Add domain code example

Author: tshemsedinov

examples/domain.js

@@ -0,0 +1,33 @@
+'use strict';
+
+// Domain logic: message
+
+let storage = null;
+
+const init = (storageProvider) => {
+  storage = storageProvider;
+};
+
+const create = async ({ author, title, content, feed }) => {
+  const authorExists = await storage.has(author);
+  if (!authorExists) throw new Error('Author not found');
+
+  const feedExists = await storage.has(feed);
+  if (!feedExists) throw new Error('Feed not found');
+
+  const created = new Date().getTime();
+  const status = 'draft';
+  const post = { title, content, author, created, status };
+  const postId = await storage.insert(post);
+
+  return { postId };
+};
+
+const publish = async ({ postId }) => {
+  const postRecord = await storage.get(postId);
+  if (!postRecord) throw new Error('Post not found');
+  postRecord.status = 'published';
+  await postRecord.save();
+};
+
+module.exports = { init, create, publish };

examples/main.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const globalStorage = require('../gs.js');
+const domain = require('./domain.js');
+
+const main = async () => {
+  // App start and init
+  const storage = await globalStorage.open();
+  domain.init(storage);
+
+  // Create post
+  const title = 'Example';
+  const content = 'Text';
+  const post = { author: '123', title, content, feed: '123' };
+  const postId = await domain.create(post);
+  console.log('Post created:', postId);
+
+  // Publish post
+  await domain.publish({ postId });
+  console.log('Post published');
+};
+
+main();