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# Copyright (C) 2012 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.
import logging
import json
from webob import Response
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller import dpset
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_0
from ryu.lib import ofctl_v1_0
from ryu.app.wsgi import ControllerBase, WSGIApplication
LOG = logging.getLogger('ryu.app.ofctl_rest')
# REST API
#
## Retrieve the switch stats
#
# get the list of all switches
# GET /stats/switches
#
# get the desc stats of the switch
# GET /stats/desc/<dpid>
#
# get flows stats of the switch
# GET /stats/flow/<dpid>
#
# get ports stats of the switch
# GET /stats/port/<dpid>
#
## Update the switch stats
#
# add a flow entry
# POST /stats/flowentry/add
#
# modify all matching flow entries
# POST /stats/flowentry/modify
#
# delete all matching flow entries
# POST /stats/flowentry/delete
#
# delete all flow entries of the switch
# DELETE /stats/flowentry/clear/<dpid>
#
class StatsController(ControllerBase):
def __init__(self, req, link, data, **config):
super(StatsController, self).__init__(req, link, data, **config)
self.dpset = data['dpset']
self.waiters = data['waiters']
def get_dpids(self, req, **_kwargs):
dps = self.dpset.dps.keys()
body = json.dumps(dps)
return (Response(content_type='application/json', body=body))
def get_desc_stats(self, req, dpid, **_kwargs):
dp = self.dpset.get(int(dpid))
if dp is None:
return Response(status=404)
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
desc = ofctl_v1_0.get_desc_stats(dp, self.waiters)
else:
LOG.debug('Unsupported OF protocol')
return Response(status=501)
body = json.dumps(desc)
return (Response(content_type='application/json', body=body))
def get_flow_stats(self, req, dpid, **_kwargs):
dp = self.dpset.get(int(dpid))
if dp is None:
return Response(status=404)
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
flows = ofctl_v1_0.get_flow_stats(dp, self.waiters)
else:
LOG.debug('Unsupported OF protocol')
return Response(status=501)
body = json.dumps(flows)
return (Response(content_type='application/json', body=body))
def get_port_stats(self, req, dpid, **_kwargs):
dp = self.dpset.get(int(dpid))
if dp is None:
return Response(status=404)
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
ports = ofctl_v1_0.get_port_stats(dp, self.waiters)
else:
LOG.debug('Unsupported OF protocol')
return Response(status=501)
body = json.dumps(ports)
return (Response(content_type='application/json', body=body))
def mod_flow_entry(self, req, cmd, **_kwargs):
try:
flow = eval(req.body)
except SyntaxError:
LOG.debug('invalid syntax %s', req.body)
return Response(status=400)
dpid = flow.get('dpid')
dp = self.dpset.get(int(dpid))
if dp is None:
return Response(status=404)
if cmd == 'add':
cmd = dp.ofproto.OFPFC_ADD
elif cmd == 'modify':
cmd = dp.ofproto.OFPFC_MODIFY
elif cmd == 'delete':
cmd = dp.ofproto.OFPFC_DELETE
else:
return Response(status=404)
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
ofctl_v1_0.mod_flow_entry(dp, flow, cmd)
else:
LOG.debug('Unsupported OF protocol')
return Response(status=501)
return Response(status=200)
def delete_flow_entry(self, req, dpid, **_kwargs):
dp = self.dpset.get(int(dpid))
if dp is None:
return Response(status=404)
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
ofctl_v1_0.delete_flow_entry(dp)
else:
LOG.debug('Unsupported OF protocol')
return Response(status=501)
return Response(status=200)
class RestStatsApi(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
_CONTEXTS = {
'dpset': dpset.DPSet,
'wsgi': WSGIApplication
}
def __init__(self, *args, **kwargs):
super(RestStatsApi, self).__init__(*args, **kwargs)
self.dpset = kwargs['dpset']
wsgi = kwargs['wsgi']
self.waiters = {}
self.data = {}
self.data['dpset'] = self.dpset
self.data['waiters'] = self.waiters
mapper = wsgi.mapper
wsgi.registory['StatsController'] = self.data
path = '/stats'
uri = path + '/switches'
mapper.connect('stats', uri,
controller=StatsController, action='get_dpids',
conditions=dict(method=['GET']))
uri = path + '/desc/{dpid}'
mapper.connect('stats', uri,
controller=StatsController, action='get_desc_stats',
conditions=dict(method=['GET']))
uri = path + '/flow/{dpid}'
mapper.connect('stats', uri,
controller=StatsController, action='get_flow_stats',
conditions=dict(method=['GET']))
uri = path + '/port/{dpid}'
mapper.connect('stats', uri,
controller=StatsController, action='get_port_stats',
conditions=dict(method=['GET']))
uri = path + '/flowentry/{cmd}'
mapper.connect('stats', uri,
controller=StatsController, action='mod_flow_entry',
conditions=dict(method=['POST']))
uri = path + '/flowentry/clear/{dpid}'
mapper.connect('stats', uri,
controller=StatsController, action='delete_flow_entry',
conditions=dict(method=['DELETE']))
def stats_reply_handler(self, ev):
msg = ev.msg
dp = msg.datapath
if dp.id not in self.waiters:
return
if msg.xid not in self.waiters[dp.id]:
return
lock, msgs = self.waiters[dp.id][msg.xid]
msgs.append(msg)
if msg.flags & dp.ofproto.OFPSF_REPLY_MORE:
return
del self.waiters[dp.id][msg.xid]
lock.set()
@set_ev_cls(ofp_event.EventOFPDescStatsReply, MAIN_DISPATCHER)
def desc_stats_reply_handler(self, ev):
self.stats_reply_handler(ev)
@set_ev_cls(ofp_event.EventOFPFlowStatsReply, MAIN_DISPATCHER)
def flow_stats_reply_handler(self, ev):
self.stats_reply_handler(ev)
@set_ev_cls(ofp_event.EventOFPPortStatsReply, MAIN_DISPATCHER)
def port_stats_reply_handler(self, ev):
self.stats_reply_handler(ev)
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