[ONOS-2607] Implement BGP LS topology provider and listen on Node and Link changes of BGP Controller.
Change-Id: I811ca8d078ab5825819cef81fd8096d842f76c44
diff --git a/providers/bgp/topology/src/main/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProvider.java b/providers/bgp/topology/src/main/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProvider.java
new file mode 100755
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--- /dev/null
+++ b/providers/bgp/topology/src/main/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProvider.java
@@ -0,0 +1,230 @@
+/*
+ * 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.bgp.topology.impl;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.bgp.controller.BgpDpid.uri;
+import static org.onosproject.net.DeviceId.deviceId;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+import org.onlab.packet.ChassisId;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.bgp.controller.BGPController;
+import org.onosproject.bgp.controller.BgpDpid;
+import org.onosproject.bgp.controller.BgpLinkListener;
+import org.onosproject.bgp.controller.BgpNodeListener;
+import org.onosproject.bgpio.protocol.linkstate.BgpLinkLsNlriVer4;
+import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.net.device.DefaultDeviceDescription;
+import org.onosproject.net.device.DefaultPortDescription;
+import org.onosproject.net.device.DeviceDescription;
+import org.onosproject.net.device.DeviceProvider;
+import org.onosproject.net.device.DeviceProviderRegistry;
+import org.onosproject.net.device.DeviceProviderService;
+import org.onosproject.net.device.PortDescription;
+import org.onosproject.net.link.DefaultLinkDescription;
+import org.onosproject.net.link.LinkDescription;
+import org.onosproject.net.link.LinkProvider;
+import org.onosproject.net.link.LinkProviderRegistry;
+import org.onosproject.net.link.LinkProviderService;
+import org.onosproject.net.provider.AbstractProvider;
+import org.onosproject.net.provider.ProviderId;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Provider which uses an BGP controller to detect network infrastructure topology.
+ */
+@Component(immediate = true)
+public class BgpTopologyProvider extends AbstractProvider implements LinkProvider, DeviceProvider {
+
+ public BgpTopologyProvider() {
+ super(new ProviderId("bgp", "org.onosproject.provider.bgp"));
+ }
+
+ private static final Logger log = LoggerFactory.getLogger(BgpTopologyProvider.class);
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected LinkProviderRegistry linkProviderRegistry;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected DeviceProviderRegistry deviceProviderRegistry;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected BGPController controller;
+
+ private DeviceProviderService deviceProviderService;
+ private LinkProviderService linkProviderService;
+
+ private HashMap<String, List<PortDescription>> portMap = new HashMap<>();
+ private InternalBgpProvider listener = new InternalBgpProvider();
+ private static final String UNKNOWN = "unknown";
+
+ @Activate
+ public void activate() {
+ linkProviderService = linkProviderRegistry.register(this);
+ deviceProviderService = deviceProviderRegistry.register(this);
+ controller.addListener(listener);
+ controller.addLinkListener(listener);
+ }
+
+ @Deactivate
+ public void deactivate() {
+ linkProviderRegistry.unregister(this);
+ linkProviderService = null;
+ controller.removeListener(listener);
+ controller.removeLinkListener(listener);
+ }
+
+ private List<PortDescription> buildPortDescriptions(String linkUri) {
+
+ List<PortDescription> portList;
+
+ if (portMap.containsKey(linkUri)) {
+ portList = portMap.get(linkUri);
+ } else {
+ portList = new ArrayList<>();
+ }
+
+ // TODO: port description
+ portList.add(new DefaultPortDescription(null, true));
+
+ portMap.put(linkUri, portList);
+ return portList;
+ }
+
+ /**
+ * Build a link description from a bgp link.
+ *
+ * @param bgpLink bgp link
+ * @return linkDescription link description
+ */
+ private LinkDescription buildLinkDescription(BgpLinkLsNlriVer4 bgpLink) {
+ LinkDescription ld = null;
+ checkNotNull(bgpLink);
+
+ BgpDpid localNodeUri = new BgpDpid(bgpLink, BgpDpid.NODE_DESCRIPTOR_LOCAL);
+ DeviceId srcDeviceID = deviceId(uri(localNodeUri.toString()));
+
+ BgpDpid remoteNodeUri = new BgpDpid(bgpLink, BgpDpid.NODE_DESCRIPTOR_REMOTE);
+ DeviceId dstDeviceID = deviceId(uri(remoteNodeUri.toString()));
+
+ deviceProviderService.updatePorts(srcDeviceID, buildPortDescriptions(localNodeUri.toString()));
+
+ deviceProviderService.updatePorts(dstDeviceID, buildPortDescriptions(remoteNodeUri.toString()));
+
+ ConnectPoint src = new ConnectPoint(srcDeviceID, null);
+
+ ConnectPoint dst = new ConnectPoint(dstDeviceID, null);
+
+ ld = new DefaultLinkDescription(src, dst, Link.Type.INDIRECT);
+ return ld;
+ }
+
+ /*
+ * Implements device and link update.
+ */
+ private class InternalBgpProvider implements BgpNodeListener, BgpLinkListener {
+
+ @Override
+ public void addNode(BGPNodeLSNlriVer4 nodeNlri) {
+ log.debug("Add node {}", nodeNlri.toString());
+
+ if (deviceProviderService == null) {
+ return;
+ }
+ BgpDpid nodeUri = new BgpDpid(nodeNlri);
+ DeviceId deviceId = deviceId(uri(nodeUri.toString()));
+ ChassisId cId = new ChassisId();
+
+ DeviceDescription description = new DefaultDeviceDescription(uri(nodeUri.toString()), Device.Type.ROUTER,
+ UNKNOWN, UNKNOWN, UNKNOWN, UNKNOWN, cId);
+ deviceProviderService.deviceConnected(deviceId, description);
+
+ }
+
+ @Override
+ public void deleteNode(BGPNodeLSNlriVer4 nodeNlri) {
+ log.debug("Delete node {}", nodeNlri.toString());
+
+ if (deviceProviderService == null) {
+ return;
+ }
+
+ BgpDpid nodeUri = new BgpDpid(nodeNlri);
+ deviceProviderService.deviceDisconnected(deviceId(uri(nodeUri.toString())));
+ }
+
+ @Override
+ public void addLink(BgpLinkLsNlriVer4 linkNlri) {
+ log.debug("Add link {}", linkNlri.toString());
+
+ if (linkProviderService == null) {
+ return;
+ }
+
+ LinkDescription ld = buildLinkDescription(linkNlri);
+ if (ld == null) {
+ log.error("Invalid link info.");
+ return;
+ }
+
+ linkProviderService.linkDetected(ld);
+ }
+
+ @Override
+ public void deleteLink(BgpLinkLsNlriVer4 linkNlri) {
+ log.debug("Delete link {}", linkNlri.toString());
+
+ if (linkProviderService == null) {
+ return;
+ }
+
+ LinkDescription ld = buildLinkDescription(linkNlri);
+ if (ld == null) {
+ log.error("Invalid link info.");
+ return;
+ }
+
+ linkProviderService.linkVanished(ld);
+ }
+ }
+
+ @Override
+ public void triggerProbe(DeviceId deviceId) {
+ // TODO Auto-generated method stub
+ }
+
+ @Override
+ public void roleChanged(DeviceId deviceId, MastershipRole newRole) {
+ }
+
+ @Override
+ public boolean isReachable(DeviceId deviceId) {
+ // TODO Auto-generated method stub
+ return true;
+ }
+}