实时协作IDE后端Nodemon服务器频繁崩溃问题求助

你的服务器持续崩溃是由两处明显的代码错误导致的，以下是具体问题和修复方案：

1. 函数参数拼写错误 #

在getAllConnectedClients函数中，你将参数roomId误写为rommId，这会导致无法正确获取指定房间的Socket连接列表，调用该函数时直接抛出错误。

修复后的函数：

const getAllConnectedClients = (roomId) => {
    return Array.from(io.sockets.adapter.rooms.get(roomId) || []).map(
        (socketId) => {
            return {
                socketId,
                username: userSocketMap[socketId],
            };
        }
    );
};

2. 环境变量读取错误 #

代码中process.nextTick.PORT是完全错误的写法，nextTick是Node.js的异步执行方法，并非存储环境变量的对象。正确读取端口环境变量的方式是process.env.PORT，错误写法会导致端口读取异常，进而引发服务器运行错误。

修复后的端口定义：

const PORT = process.env.PORT || 5000;

完整修复后的代码 #

const express = require("express");
const app = express();
const http = require('http');
const {Server} = require('socket.io');

const server = http.createServer(app);
const io = new Server(server);

const userSocketMap = {};

const getAllConnectedClients = (roomId) => {
    return Array.from(io.sockets.adapter.rooms.get(roomId) || []).map(
        (socketId) => {
            return {
                socketId,
                username: userSocketMap[socketId],
            };
        }
    );
};

io.on("connection", (socket) => {
    socket.on("join", ({ roomId, username }) => {
        userSocketMap[socket.id] = username;
        socket.join(roomId);
        const clients = getAllConnectedClients(roomId);
        console.log(clients);
    });
});

const PORT = process.env.PORT || 5000;
server.listen(PORT, () => console.log('server is running on port', PORT));

内容的提问来源于stack exchange，提问作者Divyansh Pathak