custom-kube-scheduler/kubernetes-v1.15.4/pkg/kubelet/apis/pluginregistration/v1/api.proto

// To regenerate api.pb.go run hack/update-generated-kubelet-plugin-registration.sh
syntax = 'proto3';

package pluginregistration;

import "github.com/gogo/protobuf/gogoproto/gogo.proto";

option (gogoproto.goproto_stringer_all) = false;
option (gogoproto.stringer_all) =  true;
option (gogoproto.goproto_getters_all) = true;
option (gogoproto.marshaler_all) = true;
option (gogoproto.sizer_all) = true;
option (gogoproto.unmarshaler_all) = true;
option (gogoproto.goproto_unrecognized_all) = false;

// PluginInfo is the message sent from a plugin to the Kubelet pluginwatcher for plugin registration
message PluginInfo {
	// Type of the Plugin. CSIPlugin or DevicePlugin
	string type = 1;
	// Plugin name that uniquely identifies the plugin for the given plugin type.
	// For DevicePlugin, this is the resource name that the plugin manages and
	// should follow the extended resource name convention.
	// For CSI, this is the CSI driver registrar name.
	string name = 2;
	// Optional endpoint location. If found set by Kubelet component,
	// Kubelet component will use this endpoint for specific requests.
	// This allows the plugin to register using one endpoint and possibly use
	// a different socket for control operations. CSI uses this model to delegate
	// its registration external from the plugin.
	string endpoint = 3;
	// Plugin service API versions the plugin supports.
	// For DevicePlugin, this maps to the deviceplugin API versions the
	// plugin supports at the given socket.
	// The Kubelet component communicating with the plugin should be able
	// to choose any preferred version from this list, or returns an error
	// if none of the listed versions is supported.
	repeated string supported_versions = 4;
}

// RegistrationStatus is the message sent from Kubelet pluginwatcher to the plugin for notification on registration status
message RegistrationStatus {
	// True if plugin gets registered successfully at Kubelet
	bool plugin_registered  = 1;
	// Error message in case plugin fails to register, empty string otherwise
	string error  = 2;
}

// RegistrationStatusResponse is sent by plugin to kubelet in response to RegistrationStatus RPC
message RegistrationStatusResponse {
}

// InfoRequest is the empty request message from Kubelet
message InfoRequest {
}

// Registration is the service advertised by the Plugins.
service Registration {
	rpc GetInfo(InfoRequest) returns (PluginInfo) {}
	rpc NotifyRegistrationStatus(RegistrationStatus) returns (RegistrationStatusResponse) {}
}