1 # copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

     2 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

     3 #

     4 # This file is part of CubicWeb.

     5 #

     6 # CubicWeb is free software: you can redistribute it and/or modify it under the

     7 # terms of the GNU Lesser General Public License as published by the Free

     8 # Software Foundation, either version 2.1 of the License, or (at your option)

     9 # any later version.

    10 #

    11 # CubicWeb is distributed in the hope that it will be useful, but WITHOUT

    12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

    13 # FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

    14 # details.

    15 #

    16 # You should have received a copy of the GNU Lesser General Public License along

    17 # with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

    18 """Source to query another RQL repository using pyro"""

    19 

    20 __docformat__ = "restructuredtext en"

    21 _ = unicode

    22 

    23 from functools import partial

    24 import zmq

    25 

    26 

    27 # XXX hack to overpass old zmq limitation that force to have

    28 # only one context per python process

    29 try:

    30     from cubicweb.server.cwzmq import ctx

    31 except ImportError:

    32     ctx = zmq.Context()

    33 

    34 class ZMQRepositoryClient(object):

    35     """

    36     This class delegate the overall repository stuff to a remote source.

    37 

    38     So calling a method of this repository will results on calling the

    39     corresponding method of the remote source repository.

    40 

    41     Any raised exception on the remote source is propagated locally.

    42 

    43     ZMQ is used as the transport layer and cPickle is used to serialize data.

    44     """

    45 

    46     def __init__(self, config, vreg=None):

    47         self.config = config

    48         self.vreg = vreg

    49         self.socket = ctx.socket(zmq.REQ)

    50         self.host = config.get('base-url')

    51         self.socket.connect(self.host)

    52 

    53     def __zmqcall__(self, name, *args, **kwargs):

    54          self.socket.send_pyobj([name, args, kwargs])

    55          result = self.socket.recv_pyobj()

    56          if isinstance(result, BaseException):

    57              raise result

    58          return result

    59 

    60     def __getattr__(self, name):

    61         return partial(self.__zmqcall__, name)