Re: Is it possible to use a class instance in remote methods?

Hello,

I could find in the Pyro3 documentation a solution:
It is necessary to import the class into the namespace of the server-module
too.
Adding to pyrotest_server.py

from pyrotest_client.py import ClassToSend

or

from pyrotest_client.py import *

solved my initial problem.

But in the real world I am still at a dead end. I need to use a data format
named FITS (for scientific image data), and the approach above does not
help me...

Below are the sample scripts:

'''
pyrotest_server
'''
import Pyro4

from pyfits import *
from pyfits.column import Column
from pyfits.hdu.image import PrimaryHDU
from pyfits.hdu.table import BinTableHDU

class Test(object):
    def set(self, class_in):
        #do nothing, only to check that class_in is accepted
        pass

if __name__ == '__main__':
    Pyro4.config.DOTTEDNAMES = True
    Pyro4.config.DETAILED_TRACEBACK = True
    test = Test()
    daemon=Pyro4.Daemon()       # make a Pyro daemon
    ns=Pyro4.locateNS()         # find the name server
    uri=daemon.register(test)   # register as a Pyro object
    ns.register("test", uri)    # register the object with a name in the
name server
    daemon.requestLoop()

'''
pyrotest_client.py
'''
import Pyro4
import pyfits

if __name__ == '__main__':
    test = Pyro4.Proxy("PYRONAME:test")
    #1st step of defining a binary table HDU (header-data-unit)
    #Some basic table definition for one column
    column = pyfits.Column(name='test', format='A30')
    #type is used to identify the class to import on the server side
    print 'type of column: ', type(column)
    #2nd step of defining a binary table HDU
    BinTableHDU = pyfits.new_table([column])
    #type is used to identify the class to import on the server side
    print type(BinTableHDU)
    class_to_send = BinTableHDU
    test.set(class_to_send)


I get the following console output, but I cannot make any sense out of the
traceback:

HMAC_KEY not set, protocol data may not be secure
type of column:  <class 'pyfits.column.Column'>
<class 'pyfits.hdu.table.BinTableHDU'>
HMAC_KEY not set, protocol data may not be secure
Traceback (most recent call last):
  File
"C:\Users\mdk\workspace\lr_control\src\lr_remote\pyrotest_client.py", lin
e 19, in <module>
    test.set(class_to_send)
  File "C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py",
line
149, in __call__
    return self.__send(self.__name, args, kwargs)
  File "C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py",
line
294, in _pyroInvoke
    raise data
TypeError: __new__() takes at least 2 arguments (1 given)

Any help is very welcome, thanks
Daniel


2013/3/11 Daniel Krause <m.daniel.krause-gM/[email protected]>

> Hello,
>
> I try to use a class instance in a remote method.
>
> But so far I can only use single variables of the class instance (e.g.
> method(class.variable)) in a remote method, but I can not use the class
> instance itself (method(class) is not working).
> Maybe I try something that is not intended:
> Is it possible to use remote methods with class instances, and if yes, how?
>
> Below is some code to illustrate my problem.
>
> Daniel
>
> '''
> pyrotest_server.py
> '''
> import Pyro4
>
> class Test(object):
>     def set(self, class_in):
>         self.new_class = class_in
>
> if __name__ == '__main__':
>     Pyro4.config.DOTTEDNAMES = True
>     test = Test()
>     daemon=Pyro4.Daemon()       # make a Pyro daemon
>     ns=Pyro4.locateNS()         # find the name server
>     uri=daemon.register(test)   # register as a Pyro object
>     ns.register("test", uri)    # register the object with a name in the
> name server
>     print 'test registered'
>     print "Ready."
>     daemon.requestLoop()
>
> console output:
> C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py:155:
> UserWarnin
> g: HMAC_KEY not set, protocol data may not be secure
>   warnings.warn("HMAC_KEY not set, protocol data may not be secure")
> test registered
> Ready.
>
>
> '''
> pyrotest_client.py
> '''
> import Pyro4
>
> class ClassToSend(object):
>     def __init__(self):
>         self.var1 = "variable 1"
>
> if __name__ == '__main__':
>     test = Pyro4.Proxy("PYRONAME:test")
>     class_to_send = ClassToSend()
>     try:
>         test.set(class_to_send.var1)
>         print 'test.set(class_to_send.var1) worked'
>     except Exception as e:
>         print 'exception on test.set(class_to_send.var1) occured: ', e
>     try:
>         test.set(class_to_send)
>         print 'test.set(class_to_send) worked'
>     except Exception as e:
>         print 'exception on test.set(class_to_send) occured: ', e
>     print 'done'
>
> console output:
> C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py:155:
> UserWarnin
> g: HMAC_KEY not set, protocol data may not be secure
>   warnings.warn("HMAC_KEY not set, protocol data may not be secure")
> test.set(class_to_send.var1) worked
> exception on test.set(class_to_send) occured:  'module' object has no
> attribute
> 'ClassToSend'
> done
>

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