How can I interact with containerd gRPC API using grpcurl? - grpc

Question

Introduction
There is a CLI tool to interact with containerd called ctr. However I would like to achieve the same results without it using curl, after searching on google it can't be done with curl but grpcurl instead.
How can I do basic gRPC calls to containerd?
What I have tried
First I downloaded both grpcurl and api.proto.
Then I listed available services:
vagrant#ubuntu-focal:~/containerd/api/grpc/types$ grpcurl -import-path . -proto api.proto list
types.API
vagrant#ubuntu-focal:~/containerd/api/grpc/types$ grpcurl -import-path . -proto api.proto list types.API
types.API.AddProcess
types.API.CreateCheckpoint
types.API.CreateContainer
types.API.DeleteCheckpoint
types.API.Events
types.API.GetServerVersion
types.API.ListCheckpoint
types.API.Signal
types.API.State
types.API.Stats
types.API.UpdateContainer
types.API.UpdateProcess
Used protoc to create a compiled version instead but didnt seem to change anything.
Finally tried making a request to the method Stats (including containerd's UNIX socket path and -plaintext). However it seems I am messing something up, here is the error (both using --proto and --protoset:
sudo grpcurl -plaintext -protoset myservice.protoset -unix /run/containerd/containerd.sock types.API/Stats
ERROR:
Code: Unimplemented
Message: unknown service types.API
sudo grpcurl -plaintext -proto api.proto -unix /run/containerd/containerd.sock types.API.Stats
ERROR:
Code: Unimplemented
Message: unknown service types.API
Also tried with:
API/Stats
API.Stats
types.API.Stats

Answer 1

I cloned the wrong repo instead of containerd.
To check it working use the following request:
vagrant#ubuntu-focal:~/containerd/api/services/version/v1$ sudo grpcurl -plaintext -proto version.proto -unix /run/containerd/containerd.sock containerd.services.version.v1.Version/Version
{
"version": "1.5.5-0ubuntu3~20.04.2"
}