ConnectToTiller.java

import java.util.List;

import hapi.release.ReleaseOuterClass.Release;

import hapi.services.tiller.ReleaseServiceGrpc;
import hapi.services.tiller.ReleaseServiceGrpc.ReleaseServiceBlockingStub;
import hapi.services.tiller.Tiller.GetHistoryRequest;
import hapi.services.tiller.Tiller.GetHistoryResponse;

import io.fabric8.kubernetes.client.DefaultKubernetesClient;

import org.microbean.helm.Tiller;

// Use a DefaultKubernetesClient to set up a port forwarding situation
// with a Tiller pod running in your cluster, and make sure both are
// in a try-with-resources block so they're closed properly:
try (final DefaultKubernetesClient client = new DefaultKubernetesClient();
     final Tiller tiller = new Tiller(client)) {

  // Let's do the equivalent of helm history someRelease.
  final GetHistoryRequest.Builder builder = GetHistoryRequest.newBuilder();
  assertNotNull(builder);
  builder.setMax(1);
  builder.setName(releaseName);
  final GetHistoryRequest request = builder.build();

  final ReleaseServiceBlockingStub stub = tiller.getReleaseServiceBlockingStub();
  
  final GetHistoryResponse response = stub.getHistory(request);
  final List<? extends Release> releasesList = response.getReleasesList();
  final Release release = releasesList.get(0);
}