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POHow do I store persistent data with xhr-polling in Socket.IO?
 

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  1. POHow do I store persistent data with xhr-polling in Socket.IO?
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    <p>I'm writing a multi-room chat app with Node.js and Socket.IO and I'm wondering how to handle data that needs to persist for the duration of a session, when the transport is xhr-polling.</p> <p>Currently, on the client I'm sending a "join" event on connection, which passes a long a few variables (such as username), which I store server-side using Socket.IO's get and set methods. They are then available until the client disconnects.</p> <p>This works fine if the transport is Websockets, but if it falls back to xhr-polling, the join event is emitted on each connect, which happens every 5-10 seconds. (Similarly, "such and such has left/joined the room" is sent on each xhr-poll request, which is also undesirable.)</p> <p>I'm not sure what the best way forward is. I can't disable xhr-polling as it's a needed fallback for flashless IE for one.</p> <p>Here is the relevant client code:</p> <pre><code>socket.on("connect", function(){ socket.emit("join", { username: username, room: room }); }); </code></pre> <p>And on the server:</p> <pre><code>var io = require("socket.io").listen(8124) , buffer = {} , max_room_buffer = 15; io.sockets.on("connection", function(socket) { socket.on("join", function(data){ if(data.username &amp;&amp; data.room) { socket.set("data", data); socket.join(data.room); if(!buffer[data.room]) buffer[data.room] = []; socket.broadcast.to(data.room).emit("message", "&lt;em&gt;" + data.username + " has joined room " + data.room + "&lt;/em&gt;"); socket.emit("message", "&lt;em&gt;You have joined room " + data.room + "&lt;/em&gt;"); socket.emit("message", buffer[data.room]); } }); socket.on("message", function(message) { if(message) { socket.get("data", function(err, data){ if(data) { var msg = "&lt;span&gt;" + data.username + ":&lt;/span&gt; " + message; buffer[data.room].push(msg); if(buffer[data.room].length &gt; max_room_buffer) buffer[data.room].shift(); io.sockets.in(data.room).emit("message", msg); } }); } }); socket.on("disconnect", function () { socket.get("data", function(err, data){ if(data) { socket.leave(data.room); socket.broadcast.to(data.room).emit("message", "&lt;em&gt;" + data.username + " has left room " + data.room + "&lt;/em&gt;"); } }); }); }); </code></pre> <p>Thanks in advance.</p>
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      1. POHow do I store persistent data with xhr-polling in Socket.IO?
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      1. POHow do I store persistent data with xhr-polling in Socket.IO?
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      1. POHow do I store persistent data with xhr-polling in Socket.IO?
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    1. COI think shouldn't the socket.io itself handle that instead of the developer handle it.. weird.
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      1. POHow do I store persistent data with xhr-polling in Socket.IO?
      1. USRishav Rastogi
    2. COI guess something like chunked transfer encoding , would be supported not sure if "AJAX multipart streaming" , not sure if its the same thing
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      1. POHow do I store persistent data with xhr-polling in Socket.IO?
      1. USRishav Rastogi
    3. COI thought that this must be an issue every chat app runs into with socket.io but I can't seem to find anything on it on Google. There's probably a best practice for dealing with this but I'm new to socket.io.
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      1. POHow do I store persistent data with xhr-polling in Socket.IO?
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