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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| # Copyright (C) 2016 Li Cheng at Beijing University of Posts | ||
| # and Telecommunications. www.muzixing.com | ||
| # | ||
| # 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. | ||
|
|
||
| from __future__ import division | ||
| from ryu import cfg | ||
| from ryu.base import app_manager | ||
| from ryu.base.app_manager import lookup_service_brick | ||
| from ryu.controller import ofp_event | ||
| from ryu.controller.handler import MAIN_DISPATCHER, DEAD_DISPATCHER | ||
| from ryu.controller.handler import set_ev_cls | ||
| from ryu.ofproto import ofproto_v1_3 | ||
| from ryu.lib import hub | ||
| from ryu.topology.switches import Switches | ||
| from ryu.topology.switches import LLDPPacket | ||
| import networkx as nx | ||
| import time | ||
| import setting | ||
|
|
||
|
|
||
| CONF = cfg.CONF | ||
|
|
||
|
|
||
| class NetworkDelayDetector(app_manager.RyuApp): | ||
| OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION] | ||
|
|
||
| def __init__(self, *args, **kwargs): | ||
| super(NetworkDelayDetector, self).__init__(*args, **kwargs) | ||
| self.name = 'delaydetector' | ||
| self.sw_module = lookup_service_brick('switches') | ||
| self.awareness = lookup_service_brick('awareness') | ||
|
|
||
| self.datapaths = {} | ||
| self.echo_latency = {} | ||
| self.measure_thread = hub.spawn(self._detector) | ||
|
|
||
| @set_ev_cls(ofp_event.EventOFPStateChange, | ||
| [MAIN_DISPATCHER, DEAD_DISPATCHER]) | ||
| def _state_change_handler(self, ev): | ||
| datapath = ev.datapath | ||
| if ev.state == MAIN_DISPATCHER: | ||
| if not datapath.id in self.datapaths: | ||
| self.logger.debug('Register datapath: %016x', datapath.id) | ||
| self.datapaths[datapath.id] = datapath | ||
| elif ev.state == DEAD_DISPATCHER: | ||
| if datapath.id in self.datapaths: | ||
| self.logger.debug('Unregister datapath: %016x', datapath.id) | ||
| del self.datapaths[datapath.id] | ||
|
|
||
| def _detector(self): | ||
| while CONF.weight == 'delay': | ||
| self.create_link_delay() | ||
| try: | ||
| self.awareness.shortest_paths = {} | ||
| self.logger.debug("Refresh the shortest_paths") | ||
| except: | ||
| self.awareness = lookup_service_brick('awareness') | ||
|
|
||
| self.show_delay_statis() | ||
| self._send_echo_request() | ||
| hub.sleep(setting.DELAY_DETECTING_PERIOD) | ||
|
|
||
| def _send_echo_request(self): | ||
| for datapath in self.datapaths.values(): | ||
| parser = datapath.ofproto_parser | ||
| data = "%.6f" % time.time() | ||
| echo_req = parser.OFPEchoRequest(datapath, data=data) | ||
| datapath.send_msg(echo_req) | ||
|
|
||
| @set_ev_cls(ofp_event.EventOFPEchoReply, MAIN_DISPATCHER) | ||
| def echo_reply_handler(self, ev): | ||
| try: | ||
| latency = time.time() - eval(ev.msg.data) | ||
| self.echo_latency[ev.msg.datapath.id] = latency | ||
| except: | ||
| return | ||
|
|
||
| def get_dalay(self, src, dst): | ||
| try: | ||
| fwd_delay = self.awareness.graph[src][dst]['lldpdelay'] | ||
| re_delay = self.awareness.graph[dst][src]['lldpdelay'] | ||
| src_latency = self.echo_latency[src] | ||
| dst_latency = self.echo_latency[dst] | ||
|
|
||
| delay = (fwd_delay + re_delay - src_latency - dst_latency)/2 | ||
| return max(delay, 0) | ||
| except: | ||
| return float('inf') | ||
|
|
||
| def _save_lldp_delay(self, src=0, dst=0, lldpdelay=0): | ||
| try: | ||
| self.awareness.graph[src][dst]['lldpdelay'] = lldpdelay | ||
| except: | ||
| if self.awareness is None: | ||
| self.awareness = lookup_service_brick('awareness') | ||
| return | ||
|
|
||
| def create_link_delay(self): | ||
| try: | ||
| for src in self.awareness.graph: | ||
| for dst in self.awareness.graph[src]: | ||
| if src == dst: | ||
| self.awareness.graph[src][dst]['delay'] = 0 | ||
| continue | ||
| delay = self.get_dalay(src, dst) | ||
| self.awareness.graph[src][dst]['delay'] = delay | ||
| except: | ||
| if self.awareness is None: | ||
| self.awareness = lookup_service_brick('awareness') | ||
| return | ||
|
|
||
| @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER) | ||
| def packet_in_handler(self, ev): | ||
| msg = ev.msg | ||
| try: | ||
| src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data) | ||
| dpid = msg.datapath.id | ||
| in_port = msg.match['in_port'] | ||
| if self.sw_module is None: | ||
| self.sw_module = lookup_service_brick('switches') | ||
|
|
||
| for port in self.sw_module.ports.keys(): | ||
| if src_dpid == port.dpid and src_port_no == port.port_no: | ||
| port_data = self.sw_module.ports[port] | ||
| timestamp = port_data.timestamp | ||
| if timestamp: | ||
| delay = time.time() - timestamp | ||
| self._save_lldp_delay(src=src_dpid, dst=dpid, | ||
| lldpdelay=delay) | ||
| except LLDPPacket.LLDPUnknownFormat as e: | ||
| return | ||
|
|
||
| def show_delay_statis(self): | ||
| if setting.TOSHOW and self.awareness is not None: | ||
| self.logger.info("\nsrc dst delay") | ||
| self.logger.info("---------------------------") | ||
| for src in self.awareness.graph: | ||
| for dst in self.awareness.graph[src]: | ||
| delay = self.awareness.graph[src][dst]['delay'] | ||
| self.logger.info("%s<-->%s : %s" % (src, dst, delay)) |
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