Node.js 如何使用nodejs/mongodb/socketio将mongodb数据实时流式传输到前端？

我试图构建一个实时仪表板，将数据从mongodb capped集合流式传输到登录用户的前端。后端将是python或类似的，并将不断用新数据更新用户集合。我使用passportjs进行身份验证，passport socketio redis集成socketio

我认为第一个目标是将用户名作为值添加到socketio客户机列表中

示例：已连接一个客户端，客户端列表为：['wukBbRD3vcXCuqylAAAA']

添加用户值，现在客户端列表看起来像：[{'wukBbRD3vcXCuqylAAAA'：username}]

在此之后，我会定期（每隔1秒左右）循环浏览客户机列表，并为每个客户机启动一个mongodb流。然后，我将使用其套接字ID将结果数据流传输到该客户机（我假设在断开连接后，客户机key:val对将被删除，可能需要添加额外的代码来终止mongodb流）

我已经想出了下面的代码，但它无法正确执行上述操作，因为我目前一直在试图找出如何将用户名与socketio客户端id配对。

这是构建实时仪表板的好方法吗？我越深入这一点，它就越不可信/可扩展。谢谢大家的帮助

/bin/www

var app = require('../app');
var debug = require('debug')('project:server');
var http = require('http');

//misc server initialization stuff left out to save space. this file calls in sockets.js below

var io = require('socket.io').listen(server);
require('../sockets')(io);

sockets.js

var passport = require('passport');
var cookieParser = require('cookie-parser');
var redis = require('redis').createClient();
var session = require('express-session');
var RedisStore = require('connect-redis')(session);
var socketioRedis = require("passport-socketio-redis");
var History = require('./models/history');

var clientinfo;
var user_name;

module.exports = function (io) { 

  io.use(socketioRedis.authorize({
  passport:passport,
  cookieParser: cookieParser,
  key:         'express.sid',       
  secret:      'keyboard cat',    
  store:       new RedisStore({ host: 'localhost', port: 6379, client: redis }),
  success:     authorizeSuccess,  //callback on success
  fail:        authorizeFail     //callback on fail/error 
  }));

function authorizeSuccess(data, accept){
    //get the username
    user_name = data.user.id;
    accept();
}

function authorizeFail(data, message, error, accept)
{
    if(error)
        accept(new Error(message));
}

io.on('connection', function(socket){
  //get list of clients - I believe I need to somehow add the username to the client list here.
  clientinfo = Object.keys(io.engine.clients)
});


setInterval(function(){
  for (key in clientdict) {
    //start new stream for each client (not 100% sure multiple streams can exist)
    streamData (key, clientdict[key])
  }
}
},1000);

//create mongodb stream and emit to client
function streamData (u_id, sockvar) {
    var stream = History.find({ user_id: u_id}, {'_id':0, 'test':1}).tailable(true).stream();
      stream.on('data', function (doc) {
        io.to(sockvar).emit('dash_data', { dash_data: doc });
    });
    }
}

---

可能已经解决了这个问题-应该更好地阅读文档。原来passport socketio redis允许您访问“socket.request.user”，它返回有关用户的信息。有关在新连接/断开连接时创建和删除键：值对的信息，请参见下面的代码

io.on('connection', function(socket){
  clientdict[socket.request.user.id] = socket.id;
  //console.log(socket.request.user)
  //all clients console.log(Object.keys(io.engine.clients))
  console.log(clientdict)
  socket.on('disconnect', function(){
    delete clientdict[socket.request.user.id]
    console.log('removed')
    console.log(socket.request.user.id)
  });
});

---

可能已经解决了这个问题-应该更好地阅读文档。原来passport socketio redis允许您访问“socket.request.user”，它返回有关用户的信息。有关在新连接/断开连接时创建和删除键：值对的信息，请参见下面的代码

io.on('connection', function(socket){
  clientdict[socket.request.user.id] = socket.id;
  //console.log(socket.request.user)
  //all clients console.log(Object.keys(io.engine.clients))
  console.log(clientdict)
  socket.on('disconnect', function(){
    delete clientdict[socket.request.user.id]
    console.log('removed')
    console.log(socket.request.user.id)
  });
});