Support update call

fhirbuffer.pb.ex

@@ -12,6 +12,18 @@ defmodule Fhirbuffer.Search do
   field :type, 2, type: :string
 end
 
+defmodule Fhirbuffer.Change do
+  @moduledoc false
+  use Protobuf, syntax: :proto3
+
+  @type t :: %__MODULE__{
+          resource: String.t()
+        }
+  defstruct [:resource]
+
+  field :resource, 1, type: :bytes
+end
+
 defmodule Fhirbuffer.Record do
   @moduledoc false
   use Protobuf, syntax: :proto3
@@ -29,6 +41,7 @@ defmodule Fhirbuffer.Fhirbuffer.Service do
   use GRPC.Service, name: "fhirbuffer.Fhirbuffer"
 
   rpc :Read, Fhirbuffer.Search, Fhirbuffer.Record
+  rpc :Update, Fhirbuffer.Change, Fhirbuffer.Record
 end
 
 defmodule Fhirbuffer.Fhirbuffer.Stub do

fhirbuffer.proto

@@ -10,6 +10,9 @@ service Fhirbuffer {
  // Obtains the healthcare resource that matches the search criteria.
  rpc Read(Search) returns (Record) {}
 
+ // Modifies the healthcare resource 
+ rpc Update(Change) returns (Record) {}
+
 }
 
 // A search criteria to request the healthcare resource.
@@ -21,11 +24,12 @@ message Search {
  string type = 2;
 }
 
+// A modification to change the healthcare resource.
+message Change {
+ bytes resource = 1;
+}
+
 // A healthcare resource returned from the data store.
 message Record {
-//// string id = 1;
-//// string resource_type = 2;
-//// string status = 3;
-
  bytes resource = 1;
 }