If this is more of an engine.io or socket.io question, I apologize in
advance...
I am working on getting nodejs / socket.io / express running on busybox
linux on an ARMv5TE processor. I have nodejs up and running and the
following code runs without errors.
var app = require('express')();var server = require('http').Server(app);var io
= require('socket.io')(server);
server.listen(80);
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');});
io.on('connection', function (socket) {
socket.emit('news', { hello: 'world' });
socket.on('my other event', function (data) {
console.log(data);
});});
Until I try to connect via websocket from a client. From the browser (with
the client script socket.io.jsloaded), var socket =
io.connect('ws://192.168.1.8:3000'); or var socket =
io.connect('http://192.168.1.8:3000');. Node then logs this error to the
console and stops:
buffer.js:784
throw TypeError('value is out of bounds');
TypeError: value is out of bounds
at TypeError (<anonymous>)
at checkInt (buffer.js:784:11)
at Buffer.writeInt32BE (buffer.js:924:5)
at Base64Id.generateId
(/usr/lib/node_modules/socket.io/node_modules/engine.io/node_modules/base64id/lib/base64id.js:88:8)
at Server.handshake
(/usr/lib/node_modules/socket.io/node_modules/engine.io/lib/server.js:222:21)
at
/usr/lib/node_modules/socket.io/node_modules/engine.io/lib/server.js:184:12
at Server.checkRequest (/usr/lib/node_modules/socket.io/lib/index.js:67:51)
at Server.verify
(/usr/lib/node_modules/socket.io/node_modules/engine.io/lib/server.js:127:17)
at Server.handleRequest
(/usr/lib/node_modules/socket.io/node_modules/engine.io/lib/server.js:174:8)
at Server.<anonymous>
(/usr/lib/node_modules/socket.io/node_modules/engine.io/lib/server.js:362:12)
Running the same node server from my desktop computer (Windows 8 64 bit),
does not produce this error.
I can trace the error to these lines of code in
node_modules/socket.io/node_modules/engine.io/node_modules/base64id/lib/base64id.js
:
Base64Id.prototype.generateId = function () {
var rand = new Buffer(15); // multiple of 3 for base64
if (!rand.writeInt32BE) {
return Math.abs(Math.random() * Math.random() * Date.now() |
0).toString() + Math.abs(Math.random() * Math.random() * Date.now() |
0).toString();
}this.sequenceNumber = (this.sequenceNumber + 1) | 0;
rand.writeInt32BE(this.sequenceNumber, 11);...
If I change rand.writeInt32BE(this.sequenceNumber, 11); to
rand.writeInt32BE(this.sequenceNumber,
11, true);, the error goes away and I can continue on without problems
(presumably). So:
- Why does this error occur when running my code from the ARMv5TE
machine?
- Is my change to base64id.js safe or appropriate?
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