Add chunk number to Response::Transfer.

src/common/requests/transfer.cr

@@ -56,7 +56,8 @@ end
 class FileStorage::Response
 	JSONIPC.request Transfer, 40 do
 		property mid : String
-		def initialize(@mid)
+		property n : Int32    # chunk number
+		def initialize(@mid, @n)
 		end
 	end
 end

src/server/storage.cr

@@ -82,7 +82,7 @@ class FileStorage::Storage
 
 		# TODO: verify the digest, if no more chunks.
 
-		FileStorage::Response::Transfer.new mid
+		FileStorage::Response::Transfer.new mid, chunk_number
 	rescue e
 		puts "Error handling transfer: #{e.message}"
 		FileStorage::Response::Error.new mid.not_nil!, "Unexpected error: #{e.message}"