fix-multiple-scheduling-profiles (kubernetes-sigs#1698)

Author: learner0810

pkg/epp/config/loader/configloader.go

@@ -31,6 +31,7 @@ import (
 	"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/plugins"
 	"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/scheduling"
 	"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/scheduling/framework"
+	"sigs.k8s.io/gateway-api-inference-extension/pkg/epp/scheduling/framework/plugins/profile"
 )
 
 var scheme = runtime.NewScheme()
@@ -113,6 +114,10 @@ func loadSchedulerConfig(configProfiles []configapi.SchedulingProfile, handle pl
 		return nil, errors.New("no profile handler was specified")
 	}
 
+	if profileHandler.TypedName().Type == profile.SingleProfileHandlerType && len(profiles) > 1 {
+		return nil, errors.New("single profile handler is intended to be used with a single profile, but multiple profiles were specified")
+	}
+
 	return scheduling.NewSchedulerConfig(profileHandler, profiles), nil
 }
 

pkg/epp/config/loader/configloader_test.go

@@ -420,6 +420,11 @@ func TestLoadConfig(t *testing.T) {
 			configText: errorNoProfileHandlersText,
 			wantErr:    true,
 		},
+		{
+			name:       "errorMultiProfilesUseSingleProfileHandler",
+			configText: errorMultiProfilesUseSingleProfileHandlerText,
+			wantErr:    true,
+		},
 	}
 
 	registerNeededPlgugins()
@@ -895,3 +900,23 @@ schedulingProfiles:
   plugins:
   - pluginRef: maxScore
 `
+
+// multiple profiles using SingleProfileHandler
+//
+//nolint:dupword
+const errorMultiProfilesUseSingleProfileHandlerText = `
+apiVersion: inference.networking.x-k8s.io/v1alpha1
+kind: EndpointPickerConfig
+plugins:
+- name: profileHandler
+  type: single-profile-handler
+- name: maxScore
+  type: max-score-picker
+schedulingProfiles:
+- name: default
+  plugins:
+  - pluginRef: maxScore
+- name: prof2
+  plugins:
+  - pluginRef: maxScore
+`