Hi,
I think, it seems can be realized by "ofp_event.EventOFPStateChange".
I've done a quick & dirty hack for this purpose.I hope this will help.
sw_register.py
---------------------------------
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller import handler
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 import dpid as dpid_lib
class Register(app_manager.RyuApp):
def __init__(self):
super(Register, self).__init__()
self.sw_list = {}
@set_ev_cls(ofp_event.EventOFPStateChange,
[handler.MAIN_DISPATCHER, handler.DEAD_DISPATCHER])
def dispacher_change(self, ev):
assert ev.datapath is not None
dp = ev.datapath
if ev.state == handler.MAIN_DISPATCHER:
self.sw_list[dp.id] = dp
msg = 'Join SW.'
elif ev.state == handler.DEAD_DISPATCHER:
ret = self.sw_list.pop(dp.id, None)
if ret is None:
msg = 'Leave unknown SW.'
else:
msg = 'Leave SW.'
self.logger.info('dpid=%s : %s %s', dpid_lib.dpid_to_str(dp.id), msg,
self.sw_list)
---------------------------------
$ ryu-manager sw_register.py
loading app sw_register.py
loading app ryu.controller.ofp_handler
instantiating app sw_register.py of Register
instantiating app ryu.controller.ofp_handler of OFPHandler
<SW startup>
dpid=0000000000000002 : Join SW. {2: <ryu.controller.controller.Datapath object
at 0x7f7298f2b7d0>}
dpid=0000000000000001 : Join SW. {1: <ryu.controller.controller.Datapath object
at 0x7f7298f2be10>, 2: <ryu.controller.controller.Datapath object at
0x7f7298f2b7d0>}
<SW stopped>
dpid=0000000000000002 : Leave SW. {1: <ryu.controller.controller.Datapath
object at 0x7f7298f2be10>}
dpid=0000000000000001 : Leave SW. {}
On 2014年11月27日 15:34, Weiyang Mo wrote:
> Hi
>
> Is there any simple way to get all the Datapath instances (e.g. a list?) that
> I can send to a specific one. For example I have two switches dpid=1 and
> dpid=2, I receiver packet_in from dpid=1 and wants to do something on dpid2.
>
> @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
> def _packet_in_handler(self, ev):
> ev.msg.datapath.id == 1 True
> #I want send some msg to dpid 2, How can I access dpid instance?
>
> Thank you very much.
>
> William
>
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