Django and PyAMF, AMF remoting

[Arnar]

Hi folks,

Some here might be interested in the following, others - excuse this
annoyance :o)

A few folks (Nick Joyce and Thijs Triemstra mostly) are working on
PyAMF, an AMF encoder and decoder in Python. It may be considered pre-
alpha for the moment. It includes Remoting gateways for Twisted, WSGI
and now Django as well.

Exposing functions for AMF remoting is simple, define a gateway (a
dispatcher) like this:

# yourproject/yourapp/amfgateway.py

from pyamf import gateway

def echo(data):
return data

echoGateway = gateway.BaseGateway({'echo': echo}) # could include
other functions as well

and add them to urlconf via a generic view:

# yourproject/urls.py

urlpatterns = patterns('',

# AMF Remoting Gateway
(r'^gateway/', 'pyamf.gateway.djangogateway.DjangoGateway',
{'gateway':
'yourproject.yourapp.amfgateway.echoGateway'}),

)

Hope you check it out and give us a hand with testing. The project
website is http://pyamf.org/

cheers,
Arnar

ps. we are aware of DjangoAMF, PyAMF is meant as a more generic AMF
implementation - not exclusive to Django.

[Bert Heymans]

Hi Arnar,

Cool, I'm checking it out at this moment, I'd love to use it. I'm
trying out the example on the wiki here http://pyamf.org/wiki/DjangoHowto
but I can't get it to work just yet.

Maybe I did something wrong or the install script didn't behave like
it's supposed to in my environment (Mac OSX 10.4, python 2.5). I got
the PyAMF code from the subverison repository here ( svn co
http://svn.pyamf.org/pyamf/trunk pyamf )

Installing went fine (sudo python setup.py install), and the tests are
OK (python setup.py test) but somehow I can't access the django
package. This is the output I get in a terminal:

Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
[GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from pyamf.gateway.django import DjangoGateway
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "pyamf/gateway/django.py", line 37, in <module>
_thismodule = sys.modules['django']
KeyError: 'django'
>>> import pyamf.gateway
>>> dir(pyamf.gateway)
['BaseGateway', 'ServiceRequest', 'ServiceWrapper', '__builtins__',
'__doc__', '__file__', '__name__', '__path__', 'remoting', 'sys',
'traceback', 'types']

You see, no 'django' in the list. Anyway, if I look at the sourcecode
it's all there in the gateway package there's 'django', 'twisted' and
'wsgi'.

I'll post my solution when I solve the problem, but I'd appreciate it
if anyone could already give help me with some pointers :)

Bert

On Nov 9, 5:41 pm, Arnar <arna...@gmail.com> wrote:
> Hi folks,
>
> Some here might be interested in the following, others - excuse this
> annoyance :o)
>

> A few folks (Nick Joyce and Thijs Triemstra mostly) are working onPyAMF, an AMF encoder and decoder in Python. It may be considered pre-

> alpha for the moment. It includes Remoting gateways for Twisted, WSGI
> and now Django as well.
>
> Exposing functions for AMF remoting is simple, define a gateway (a
> dispatcher) like this:
>
> # yourproject/yourapp/amfgateway.py
>

> frompyamfimport gateway

>
> def echo(data):
> return data
>
> echoGateway = gateway.BaseGateway({'echo': echo}) # could include
> other functions as well
>
> and add them to urlconf via a generic view:
>
> # yourproject/urls.py
>
> urlpatterns = patterns('',
>
> # AMF Remoting Gateway
> (r'^gateway/', 'pyamf.gateway.djangogateway.DjangoGateway',
> {'gateway':
> 'yourproject.yourapp.amfgateway.echoGateway'}),
>
> )
>
> Hope you check it out and give us a hand with testing. The project

> website ishttp://pyamf.org/
>
> cheers,
> Arnar
>
> ps. we are aware of DjangoAMF,PyAMFis meant as a more generic AMF

[Arnar]

Hello Bert,

Sorry for the late reply.

On Nov 22, 3:50 pm, Bert Heymans <bert.heym...@gmail.com> wrote:
> Installing went fine (sudo python setup.py install), and the tests are
> OK (python setup.py test) but somehow I can't access the django
> package. This is the output I get in a terminal:
>
> Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.>>> from pyamf.gateway.django import DjangoGateway
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "pyamf/gateway/django.py", line 37, in <module>
> _thismodule = sys.modules['django']
> KeyError: 'django'>>> import pyamf.gateway
> >>> dir(pyamf.gateway)
>
> ['BaseGateway', 'ServiceRequest', 'ServiceWrapper', '__builtins__',
> '__doc__', '__file__', '__name__', '__path__', 'remoting', 'sys',
> 'traceback', 'types']
>
> You see, no 'django' in the list. Anyway, if I look at the sourcecode
> it's all there in the gateway package there's 'django', 'twisted' and
> 'wsgi'.

It is finding the pyamf.gateway.django package allright, the line it
fails on is in that module. Is Django on your python path?

It is due to a trick we have to use to both call our subpackage
"django" and still be able to import the real (top-level) django
package. The trick is to mess with sys.modules a bit (see the code).

Please stop by on the pyamf developers list and post us steps to
reproduce this and we'll sort it out.

cheers,
Arnar

[Bert Heymans]

Hi Arnar,

Thanks for clearing that up, that explains why it works in the context
django and not just in the python shell. I understand now, I'll stop
by the pyamf developers list for sure this week :)

Cheers,

Bert

On Nov 26, 6:50 pm, Arnar <arna...@gmail.com> wrote:
> Hello Bert,
>
> Sorry for the late reply.
>
> On Nov 22, 3:50 pm, Bert Heymans <bert.heym...@gmail.com> wrote:
>
>
>

> > Installing went fine (sudopythonsetup.py install), and the tests are
> > OK (pythonsetup.py test) but somehow I can't access thedjango

> > package. This is the output I get in a terminal:
>

> >Python2.5 (r25:51918, Sep 19 2006, 08:49:13)

> > [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin

> > Type "help", "copyright", "credits" or "license" for more information.>>> from pyamf.gateway.djangoimport DjangoGateway

>
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > File "pyamf/gateway/django.py", line 37, in <module>
> > _thismodule = sys.modules['django']
> > KeyError: 'django'>>> import pyamf.gateway
> > >>> dir(pyamf.gateway)
>
> > ['BaseGateway', 'ServiceRequest', 'ServiceWrapper', '__builtins__',
> > '__doc__', '__file__', '__name__', '__path__', 'remoting', 'sys',
> > 'traceback', 'types']
>
> > You see, no 'django' in the list. Anyway, if I look at the sourcecode
> > it's all there in the gateway package there's 'django', 'twisted' and
> > 'wsgi'.
>

> It is finding the pyamf.gateway.djangopackage allright, the line it