Hi Iwase and thank you for getting back to me. The author of this program,
Dr Bernstein added this line "from ryu.cmd import manager" which as far as
I understand directly starts Ryu from within side
L2DestForwardStaticRyu.py. Should be around line 29 I think. He had to do
this he told me because he could not start the program in the conventional
way because he needed to import the "ExNetwithLoops!A.json file" for the
topology with static mac and IP addresses. Apparently he could not do this
just using the standard Ryu format of starting the Ryu Manager with the
Controller file and then with REST.
I tried your suggestion by removing "manager.main(args=sys.argv)"
from " if __name__ == "__main__": "
and using the following:-
"manager.main(args=sys.argv + ['ryu.app.ofctl_rest'])" and I got the
following error message in the terminal.
"l2DestForwardStaticRyuNS: error: unrecognized arguments:
ryu.app.ofctl_rest"
Any advice would be welcome. I am obviously going to see what I can find
here and will let you know if I find anything relevant.
Cheers
Douglas
On 13 June 2017 at 02:17, Iwase Yusuke <iwase.yusu...@gmail.com> wrote:
> Hi Douglas,
>
> I checked "L2DestForwardStaticRyu.py", and it seems to be "hacked" to run
> app without "ryu-manager".
> To start the built-in Ryu application with "L2DestForwardStaticRyu.py",
> how about the following?
> The following appends to "ofctl_rest" app to the argument of "manager".
>
> e.g.) around line 91:
>
> if __name__ == "__main__":
> - manager.main(args=sys.argv)
> + manager.main(args=sys.argv + ['ryu.app.ofctl_rest'])
>
>
> Thanks,
> Iwase
>
>
> On 2017年06月09日 21:00, Douglas Harewood-Gill wrote:
> > Hi Iwase. Thank you for contacting me and apologies for my delay in
> responding. I have tried what you have suggested but the problem I have is
> that the L2DestForwardStaticRyu.py program is designed to run on its own.
> It imports the the ryu.cmd import manager and uses the Ryu controller but
> you start it by typing "|python l2DestForwardStaticRyu.py
> --netfile=ExNetwithLoops1A.json" |where it imports
> =ExNetWithLoops1A.Json.
> > When this program is started, it automatically loads Ryu and implements
> the code within this program. I am not sure how to start the this and
> ryu.app.ofctl_rest at the same time. I have tried starting them separately
> in different terminals but that did not work.
> >
> > Thank you also for the information you have sent. I have looked at it
> before but I do not know how to implement this with my custom code. I have
> been looking for examples but they seem to be few and far between. Any
> advice as always would be greatly appreciated.
> >
> > Thanks again.
> >
> > Douglas
> >
> > On 8 June 2017 at 01:27, Iwase Yusuke <iwase.yusu...@gmail.com <mailto:
> iwase.yusu...@gmail.com>> wrote:
> >
> > Hi Douglas,
> >
> > Excuse me for cutting in.
> >
> > Just for getting flow statistics, how about running your app and
> ofctl_rest
> > together as Fujimoto said.
> > e.g.)
> > $ ryu-manager your_app.py ryu.app.ofctl_rest
> >
> >
> > If you want to implement your own REST APIs on your app, Ryu-Book is
> the
> > most helpful as far as I know.
> > (You might already be aware of this though...)
> > http://osrg.github.io/ryu-book/en/html/rest_api.html <
> http://osrg.github.io/ryu-book/en/html/rest_api.html>
> >
> >
> > FYI, here is an sample implementation on simple_switch_13.py for
> getting
> > flow statistics.
> > The usage of "WSGI" framework is described on Ryu-Book.
> >
> >
> > $ git diff
> > diff --git a/ryu/app/simple_switch_13.py
> b/ryu/app/simple_switch_13.py
> > index 3e7c598..f33e474 100644
> > --- a/ryu/app/simple_switch_13.py
> > +++ b/ryu/app/simple_switch_13.py
> > @@ -13,6 +13,8 @@
> > # See the License for the specific language governing permissions
> and
> > # limitations under the License.
