Add files via upload

Dockerfile

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+FROM node:12
+
+WORKDIR /usr/src/app
+COPY package*.json ./
+RUN npm i
+COPY . .
+
+EXPOSE 80
+CMD ["node", "server.js"]

package.json

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+{
+    "name": "my-backend-api",
+    "version": "1.0.0",
+    "description": "",
+    "main": "server.js",
+    "scripts": {
+      "test": "echo \"Error: no test specified\" && exit 1",
+      "start": "node server.js"
+    },
+    "author": "",
+    "license": "ISC",
+    "dependencies": {
+      "@google-cloud/pubsub": "^3.3.0",
+      "express": "^4.18.2"
+    }
+  }

server.js

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+// server.js
+const express = require("express");
+const app = express();
+/**
+ * TODO(developer): Uncomment these variables before running the sample.
+ */
+// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
+const data = JSON.stringify({foo: 'bar'});
+
+// Imports the Google Cloud client library
+const {PubSub} = require('@google-cloud/pubsub');
+
+// Creates a client; cache this for further use
+const pubSubClient = new PubSub();
+
+async function publishMessage() {
+  // Publishes the message as a string, e.g. "Hello, world!" or JSON.stringify(someObject)
+  const dataBuffer = Buffer.from(data);
+
+  try {
+    const messageId = await pubSubClient
+      .topic(test-topic)
+      .publishMessage({data: dataBuffer});
+    console.log(`Message ${messageId} published.`);
+  } catch (error) {
+    console.error(`Received error while publishing: ${error.message}`);
+    process.exitCode = 1;
+  }
+}
+
+app.get("/user/:id", (req, res) => {
+  const id = req.params.id;
+  res.json({
+    id,
+    name: `John Doe #${id}`
+  });
+
+publishMessage();
+});
+
+app.listen(8080, () => {
+  console.log("Server running on port 8080");
+});