Pier Luigi | 83f919b | 2018-02-15 16:33:08 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.segmentrouting; |
| 18 | |
| 19 | import com.google.common.collect.Maps; |
| 20 | import org.onosproject.event.Event; |
| 21 | import org.onosproject.net.Device; |
| 22 | import org.onosproject.net.DeviceId; |
| 23 | import org.onosproject.net.Link; |
| 24 | import org.onosproject.net.device.DeviceEvent; |
| 25 | import org.onosproject.net.link.LinkEvent; |
| 26 | import org.slf4j.Logger; |
| 27 | import org.slf4j.LoggerFactory; |
| 28 | |
| 29 | import java.util.List; |
| 30 | import java.util.Map; |
| 31 | import java.util.stream.Collectors; |
| 32 | |
| 33 | /** |
| 34 | * Handler for topology events. |
| 35 | */ |
| 36 | class TopologyHandler { |
| 37 | |
| 38 | // Logging instance |
| 39 | private static final Logger log = LoggerFactory.getLogger(TopologyHandler.class); |
| 40 | // Internal reference for SR manager and its services |
| 41 | private final SegmentRoutingManager srManager; |
| 42 | |
| 43 | /** |
| 44 | * Constructs the TopologyHandler. |
| 45 | * |
| 46 | * @param srManager Segment Routing manager |
| 47 | */ |
| 48 | TopologyHandler(SegmentRoutingManager srManager) { |
| 49 | this.srManager = srManager; |
| 50 | } |
| 51 | |
| 52 | // Check if the link event is valid |
| 53 | private boolean isValid(LinkEvent linkEvent) { |
| 54 | Link link = linkEvent.subject(); |
| 55 | // Verify if the link is valid with the link handler |
| 56 | if (!srManager.linkHandler.isLinkValid(link)) { |
| 57 | log.debug("Link {} ignored by the LinkHandler", link); |
| 58 | return false; |
| 59 | } |
| 60 | // Processing for LINK_REMOVED |
| 61 | if (linkEvent.type() == LinkEvent.Type.LINK_REMOVED) { |
| 62 | // device availability check helps to ensure that multiple link-removed |
| 63 | // events are actually treated as a single switch removed event. |
| 64 | // purgeSeenLink is necessary so we do rerouting (instead of rehashing) |
| 65 | // when switch comes back. |
| 66 | if (link.src().elementId() instanceof DeviceId |
| 67 | && !srManager.deviceService.isAvailable(link.src().deviceId())) { |
| 68 | log.debug("Link {} ignored device {} is down", link, link.src().deviceId()); |
| 69 | return false; |
| 70 | } |
| 71 | if (link.dst().elementId() instanceof DeviceId |
| 72 | && !srManager.deviceService.isAvailable(link.dst().deviceId())) { |
| 73 | log.debug("Link {} ignored device {} is down", link, link.dst().deviceId()); |
| 74 | return false; |
| 75 | } |
| 76 | // LINK_REMOVED is ok |
| 77 | return true; |
| 78 | } |
| 79 | // Processing for LINK_ADDED and LINK_UPDATED |
| 80 | // Verify if source device is configured |
| 81 | if (srManager.deviceConfiguration == null || |
| 82 | !srManager.deviceConfiguration.isConfigured(link.src().deviceId())) { |
| 83 | // Source device is not configured, not valid for us |
| 84 | log.warn("Source device of this link is not configured.. " |
| 85 | + "not processing further"); |
| 86 | return false; |
| 87 | } |
| 88 | // LINK_ADDED/LINK_UPDATED is ok |
| 89 | return true; |
| 90 | } |
| 91 | |
| 92 | // Check if the device event is valid |
| 93 | private boolean isValid(DeviceEvent deviceEvent) { |
| 94 | Device device = deviceEvent.subject(); |
| 95 | // We don't process the event if the device is available |
| 96 | return !srManager.deviceService.isAvailable(device.id()); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Process the TOPOLOGY_CHANGE event. An initial optimization |
