websockets

[shartha]

Hello. Some questions about websockets:
1) Can websockets be implemented within web2py without any in-socket server side component?

2) If yes, how is the constructor used on a local machine in the constructor, say, as: 
var ws = new WebSocket("ws://localhost/echo");

Thank you!

[Massimo Di Pierro]

On Thursday, 13 June 2013 20:36:31 UTC-5, shartha wrote:

Hello. Some questions about websockets:
1) Can websockets be implemented within web2py without any in-socket server side component?

The problem is that it needs an async server to be any useful. Rocket is not async, it is multi-threaded. 

[samuel bonilla]

Web2py + node.js

[António Ramos]

web2py + tornado

http://vimeo.com/38972256

2013/6/14 samuel bonilla <pytho...@gmail.com>

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[Roberto De Ioris]

> -

uWSGI exposes a very fast websockets api you can easily use in web2py too.

The problem is that once you complete the websocket handshake a whole
thread will remains busy until the connection is not closed.

You can reduce the problem spawning multiple threads, but you need a good
amount of memory.

This is an example echo server:

https://github.com/unbit/uwsgi/blob/master/tests/websockets_echo.py

basically you call uwsgi.websocket_handshake to ack the connection and
then you can use uwsgi.websocket_recv and uwsgi.websocket_send


--
Roberto De Ioris
http://unbit.it

[Ricardo Pedroso]

On Fri, Jun 14, 2013 at 2:36 AM, shartha <m.mirg...@gmail.com> wrote:

Hello. Some questions about websockets:
1) Can websockets be implemented within web2py without any in-socket server side component?

 

Yes. Runnig web2py with gevent or eventlet 

If you want I can post an example using socketio.

Ricardo

[shartha]

Hi Ricardo. I would love to have a functional example. Could you please make one?

Thanks!

[Ricardo Pedroso]

On Sun, Jun 16, 2013 at 1:07 AM, shartha <m.mirg...@gmail.com> wrote:

Hi Ricardo. I would love to have a functional example. Could you please make one?

Sorry for the delay.... here it goes a functional example.

 

1. Install requirements

--------------------------------

$ pip install gevent

$ pip install gevent-socketio

2. go to your web2py folder and....

--------------------------------------------------

in routes.py you need to add the socket.io endpoint, eg:

routes_in = (

    ('/socket.io/$anything', '/iochat/default/socketio/$anything'),

    ....

   )

3. copy&paste lines below into run_iochat.py

-----------------------------------------------------------------

from gevent import monkey; monkey.patch_all()

from socketio import socketio_manage

from socketio.server import SocketIOServer

from socketio.namespace import BaseNamespace

from socketio.mixins import RoomsMixin, BroadcastMixin

from gluon.main import wsgibase

if __name__ == '__main__':

    print 'Listening on port 8080'

    SocketIOServer(('0.0.0.0', 8080), wsgibase,

        resource="socket.io").serve_forever()

4. unzip attachement into web2py/applications

--------------------------------------------------------------------

the application is called iochat so make sure you don't have one.

5. return to web2py folder

-------------------------------------

execute:

$ python run_iochat.py

6. Go to appadmin (http://localhost:8080/iochat/appadmin)

------------------------------------------------------------------------------------

- register some users

- create at least one room

Now play with the chat from two different browsers. (I only try it with firefox and chromium)

I think that's all, any question feel free to ask.

Regards,

Ricardo

[shartha]

Hi Ricardo,

Thank you very much for posting the application. Here are a few questions that I have regarding this:
1. Do I need to put the route.py in the root directory of my app?

2. I tried by putting the routes.py in the rood directory of iochat. run_io_chat.py was also created in the same directory. I also included 

import sys

sys.path.append('path_to_web2py\library.zip')

at the very top of your run_io_chat.py. When I run the command python.exe run_io_chat.py, I get the error: Cannot determine web2py version.
Also when I try to visit http://127.0.0.1:8000/iochat/default/index, I get the following ticket:

<type 'exceptions.ImportError'> No module named socketio.namespace

Could you tell me what I am doing wrong?

Thanks!

[Ricardo Pedroso]

On Fri, Jun 21, 2013 at 6:14 PM, shartha <m.mirg...@gmail.com> wrote:

Hi Ricardo,

Thank you very much for posting the application. Here are a few questions that I have regarding this:
1. Do I need to put the route.py in the root directory of my app?

2. I tried by putting the routes.py in the rood directory of iochat. run_io_chat.py was also created in the same directory. I also included 

routes.py and run_io_chat.py in the web2py folder not in the app folder.

 

import sys

sys.path.append('path_to_web2py\library.zip')

at the very top of your run_io_chat.py. When I run the command python.exe run_io_chat.py, I get the error: Cannot determine web2py version.
Also when I try to visit http://127.0.0.1:8000/iochat/default/index, I get the following ticket:

<type 'exceptions.ImportError'> No module named socketio.namespace

You should use web2py sources (not the binary one) and install gevent and gevent-sockeio.

Also the port defined in run_io_chat.py, if you do not change it, is 8080.

Ricardo

[shartha]

Thank you Recardo. I am sorry for being late to reply back. I appreciate your time and help. 

[bha...@kivacybersecurities.com]

Hii Ricardo,

[Ruud Schroen]

Web2Py seems to start, but everytime i load the page i get a ticket.

When i try to open the ticket it says:

admin disabled because unable to access password file

My routes.py is like this:

routes_in = (

    ('/socket.io/$anything', '/iochat/default/socketio/$anything'),

)

[黄祥]

i've followed the steps but end it with an error occured :

running run_iochat.py from terminal

(site)MacBook:~ MacBookPro$ python ~/site/web2py/run_iochat.py

Traceback (most recent call last):

  File "/Users/MacBookPro/site/web2py/run_iochat.py", line 8, in <module>

    from gluon.main import wsgibase

  File "/Users/MacBookPro/site/web2py/gluon/main.py", line 121, in <module>

    raise RuntimeError("Cannot determine web2py version")

RuntimeError: Cannot determine web2py version

when tried to access from web2py site

Traceback (most recent call last):
  File "/Users/MacBookPro/site/web2py/gluon/restricted.py", line 227, in restricted
    exec ccode in environment
  File "/Users/MacBookPro/site/web2py/applications/iochat/models/db.py", line 14, in <module>
    import chat
  File "/Users/MacBookPro/site/web2py/gluon/custom_import.py", line 85, in custom_importer
    modules_prefix, globals, locals, [itemname], level)
  File "applications/iochat/modules/chat.py", line 8, in <module>
    from gluon.dal import DAL, BaseAdapter, Field
ImportError: cannot import name BaseAdapter

any idea or solution for this?

thanks and best regards,

stifan

[Massimo Di Pierro]

I think it is in 

from pydal.adapters.base import BaseAdapter