Typeorm + Express on Cloud Function for Firebase

Question

我搜索了很多，但没有关于如何使用 Typeorm 和 express 设置 firebase 云功能。

我正在尝试使用 Express + Apollo 服务器 + TypeORM 构建一个 api 服务器，但是要使用 TypeORM 连接到数据库，我需要执行类似的操作

createConnection().then(async connection => {
  // init server here
  app = express()
  ...
})

但要部署到 Firebase，我必须这样做

export const server = functions.https.onRequest(app)

我该如何组合这些？

也许我能做到

export const server = functions.https.onRequest(async (req, res) => {
  createConnection().then(async connection => {
    // init server here
    app = express()
    ...
  })
})

但是由于是Cloud Function，所以每次请求来，都会创建一个新的实例，也就是创建一个新的连接。这个可以吗？不会有速度问题吗？

---

更新

import { connect } from './config';

const app = express()
export const server = functions.https.onRequest(async (req, res) => {
  const connection = await connect();
  return app(req, res)
})

Answer 1

假设您有一个./config 文件，您可以在其中建立数据库连接。然后，您可以将其导入您的index.ts 并按如下方式使用：

import * as functions from 'firebase-functions';
import { connect } from './config';

export const server = functions.https.onRequest(async (request, response) => {
     
    // Establish connection to DB
    const connection = await connect();

    const usersRepository = connection.getRepository(Users);

    // Count the users
    const count = await usersRepository.count();

    // Get all the users 
    const allUsers = await usersRepository.find();

    // SQL Query to fetch the users who are older than 21
    const query = await usersRepository.query('SELECT name FROM users WHERE AGE > 21');    

    response.send(allUsers);

});

如果您对如何配置配置文件仍有疑问，我相信将sample code 与typeORM configuration files 一起使用可能会有所帮助。

我还建议您查看Firebase documentation，了解有关在 Cloud Functions for Firebase 中使用 Express.js 的示例。

---

更新：要将 Express + TypeORM 添加到 Cloud Function for Firebase，您可以执行以下操作：

import * as functions from 'firebase-functions';
import {Request, Response} from "express";
import { connect } from './config';
import * as express from 'express';

// Initializing Express server and defined PORT
const PORT = 3000;
const app = express();

// Register '/' endpoint 
app.get('/', (request, response, next) => {
  response.send('Hello World from Cloud Firestore for Firebase');
});

// Register 'users' endpoint
app.get('/users', async function(request: Request, response: Response) {

  // Establish connection to DB
  const connection = await connect();

  const usersRepository = connection.getRepository(Users);

  // Get all the users 
  const allUsers = await usersRepository.find();

  response.json(allUsers);

});

app.listen(PORT, () => {
  console.log('Server is running on PORT', PORT);
});

// Exports the Express app as a single HTTP function
exports.app = functions.https.onRequest(app); 

请查看Firebase documentation 和adding Express to the application 的TypeORM 存储库。