Hi,
Ryu provides many way for such a purpose.
One is using user defined event. Please refer to the attached examples.
Usage)
$ sudo mn --topo single --mac --controller remote
...
mininet> h1 ping h2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
>From 10.0.0.1 icmp_seq=1 Destination Host Unreachable
...
$ ryu-manager ryu.app.event_sender ryu.app.event_receiver
...
*** send event: event.msg = TEST EVENT
*** Received event: ev.msg = TEST EVENT
...
Another way is using "app_manager.lookup_service_brick('APP_NAME')" method.
This method returns a RyuApp instance whose name is 'APP_NAME'.
The others are to define REST API, to use the Unix domain socket and so on.
Thanks,
Iwase
On 2015年10月13日 03:32, janael pinheiro wrote:
> Hi, everyone.
>
> I need to get the value of a variable of a running application. The value of
> this variable will be used by another application. How can I get variable
> values belonging to other applications?
>
> --
> Antonio Janael Pinheiro
> MSc. Candidate in Computer Science at CIn/UFPE
>
>
> ------------------------------------------------------------------------------
>
>
>
> _______________________________________________
> Ryu-devel mailing list
> Ryu-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/ryu-devel
>
# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ryu.app import event_sender
from ryu.base import app_manager
from ryu.controller.handler import set_ev_cls
class EventReceiver(app_manager.RyuApp):
def __init__(self, *args, **kwargs):
super(EventReceiver, self).__init__(*args, **kwargs)
@set_ev_cls(event_sender.TestEvent)
def _test_event_handler(self, ev):
self.logger.info('*** Received event: ev.msg = %s', ev.msg)
# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ryu.base import app_manager
from ryu.controller import event
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER, CONFIG_DISPATCHER
from ryu.controller.handler import set_ev_cls
class TestEvent(event.EventBase):
def __init__(self, msg):
super(TestEvent, self).__init__()
self.msg = msg
class EventSender(app_manager.RyuApp):
_EVENTS = [TestEvent]
def __init__(self, *args, **kwargs):
super(EventSender, self).__init__(*args, **kwargs)
self.mac_to_port = {}
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(
ofproto.OFPP_CONTROLLER, ofproto.OFPCML_NO_BUFFER)]
inst = [parser.OFPInstructionActions(
ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = parser.OFPFlowMod(datapath, match=match, instructions=inst)
datapath.send_msg(mod)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
event = TestEvent('TEST EVENT')
self.logger.info('*** send event: event.msg = %s', event.msg)
self.send_event_to_observers(TestEvent('TEST EVENT'))
------------------------------------------------------------------------------
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