| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * 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. |
| */ |
| package org.onosproject.provider.nil; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Maps; |
| import org.onosproject.net.ConnectPoint; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.Link; |
| import org.onosproject.net.device.DeviceProviderService; |
| import org.onosproject.net.device.DeviceService; |
| import org.onosproject.net.link.DefaultLinkDescription; |
| import org.onosproject.net.link.LinkDescription; |
| import org.onosproject.net.link.LinkProviderService; |
| import org.onosproject.net.link.LinkService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Random; |
| import java.util.Set; |
| import java.util.concurrent.ExecutorService; |
| import java.util.stream.Collectors; |
| |
| import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor; |
| import static org.onlab.util.Tools.delay; |
| import static org.onlab.util.Tools.groupedThreads; |
| import static org.onosproject.net.Link.Type.DIRECT; |
| import static org.onosproject.net.MastershipRole.MASTER; |
| import static org.onosproject.provider.nil.TopologySimulator.description; |
| |
| /** |
| * Drives topology mutations at a specified rate of events per second. |
| */ |
| class TopologyMutationDriver implements Runnable { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| private static final int WAIT_DELAY = 2_000; |
| private static final int MAX_DOWN_LINKS = 5; |
| |
| private final Random random = new Random(); |
| |
| private volatile boolean stopped = true; |
| |
| private double mutationRate; |
| private int millis, nanos; |
| |
| private LinkService linkService; |
| private DeviceService deviceService; |
| private LinkProviderService linkProviderService; |
| private DeviceProviderService deviceProviderService; |
| private TopologySimulator simulator; |
| |
| private List<LinkDescription> activeLinks; |
| private List<LinkDescription> inactiveLinks; |
| |
| private final ExecutorService executor = |
| newSingleThreadScheduledExecutor(groupedThreads("onos/null", "topo-mutator", log)); |
| |
| private Map<DeviceId, Set<Link>> savedLinks = Maps.newConcurrentMap(); |
| |
| /** |
| * Starts the mutation process. |
| * |
| * @param mutationRate link events per second |
| * @param linkService link service |
| * @param deviceService device service |
| * @param linkProviderService link provider service |
| * @param deviceProviderService device provider service |
| * @param simulator topology simulator |
| */ |
| void start(double mutationRate, |
| LinkService linkService, DeviceService deviceService, |
| LinkProviderService linkProviderService, |
| DeviceProviderService deviceProviderService, |
| TopologySimulator simulator) { |
| savedLinks.clear(); |
| stopped = false; |
| this.linkService = linkService; |
| this.deviceService = deviceService; |
| this.linkProviderService = linkProviderService; |
| this.deviceProviderService = deviceProviderService; |
| this.simulator = simulator; |
| activeLinks = reduceLinks(); |
| inactiveLinks = Lists.newArrayList(); |
| adjustRate(mutationRate); |
| executor.execute(this); |
| } |
| |
| /** |
| * Adjusts the topology mutation rate. |
| * |
| * @param mutationRate new topology mutation rate |
| */ |
| void adjustRate(double mutationRate) { |
| this.mutationRate = mutationRate; |
| if (mutationRate > 0) { |
| this.millis = (int) (1_000 / mutationRate / 2); |
| this.nanos = (int) (1_000_000 / mutationRate / 2) % 1_000_000; |
| } else { |
| this.millis = 0; |
| this.nanos = 0; |
| } |
| log.info("Settings: millis={}, nanos={}", millis, nanos); |
| } |
| |
| /** |
| * Stops the mutation process. |
| */ |
| void stop() { |
| stopped = true; |
| } |
| |
| /** |
| * Severs the link between the specified end-points in both directions. |
| * |
| * @param one link endpoint |
| * @param two link endpoint |
| */ |
| void severLink(ConnectPoint one, ConnectPoint two) { |
| LinkDescription link = new DefaultLinkDescription(one, two, DIRECT); |
| linkProviderService.linkVanished(link); |
| linkProviderService.linkVanished(reverse(link)); |
| |
| } |
| |
| /** |
