtime.Scheme, clientsManager gitopscluster.RestConfigManager) *GitopsClusterReconciler {
+	return &GitopsClusterReconciler{
+		Client:         c,
+		Scheme:         s,
+		clientsManager: clientsManager,
+	}
+}
+
+// +kubebuilder:rbac:groups=gitops.weave.works,resources=gitopsclusters,verbs=get;list;watch;create;update;patch;delete
+// +kubebuilder:rbac:groups=gitops.weave.works,resources=gitopsclusters/status,verbs=get;update;patch
+// +kubebuilder:rbac:groups=gitops.weave.works,resources=gitopsclusters/finalizers,verbs=update
+// +kubebuilder:rbac:groups="",resources=secrets,verbs=get;watch;list
+// +kubebuilder:rbac:groups="cluster.x-k8s.io",resources=clusters,verbs=get;watch;list
+
+// Reconcile is part of the main kubernetes reconciliation loop which aims to
+// move the current state of the cluster closer to the desired state.
+func (r *GitopsClusterReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	// Fetch the Cluster
+	cluster := &gitopsv1alpha1.GitopsCluster{}
+	if err := r.Get(ctx, req.NamespacedName, cluster); err != nil {
+		return ctrl.Result{}, client.IgnoreNotFound(err)
+	}
+
+	// examine DeletionTimestamp to determine if object is under deletion
+	if cluster.ObjectMeta.DeletionTimestamp.IsZero() {
+		if !controllerutil.ContainsFinalizer(cluster, GitopsClusterFinalizer) {
+			controllerutil.AddFinalizer(cluster, GitopsClusterFinalizer)
+			if err := r.Update(ctx, cluster); err != nil {
+				return ctrl.Result{}, err
+			}
+		}
+	} else {
+		// The object is being deleted
+		if controllerutil.ContainsFinalizer(cluster, GitopsClusterFinalizer) {
+			r.clientsManager.Delete(cluster.Name, cluster.Namespace)
+
+			// remove our finalizer from the list and update it.
+			controllerutil.RemoveFinalizer(cluster, GitopsClusterFinalizer)
+			if err := r.Update(ctx, cluster); err != nil {
+				return ctrl.Result{}, err
+			}
+		}
+
+		// Stop reconciliation as the item is being deleted
+		return ctrl.Result{}, nil
+	}
+
+	secretData, err := r.restConfigSecretData(ctx, cluster)
+	if err != nil {
+		return ctrl.Result{}, client.IgnoreNotFound(err)
+	}
+	secretMd5 := fmt.Sprintf("%x", md5.Sum(secretData))
+
+	if cluster.Annotations[SecretChecksumKey] == secretMd5 {
+		_, err := r.clientsManager.Get(cluster.Name, cluster.Namespace)
+		if err == nil {
+			return ctrl.Result{}, nil
+		}
+
+		client, err := r.getClusterRestConfig(ctx, cluster)
+		if err != nil {
+			return ctrl.Result{}, fmt.Errorf("failed to get cluster client cluster=%s namespace=%s: %w", cluster.Name, cluster.Namespace, err)
+		}
+
+		r.clientsManager.Add(cluster.Name, cluster.Namespace, client)
+		return ctrl.Result{}, nil
+	}
+
+	if cluster.Annotations == nil {
+		cluster.Annotations = map[string]string{}
+	}
+
+	cluster.Annotations[SecretChecksumKey] = secretMd5
+
+	if err := r.Update(ctx, cluster); err != nil {
+		return ctrl.Result{}, fmt.Errorf("failed to update cluster secret checksum cluster=%s namespace=%s: %w", cluster.Name, cluster.Namespace, err)
+	}
+
+	client, err := r.getClusterRestConfig(ctx, cluster)
+	if err != nil {
+		return ctrl.Result{}, fmt.Errorf("failed to get cluster client cluster=%s namespace=%s: %w", cluster.Name, cluster.Namespace, err)
+	}
+
+	r.clientsManager.Add(cluster.Name, cluster.Namespace, client)
+	return ctrl.Result{}, nil
+}
+
+// SetupWithManager sets up the controller with the Manager.
+func (r *GitopsClusterReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	if err := mgr.GetCache().IndexField(context.TODO(), &gitopsv1alpha1.GitopsCluster{}, SecretNameIndexKey, r.indexGitopsClusterBySecretName); err != nil {
+		return fmt.Errorf("failed setting index fields: %w", err)
+	}
+
+	if err := mgr.GetCache().IndexField(context.TODO(), &gitopsv1alpha1.GitopsCluster{}, CAPIClusterNameIndexKey, r.indexGitopsClusterByCAPIClusterName); err != nil {
+		return fmt.Errorf("failed setting index fields: %w", err)
+	}
+
+	builder := ctrl.NewControllerManagedBy(mgr).
+		For(&gitopsv1alpha1.GitopsCluster{}).
