[英]Using Redis as PubSub over Socket.io
I am creating a chat application which enable users to do private and group chats. 我正在创建一个聊天应用程序,使用户可以进行私人聊天和群聊。 Planning to use following technologies for this app:-
计划为此应用程序使用以下技术: -
NodeJs + Socket.io + Redis + CouchDB(To store message history) + AngularJS NodeJs + Socket.io + Redis + CouchDB(存储消息历史记录)+ AngularJS
Per my initial research using Redis as a PubSub service is better approach over using Socket.io as pub-sub .Reason of this is if different users are connected to different server instances, then using socket in this scenario will create problem as message send by user 1 will not pass on to user 2(user 1 connected to server 1 and user 2 connected to server 2). 根据我最初的研究使用Redis作为PubSub服务是比使用Socket.io作为pub-sub的更好的方法。这是因为如果不同的用户连接到不同的服务器实例,那么在这种情况下使用套接字将产生问题,因为消息发送方式用户1不会传递给用户2(连接到服务器1的用户1和连接到服务器2的用户2)。
But if we use Redis, then per my understanding we have to create new channels to enable private chats. 但是如果我们使用Redis,那么根据我的理解,我们必须创建新的频道以启用私人聊天。 And their is a limit to 10k channels in Redis.
而且他们对Redis的10k频道有限制。
My Doubts are 我怀疑是
Regards, Vikram 此致,维克拉姆
After reading below articles/blog post, using Redis for pub/sub over socket.io pub/sub will help in scalability and better performance. 阅读下面的文章/博客文章后,使用Redis for pub / sub over socket.io pub / sub将有助于提高可伸缩性和性能。
https://github.com/sayar/RedisMVA/blob/master/module6_redis_pubsub/README.md https://github.com/sayar/RedisMVA/blob/master/module6_redis_pubsub/README.md
https://github.com/rajaraodv/redispubsub https://github.com/rajaraodv/redispubsub
Further I am able to create a quick POC on private chat using redis . 此外,我可以使用redis在私人聊天中创建快速POC。 Here is the code:-
这是代码: -
var app = require('http').createServer(handler);
app.listen(8088);
var io = require('socket.io').listen(app);
var redis = require('redis');
var redis2 = require('socket.io-redis');
io.adapter(redis2({ host: 'localhost', port: 6379 }));
var fs = require('fs');
function handler(req,res){
fs.readFile(__dirname + '/index.html', function(err,data){
if(err){
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
console.log("Listening on port 8088");
res.end(data);
});
}
var store = redis.createClient();
var pub = redis.createClient();
var sub = redis.createClient();
sub.on("message", function (channel, data) {
data = JSON.parse(data);
console.log("Inside Redis_Sub: data from channel " + channel + ": " + (data.sendType));
if (parseInt("sendToSelf".localeCompare(data.sendType)) === 0) {
io.emit(data.method, data.data);
}else if (parseInt("sendToAllConnectedClients".localeCompare(data.sendType)) === 0) {
io.sockets.emit(data.method, data.data);
}else if (parseInt("sendToAllClientsInRoom".localeCompare(data.sendType)) === 0) {
io.sockets.in(channel).emit(data.method, data.data);
}
});
io.sockets.on('connection', function (socket) {
sub.on("subscribe", function(channel, count) {
console.log("Subscribed to " + channel + ". Now subscribed to " + count + " channel(s).");
});
socket.on("setUsername", function (data) {
console.log("Got 'setUsername' from client, " + JSON.stringify(data));
var reply = JSON.stringify({
method: 'message',
sendType: 'sendToSelf',
data: "You are now online"
});
});
socket.on("createRoom", function (data) {
console.log("Got 'createRoom' from client , " + JSON.stringify(data));
sub.subscribe(data.room);
socket.join(data.room);
var reply = JSON.stringify({
method: 'message',
sendType: 'sendToSelf',
data: "Share this room name with others to Join:" + data.room
});
pub.publish(data.room,reply);
});
socket.on("joinRooom", function (data) {
console.log("Got 'joinRooom' from client , " + JSON.stringify(data));
sub.subscribe(data.room);
socket.join(data.room);
});
socket.on("sendMessage", function (data) {
console.log("Got 'sendMessage' from client , " + JSON.stringify(data));
var reply = JSON.stringify({
method: 'message',
sendType: 'sendToAllClientsInRoom',
data: data.user + ":" + data.msg
});
pub.publish(data.room,reply);
});
socket.on('disconnect', function () {
sub.quit();
pub.publish("chatting","User is disconnected :" + socket.id);
});
});
HTML Code HTML代码
<html>
<head>
<title>Socket and Redis in Node.js</title>
<script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
</head>
<body>
<div id="username">
<input type="text" name="usernameTxt" />
<input type="button" name="setUsername" value="Set Username" />
