Hi,
On 2015年06月22日 18:17, Haruka Oguchi wrote:
> Hi,
>
> I am trying to combine a ryu app that detects topology with my python
> program that calculate Dijkstra.
> But I can’t pass correct value to my python program from ryu app
> because I don’t know exactly how
> @handler.set_ev_cls(event.EventLinkAdd) handler works.
>
> ***My Ryu app that detects topology is following:***
>
> from ryu.controller import handler
> from ryu.controller import dpset
> from ryu.controller import ofp_event
> from ryu.ofproto import ofproto_v1_3
> from ryu.ofproto import ofproto_v1_3_parser
> from ryu.base import app_manager
> from ryu.ofproto.ofproto_parser import MsgBase, msg_pack_into, msg_str_attr
> from ryu.topology import api
> from ryu.topology import event
>
> class OF13(app_manager.RyuApp):
> OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
>
> _CONTEXTS = {
> 'dpset': dpset.DPSet,
> }
>
> def __init__(self, *args, **kwargs):
> super(OF13, self).__init__(*args, **kwargs)
> self.dpset = kwargs['dpset']
>
> def _get_hwaddr(self, dpid, port_no):
> return self.dpset.get_port(dpid, port_no).hw_addr
>
> @handler.set_ev_cls(event.EventLinkAdd)
> def link_add(self, ev):
> srcid, dstid = ev.link.src.dpid, ev.link.dst.dpid
> srcpt, dstpt = ev.link.src.port_no, ev.link.dst.port_no
>
> print srcid, srcpt, dstid, dstpt
> #####I would like to pass these four values to my python program.
>
> #####but this part below doesn’t work correctly.
> f = open(‘topology.txt’, ‘w’)
> print >> f, srcid, srcpt, dstid, dstpt
> f.close()
>
>
> ***The result output:***
> loading app /home/haruka/ryu/ryu/app/topo_detect.py
> loading app ryu.topology.switches
> loading app ryu.controller.ofp_handler
> instantiating app None of DPSet
> creating context dpset
> instantiating app ryu.topology.switches of Switches
> instantiating app /home/haruka/ryu/ryu/app/topo_detect.py of OF13
> instantiating app ryu.controller.ofp_handler of OFPHandler
> 4 3 3 3
> 2 2 3 2
> 1 2 3 1
> 2 3 4 2
> 1 3 4 1
> 4 1 1 3
> 2 1 1 1
> 4 2 2 3
> 1 1 2 1
> 3 3 4 3
> 3 1 1 2
> 3 2 2 2
>
>
> ***topology.txt:***
> 4 1 1 3
> #####This value changes every time I run the program above.
>
>
> I would like to ask the following questions:
> ●Why does “print srcid, srcpt, dstid, dstpt” part output multiple
> lines without the if statement nor the while statement?
Please specify 'a' for appending mode.
(https://docs.python.org/2/tutorial/inputoutput.html#reading-and-writing-files)
> ●Where should I refer to see the contents of the event handler such as
> event.EventLinkAdd?
The event classes of topology.event are defined as follows.
(https://github.com/osrg/ryu/blob/master/ryu/topology/event.py)
> ●In the first place, can Ryu Apps transfer values to other python
> program inside Ryu?
Does 'other python program inside Ryu' means other RyuApp? or Other python
process?
Ryu can do both.
> Better idea, Any suggestion will be helpful.
>
> thanks,
>
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OpManager is web-based network management software that monitors
network devices and physical & virtual servers, alerts via email & sms
for fault. Monitor 25 devices for free with no restriction. Download now
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