The controller.py file in this repository takes the file named chapter2.txt and emulates a simple horizontally sharded database, allowing easy understanding of how data is distributed across nodes. This particular handler is unfinished; it can initialize nodes and add nodes to an initialized list, but it cannot remove nodes or handle replication. That is an exercise for the reader.
Content in chapter2.txt retrieved from https://www.bookbrowse.com/excerpts/index.cfm/book_number/452/page_number/1/harry-potter-and-the-sorcerers-stone#excerpt.