> >
> > +import json
> > +
> > from ryu.base import app_manager
> > from ryu.controller import ofp_event
> > from ryu.controller.handler import CONFIG_DISPATCHER,
> MAIN_DISPATCHER
> > @@ -21,14 +23,26 @@ from ryu.ofproto import ofproto_v1_3
> > from ryu.lib.packet import packet
> > from ryu.lib.packet import ethernet
> > from ryu.lib.packet import ether_types
> > +from ryu.app.ofctl import api as ofctl_api
> > +from ryu.app.wsgi import ControllerBase
> > +from ryu.app.wsgi import Response
> > +from ryu.app.wsgi import route
> > +from ryu.app.wsgi import WSGIApplication
> > +
> > +
> > +_URI_PREFIX = '/simpleswitch/stats/{dpid}'
> >
> >
> > class SimpleSwitch13(app_manager.RyuApp):
> > OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
> > + _CONTEXTS = {'wsgi': WSGIApplication}
> >
> > def __init__(self, *args, **kwargs):
> > super(SimpleSwitch13, self).__init__(*args, **kwargs)
> > self.mac_to_port = {}
> > + wsgi = kwargs['wsgi']
> > + wsgi.register(SimpleSwitchController,
> > + {SimpleSwitch13.__name__: self})
> >
> > @set_ev_cls(ofp_event.EventOFPSwitchFeatures,
> CONFIG_DISPATCHER)
> > def switch_features_handler(self, ev):
> > @@ -117,3 +131,32 @@ class SimpleSwitch13(app_manager.RyuApp):
> > out = parser.OFPPacketOut(datapath=datapath,
> buffer_id=msg.buffer_id,
> > in_port=in_port, actions=actions,
> data=data)
> > datapath.send_msg(out)
> > +
> > + def get_flow_stats(self, dpid):
> > + datapath = ofctl_api.get_datapath(self, dpid)
> > + if datapath is None:
> > + return None
> > +
> > + parser = datapath.ofproto_parser
> > + req = parser.OFPFlowStatsRequest(datapath)
> > +
> > + rep = ofctl_api.send_msg(
> > + app=self, msg=req,
> > + reply_cls=parser.OFPFlowStatsReply, reply_multi=True)
> > + return [r.to_jsondict() for r in rep]
> > +
> > +
> > +class SimpleSwitchController(ControllerBase):
> > +
> > + def __init__(self, req, link, data, **config):
> > + super(SimpleSwitchController, self).__init__(req, link,
> data, **config)
> > + self.simple_switch_app = data[SimpleSwitch13.__name__]
> > +
> > + @route('simpleswitch', _URI_PREFIX, methods=['GET'])
> > + def list_mac_table(self, req, **kwargs):
> > + dpid = int(str(kwargs['dpid']))
> > + ret = self.simple_switch_app.get_flow_stats(dpid)
> > + if ret is None:
> > + return Response(status=404)
> > +
> > + return Response(content_type='application/json',
> body=json.dumps(ret))
> >
> >
> > $ ryu-manager ryu/app/simple_switch_13.py
> > Registered VCS backend: git
> > Registered VCS backend: hg
> > Registered VCS backend: svn
> > Registered VCS backend: bzr
> > loading app ryu/app/simple_switch_13.py
> > loading app ryu.controller.ofp_handler
> > loading app ryu.app.ofctl.service
> > loading app ryu.controller.ofp_handler
> > creating context wsgi
> > instantiating app ryu.app.ofctl.service of OfctlService
> > instantiating app ryu/app/simple_switch_13.py of SimpleSwitch13
> > instantiating app ryu.controller.ofp_handler of OFPHandler
> > (10332) wsgi starting up on http://0.0.0.0:8080
> > ...
