新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch21/docker-images/todo-api/handler.js

@@ -0,0 +1,24 @@
+const NATS = require('nats')
+const nc = NATS.connect({url: 'nats://message-queue:4222', json: true})
+const { v4: uuidv4 } = require('uuid');
+
+function post(req, res, next) {
+  console.log('** todo-api handler called');
+
+  var newItemEvent = {
+    Subject: "events.todo.newitem",
+    Item: {
+      Item: Object.keys(req.body)[0],
+      DateAdded: new Date().toISOString()
+    },
+    CorrelationId: uuidv4()
+  }
+
+  nc.publish('events.todo.newitem', newItemEvent)
+  console.log(`** New item published, event ID: ${newItemEvent.CorrelationId}`);
+
+  res.send(201);
+  next();
+}
+
+module.exports = { post }