|
| 1 | +package controllers |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "os" |
| 7 | + "strconv" |
| 8 | + |
| 9 | + "k8s.io/apimachinery/pkg/api/equality" |
| 10 | + "k8s.io/apimachinery/pkg/api/errors" |
| 11 | + "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" |
| 12 | + "k8s.io/apimachinery/pkg/runtime/schema" |
| 13 | + "k8s.io/apimachinery/pkg/types" |
| 14 | + "sigs.k8s.io/controller-runtime/pkg/log" |
| 15 | + |
| 16 | + mcpv1alpha1 "github.com/stacklok/toolhive/cmd/thv-operator/api/v1alpha1" |
| 17 | +) |
| 18 | + |
| 19 | +// kagentToolServerGVK defines the GroupVersionKind for kagent ToolServer |
| 20 | +var kagentToolServerGVK = schema.GroupVersionKind{ |
| 21 | + Group: "kagent.dev", |
| 22 | + Version: "v1alpha1", |
| 23 | + Kind: "ToolServer", |
| 24 | +} |
| 25 | + |
| 26 | +// Constants for kagent config types |
| 27 | +const ( |
| 28 | + kagentConfigTypeSSE = "sse" |
| 29 | + kagentConfigTypeStreamableHTTP = "streamableHttp" |
| 30 | +) |
| 31 | + |
| 32 | +// isKagentIntegrationEnabled checks if kagent integration is enabled via environment variable |
| 33 | +func isKagentIntegrationEnabled() bool { |
| 34 | + enabled := os.Getenv("KAGENT_INTEGRATION_ENABLED") |
| 35 | + if enabled == "" { |
| 36 | + return false |
| 37 | + } |
| 38 | + result, err := strconv.ParseBool(enabled) |
| 39 | + if err != nil { |
| 40 | + return false |
| 41 | + } |
| 42 | + return result |
| 43 | +} |
| 44 | + |
| 45 | +// ensureKagentToolServer ensures a kagent ToolServer resource exists for the ToolHive MCPServer |
| 46 | +func (r *MCPServerReconciler) ensureKagentToolServer(ctx context.Context, mcpServer *mcpv1alpha1.MCPServer) error { |
| 47 | + logger := log.FromContext(ctx) |
| 48 | + |
| 49 | + // Check if kagent integration is enabled |
| 50 | + if !isKagentIntegrationEnabled() { |
| 51 | + // If not enabled, ensure any existing kagent ToolServer is deleted |
| 52 | + return r.deleteKagentToolServer(ctx, mcpServer) |
| 53 | + } |
| 54 | + |
| 55 | + // Create the kagent ToolServer object |
| 56 | + kagentToolServer := r.createKagentToolServerObject(mcpServer) |
| 57 | + |
| 58 | + // Check if the kagent ToolServer already exists |
| 59 | + existing := &unstructured.Unstructured{} |
| 60 | + existing.SetGroupVersionKind(kagentToolServerGVK) |
| 61 | + err := r.Get(ctx, types.NamespacedName{ |
| 62 | + Name: kagentToolServer.GetName(), |
| 63 | + Namespace: kagentToolServer.GetNamespace(), |
| 64 | + }, existing) |
| 65 | + |
| 66 | + if errors.IsNotFound(err) { |
| 67 | + // Create the kagent ToolServer |
| 68 | + logger.Info("Creating kagent ToolServer", |
| 69 | + "name", kagentToolServer.GetName(), |
| 70 | + "namespace", kagentToolServer.GetNamespace()) |
| 71 | + if err := r.Create(ctx, kagentToolServer); err != nil { |
| 72 | + return fmt.Errorf("failed to create kagent ToolServer: %w", err) |
| 73 | + } |
| 74 | + return nil |
| 75 | + } else if err != nil { |
| 76 | + return fmt.Errorf("failed to get kagent ToolServer: %w", err) |
| 77 | + } |
| 78 | + |
| 79 | + // Update the kagent ToolServer if needed |
| 80 | + existingSpec, _, _ := unstructured.NestedMap(existing.Object, "spec") |
| 81 | + desiredSpec, _, _ := unstructured.NestedMap(kagentToolServer.Object, "spec") |
| 82 | + |
| 83 | + if !equality.Semantic.DeepEqual(existingSpec, desiredSpec) { |
| 84 | + logger.Info("Updating kagent ToolServer", |
| 85 | + "name", kagentToolServer.GetName(), |
| 86 | + "namespace", kagentToolServer.GetNamespace()) |
| 87 | + existing.Object["spec"] = kagentToolServer.Object["spec"] |
| 88 | + if err := r.Update(ctx, existing); err != nil { |
| 89 | + return fmt.Errorf("failed to update kagent ToolServer: %w", err) |
| 90 | + } |
| 91 | + } |
| 92 | + |
| 93 | + return nil |
| 94 | +} |
| 95 | + |
| 96 | +// deleteKagentToolServer deletes the kagent ToolServer if it exists |
| 97 | +func (r *MCPServerReconciler) deleteKagentToolServer(ctx context.Context, mcpServer *mcpv1alpha1.MCPServer) error { |
| 98 | + logger := log.FromContext(ctx) |
| 99 | + |
| 100 | + kagentToolServer := &unstructured.Unstructured{} |
| 101 | + kagentToolServer.SetGroupVersionKind(kagentToolServerGVK) |
