forked from faucetsdn/ryu
-
Notifications
You must be signed in to change notification settings - Fork 176
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
7 changed files
with
432 additions
and
97 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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)) |
Oops, something went wrong.