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/Dockerfile

@@ -0,0 +1,15 @@
+FROM node:12.17 AS builder
+
+WORKDIR /src
+COPY package.json .
+RUN npm install
+
+FROM node:12.17-alpine3.11
+
+CMD ["node", "/app/server.js"]
+ENV PORT=80
+EXPOSE 80
+
+WORKDIR /app
+COPY --from=builder /src/node_modules/ /app/node_modules/
+COPY *.js ./

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 }

learn/learn-kubernetes-master/kiamol/ch21/docker-images/todo-api/package.json

@@ -0,0 +1,12 @@
+{
+    "name": "todo-api",
+    "version": "0.1.0",
+    "main": "server.js",
+    "author": "kiamol",
+    "dependencies": {
+      "nats" : "1.4.9",
+      "restify" : "8.5.1",
+      "uuid" : "8.2.0"
+    }
+}
+  

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

@@ -0,0 +1,10 @@
+const restify = require("restify");
+const handler = require('./handler');
+
+var server = restify.createServer();
+server.use(restify.plugins.bodyParser());
+server.post("/todos", handler.post);
+
+server.listen(process.env.PORT, function() {
+  console.log(`${server.name} listening at ${server.url}`);
+});