> >
> >
> > $ curl -X GET http://localhost:8080/simpleswitch/stats/1 <
> http://localhost:8080/simpleswitch/stats/1> | python -m json.tool
> > [
> > {
> > "OFPFlowStatsReply": {
> > "body": [
> > {
> > "OFPFlowStats": {
> > "byte_count": 140,
> > "cookie": 0,
> > "duration_nsec": 771000000,
> > "duration_sec": 1,
> > "flags": 0,
> > "hard_timeout": 0,
> > "idle_timeout": 0,
> > "instructions": [
> > {
> > "OFPInstructionActions": {
> > "actions": [
> > {
> > "OFPActionOutput": {
> > "len": 16,
> > "max_len": 65535,
> > "port": 4294967293,
> > "type": 0
> > }
> > }
> > ],
> > "len": 24,
> > "type": 4
> > }
> > }
> > ],
> > "length": 80,
> > "match": {
> > "OFPMatch": {
> > "length": 4,
> > "oxm_fields": [],
> > "type": 1
> > }
> > },
> > "packet_count": 2,
> > "priority": 0,
> > "table_id": 0
> > }
> > }
> > ],
> > "flags": 0,
> > "type": 1
> > }
> > }
> > ]
> >
> >
> > Thanks,
> > Iwase
> >
> >
> > On 2017年06月07日 20:21, Douglas Harewood-Gill wrote:
> > > Hi there. That is fantastic. Sounds exactly like what I am looking
> for so thank you.
> > >
> > > One last question for the minute. I know you provided a link but
> how do you implement this with custom Ryu controller code?
> > >
> > > My apologies if I am asking something really obvious.
> > >
> > > Cheers
> > >
> > > Douglas
> > >
> > > On 7 June 2017 at 01:15, Fujimoto Satoshi <
> satoshi.fujimo...@gmail.com <mailto:satoshi.fujimo...@gmail.com> <mailto:
> satoshi.fujimo...@gmail.com <mailto:satoshi.fujimo...@gmail.com>>> wrote:
> > >
> > > Hi, Douglas
> > >
> > > Ryu has ofctl_rest.py, which is a sample application and
> provides REST API to get flow statistics.
> > > http://ryu.readthedocs.io/en/
> latest/app/ofctl_rest.html <http://ryu.readthedocs.io/en/
> latest/app/ofctl_rest.html> <http://ryu.readthedocs.io/en/
> latest/app/ofctl_rest.html <http://ryu.readthedocs.io/en/
> latest/app/ofctl_rest.html>>
> > >
> > > I think it is better to use ofctl_rest.py than to implement
> your own REST API in your app.
> > >
> > > Thanks,
> > > Fujimoto
> > >
> > >
> > > On 2017年06月06日 21:18, Douglas Harewood-Gill wrote:
> > >>
> > >> Greetings I am a PhD student new to both Python and Ryu and
> I was wondering if anyone could give me some advice.
> > >>
> > >>
> > >> I am using the Ryu controller program
> (L2DestForwardStaticRyu.py) provided by Dr Grey Bernstein (
> https://www.grotto-networking.com/SDNfun.html#
> programming-switches-with-ryu <https://www.grotto-
> networking.com/SDNfun.html#programming-switches-with-ryu> <
> https://www.grotto-networking.com/SDNfun.html#
> programming-switches-with-ryu <https://www.grotto-
> networking.com/SDNfun.html#programming-switches-with-ryu>>) for shortest
> path computation for a full Mesh network in Mininet but the example
> provided does not include REST which I require to be able to collect flow
> statistics such as the flows in each router, bandwidth, latency, etc.
> > >>
> > >>
> > >> Unfortunately I have been looking and with the exception of (
> https://osrg.github.io/ryu-book/en/html/rest_api.html <
> https://osrg.github.io/ryu-book/en/html/rest_api.html> <
> https://osrg.github.io/ryu-book/en/html/rest_api.html <
> https://osrg.github.io/ryu-book/en/html/rest_api.html>>) which seems
> overly specific, I am unable to find a good example that would allow me to
> work out how to integrate REST into the above Ryu control program.
> > >>
> > >> So if anyone can point me in the right direction or can
> provide some examples, I would be most grateful.
> > >>
> > >>
> > >> Thank you for your time.
