/usr/lib/python2.7/dist-packages/spyne/service.py is in python-spyne 2.11.0-2.
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# spyne - Copyright (C) Spyne contributors.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
#
"""
This module contains the :class:`ServiceBase` class and its helper objects.
"""
import logging
logger = logging.getLogger(__name__)
from spyne.util.six import add_metaclass, string_types
from spyne import EventManager
from spyne.util.oset import oset
class ServiceBaseMeta(type):
"""Creates the :class:`spyne.MethodDescriptor` objects by iterating over
tagged methods.
"""
def __init__(self, cls_name, cls_bases, cls_dict):
super(ServiceBaseMeta, self).__init__(cls_name, cls_bases, cls_dict)
self.__has_aux_methods = self.__aux__ is not None
self.public_methods = {}
self.event_manager = EventManager(self,
self.__get_base_event_handlers(cls_bases))
for k, v in cls_dict.items():
if hasattr(v, '_is_rpc'):
descriptor = v(_default_function_name=k)
# these two lines are needed for staticmethod wrapping to work
setattr(self, k, staticmethod(descriptor.function))
descriptor.reset_function(getattr(self, k))
getattr(self, k).descriptor = descriptor
descriptor.service_class = self
self.public_methods[k] = descriptor
if descriptor.aux is None:
if self.__has_aux_methods and self.__aux__ is None:
raise Exception("You can't mix primary and "
"auxiliary methods in a single service definition.")
else:
self.__has_aux_methods = True
def __get_base_event_handlers(self, cls_bases):
handlers = {}
for base in cls_bases:
evmgr = getattr(base, 'event_manager', None)
if evmgr is None:
continue
for k, v in evmgr.handlers.items():
handler=handlers.get(k, oset())
for h in v:
handler.add(h)
handlers[k]=handler
return handlers
def is_auxiliary(self):
return self.__has_aux_methods
@add_metaclass(ServiceBaseMeta)
class ServiceBase(object):
"""The ``ServiceBase`` class is the base class for all service definitions.
The convention is to have public methods defined under a subclass of this
class along with common properties of public methods like header classes or
auxiliary processors. The :func:`spyne.decorator.srpc` decorator or its
wrappers should be used to flag public methods.
It is a natural abstract base class, because it's of no use without any
method definitions, hence the 'Base' suffix in the name.
This class supports the following events:
* ``method_call``
Called right before the service method is executed
* ``method_return_object``
Called right after the service method is executed
* ``method_exception_object``
Called when an exception occurred in a service method, before the
exception is serialized.
* ``method_accept_document``
Called by the transport right after the incoming stream is parsed to
the incoming protocol's document type.
* ``method_return_document``
Called by the transport right after the outgoing object is
serialized to the outgoing protocol's document type.
* ``method_exception_document``
Called by the transport right before the outgoing exception object
is serialized to the outgoing protocol's document type.
* ``method_return_string``
Called by the transport right before passing the return string to
the client.
* ``method_exception_string``
Called by the transport right before passing the exception string to
the client.
"""
__tns__ = None
"""For internal use only. You should use the ``tns`` argument to the
:class:`spyne.application.Application` constructor to define the target
namespace."""
__in_header__ = None
"""The incoming header object that the methods under this service definition
accept."""
__out_header__ = None
"""The outgoing header object that the methods under this service definition
accept."""
__service_name__ = None
"""The name of this service definition as exposed in the interface document.
Defaults to the class name."""
__port_types__ = ()
"""WSDL-Specific portType mappings"""
__aux__ = None
"""The auxiliary method type. When set, the ``aux`` property of every method
defined under this service is set to this value. The _aux flag in the @srpc
decorator overrides this."""
@classmethod
def get_service_class_name(cls):
return cls.__name__
@classmethod
def get_service_key(cls):
return '{%s}%s' % (cls.get_tns(), cls.get_service_name())
@classmethod
def get_service_name(cls):
if cls.__service_name__ is None:
return cls.__name__
else:
return cls.__service_name__
@classmethod
def get_port_types(cls):
return cls.__port_types__
@classmethod
def get_tns(cls):
if not (cls.__tns__ is None):
return cls.__tns__
retval = cls.__module__
if cls.__module__ == '__main__':
service_name = cls.get_service_class_name().split('.')[-1]
retval = '.'.join((service_name, service_name))
return retval
@classmethod
def _has_callbacks(cls):
"""Determines if this service definition has callback methods or not."""
for method in cls.public_methods.values():
if method.is_callback:
return True
return False
@classmethod
def call_wrapper(cls, ctx):
"""Called in place of the original method call. You can override this to
do your own exception handling.
:param ctx: The method context.
The overriding function must call this function by convention.
"""
if ctx.function is not None:
if ctx.descriptor.no_ctx:
return ctx.function(*ctx.in_object)
else:
return ctx.function(ctx, *ctx.in_object)
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