Implement RegistrationServer — kubelet plugin registration gRPC service #6
Description
Equivalent to Go's registrationserver.go. Implements the two RPCs that kubelet calls when
it discovers a new plugin socket: GetInfo returns the driver name, DRA endpoint path, and
supported API versions; NotifyRegistrationStatus stores the registration outcome and returns
an error if registration failed. For testability, both handlers should support runtime error
injection via atomic pointers, matching Go's setGetInfoError and setNotifyRegistrationStatusError.
References
- Go
registrationserver.go: https://github.com/kubernetes/dynamic-resource-allocation/blob/main/kubeletplugin/registrationserver.go - Plugin registration proto: https://github.com/kubernetes/kubelet/blob/v0.34.4/pkg/apis/pluginregistration/v1/api.proto
- Kubernetes plugin watcher: https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#plugin-registration