Formatting messages to send to socket.io node.js server from python client

Question

I'm trying to get a Python client talking to a Node.js server using Socket.io 0.7, by sending a custom event to the server.

Based on the Socket.io reference I have found on GitHub, and the following WebSocket Python library.

Here's is my code so far:

Node server

io.sockets.on('connection', function (socket) {   socket.on('newimg', function(data) {         console.log(data);   }); }); 

Python client

def handshake(host, port):     u = urlopen("http://%s:%d/socket.io/1/" % (host, port))     if u.getcode() == 200:         response = u.readline()         (sid, hbtimeout, ctimeout, supported) = response.split(":")         supportedlist = supported.split(",")         if "websocket" in supportedlist:             return (sid, hbtimeout, ctimeout)         else:             raise TransportException()     else:         raise InvalidResponseException()   try:     (sid, hbtimeout, ctimeout) = handshake(HOSTNAME, PORT) #handshaking according to socket.io spec. Except Exception as e:     print e     sys.exit(1) ws = websocket.create_connection("ws://%s:%d/socket.io/1/websocket/%s" % (HOSTNAME, PORT, sid)) print ws.recv() ws.send("2::") ws.send("5:1::{'name':'newimg', 'args':'bla'}") print ws.recv() print "Closing connection" ws.close() 

Node console output

debug - client authorized info  - handshake authorized 12738935571241622933 debug - setting request GET /socket.io/1/websocket/12738935571241622933 debug - set heartbeat interval for client 12738935571241622933 debug - client authorized for  debug - websocket writing 1:: debug - websocket received data packet 2:: debug - got heartbeat packet debug - websocket received data packet 5:1::{'name':'newimg', 'args':'bla'} debug - acknowledging packet automatically debug - websocket writing 6:::1 info  - transport end debug - set close timeout for client 12738935571241622933 debug - cleared close timeout for client 12738935571241622933 debug - cleared heartbeat interval for client 12738935571241622933 debug - discarding transport  

Python console output

Done 1:: 6:::1 Closing connection 

Now it seems the socket event is not being triggered, despite the server responding with ACK. So the message is being correctly received but I am assuming, not formatted properly for socket.io to trigger an event.

I didn't think framing was necessary, however Archie1986 seems to disagree on his response to this: Socket.IO Client Library in Python

What might I be doing wrong here?

Answer 1

I wrapped rod's research into a barebones socket.io client library.

pip install -U socketIO-client python     from socketIO_client import SocketIO     with SocketIO('localhost', 8000) as socketIO:         socketIO.emit('aaa')         socketIO.wait(seconds=1) 

Answer 2

Resolved. I needed to use double quotes. Single quotes are not valid JSON. Woops.

ws.send("5:1::{'name':'newimg', 'args':'bla'}") 

Becomes:

ws.send('5:1::{"name":"newimg", "args":"bla"}')