如何在 socket.io 服務器中調用節點 api 響應

Question

場景：在 socket.io 節點服務器中創建一個節點 API (GET) 調用該 API 並在 ZD12DB8624A0FFC5B78 客戶端中調用此套接字服務器。

我做了什么：為獲取請求和發布創建了一個節點 API 並創建了一個套接字服務器，我嘗試使用該應用程序。

問題： 1. 我嘗試使用 API 但無法獲取套接字服務器中的數據 2. 如果它有效，我如何在 angular 應用程序中單擊按鈕時獲取套接字數據？

注意：我在 3000 服務器上運行節點 API 並在 3001 上運行套接字服務器。

下面是我的代碼

在 3000 端口上運行的節點 api 代碼：

const express = require('express')
const bodyParser = require('body-parser');
const cors = require('cors');

const app = express()
const port = 3000

let books = [{
    "isbn": "9781593275846",
    "title": "Eloquent JavaScript, Second Edition",
    "author": "Marijn Haverbeke",
    "publish_date": "2014-12-14",
    "publisher": "No Starch Press",
    "numOfPages": 472,
}];

app.use(cors());

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.post('/book', (req, res) => {
    const book = req.body;

    // output the book to the console for debugging
    console.log(book);
    books.push(book);

    res.send('Book is added to the database');
});

app.get('/book', (req, res) => {
    res.json(books);
});



app.listen(port, () => console.log(`Hello world app listening on port ${port}!`));

Socket.io 服務器運行在 3001

  var app = require('express')();
    var http = require('http').createServer(app);
    var io = require('socket.io')(http);
    
    const apiUrl="http://localhost:3000/book"
    
    
    io.on('connection', function (socket) {
        socket.on('getBanners', function(data){
          request.get(apiUrl,function (error, response, body){
              console.log(body)
            socket.emit('result', {res:JSON.parse(body)})
          })
        });
      });
    
    http.listen(3001, function(){
        console.log('listening on *:3001');
    });

注意：節點 API 服務器 --> socketio 服務器（不是客戶端）

Answer 1

我不建議您采用那種設計。

Unless there is a very specific/important reason to have the socket.io server on a different port than the HTTP server, I would recommend having your socket.io server upgraded from the HTTP server itself.

例如。

在bin/www ：

const { initSocketIOServer } = require('../socket-server');

const port = normalizePort(process.env.PORT || '3001');
app.set('port', port);

/**
 * Create HTTP server.
 */

const server = http.createServer(app);
initSocketIOServer(server);

在socket.server.js

module.exports.initSocketServer = (server) => {
  io = require('socket.io')(server);

  io.on('connection', (socket) => {
    console.log('client connected');

    socket.on('getBanners', (event) => {
      // handle getBanners event here
    });
  });
};

但是，以您的示例為例，如果您確實需要向 HTTP 服務器發出請求以獲取數據，則可能需要使用 HTTP 庫：

socket.on('getBanners', (event) => {
  http.get({
    hostname: 'localhost',
    port: 3000,
    path: '/book',
    agent: false  // Create a new agent just for this one request
  }, (res) => {
    // Do stuff with response, eg.
    const socketResponse = processBooks(book);
    socket.emit('result', socketResponse);
  });
});

Answer 2

您可以在此處使用任何節點 package 請求請求https://github.com/request/request