go/runtime/registry/host: Always send node in RPC call response

go/runtime/host/protocol/types.go

@@ -480,7 +480,7 @@ type HostRPCCallRequest struct {
 
 	// Nodes are optional node identities in case the request should be forwarded to specific
 	// node instances and not to randomly chosen ones as selected by the host.
-	Nodes []signature.PublicKey `json:"nodes,omitempty"`
+	Nodes []signature.PublicKey `json:"nodes"`
 	// PeerFeedback contains optional peer feedback for the last RPC call under the given endpoint.
 	//
 	// This enables the runtime to notify the node whether the given peer should continue to be used
@@ -495,7 +495,7 @@ type HostRPCCallResponse struct {
 	// Response is a response to a HostRPCCallRequest.
 	Response []byte `json:"response"`
 	// Node is the identifier of the node that handled the request.
-	Node *signature.PublicKey `json:"node,omitempty"`
+	Node signature.PublicKey `json:"node"`
 }
 
 // HostStorageEndpoint is the host storage endpoint.

go/runtime/registry/host.go

@@ -250,15 +250,9 @@ func (h *runtimeHostHandler) handleHostRPCCall(
 		if err != nil {
 			return nil, err
 		}
-		// Don't send node identity if the runtime doesn't support explicit key manager RPC calls.
-		if rq.Nodes == nil {
-			return &protocol.HostRPCCallResponse{
-				Response: res,
-			}, nil
-		}
 		return &protocol.HostRPCCallResponse{
 			Response: res,
-			Node:     &node,
+			Node:     node,
 		}, nil
 	default:
 		return nil, fmt.Errorf("endpoint not supported")