javascript - 使用socket.io和node.js将消息发送到特定客户端(Send message to specific client with socket.io and node.js)

Question

I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a message from the server to an specific client, something like this:(我正在使用socket.io和node.js，直到现在看起来还不错，但我不知道如何从服务器向特定客户端发送消息，如下所示：)

client.send(message, receiverSessionId)

But neither the .send() nor the .broadcast() methods seem to supply my need.(但是.send()和.broadcast()方法似乎都不能满足我的需求。)

What I have found as a possible solution, is that the .broadcast() method accepts as a second parameter an array of SessionIds to which not send the message, so I could pass an array with all the SessionIds connected at that moment to the server, except the one I wish send the message, but I feel there must be a better solution.(我发现作为一种可能的解决方案，是.broadcast()方法接受一个不发送消息的SessionIds数组作为第二个参数，所以我可以传递一个数组，当时连接的所有SessionId都连接到服务器，除了我希望发送消息的那个，但我觉得必须有一个更好的解决方案。)

Any ideas?(有任何想法吗？)

  ask by Rodolfo Palma translate from so

Answer 1

Ivo Wetzel's answer doesn't seem to be valid in Socket.io 0.9 anymore.(Ivo Wetzel的答案似乎不再适用于Socket.io 0.9。)

In short you must now save the socket.id and use io.sockets.socket(savedSocketId).emit(...) to send messages to it.(简而言之，您现在必须保存socket.id并使用io.sockets.socket(savedSocketId).emit(...)向其发送消息。)

This is how I got this working in clustered Node.js server:(这就是我在集群Node.js服务器中使用它的方法：)

First you need to set Redis store as the store so that messages can go cross processes:(首先，您需要将Redis存储设置为存储，以便消息可以跨进程：)

var express = require("express");
var redis = require("redis");
var sio = require("socket.io");

var client = redis.createClient()
var app = express.createServer();
var io = sio.listen(app);

io.set("store", new sio.RedisStore);


// In this example we have one master client socket 
// that receives messages from others.

io.sockets.on('connection', function(socket) {

  // Promote this socket as master
  socket.on("I'm the master", function() {

    // Save the socket id to Redis so that all processes can access it.
    client.set("mastersocket", socket.id, function(err) {
      if (err) throw err;
      console.log("Master socket is now" + socket.id);
    });
  });

  socket.on("message to master", function(msg) {

    // Fetch the socket id from Redis
    client.get("mastersocket", function(err, socketId) {
      if (err) throw err;
      io.sockets.socket(socketId).emit(msg);
    });
  });

});

I omitted the clustering code here, because it makes this more cluttered, but it's trivial to add.(我在这里省略了聚类代码，因为它使它更加混乱，但添加起来很简单。)

Just add everything to the worker code.(只需将所有内容添加到工作人员代) More docs here http://nodejs.org/api/cluster.html(更多文档http://nodejs.org/api/cluster.html)