MongoDB 連接：Pending Promise 超時錯誤

Question

問題總結

我正在嘗試運行nodemon server ，但出現超時錯誤， [nodemon] app crashed - waiting for file changes before starting...

問題詳情

我有 3 個文件，路徑如下： ./server.js 、 ./index.js和./api/restaurants.route.js 。

服務器.js

import express from "express";
import cors from "cors";
import restaurants from "./api/restaurants.route.js";

// Create a new express application instance 
const app = express();
// apply middleware
app.use(cors());
// parse request body as JSON. Our server can accept JSON data in the body of a request
app.use(express.json());

// specify some routes. This is the path that will be used to access the API 
app.use("/api/v1/restaurants", restaurants);
// If someone goes to a path that doesn't exist, return a 404 error
app.use("*", (req, res) => res.status(404).json({error : "Not found"}));

// export the application instance for use in the rest of the application
export default app

index.js

import app from "./server.js"
import mongodb from "mongodb";
import dotenv from "dotenv";

// Load environment variables from .env file, where API keys and passwords are configured
dotenv.config();
// Get access to the mongo client
const MongoClient = mongodb.MongoClient;

// set port
const port = process.env.PORT || 8000; 

// Connect to the database
MongoClient.connect(
    // The URL of the database to connect to
    process.env.RESTREVIEWS_DB_URI,
    {
        // The options to use when connecting to the database
        maxPoolSize: 50,
        wtimeoutMS: 2500,
        useNewUrlParser: true,
    }
    )
    // If the connection is not successful, throw an error
    .catch(err => {
        console.log(err.stack);
        process.exit(1);

    })
    // If the connection is successful, console log a message
    .then(async client => {
        app.listen(port, () => {
            console.log(`Server listening on port ${port}`);
        });
    });

餐廳.route.js

import express from "express";

// create router instance
const router = express.Router();

// respond to GET requests with hello
router.route("/").get((req, res) => {
    res.send("Hello from restaurants.route.js");
})

export default router;

輸出

當我在終端上運行nodemon server時，我在終端上獲得：

[nodemon] 2.0.16
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node server index.js`

然后幾秒鍾后

MongoServerSelectionError: connection <monitor> to [redacted] closed
    at Timeout._onTimeout ([redacted]/backend/node_modules/mongodb/lib/sdam/topology.js:306:38)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7)
[nodemon] app crashed - waiting for file changes before starting...

我嘗試了什么？

• 我嘗試將MongoClient.connect存儲為const a = MongoClient.connect(...並在控制台記錄它，以查看它輸出的內容。它輸出Promise { <pending> }
• 我嘗試注釋掉.then和.catch 。 這並沒有改變輸出
• 我嘗試從 10:00 到 23:00 遵循本教程。 這是我實際嘗試實現的代碼。 但是，代碼對我來說似乎相同，問題仍然存在

Answer 1

您應該嘗試在 mongodb 集群中將您的 IP 地址列入白名單。

1. 轉到您的 MongoDB Atlas 項目頁面
2. 點擊“網絡訪問”點擊
3. “添加當前 IP 地址”按鈕
4. 點擊“確認”