def dispatch(self, message, incomingmessageid):
"""
Unwrappes the message and tries to deliver directly, or if not possible through another routing hop.
"""
## print "\tRouting Dispatcher: Received something to pass on."
from g4dslogging import getDefaultLogger, COMMUNICATION_INCOMING_MSG_DETAILS
getDefaultLogger().newMessage(COMMUNICATION_INCOMING_MSG_DETAILS, '-- Control Msg - SS: Routing Engine')
from messagewrapper import getControlMessageWrapper
action, sucess, args, unwrapped = getControlMessageWrapper().unwrapSSRoutingMessage(message)
destination = args['destination']
protocol = args['protocol']
community = args['community']
from authorisationcontroller import getAuthorisationController
from messagehandler import getMessageContextController
sourceCommunity = getMessageContextController().getValue(incomingmessageid, 'communityid')
## # let's check, whether the sender of this message is allowed to route into the community
## if not getAuthorisationController().validate(getMessageContextController().getValue(incomingmessageid, 'senderid'),
## sourceCommunity, 'g4ds.routing.route'):
## return
from communitymanager import getMemberManager
# check first, whether we are the final receipient
if getMemberManager().getLocalMember().getId() == destination:
# great stuff - pass it to the global dispatcher
from messagehandler import getGlobalDispatcher
getGlobalDispatcher().dispatch(protocol, unwrapped)
else:
args = {}
args['destination'] = destination
args['protocol'] = protocol
args['community'] = community
from messagewrapper import getControlMessageWrapper
wrapped, doc, element = getControlMessageWrapper().wrapSSRoutingMessage('1', args = args, data = unwrapped)
from g4dsconfigurationcontroller import getOutgoingControlMessagesHandler, CONTROL_ROUTER
# check, whether we can reach the dest community directly
try:
getMemberManager().getLocalMember().getCommunityIds().index(community)
# great to know; but are we allowed this action?
if not getAuthorisationController().validate(getMemberManager().getLocalMember().getId(), community, 'g4ds.routing.route'):
raise ValueError('I am in the dest community; but I am not allowed to route into it. Let us try to find somebody else.')
# unfortunately, we can only check the dest tc with the access control - let's check for scr / dest combination additionally
for gw in getMemberManager().getLocalMember().getGateways():
if gw.getSourceCommunityId() == sourceCommunity and gw.getDestinationCommunityId() == community:
getOutgoingControlMessagesHandler().sendMessage(destination, CONTROL_ROUTER, "Routing message", wrapped, communityid = community)
raise ValueError('I am in the dest community; but I am not allowed to route into it. Let us try to find somebody else.')
except ValueError, msg:
# ok - looks like we can only pass it on to the next hop
gateway_member_id, peercommunity, hops = getRoutingTableManager().getNexthopForCommunity(community)
# are we allowed this action then?
if not getAuthorisationController().validate(getMemberManager().getLocalMember().getId(), peercommunity, 'g4ds.routing.route'):
return
# ah, fair enough - is it also allowed for the combination src TC / dst TC?
for gw in getMemberManager().getLocalMember().getGateways():
if gw.getSourceCommunityId() == sourceCommunity and gw.getDestinationCommunityId() == peercommunity:
getOutgoingControlMessagesHandler().sendMessage(gateway_member_id, CONTROL_ROUTER, "Routing message", wrapped, communityid = peercommunity)
def dispatch(self, protocol, message):
"""
Passes messages to the GlobalDispatcher in the messagehandler module.
@param protocol: Name of the protocol, which has been identified as carrier for the message
@type protocol: C{String}
@param message: Message itself
@type message: C{String}
"""
from messagehandler import getGlobalDispatcher
getGlobalDispatcher().dispatch(protocol, message)
