Creating and using a REST service

The NoteStore class is used to persist and retrieve notes. Because other applications may require this functionality, too, you want to provide it as a service. Starting with the implementation based on Redis from Chapter 5, Accessing a Database, you can extract the following interface and save it is as notestore.d:

module notestore;

struct Note
{
  long id;
  string topic;
  string content;
}

interface NoteStore
{
  Note[] getNotes(string name);
  long addNote(string name, Note note);
}

The only change here is that addNote() cannot have a ref Note parameter. The reason is that the caller of the method lives in a different process that is possible on a different computer. Therefore, the Note struct of the caller cannot be changed.

The server and client both require this interface. You use a separate module for it.

Providing a service

Let's create the server side. The main difference from the previous implementations is that the implementation of the NoteStore...