Hi Satoshi,
Thank you so much for the response.
My end goal is to pass a flow to the switch as soon as its up using OFv1.3.
I have written the following snippet of code but Im not sure where I am
going wrong. I would be obliged if you could help me out in this regard.
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.topology import switches
from ryu.topology.event import EventSwitchEnter, EventSwitchLeave
class SwitchEventApp(app_manager.RyuApp):
_CONTEXTS = {
'switches': switches.Switches,
}
@set_ev_cls(EventSwitchEnter)
def _ev_switch_enter_handler(self, ev):
print('enter: %s' % ev)
datapath = ev.msg.datapath (---->error on this line)
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0, match, actions)
def add_flow(self, datapath, priority, match, actions):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match = match, instructions=inst)
datapath.send_msg(mod)
The error I get is as follows:
ryu@ryu-vm:~/Desktop$ ryu-manager testSwitch.py
loading app testSwitch.py
loading app ryu.controller.ofp_handler
creating context switches
instantiating app testSwitch.py
instantiating app ryu.controller.ofp_handler
enter: EventSwitchEnter<dpid=427128799416224, 2 ports>
hub: uncaught exception: Traceback (most recent call last):
File "/home/ryu/ryu/ryu/lib/hub.py", line 48, in _launch
func(*args, **kwargs)
File "/home/ryu/ryu/ryu/base/app_manager.py", line 110, in _event_loop
handler(ev)
File "/home/ryu/Desktop/testSwitch.py", line 19, in
_ev_switch_enter_handler
datapath = ev.msg.datapath
AttributeError: 'EventSwitchEnter' object has no attribute 'msg'
I would be extremely obliged if you could help me here.
Regards,
Vinay Pai B.H.
On Tue, Feb 11, 2014 at 10:06 PM, Satoshi Kobayashi <
[email protected]> wrote:
> Hi Vinay,
>
> You can use EventSwitchEnter and EventSwitchLeave.
> (Note that this API is supported only by OpenFlow 1.0 and 1.3)
>
> ----------
> from ryu.base import app_manager
> from ryu.controller.handler import set_ev_cls
> from ryu.topology import switches
> from ryu.topology.event import EventSwitchEnter, EventSwitchLeave
>
> class SwitchEventApp(app_manager.RyuApp):
>
> _CONTEXTS = {
> 'switches': switches.Switches,
> }
>
> @set_ev_cls(EventSwitchEnter)
> def _ev_switch_enter_handler(self, ev):
> print('enter: %s' % ev)
>
> @set_ev_cls(EventSwitchLeave)
> def _ev_switch_leave_handler(self, ev):
> print('leave: %s' % ev)
>
> ----------
>
> Regards,
> Satoshi
>
>
>
> 2014-02-12 12:27 GMT+09:00 vinay pai <[email protected]>:
>
>> Hi All,
>>
>> I am traditionally a POX user and am more familiar with the APIs used
>> there. I have recently started using Ryu and am finding difficulty in
>> finding the appropriate APIs. In POX there is an API which is called when a
>> switch connects to the controller. It is _handle_ConnectionUp(). I am
>> searching for an equivalent event in Ryu. Should I be
>> using ryu.controller.handler.set_ev_cls(ev_cls, dispatchers=None) which the
>> negotiation phase as ryu.controller.handler.MAIN_DISPATCHER? or am I
>> missing a straight forward API.
>>
>> Apologies if the question has a very straight forward answer that I might
>> be missing out.
>>
>> Regards,
>>
>> Vinay Pai B.H.
>>
>> --
>> Vinay Pai B.H.
>> Grad Student - Computer Science
>> Viterbi School of Engineering
>> University of Southern California
>> Los Angeles, CA, USA
>>
>>
>> ------------------------------------------------------------------------------
>> Android apps run on BlackBerry 10
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>> [email protected]
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>>
>>
>
>
> --
> Satoshi Kobayashi <[email protected]>
>
--
Vinay Pai B.H.
Grad Student - Computer Science
Viterbi School of Engineering
University of Southern California
Los Angeles, CA, USA
------------------------------------------------------------------------------
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Introducing the new BlackBerry 10.2.1 Runtime for Android apps.
Now with support for Jelly Bean, Bluetooth, Mapview and more.
Get your Android app in front of a whole new audience. Start now.
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