| 102 | + kagentToolServer.SetName(fmt.Sprintf("toolhive-%s", mcpServer.Name)) |
| 103 | + kagentToolServer.SetNamespace(mcpServer.Namespace) |
| 104 | + |
| 105 | + err := r.Get(ctx, types.NamespacedName{ |
| 106 | + Name: kagentToolServer.GetName(), |
| 107 | + Namespace: kagentToolServer.GetNamespace(), |
| 108 | + }, kagentToolServer) |
| 109 | + |
| 110 | + if errors.IsNotFound(err) { |
| 111 | + // Already deleted |
| 112 | + return nil |
| 113 | + } else if err != nil { |
| 114 | + return fmt.Errorf("failed to get kagent ToolServer for deletion: %w", err) |
| 115 | + } |
| 116 | + |
| 117 | + logger.Info("Deleting kagent ToolServer", |
| 118 | + "name", kagentToolServer.GetName(), |
| 119 | + "namespace", kagentToolServer.GetNamespace()) |
| 120 | + if err := r.Delete(ctx, kagentToolServer); err != nil && !errors.IsNotFound(err) { |
| 121 | + return fmt.Errorf("failed to delete kagent ToolServer: %w", err) |
| 122 | + } |
| 123 | + |
| 124 | + return nil |
| 125 | +} |
| 126 | + |
| 127 | +// createKagentToolServerObject creates an unstructured kagent ToolServer object |
| 128 | +func (*MCPServerReconciler) createKagentToolServerObject(mcpServer *mcpv1alpha1.MCPServer) *unstructured.Unstructured { |
| 129 | + kagentToolServer := &unstructured.Unstructured{} |
| 130 | + kagentToolServer.SetGroupVersionKind(kagentToolServerGVK) |
| 131 | + kagentToolServer.SetName(fmt.Sprintf("toolhive-%s", mcpServer.Name)) |
| 132 | + kagentToolServer.SetNamespace(mcpServer.Namespace) |
| 133 | + |
| 134 | + // Build the service URL for the ToolHive MCP server |
| 135 | + serviceName := createServiceName(mcpServer.Name) |
| 136 | + serviceURL := fmt.Sprintf("http://%s.%s.svc.cluster.local:%d", |
| 137 | + serviceName, mcpServer.Namespace, mcpServer.Spec.Port) |
| 138 | + |
| 139 | + // Determine the config type based on ToolHive transport |
| 140 | + var configType string |
| 141 | + var config map[string]interface{} |
| 142 | + |
| 143 | + switch mcpServer.Spec.Transport { |
| 144 | + case "sse": |
| 145 | + configType = kagentConfigTypeSSE |
| 146 | + config = map[string]interface{}{ |
| 147 | + kagentConfigTypeSSE: map[string]interface{}{ |
| 148 | + "url": serviceURL, |
| 149 | + }, |
| 150 | + } |
| 151 | + case "streamable-http": |
| 152 | + configType = kagentConfigTypeStreamableHTTP |
| 153 | + config = map[string]interface{}{ |
| 154 | + kagentConfigTypeStreamableHTTP: map[string]interface{}{ |
| 155 | + "url": serviceURL, |
| 156 | + }, |
| 157 | + } |
| 158 | + default: |
| 159 | + // For stdio or any other transport, default to SSE |
| 160 | + // since ToolHive exposes everything via HTTP |
| 161 | + configType = kagentConfigTypeSSE |
| 162 | + config = map[string]interface{}{ |
| 163 | + kagentConfigTypeSSE: map[string]interface{}{ |
| 164 | + "url": serviceURL, |
| 165 | + }, |
| 166 | + } |
| 167 | + } |
| 168 | + |
| 169 | + config["type"] = configType |
| 170 | + |
| 171 | + // Build the spec |
| 172 | + spec := map[string]interface{}{ |
| 173 | + "description": fmt.Sprintf("ToolHive MCP Server: %s", mcpServer.Name), |
| 174 | + "config": config, |
| 175 | + } |
| 176 | + |
| 177 | + kagentToolServer.Object = map[string]interface{}{ |
| 178 | + "apiVersion": "kagent.dev/v1alpha1", |
| 179 | + "kind": "ToolServer", |
| 180 | + "metadata": map[string]interface{}{ |
| 181 | + "name": kagentToolServer.GetName(), |
| 182 | + "namespace": kagentToolServer.GetNamespace(), |
| 183 | + "labels": map[string]interface{}{ |
| 184 | + "toolhive.stacklok.dev/managed-by": "toolhive-operator", |
| 185 | + "toolhive.stacklok.dev/mcpserver": mcpServer.Name, |
| 186 | + }, |
| 187 | + "ownerReferences": []interface{}{ |
| 188 | + map[string]interface{}{ |
| 189 | + "apiVersion": "toolhive.stacklok.dev/v1alpha1", |
| 190 | + "kind": "MCPServer", |
| 191 | + "name": mcpServer.Name, |
| 192 | + "uid": string(mcpServer.UID), |
| 193 | + "controller": true, |
| 194 | + "blockOwnerDeletion": true, |
| 195 | + }, |
| 196 | + }, |
| 197 | + }, |
| 198 | + "spec": spec, |
| 199 | + } |
| 200 | + |
| 201 | + return kagentToolServer |
| 202 | +} |
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