+		Watches(
+			&source.Kind{Type: &corev1.Secret{}},
+			handler.EnqueueRequestsFromMapFunc(r.requestsForSecretChange),
+		)
+
+	return builder.Complete(r)
+}
+
+func (r *GitopsClusterReconciler) indexGitopsClusterBySecretName(o client.Object) []string {
+	c, ok := o.(*gitopsv1alpha1.GitopsCluster)
+	if !ok {
+		panic(fmt.Sprintf("Expected a GitopsCluster, got %T", o))
+	}
+
+	if c.Spec.SecretRef != nil {
+		return []string{c.Spec.SecretRef.Name}
+	}
+
+	return nil
+}
+
+func (r *GitopsClusterReconciler) indexGitopsClusterByCAPIClusterName(o client.Object) []string {
+	c, ok := o.(*gitopsv1alpha1.GitopsCluster)
+	if !ok {
+		panic(fmt.Sprintf("Expected a GitopsCluster, got %T", o))
+	}
+
+	if c.Spec.CAPIClusterRef != nil {
+		return []string{c.Spec.CAPIClusterRef.Name}
+	}
+
+	return nil
+}
+
+func (r *GitopsClusterReconciler) requestsForSecretChange(o client.Object) []ctrl.Request {
+	secret, ok := o.(*corev1.Secret)
+	if !ok {
+		panic(fmt.Sprintf("Expected a Secret but got a %T", o))
+	}
+
+	ctx := context.Background()
+	var list gitopsv1alpha1.GitopsClusterList
+	if err := r.Client.List(ctx, &list, client.MatchingFields{SecretNameIndexKey: secret.GetName()}); err != nil {
+		return nil
+	}
+
+	var reqs []ctrl.Request
+	for _, i := range list.Items {
+		name := client.ObjectKey{Namespace: i.Namespace, Name: i.Name}
+		reqs = append(reqs, ctrl.Request{NamespacedName: name})
+	}
+	return reqs
+}
+
+func (r *GitopsClusterReconciler) requestsForCAPIClusterChange(o client.Object) []ctrl.Request {
+	cluster, ok := o.(*clusterv1.Cluster)
+	if !ok {
+		panic(fmt.Sprintf("Expected a CAPI Cluster but got a %T", o))
+	}
+
+	ctx := context.Background()
+	var list gitopsv1alpha1.GitopsClusterList
+	if err := r.Client.List(ctx, &list, client.MatchingFields{CAPIClusterNameIndexKey: cluster.GetName()}); err != nil {
+		return nil
+	}
+
+	var reqs []ctrl.Request
+	for _, i := range list.Items {
+		name := client.ObjectKey{Namespace: i.Namespace, Name: i.Name}
+		reqs = append(reqs, ctrl.Request{NamespacedName: name})
+	}
+	return reqs
+}
+
+func (r *GitopsClusterReconciler) getClusterRestConfig(ctx context.Context, cluster *gitopsv1alpha1.GitopsCluster) (*rest.Config, error) {
+	config, err := r.restConfigFromSecret(ctx, cluster)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get rest config from secret: %w", err)
+	}
+
+	return config, nil
+}
+
+func (r *GitopsClusterReconciler) restConfigFromSecret(ctx context.Context, cluster *gitopsv1alpha1.GitopsCluster) (*rest.Config, error) {
+	log := log.FromContext(ctx)
+
+	data, err := r.restConfigSecretData(ctx, cluster)
+	if err != nil {
+		return nil, err
+	}
+
+	restCfg, err := clientcmd.RESTConfigFromKubeConfig(data)
+	if err != nil {
+		log.Error(err, "unable to create kubconfig from GitOps Cluster secret data", "cluster", cluster.Name)
+
+		return nil, err
+	}
+
+	return restCfg, nil
+}
+
+func (r *GitopsClusterReconciler) restConfigSecretData(ctx context.Context, cluster *gitopsv1alpha1.GitopsCluster) ([]byte, error) {
+	log := log.FromContext(ctx)
+
+	var secretRef string
+
+	if cluster.Spec.CAPIClusterRef != nil {
+		secretRef = fmt.Sprintf("%s-kubeconfig", cluster.Spec.CAPIClusterRef.Name)
+	}
+
+	if secretRef == "" && cluster.Spec.SecretRef != nil {
+		secretRef = cluster.Spec.SecretRef.Name
+	}
+
+	if secretRef == "" {
+		return nil, errors.New("no secret ref found")
+	}
+
+	key := types.NamespacedName{
+		Name:      secretRef,
+		Namespace: cluster.Namespace,
+	}
+
+	var secret v1.Secret
+	if err := r.Get(ctx, key, &secret); err != nil {
+		log.Error(err, "unable to fetch secret for GitOps Cluster", "cluster", cluster.Name)
+
+		return nil, err
+	}
+
+	var data []byte
+
+	for k := range secret.Data {
+		if k == "value" || k == "value.yaml" {
+			data = secret.Data[k]
+
+			break
+		}
+	}
+
+	if len(data) == 0 {
+		return nil, errors.New("no data present in cluster secret")
+	}
+
+	return data, nil
+}