Comments on Just a little Python: Gevent, ZeroMQ, WebSockets, and Flot FTW!

Great news! Thanks for sharing this!

2013-01-23T10:00:45.595-05:00

Great news! Thanks for sharing this!

> you'll need to have libzmq-dev 2.1+ This...

2013-01-23T03:48:00.126-05:00

> you'll need to have libzmq-dev 2.1+

This is no longer true for pyzmq 2.2. See http://pypi.python.org/pypi/pyzmq-static/2.2

IvanZ - thanks for the comment. One of the reasons...

2013-01-20T21:36:37.416-05:00

IvanZ - thanks for the comment. One of the reasons I had the producer going over the network, if I recall correctly, was to imagine how one would 'scale out' such a solution to run on multiple servers. In this case, it's certainly a case of over-architecting the solution, however.

But server can be removed if producer publishes di...

2013-01-19T06:19:37.151-05:00

But server can be removed if producer publishes directly to inproc:

Hi Anonymous ;-) Thanks for the comment. One appr...

2012-12-06T13:32:18.886-05:00

Hi Anonymous ;-)

Thanks for the comment. One approach to getting a session ID is having the server send a user id to the browser on connect (or vice-versa) and storing it. So you'd have a 'sessionid' message or something like that which you would emit() from the server, listening for that event in JS.

You might also want to check out http://blog.pythonisito.com/2012/07/realtime-web-chat-with-socketio-and.html for a tutorial on a more-recent version of socket.io.

Thanks again!

Hi Rick, Thanks for the post. How can I get the ...

2012-12-05T08:06:24.925-05:00

Hi Rick,

Thanks for the post.
How can I get the session ID of a connection (user) when the connection established to the web socket, from JS code?

Thanks for taking the time to work through this, a...

2012-07-29T19:59:14.629-04:00

Thanks for taking the time to work through this, and thanks for the comment!

I can tell you why you did that, having used this ...

2012-07-29T16:33:46.218-04:00

I can tell you why you did that, having used this article as a base for my own work.

If you attempt multiple zmq connections to the same TCP endpoint within the same process, they will fail with an "address already in use" error.

So this must be why you stuck the "inproc://queue" hop in there. I tried to take it out and hit the problem I just mentioned, so have reinstated it and now everything works like a charm :)

Thanks for the article. Very useful.

My guess is that somehow you're running either...

2012-07-12T10:32:18.722-04:00

My guess is that somehow you're running either a) with different versions of packages that I used, or b) without the correct WSGI server. I am planning on a new blog post covering the latest version of socket.io in the near future, so stay tuned!

Hi Rick. The websocket example above works fine, ...

2012-07-11T19:05:26.806-04:00

Hi Rick.

The websocket example above works fine, but when I try to run the socketio example I get an KeyError: 'socketio' on line 61 ("socketio = environ['socketio']"). This happens on both the Windows and the Ubuntu platform. Can you please help me resolve this issue since I have no clue how to fix it.

Thanks for the question! Honestly, it's been s...

2012-06-06T17:25:47.428-04:00

Thanks for the question! Honestly, it's been several months since I looked at this code and I don't know why I did that, either. The WebSocketApp *should* be able to directly subscribe to port 5000, I think.

Why do we need zmq_server() to retransmit the mess...

2012-06-06T17:04:15.671-04:00

Why do we need zmq_server() to retransmit the messages. Can't we just connect the socket in WebSocketApp to tcp://*:5000?

By the way, I've put the working code up on my...

2011-07-28T22:16:33.776-04:00

By the way, I've put the working code up on my SourceForge homepage http://sf.net/u/rick446/gevent-socketio/ if you'd like to clone it from there. The latest version uses socket.io instead of "raw" websockets for more portability. I'll try to write that up soon.

Thanks for the comments! @CD Simpson: I did very ...

2011-07-25T10:23:10.303-04:00

Thanks for the comments!

@CD Simpson: I did very little investigation of the other long-polling options. I will probably be looking into socket.io that @Klaus Lönze mentioned (there's a gevent-socketio package) and doing another post. I believe that socketio will do all sorts of graceful degradation even down to flash based on your browser.

@Hridas: I've done some things with RabbitMQ for our work on Allura (http://sf.net/p/allura). RabbitMQ is nice, but as I mentioned, it requires a broker and it's quite a bit more complex to get set up. I believe there are some browser-side integrations with RabbitMQ (google for Stomp RabbitMQ), but I've never used them.

Nice integration. I'm looking for the simila...

2011-07-25T06:07:18.741-04:00

Nice integration.

I'm looking for the similar integration with RabbitMQ for a while, But I didn't got one. Any way your post helped me to get an Idea about 0MQ features. The socket handling was very nice, RabbitMQ missing that part I think ...:(

If you have any Idea about RabbiMQ please share.

Thank you,
Haridas N.

You prolly know this one already, but I recommend ...

2011-07-24T04:45:01.807-04:00

You prolly know this one already, but I recommend http://socket.io/ for a cross-browser websocket implementation.

As somebody that has been fighting WebSockets for ...

2011-07-24T03:48:55.974-04:00

As somebody that has been fighting WebSockets for the past few months, I'm curious: Have you investigated other long-polling options, like Comet, Athena, Minerva, etc.?

I should point out that this was tested in Chrome ...

2011-07-23T18:45:01.965-04:00

I should point out that this was tested in Chrome only; I know that Firefox and Opera disabled WebSockets. YMMV.