|
| 1 | +/* |
| 2 | +Copyright 2026 The Kubernetes Authors |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package controller |
| 18 | + |
| 19 | +import ( |
| 20 | + "context" |
| 21 | + "fmt" |
| 22 | + |
| 23 | + corev1 "k8s.io/api/core/v1" |
| 24 | + apierrors "k8s.io/apimachinery/pkg/api/errors" |
| 25 | + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 26 | + "sigs.k8s.io/controller-runtime/pkg/client" |
| 27 | + "sigs.k8s.io/controller-runtime/pkg/controller/controllerutil" |
| 28 | + "sigs.k8s.io/controller-runtime/pkg/log" |
| 29 | + |
| 30 | + mcpv1alpha1 "github.com/kubernetes-sigs/mcp-lifecycle-operator/api/v1alpha1" |
| 31 | +) |
| 32 | + |
| 33 | +const ( |
| 34 | + // AnnotationAutoCreatePrerequisites controls whether the operator creates |
| 35 | + // missing ConfigMaps and ServiceAccounts referenced by the MCPServer CR. |
| 36 | + AnnotationAutoCreatePrerequisites = "mcp.x-k8s.io/auto-create-prerequisites" |
| 37 | + |
| 38 | + // eventActionPrerequisiteCreated is the reporting action when a prerequisite resource is auto-created. |
| 39 | + eventActionPrerequisiteCreated = "PrerequisiteCreated" |
| 40 | +) |
| 41 | + |
| 42 | +// ensurePrerequisites creates missing ServiceAccounts and ConfigMaps referenced |
| 43 | +// by the MCPServer when the auto-create-prerequisites annotation is set to "true". |
| 44 | +// Created resources are owned by the MCPServer so they are cleaned up on deletion. |
| 45 | +func (r *MCPServerReconciler) ensurePrerequisites(ctx context.Context, server *mcpv1alpha1.MCPServer) error { |
| 46 | + if server.Annotations[AnnotationAutoCreatePrerequisites] != "true" { |
| 47 | + return nil |
| 48 | + } |
| 49 | + |
| 50 | + logger := log.FromContext(ctx) |
| 51 | + logger.Info("Auto-creating prerequisites for MCPServer", "name", server.Name) |
| 52 | + |
| 53 | + if err := r.ensureServiceAccount(ctx, server); err != nil { |
| 54 | + return err |
| 55 | + } |
| 56 | + |
| 57 | + if err := r.ensureConfigMaps(ctx, server); err != nil { |
| 58 | + return err |
| 59 | + } |
| 60 | + |
| 61 | + return nil |
| 62 | +} |
| 63 | + |
| 64 | +// ensureServiceAccount creates the ServiceAccount referenced by |
| 65 | +// spec.runtime.security.serviceAccountName if it does not already exist. |
| 66 | +func (r *MCPServerReconciler) ensureServiceAccount(ctx context.Context, server *mcpv1alpha1.MCPServer) error { |
| 67 | + saName := server.Spec.Runtime.Security.ServiceAccountName |
| 68 | + if saName == "" { |
| 69 | + return nil |
| 70 | + } |
| 71 | + |
| 72 | + sa := &corev1.ServiceAccount{} |
| 73 | + err := r.Get(ctx, client.ObjectKey{Name: saName, Namespace: server.Namespace}, sa) |
| 74 | + if err == nil { |
| 75 | + // Already exists, nothing to do. |
| 76 | + return nil |
| 77 | + } |
| 78 | + if !apierrors.IsNotFound(err) { |
| 79 | + return fmt.Errorf("failed to check ServiceAccount %s: %w", saName, err) |
| 80 | + } |
| 81 | + |
| 82 | + sa = &corev1.ServiceAccount{ |
| 83 | + ObjectMeta: metav1.ObjectMeta{ |
| 84 | + Name: saName, |
| 85 | + Namespace: server.Namespace, |
| 86 | + }, |
| 87 | + } |
| 88 | + if err := controllerutil.SetControllerReference(server, sa, r.Scheme); err != nil { |
| 89 | + return fmt.Errorf("failed to set owner reference on ServiceAccount %s: %w", saName, err) |
| 90 | + } |
| 91 | + if err := r.Create(ctx, sa); err != nil { |
| 92 | + if apierrors.IsAlreadyExists(err) { |
| 93 | + return nil |
| 94 | + } |
| 95 | + return fmt.Errorf("failed to create ServiceAccount %s: %w", saName, err) |
| 96 | + } |
| 97 | + |
| 98 | + r.emitPrerequisiteCreated(server, "ServiceAccount", saName) |
| 99 | + return nil |
| 100 | +} |
| 101 | + |
| 102 | +// ensureConfigMaps creates any ConfigMaps referenced in spec.config.storage |
| 103 | +// that do not already exist. |
| 104 | +func (r *MCPServerReconciler) ensureConfigMaps(ctx context.Context, server *mcpv1alpha1.MCPServer) error { |
| 105 | + for i, storage := range server.Spec.Config.Storage { |
| 106 | + if storage.Source.Type != mcpv1alpha1.StorageTypeConfigMap { |
| 107 | + continue |
| 108 | + } |
| 109 | + if storage.Source.ConfigMap == nil { |
| 110 | + continue |
| 111 | + } |
| 112 | + |
| 113 | + cmName := storage.Source.ConfigMap.Name |
| 114 | + if cmName == "" { |
| 115 | + continue |
| 116 | + } |
| 117 | + |
| 118 | + cm := &corev1.ConfigMap{} |
| 119 | + err := r.Get(ctx, client.ObjectKey{Name: cmName, Namespace: server.Namespace}, cm) |
| 120 | + if err == nil { |
| 121 | + // Already exists, nothing to do. |
| 122 | + continue |
| 123 | + } |
| 124 | + if !apierrors.IsNotFound(err) { |
| 125 | + return fmt.Errorf("failed to check ConfigMap %s: %w", cmName, err) |
| 126 | + } |
| 127 | + |
| 128 | + cm = &corev1.ConfigMap{ |
| 129 | + ObjectMeta: metav1.ObjectMeta{ |
| 130 | + Name: cmName, |
| 131 | + Namespace: server.Namespace, |
| 132 | + }, |
| 133 | + Data: map[string]string{}, |
| 134 | + } |
| 135 | + if err := controllerutil.SetControllerReference(server, cm, r.Scheme); err != nil { |
| 136 | + return fmt.Errorf("failed to set owner reference on ConfigMap %s: %w", cmName, err) |
| 137 | + } |
| 138 | + if err := r.Create(ctx, cm); err != nil { |
| 139 | + if apierrors.IsAlreadyExists(err) { |
| 140 | + continue |
| 141 | + } |
| 142 | + return fmt.Errorf("failed to create ConfigMap %s at storage index %d: %w", cmName, i, err) |
| 143 | + } |
| 144 | + |
| 145 | + r.emitPrerequisiteCreated(server, "ConfigMap", cmName) |
| 146 | + } |
| 147 | + |
| 148 | + return nil |
| 149 | +} |
| 150 | + |
| 151 | +func (r *MCPServerReconciler) emitPrerequisiteCreated(server *mcpv1alpha1.MCPServer, kind, name string) { |
| 152 | + if r.Recorder == nil { |
| 153 | + return |
| 154 | + } |
| 155 | + r.Recorder.Eventf(server, nil, corev1.EventTypeNormal, "CreatedPrerequisite", |
| 156 | + eventActionPrerequisiteCreated, "Created %s %s for MCPServer %s", kind, name, server.Name) |
| 157 | +} |
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