| * Repairs the link between the specified end-points in both directions. |
| * |
| * @param one link endpoint |
| * @param two link endpoint |
| */ |
| void repairLink(ConnectPoint one, ConnectPoint two) { |
| LinkDescription link = new DefaultLinkDescription(one, two, DIRECT); |
| linkProviderService.linkDetected(link); |
| linkProviderService.linkDetected(reverse(link)); |
| } |
| |
| /** |
| * Fails the specified device. |
| * |
| * @param deviceId device identifier |
| */ |
| void failDevice(DeviceId deviceId) { |
| savedLinks.put(deviceId, linkService.getDeviceLinks(deviceId)); |
| deviceProviderService.deviceDisconnected(deviceId); |
| } |
| |
| /** |
| * Repairs the specified device. |
| * |
| * @param deviceId device identifier |
| */ |
| void repairDevice(DeviceId deviceId) { |
| int chassisId = Integer.parseInt(deviceId.uri().getSchemeSpecificPart()); |
| simulator.createDevice(deviceId, chassisId); |
| Set<Link> links = savedLinks.remove(deviceId); |
| if (links != null) { |
| links.forEach(l -> linkProviderService |
| .linkDetected(new DefaultLinkDescription(l.src(), l.dst(), DIRECT))); |
| } |
| } |
| |
| /** |
| * Returns whether the given device is considered reachable or not. |
| * |
| * @param deviceId device identifier |
| * @return true if device is reachable |
| */ |
| boolean isReachable(DeviceId deviceId) { |
| return !savedLinks.containsKey(deviceId); |
| } |
| |
| @Override |
| public void run() { |
| delay(WAIT_DELAY); |
| |
| while (!stopped) { |
| if (mutationRate > 0 && inactiveLinks.isEmpty()) { |
| primeInactiveLinks(); |
| } else if (mutationRate <= 0 && !inactiveLinks.isEmpty()) { |
| repairInactiveLinks(); |
| } else if (inactiveLinks.isEmpty()) { |
| delay(WAIT_DELAY); |
| |
| } else { |
| activeLinks.add(repairLink()); |
| pause(); |
| inactiveLinks.add(severLink()); |
| pause(); |
| } |
| } |
| } |
| |
| // Primes the inactive links with a few random links. |
| private void primeInactiveLinks() { |
| for (int i = 0, n = Math.min(MAX_DOWN_LINKS, activeLinks.size()); i < n; i++) { |
| inactiveLinks.add(severLink()); |
| } |
| } |
| |
| // Repairs all inactive links. |
| private void repairInactiveLinks() { |
| while (!inactiveLinks.isEmpty()) { |
| repairLink(); |
| } |
| } |
| |
| // Picks a random active link and severs it. |
| private LinkDescription severLink() { |
| LinkDescription link = getRandomLink(activeLinks); |
| linkProviderService.linkVanished(link); |
| linkProviderService.linkVanished(reverse(link)); |
| return link; |
| } |
| |
| // Picks a random inactive link and repairs it. |
| private LinkDescription repairLink() { |
| LinkDescription link = getRandomLink(inactiveLinks); |
| linkProviderService.linkDetected(link); |
| linkProviderService.linkDetected(reverse(link)); |
| return link; |
| } |
| |
| // Produces a reverse of the specified link. |
| private LinkDescription reverse(LinkDescription link) { |
| return new DefaultLinkDescription(link.dst(), link.src(), link.type()); |
| } |
| |
| // Returns a random link from the specified list of links. |
| private LinkDescription getRandomLink(List<LinkDescription> links) { |
| return links.remove(random.nextInt(links.size())); |
| } |
| |
| // Reduces the given list of links to just a single link in each original pair. |
| private List<LinkDescription> reduceLinks() { |
| List<LinkDescription> links = Lists.newArrayList(); |
| linkService.getLinks().forEach(link -> links.add(description(link))); |
| return links.stream() |
| .filter(this::isOurLink) |
| .filter(this::isRightDirection) |
| .collect(Collectors.toList()); |
| } |
| |
| // Returns true if the specified link is ours. |
| private boolean isOurLink(LinkDescription linkDescription) { |
| return deviceService.getRole(linkDescription.src().deviceId()) == MASTER; |
| } |
| |
| // Returns true if the link source is greater than the link destination. |
| private boolean isRightDirection(LinkDescription link) { |
| return link.src().deviceId().toString().compareTo(link.dst().deviceId().toString()) > 0; |
| } |
| |
| // Pauses the current thread for the pre-computed time of millis & nanos. |
| private void pause() { |
| delay(millis, nanos); |
| } |
| |
| } |