feat: Load the SchedulerConfig from a configuration file/text and make it easier to add plugins

PROJECT

@@ -24,4 +24,12 @@ resources:
   kind: InferenceModel
   path: sigs.k8s.io/gateway-api-inference-extension/api/v1alpha1
   version: v1alpha1
+- api:
+    crdVersion: v1
+    namespaced: true
+  domain: x-k8s.io
+  group: inference
+  kind: EndpointPickerConfig
+  path: sigs.k8s.io/gateway-api-inference-extension/api/config/v1alpha1
+  version: v1alpha1
 version: "3"

api/config/v1alpha1/defaults.go

@@ -0,0 +1,29 @@
+/*
+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
+
+// SetDefaults_EndpointPickerConfig sets default values in a
+// EndpointPickerConfig struct.
+//
+// This naming convension is required by the defalter-gen code.
+func SetDefaults_EndpointPickerConfig(cfg *EndpointPickerConfig) {
+	for idx, pluginConfig := range cfg.Plugins {
+		if pluginConfig.Name == "" {
+			cfg.Plugins[idx].Name = pluginConfig.PluginName
+		}
+	}
+}

api/config/v1alpha1/doc.go

@@ -0,0 +1,22 @@
+/*
+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 contains API Schema definitions for the
+// inference.networking.x-k8s.io API group.
+//
+// +kubebuilder:object:generate=true
+// +groupName=inference.networking.x-k8s.io
+package v1alpha1

api/config/v1alpha1/endpointpickerconfig_types.go

@@ -0,0 +1,92 @@
+/*
+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"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +k8s:defaulter-gen=true
+// +kubebuilder:object:root=true
+
+// EndpointPickerConfig is the Schema for the endpointpickerconfigs API
+type EndpointPickerConfig struct {
+	metav1.TypeMeta `json:",inline"`
+
+	// +required
+	// +kubebuilder:validation:Required
+	// Plugins is the list of plugins that will be instantiated.
+	Plugins []PluginSpec `json:"plugins"`
+
+	// +required
+	// +kubebuilder:validation:Required
+	// SchedulingProfiles is the list of named SchedulingProfiles
+	// that will be created.
+	SchedulingProfiles []SchedulingProfile `json:"schedulingProfiles"`
+}
+
+// PluginSpec contains the information that describes a plugin that
+// will be instantiated.
+type PluginSpec struct {
+	// +optional
+	// Name provides a name for plugin entries to reference. If
+	// omitted, the value of the PluginName field will be used.
+	Name string `json:"name"`
+
+	// +required
+	// +kubebuilder:validation:Required
+	// PluginName specifies the plugin to be instantiated.
+	PluginName string `json:"pluginName"`
+
+	// +optional
+	// Parameters are the set of parameters to be passed to the plugin's
+	// factory function. The factory function is responsible
+	// to parse the parameters.
+	Parameters json.RawMessage `json:"parameters"`
+}
+
+// SchedulingProfile contains the information to create a SchedulingProfile
+// entry to be used by the scheduler.
+type SchedulingProfile struct {
+	// +kubebuilder:validation:Required
+	// Name specifies the name of this SchedulingProfile
+	Name string `json:"name"`
+
+	// +required
+	// +kubebuilder:validation:Required
+	// Plugins is the list of plugins for this SchedulingProfile. They are assigned
+	// to the appropriate "slots" based on their type.
+	Plugins []SchedulingPlugin `json:"plugins"`
+}
+
+// SchedulingPlugin describes a plugin that will be associated with a
+// SchedulingProfile entry.
+type SchedulingPlugin struct {
+	// +required
+	// +kubebuilder:validation:Required
+	// PluginRef specifies a partiular Plugin instance to be associated with
+	// this SchedulingProfile. The reference is to the name of an
+	// entry of the Plugins defined in the configuration's Plugins
+	// section
+	PluginRef string `json:"pluginRef"`
+
+	// +optional
+	// Weight is the weight fo be used if this plugin is a Scorer.
+	Weight *int `json:"weight"`
+}