feat: define BodyBasedRoutingConfig API types for BBR pluggability

Author: gyliu513

apix/config/v1alpha1/bodybasedroutingconfig_types.go

@@ -0,0 +1,89 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+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 v1alpha1
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +kubebuilder:object:root=true
+
+// BodyBasedRoutingConfig is the Schema for the bodybasedroutingconfigs API.
+// It defines the plugins and request/response pipelines for the BBR component.
+type BodyBasedRoutingConfig struct {
+	metav1.TypeMeta `json:",inline"`
+
+	// +required
+	// +kubebuilder:validation:Required
+	// Plugins is the list of plugins that will be instantiated.
+	Plugins []PluginSpec `json:"plugins"`
+
+	// +optional
+	// Request is the ordered list of plugins to execute on the request path.
+	// Plugins are executed in the order they appear in this list.
+	// Each referenced plugin must implement the RequestProcessor interface.
+	Request []BBRPluginRef `json:"request,omitempty"`
+
+	// +optional
+	// Response is the ordered list of plugins to execute on the response path.
+	// Plugins are executed in the order they appear in this list.
+	// Each referenced plugin must implement the ResponseProcessor interface.
+	Response []BBRPluginRef `json:"response,omitempty"`
+}
+
+func (cfg BodyBasedRoutingConfig) String() string {
+	var parts []string
+	if len(cfg.Plugins) > 0 {
+		parts = append(parts, fmt.Sprintf("Plugins: %v", cfg.Plugins))
+	}
+	if len(cfg.Request) > 0 {
+		parts = append(parts, fmt.Sprintf("Request: %v", cfg.Request))
+	}
+	if len(cfg.Response) > 0 {
+		parts = append(parts, fmt.Sprintf("Response: %v", cfg.Response))
+	}
+	return "{" + strings.Join(parts, ", ") + "}"
+}
+
+// BBRPluginRef references a plugin defined in the Plugins section
+// for use in request or response pipelines.
+type BBRPluginRef struct {
+	// +required
+	// +kubebuilder:validation:Required
+	// PluginRef specifies a particular Plugin instance to be used in this
+	// pipeline step. The reference is to the name of an entry of the Plugins
+	// defined in the configuration's Plugins section.
+	PluginRef string `json:"pluginRef"`
+
+	// +optional
+	// Parameters are optional runtime parameters for this pipeline step.
+	// The plugin is responsible for parsing these parameters.
+	Parameters json.RawMessage `json:"parameters,omitempty"`
+}
+
+func (ref BBRPluginRef) String() string {
+	var parts []string
+	parts = append(parts, "PluginRef: "+ref.PluginRef)
+	if len(ref.Parameters) > 0 {
+		parts = append(parts, "Parameters: "+string(ref.Parameters))
+	}
+	return "{" + strings.Join(parts, ", ") + "}"
+}