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# This program is free software; you can redistribute it and/or modify
# it under the terms of the (LGPL) GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 of the 
# License, or (at your option) any later version.
#
# This program 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 Library Lesser General Public License for more details at
# ( http://www.gnu.org/licenses/lgpl.html ).
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# written by: Jeff Ortel ( jortel@redhat.com )

"""
The plugin module provides classes for implementation
of suds plugins.
"""

from suds import *
from logging import getLogger

log = getLogger(__name__)


class Context(object):
    """
    Plugin context.
    """
    pass


class InitContext(Context):
    """
    Init Context.
    @ivar wsdl: The wsdl.
    @type wsdl: L{wsdl.Definitions}
    """
    pass


class DocumentContext(Context):
    """
    The XML document load context.
    @ivar url: The URL.
    @type url: str
    @ivar document: Either the XML text or the B{parsed} document root.
    @type document: (str|L{sax.element.Element})
    """
    pass

        
class MessageContext(Context):
    """
    The context for sending the soap envelope.
    @ivar envelope: The soap envelope to be sent.
    @type envelope: (str|L{sax.element.Element})
    @ivar reply: The reply.
    @type reply: (str|L{sax.element.Element}|object)
    """
    pass


class Plugin:
    """
    Plugin base.
    """
    pass


class InitPlugin(Plugin):
    """
    The base class for suds I{init} plugins.
    """
    
    def initialized(self, context):
        """
        Suds client initialization.
        Called after wsdl the has been loaded.  Provides the plugin
        with the opportunity to inspect/modify the WSDL.
        @param context: The init context.
        @type context: L{InitContext}
        """
        pass


class DocumentPlugin(Plugin):
    """
    The base class for suds I{document} plugins.
    """
    
    def loaded(self, context): 
        """
        Suds has loaded a WSDL/XSD document.  Provides the plugin 
        with an opportunity to inspect/modify the unparsed document. 
        Called after each WSDL/XSD document is loaded. 
        @param context: The document context. 
        @type context: L{DocumentContext} 
        """
        pass 
    
    def parsed(self, context):
        """
        Suds has parsed a WSDL/XSD document.  Provides the plugin
        with an opportunity to inspect/modify the parsed document.
        Called after each WSDL/XSD document is parsed.
        @param context: The document context.
        @type context: L{DocumentContext}
        """
        pass


class MessagePlugin(Plugin):
    """
    The base class for suds I{soap message} plugins.
    """
    
    def marshalled(self, context):
        """
        Suds will send the specified soap envelope.
        Provides the plugin with the opportunity to inspect/modify
        the envelope Document before it is sent.
        @param context: The send context.
            The I{envelope} is the envelope docuemnt.
        @type context: L{MessageContext}
        """
        pass
    
    def sending(self, context):
        """
        Suds will send the specified soap envelope.
        Provides the plugin with the opportunity to inspect/modify
        the message text it is sent.
        @param context: The send context.
            The I{envelope} is the envelope text.
        @type context: L{MessageContext}
        """
        pass
    
    def received(self, context):
        """
        Suds has received the specified reply.
        Provides the plugin with the opportunity to inspect/modify
        the received XML text before it is SAX parsed.
        @param context: The reply context.
            The I{reply} is the raw text.
        @type context: L{MessageContext}
        """
        pass
    
    def parsed(self, context):
        """
        Suds has sax parsed the received reply.
        Provides the plugin with the opportunity to inspect/modify
        the sax parsed DOM tree for the reply before it is unmarshalled.
        @param context: The reply context.
            The I{reply} is DOM tree.
        @type context: L{MessageContext}
        """
        pass
    
    def unmarshalled(self, context):
        """
        Suds has unmarshalled the received reply.
        Provides the plugin with the opportunity to inspect/modify
        the unmarshalled reply object before it is returned.
        @param context: The reply context.
            The I{reply} is unmarshalled suds object.
        @type context: L{MessageContext}
        """
        pass

    
class PluginContainer:
    """
    Plugin container provides easy method invocation.
    @ivar plugins: A list of plugin objects.
    @type plugins: [L{Plugin},]
    @cvar ctxclass: A dict of plugin method / context classes.
    @type ctxclass: dict
    """
    
    domains = {\
        'init': (InitContext, InitPlugin),
        'document': (DocumentContext, DocumentPlugin),
        'message': (MessageContext, MessagePlugin ),
    }
    
    def __init__(self, plugins):
        """
        @param plugins: A list of plugin objects.
        @type plugins: [L{Plugin},]
        """
        self.plugins = plugins
    
    def __getattr__(self, name):
        domain = self.domains.get(name)
        if domain:
            plugins = []
            ctx, pclass = domain
            for p in self.plugins:
                if isinstance(p, pclass):
                    plugins.append(p)
            return PluginDomain(ctx, plugins)
        else:
            raise Exception, 'plugin domain (%s), invalid' % name
        
        
class PluginDomain:
    """
    The plugin domain.
    @ivar ctx: A context.
    @type ctx: L{Context}
    @ivar plugins: A list of plugins (targets).
    @type plugins: list
    """
    
    def __init__(self, ctx, plugins):
        self.ctx = ctx
        self.plugins = plugins
    
    def __getattr__(self, name):
        return Method(name, self)


class Method:
    """
    Plugin method.
    @ivar name: The method name.
    @type name: str
    @ivar domain: The plugin domain.
    @type domain: L{PluginDomain}
    """

    def __init__(self, name, domain):
        """
        @param name: The method name.
        @type name: str
        @param domain: A plugin domain.
        @type domain: L{PluginDomain}
        """
        self.name = name
        self.domain = domain
            
    def __call__(self, **kwargs):
        ctx = self.domain.ctx()
        ctx.__dict__.update(kwargs)
        for plugin in self.domain.plugins:
            try:
                method = getattr(plugin, self.name, None)
                if method and callable(method):
                    method(ctx)
            except Exception, pe:
                log.exception(pe)
        return ctx