</div>
<div id="createroom" style="display:none;">>
<input type="text" name="roomNameTxt" />
<input type="button" name="setRooomName" value="Set Room Name" />
<input type="button" name="joinRooomName" value="Join" />
</div>
<div id="sendChat" style="display:none;">
<input type="text" name="chatTxt" />
<input type="button" name="sendBtn" value="Send" />
</div>
<br />
<div id="content"></div>
<script>
$(document).ready(function() {
var username = "anonymous";
var roomname = "anonymous";
$('input[name=setUsername]').click(function(){
if($('input[name=usernameTxt]').val() != ""){
username = $('input[name=usernameTxt]').val();
//var msg = {type:'setUsername',user:username};
socket.emit('setUsername',{user:username});
}
$('#username').slideUp("slow",function(){
$('#createroom').slideDown("slow");
});
});
$('input[name=setRooomName]').click(function(){
if($('input[name=roomNameTxt]').val() != ""){
roomname = $('input[name=roomNameTxt]').val();
socket.emit('createRoom',{user:username,room:roomname});
}
$('#createroom').slideUp("slow",function(){
$('#sendChat').slideDown("slow");
});
});
$('input[name=joinRooomName]').click(function(){
if($('input[name=roomNameTxt]').val() != ""){
roomname = $('input[name=roomNameTxt]').val();
socket.emit('joinRooom',{room:roomname});
}
$('#createroom').slideUp("slow",function(){
$('#sendChat').slideDown("slow");
});
});
var socket = new io.connect('http://localhost:8088');
var content = $('#content');
socket.on('connect', function() {
console.log("Connected");
});
socket.on('message', function(message){
//alert('received msg=' + message);
content.append(message + '<br />');
}) ;
socket.on('disconnect', function() {
console.log('disconnected');
content.html("<b>Disconnected!</b>");
});
$("input[name=sendBtn]").click(function(){
var msg = {user:username,room:roomname,msg:$("input[name=chatTxt]").val()}
socket.emit('sendMessage',msg);
$("input[name=chatTxt]").val("");
});
});
</script>
</body>
</html>
That's all code basic redis pub/sub. 这是所有代码基本redis pub / sub。
var redis = require("redis"); var pub = redis.createClient(); var sub = redis.createClient(); sub.on("subscribe", function(channel, count) { console.log("Subscribed to " + channel + ". Now subscribed to " + count + " channel(s)."); }); sub.on("message", function(channel, message) { console.log("Message from channel " + channel + ": " + message); }); sub.subscribe("tungns"); setInterval(function() { var no = Math.floor(Math.random() * 100); pub.publish('tungns', 'Generated Chat random no ' + no); }, 5000);
If you need to get your feet wet and create a simple chat application, then the following development stack works very nicely together: 如果你需要弄湿脚并创建一个简单的聊天应用程序,那么以下开发堆栈可以很好地协同工作:
The application consists of a chat room that users can join and start up a conversation. 该应用程序包含一个聊天室,用户可以加入并启动对话。 Socket.IO is responsible for emitting events when the chatter count/messages are updated and these are refreshed in the UI using jQuery.
Socket.IO负责在更新聊天计数/消息时发出事件,并使用jQuery在UI中刷新这些事件。
For the full article and the source code, check out the following link: https://scalegrid.io/blog/using-redis-with-node-js-and-socket-io/ 有关完整的文章和源代码,请查看以下链接: https : //scalegrid.io/blog/using-redis-with-node-js-and-socket-io/
The socket.io-redis says : socket.io-redis说:
By running socket.io with the socket.io-redis adapter you can run multiple socket.io instances in different processes or servers that can all broadcast and emit events to and from each other. 通过使用socket.io-redis适配器运行socket.io,您可以在不同的进程或服务器中运行多个socket.io实例,这些实例可以相互广播和发送事件。 So any of the following commands:
所以以下任何命令:
io.emit('hello', 'to all clients');
io.to('room42').emit('hello', "to all clients in 'room42' room");
io.on('connection', (socket) => {
socket.broadcast.emit('hello', 'to all clients except sender');
socket.to('room42').emit('hello', "to all clients in 'room42' room except sender");
});
will properly be broadcast to the clients through the Redis Pub/Sub mechanism. 将通过Redis Pub / Sub机制正确地向客户广播。
and I guess 而我猜
io.to(socket.id).emit('hello', "to client which has same socket.id");
would send private message in different processes or servers. 将在不同的进程或服务器中发送私人消息。
By the way, I am doing a project also need private message. 顺便说一句,我在做一个项目也需要私信。 Any other suggestions would like to be raised.
想提出任何其他建议。
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