Error initializing socket - transport.recv_packet() StopIteration

[juesato]

Hi,
I'm running a simple hello world example:

server.js

var util = require('util'),  
    http = require('http');

var app = http.createServer()

var io = require('socket.io')(app);

io.on('connection', function(socket) {
  console.log("CONNECTION!");
});

app.listen(8000);
/* server started */
console.log('> hello world running on port 8000');  

client.py

from socketIO_client import SocketIO

print "A"
socketIO = SocketIO(
    'http://localhost', 8000, verify=False)
print "HI"

The server gets to printing "CONNECTION" but the client never prints "HI". The client crashes with this traceback:

A
Traceback (most recent call last):
  File "../test.py", line 8, in <module>
    'http://localhost', 8000, verify=False)
  File "/usr/local/lib/python2.7/dist-packages/socketIO_client/__init__.py", line 353, in __init__
    resource, hurry_interval_in_seconds, **kw)
  File "/usr/local/lib/python2.7/dist-packages/socketIO_client/__init__.py", line 54, in __init__
    self._transport
  File "/usr/local/lib/python2.7/dist-packages/socketIO_client/__init__.py", line 62, in _transport
    self._engineIO_session = self._get_engineIO_session()
  File "/usr/local/lib/python2.7/dist-packages/socketIO_client/__init__.py", line 76, in _get_engineIO_session
    transport.recv_packet())
StopIteration

Do you know what could be happening here? Thanks in advance.

[juesato]

It looks like what's going on is in _get_engineIO_session (I assume this is trying to establish a connection with the server-side engineIO instance?), it's make an HTTP request to localhost:8000/socket.io where the response content is 97:0{"sid":"QK-9WUseiML1GiPQAAAj","upgrades" ["websocket"],"pingInterval":25000,"pingTimeout":60000}2:40.

This is then passed to decode_engineIO_content which is throwing an IndexError in _read_packet_length which is looking for the first 0 byte, and reading from there until a 255 byte.

I assume the issue is that the response content is incorrect, and can't be parsed correctly, but I'm not sure what the response content should look like.

@invisibleroads Would it be possible to explain what the intended purpose of this code is / how establishing the engineIO connection works? Thank you.

[juesato]

The issue was that I was using socket.io 2.0.1. Uninstalling and installing [email protected] fixed the issue.

[lucakiebel]

I searched for a solution to this problem for days, thanks a lot!

[engbaher77]

This module socketIO-client-nexus fixes issue with compatible socket version socket.io protocol 1.x
https://pypi.org/project/socketIO-client-nexus/0.7.6/
which is not backwards compatible,
if you want to communicate using socket.io protocol 0.9 please use soketIO-client 0.5.7.2
https://pypi.org/project/socketIO-client/0.5.7.2/

Don't forget to change from import socketIO-client to socketIO-client-nexus

Hope this solve your issue..