Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #64005 > unrolled thread

Communicate between Python and Node.js

Back to article view | Back to comp.lang.python

Contents

  Communicate between Python and Node.js Manish <gill.manish90@gmail.com> - 2014-01-15 09:12 -0800
    Re: Communicate between Python and Node.js Chris Angelico <rosuav@gmail.com> - 2014-01-16 04:40 +1100

#64005 — Communicate between Python and Node.js

I've been tasked to write a module that sends data from Django to a Node.js server running on the same machine. Some magic happens in node and I recv the results back, which are then rendered using Django templates. 

At first I thought to use the requests library to GET/POST data to node, but I googled around and it seems lots of people think TCP sockets are the way to go. I tried implementing my own using several examples I have found online. It *kind of* works. It seems like I get blocked while trying to receive data back in the recv() loop. I never reach the end. I'm not an expert in sockets/networking, but maybe I'm not wrong in guessing it is because of the non-blocking nature of Node.js ?

A Stackoverflow post helped a little more in figuring things out (though I'm not sure if I'm correct here). Right now, I'm failing during connect() - I get "Operation now in progress". 

So my question is, how can I get recv() to work properly so that data is seamlessly passed back and forth between my Python script and the node server. Am I taking the right approach? Is there any better way? 

Relevant scripts: 
    1) http://bpaste.net/show/NI2z9RhbT3HVtLVWUKuq/ 
    2) http://bpaste.net/show/YlulEZBTDE5KS5ZvSyET/

Thanks! 

[toc] | [next] | [standalone]

#64010

On Thu, Jan 16, 2014 at 4:12 AM, Manish <gill.manish90@gmail.com> wrote:
> At first I thought to use the requests library to GET/POST data to node, but I googled around and it seems lots of people think TCP sockets are the way to go. I tried implementing my own using several examples I have found online. It *kind of* works. It seems like I get blocked while trying to receive data back in the recv() loop. I never reach the end. I'm not an expert in sockets/networking, but maybe I'm not wrong in guessing it is because of the non-blocking nature of Node.js ?

Do you need to use non-blocking sockets here? I think, from a quick
skim of your code, that you'd do better with a blocking socket. Tip:
Any time you have a sleep(1) call in your code, look to see if it's
doing the wrong thing. In this case, I'm pretty sure it is. Sleeping
for a second and then trying to read from a nonblocking socket seems
like a messy way to just read until you have what you want.

There's another thread happening at the moment about networking in
Python. You may find it of interest.

ChrisA

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web