> > >>
> > >>
> > >> Best Regards
> > >>
> > >>
> > >> Douglas
> > >>
> > >>
> > >>
> > >> --
> > >> *Douglas Harewood-Gill MSc MIET*
> > >> CDT Student in Communications (PhD), University of Bristol
> > >> Post-Graduate Student (Taught and Research)
> > >> e-mail: douglas.harewood-g...@bristol.ac.uk <mailto:
> douglas.harewood-g...@bristol.ac.uk> <mailto:douglas.harewood-gill@
> bristol.ac.uk <mailto:douglas.harewood-g...@bristol.ac.uk>>
> > >>
> > >> *
> > >> CDT Communications*
> > >>
> > >> University of Bristol, Merchant Venturers' Building, Woodland
> Road, Clifton, Bristol. BS8 1UB
> > >>
> > >> http://www.bristol.ac.uk/
> > >>
> > >>
> > >>
> > >>
> > >> ------------------------------------------------------------
> ------------------
> > >> Check out the vibrant tech community on one of the world's
> most
> > >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > >>
> > >>
> > >> _______________________________________________
> > >> Ryu-devel mailing list
> > >> Ryu-devel@lists.sourceforge.net <mailto:Ryu-devel@lists.
> sourceforge.net> <mailto:Ryu-devel@lists.sourceforge.net <mailto:
> Ryu-devel@lists.sourceforge.net>>
> > >> https://lists.sourceforge.net/lists/listinfo/ryu-devel <
> https://lists.sourceforge.net/lists/listinfo/ryu-devel> <
> https://lists.sourceforge.net/lists/listinfo/ryu-devel <
> https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
> > >
> > >
> > >
> > >
> > > --
> > > *Douglas Harewood-Gill MSc MIET*
> > > CDT Student in Communications (PhD), University of Bristol
> > > Post-Graduate Student (Taught and Research)
> > > e-mail: douglas.harewood-g...@bristol.ac.uk <mailto:
> douglas.harewood-g...@bristol.ac.uk> <mailto:douglas.harewood-gill@
> bristol.ac.uk <mailto:douglas.harewood-g...@bristol.ac.uk>>
> > >
> > > *
> > > CDT Communications*
> > >
> > > University of Bristol, Merchant Venturers' Building, Woodland
> Road, Clifton, Bristol. BS8 1UB
> > >
> > > http://www.bristol.ac.uk/
> > >
> > >
> > >
> > >
> > > ------------------------------------------------------------
> ------------------
> > > Check out the vibrant tech community on one of the world's most
> > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > >
> > >
> > >
> > > _______________________________________________
> > > Ryu-devel mailing list
> > > Ryu-devel@lists.sourceforge.net <mailto:Ryu-devel@lists.
> sourceforge.net>
> > > https://lists.sourceforge.net/lists/listinfo/ryu-devel <
> https://lists.sourceforge.net/lists/listinfo/ryu-devel>
> > >
> >
> >
> >
> >
> > --
> > *Douglas Harewood-Gill MSc MIET*
> > CDT Student in Communications (PhD), University of Bristol
> > Post-Graduate Student (Taught and Research)
> > e-mail: douglas.harewood-g...@bristol.ac.uk <mailto:
> douglas.harewood-g...@bristol.ac.uk>
> >
> > *
> > CDT Communications*
> >
> > University of Bristol, Merchant Venturers' Building, Woodland Road,
> Clifton, Bristol. BS8 1UB
> >
> > http://www.bristol.ac.uk/
> >
> >
> >
> >
> > ------------------------------------------------------------
> ------------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> >
> >
> >
> > _______________________________________________
> > Ryu-devel mailing list
> > Ryu-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/ryu-devel
> >
>
--
*Douglas Harewood-Gill MSc MIET*
CDT Student in Communications (PhD), University of Bristol
Post-Graduate Student (Taught and Research)
e-mail: douglas.harewood-g...@bristol.ac.uk
*CDT Communications*
University of Bristol, Merchant Venturers' Building, Woodland Road,
Clifton, Bristol. BS8 1UB
http://www.bristol.ac.uk/
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