如何使用 Nexmo 建立多个 websocket 连接

Question

我在我的服务器中实现了 nexmo 提供的示例代码（如下）。但是，我遇到了一个问题，如果 2 个调用者 ping 我的服务器，第二个调用者的二进制数据也会流入同一个 websocket 端点；从而导致两个二进制流进入同一个 websocket 端点。我怎样才能实现nexmo，以便每个调用者都有自己的websocket来连接到代理？我相信 socket.io 是解决方案，但是我不熟悉它。

const express = require('express')
const app = express()
var bodyParser = require('body-parser');
app.use(bodyParser.json());
var expressWs = require('express-ws')(app);
var isBuffer = require('is-buffer')
var header = require("waveheader");
var fs = require('fs');
var file;



//Serve a Main Page
app.get('/', function(req, res) {
    res.send("Node Websocket");
});


//Serve the NCCO on the /ncco answer URL
app.get('/ncco', function(req, res) {

    var ncco = require('./ncco.json');
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify(ncco), 'utf-8');
});


//Log the Events
app.post('/event', function(req, res) {
    console.log(req.body);
    res.send("ok");
});

// Handle the Websocket
app.ws('/socket', function(ws, req) {
    var rawarray = []; 
    console.log("Websocket Connected")
    ws.on('message', function(msg) {
     if (isBuffer(msg)) {
             rawarray.push(msg);
     }
     else {
         console.log(msg); 
     }
    });
    ws.on('close', function(){
      console.log("Websocket Closed")
      file = fs.createWriteStream('./output.wav');
      file.write(header(16000 * rawarray.length/50 * 2,{
                        sampleRate: 16000,
                        channels: 1,
                        bitDepth: 16}));
      rawarray.forEach(function(data){
          file.write(data);
      });
  })
});

app.listen(8000, () => console.log('App listening on port 8000!'))

Answer 1

它应该适用于您当前的实现，您需要进行一些更改。因此，不是每个 WebSocket 都进入同一个端点并写入同一个输出文件，而是需要在单独的路由上流式传输每个 WebSocket，并将每个输出保存到不同的文件中。将您的套接字路由更改为如下所示：

app.ws('/socket/:identifier', function(ws, req) {
    var rawarray = []; 
    console.log("Websocket Connected")
    ws.on('message', function(msg) {
     if (isBuffer(msg)) {
             rawarray.push(msg);
     }
     else {
         console.log(msg); 
     }
    });
    ws.on('close', function(){
      console.log("Websocket Closed")
      file = fs.createWriteStream('./' + req.params.identifier + '.wav');
      file.write(header(16000 * rawarray.length/50 * 2,{
                        sampleRate: 16000,
                        channels: 1,
                        bitDepth: 16}));
      rawarray.forEach(function(data){
          file.write(data);
      });
  })
});

要完成这项工作，您还需要更改 NCCO，而不是从磁盘读取静态文件，而是在路由中生成它。我不知道你在文件中到底有什么，但你可以按原样使用它并将套接字连接位更改为：

app.get('/ncco', function(req, res) {

  var ncco = [
    {
      "action": "talk",
      "text": "Please wait while we connect you"
    },
    {
      "action": "connect",
      "eventUrl": [
        "https://yourserver.com/event"
      ],
      "from": "YOUR_NEXMO_NUMBER",
      "endpoint": [
        {
          "type": "websocket",
          "uri": "ws://yourserver.com/socket/" + req.query.from,
          "content-type": "audio/l16;rate=16000"
        }
      ]
    }
  ]
  res.writeHead(200, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify(ncco), 'utf-8');
});