| 101 | * is performed to avoid the processing of not relevant events. |
| 102 | * |
| 103 | * @param reasons list of events that triggered topology change |
| 104 | */ |
| 105 | void processTopologyChange(List<Event> reasons) { |
| 106 | // Store temporary in the map all the link events, |
| 107 | // events having the same subject will be automatically |
| 108 | // overridden. |
| 109 | Map<Link, LinkEvent> linkEvents = Maps.newHashMap(); |
| 110 | // Store temporary in the map all the device events, |
| 111 | // events having the same subject will be automatically |
| 112 | // overridden. |
| 113 | Map<DeviceId, DeviceEvent> deviceEvents = Maps.newHashMap(); |
| 114 | // Pre-process all the events putting them in the right map |
| 115 | reasons.forEach(reason -> { |
| 116 | // Relevant events for devices |
| 117 | if (reason.type() == DeviceEvent.Type.DEVICE_ADDED || |
| 118 | reason.type() == DeviceEvent.Type.DEVICE_AVAILABILITY_CHANGED || |
| 119 | reason.type() == DeviceEvent.Type.DEVICE_UPDATED) { |
| 120 | // Take the event and save in the map |
| 121 | DeviceEvent deviceEvent = (DeviceEvent) reason; |
| 122 | deviceEvents.put(deviceEvent.subject().id(), deviceEvent); |
| 123 | /// Relevant events for links |
| 124 | } else if (reason.type() == LinkEvent.Type.LINK_ADDED || |
| 125 | reason.type() == LinkEvent.Type.LINK_UPDATED || |
| 126 | reason.type() == LinkEvent.Type.LINK_REMOVED) { |
| 127 | // Take the event and store the link in the map |
| 128 | LinkEvent linkEvent = (LinkEvent) reason; |
| 129 | linkEvents.put(linkEvent.subject(), linkEvent); |
| 130 | // Other events are not relevant |
| 131 | } else { |
| 132 | log.debug("Unhandled event type: {}", reason.type()); |
| 133 | } |
| 134 | }); |
| 135 | // Verify if the link events are valid |
| 136 | // before sent for mcast handling |
| 137 | List<LinkEvent> toProcessLinkEvent = linkEvents.values() |
| 138 | .stream() |
| 139 | .filter(this::isValid) |
| 140 | .collect(Collectors.toList()); |
| 141 | // Verify if the device events are valid |
| 142 | // before sent for mcast handling |
| 143 | List<DeviceEvent> toProcessDeviceEvent = deviceEvents.values() |
| 144 | .stream() |
| 145 | .filter(this::isValid) |
| 146 | .collect(Collectors.toList()); |
| 147 | |
| 148 | // Processing part of the received events |
| 149 | // We don't need to process all LINK_ADDED |
| 150 | boolean isLinkAdded = false; |
| 151 | // Iterate on link events |
| 152 | for (LinkEvent linkEvent : toProcessLinkEvent) { |
| 153 | // We process just the first one |
| 154 | if (linkEvent.type() == LinkEvent.Type.LINK_ADDED || |
| 155 | linkEvent.type() == LinkEvent.Type.LINK_UPDATED) { |
| 156 | // Other ones are skipped |
| 157 | if (isLinkAdded) { |
| 158 | continue; |
| 159 | } |
| 160 | log.info("Processing - Event: {}", linkEvent); |
| 161 | // First time, let's process it |
| 162 | isLinkAdded = true; |
| 163 | // McastHandler, reroute all the mcast tree |
| 164 | srManager.mcastHandler.init(); |
| 165 | } else { |
| 166 | log.info("Processing - Event: {}", linkEvent); |
| 167 | // We compute each time a LINK_DOWN event |
| 168 | srManager.mcastHandler.processLinkDown(linkEvent.subject()); |
| 169 | } |
| 170 | } |
| 171 | // Process all the device events |
| 172 | toProcessDeviceEvent.forEach(deviceEvent -> { |
| 173 | log.info("Processing - Event: {}", deviceEvent); |
| 174 | srManager.mcastHandler.processDeviceDown(deviceEvent.subject().id()); |
| 175 | }); |
| 176 | } |
| 177 | } |