2 * Copyright (c) 2017 HPE and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.netvirt.elan.utils;
10 import com.google.common.base.Optional;
11 import com.google.common.collect.MapDifference;
12 import com.google.common.collect.MapDifference.ValueDifference;
13 import com.google.common.collect.Maps;
14 import java.math.BigInteger;
15 import java.util.ArrayList;
16 import java.util.Collections;
17 import java.util.HashSet;
18 import java.util.List;
20 import java.util.Map.Entry;
22 import java.util.stream.Collectors;
23 import javax.annotation.Nonnull;
24 import javax.inject.Inject;
25 import javax.inject.Singleton;
26 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
27 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
28 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
29 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
30 import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
31 import org.opendaylight.genius.datastoreutils.SingleTransactionDataBroker;
32 import org.opendaylight.genius.interfacemanager.interfaces.IInterfaceManager;
33 import org.opendaylight.netvirt.elan.internal.ElanBridgeManager;
34 import org.opendaylight.netvirt.elanmanager.api.IElanService;
35 import org.opendaylight.ovsdb.utils.mdsal.utils.MdsalUtils;
36 import org.opendaylight.ovsdb.utils.southbound.utils.SouthboundUtils;
37 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
38 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.BridgeRefInfo;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntry;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntryKey;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.rev160406.TunnelTypeVxlan;
43 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.DpnEndpoints;
44 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.DPNTEPsInfo;
45 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.DPNTEPsInfoKey;
46 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.dpn.teps.info.TunnelEndPoints;
47 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.dpn.endpoints.dpn.teps.info.tunnel.end.points.TzMembership;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.TransportZones;
49 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZone;
50 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZoneBuilder;
51 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.TransportZoneKey;
52 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.Subnets;
53 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.SubnetsBuilder;
54 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.SubnetsKey;
55 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.Vteps;
56 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.VtepsBuilder;
57 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.transport.zones.transport.zone.subnets.VtepsKey;
58 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.config.rev150710.ElanConfig;
59 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.interfaces.ElanInterface;
60 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.vpn.instance.op.data.entry.vpn.to.dpn.list.VpnInterfaces;
61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAugmentation;
62 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
63 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
64 import org.slf4j.Logger;
65 import org.slf4j.LoggerFactory;
68 public class TransportZoneNotificationUtil {
69 private static final Logger LOG = LoggerFactory.getLogger(TransportZoneNotificationUtil.class);
70 private static final String TUNNEL_PORT = "tunnel_port";
71 private static final String LOCAL_IP = "local_ip";
72 private static final String LOCAL_IPS = "local_ips";
73 private static final char IP_NETWORK_ZONE_NAME_DELIMITER = '-';
74 private static final String ALL_SUBNETS_GW = "0.0.0.0";
75 private static final String ALL_SUBNETS = "0.0.0.0/0";
76 private final DataBroker dataBroker;
77 private final MdsalUtils mdsalUtils;
78 private final SouthboundUtils southBoundUtils;
79 private final IElanService elanService;
80 private final ElanConfig elanConfig;
81 private final ElanBridgeManager elanBridgeManager;
84 public TransportZoneNotificationUtil(final DataBroker dbx, final IInterfaceManager interfaceManager,
85 final IElanService elanService, final ElanConfig elanConfig, final ElanBridgeManager elanBridgeManager) {
86 this.dataBroker = dbx;
87 this.mdsalUtils = new MdsalUtils(dbx);
88 this.elanService = elanService;
89 this.elanConfig = elanConfig;
90 this.elanBridgeManager = elanBridgeManager;
91 southBoundUtils = new SouthboundUtils(mdsalUtils);
94 public boolean shouldCreateVtep(List<VpnInterfaces> vpnInterfaces) {
95 if (vpnInterfaces == null || vpnInterfaces.isEmpty()) {
99 for (VpnInterfaces vpnInterface : vpnInterfaces) {
100 String interfaceName = vpnInterface.getInterfaceName();
102 ElanInterface elanInt = elanService.getElanInterfaceByElanInterfaceName(interfaceName);
103 if (elanInt == null) {
107 if (ElanUtils.isVxlanNetwork(dataBroker, elanInt.getElanInstanceName())) {
110 LOG.debug("Non-VXLAN elanInstance: " + elanInt.getElanInstanceName());
117 private TransportZone createZone(String subnetIp, String zoneName) {
118 List<Subnets> subnets = new ArrayList<>();
119 subnets.add(buildSubnets(subnetIp));
120 TransportZoneBuilder tzb = new TransportZoneBuilder().setKey(new TransportZoneKey(zoneName))
121 .setTunnelType(TunnelTypeVxlan.class).setZoneName(zoneName).setSubnets(subnets);
125 private void updateTransportZone(TransportZone zone, BigInteger dpnId, WriteTransaction tx)
126 throws TransactionCommitFailedException {
127 InstanceIdentifier<TransportZone> path = InstanceIdentifier.builder(TransportZones.class)
128 .child(TransportZone.class, new TransportZoneKey(zone.getZoneName())).build();
131 SingleTransactionDataBroker.syncUpdate(dataBroker, LogicalDatastoreType.CONFIGURATION, path, zone);
133 tx.merge(LogicalDatastoreType.CONFIGURATION, path, zone);
135 LOG.info("Transport zone {} updated due to dpn {} handling.", zone.getZoneName(), dpnId);
138 public void updateTransportZone(String zoneNamePrefix, BigInteger dpnId) {
139 Map<String, String> localIps = getDpnLocalIps(dpnId);
140 if (localIps != null && !localIps.isEmpty()) {
141 LOG.debug("Will use local_ips for transport zone update for dpn {} and zone name prefix {}", dpnId,
143 for (Entry<String, String> entry : localIps.entrySet()) {
144 String localIp = entry.getKey();
145 String underlayNetworkName = entry.getValue();
146 String zoneName = getTzNameForUnderlayNetwork(zoneNamePrefix, underlayNetworkName);
147 updateTransportZone(zoneName, dpnId, localIp);
150 updateTransportZone(zoneNamePrefix, dpnId, getDpnLocalIp(dpnId));
154 private void updateTransportZone(String zoneName, BigInteger dpnId, String localIp) {
155 updateTransportZone(zoneName, dpnId, localIp, null);
158 @SuppressWarnings("checkstyle:IllegalCatch")
159 private void updateTransportZone(String zoneName, BigInteger dpnId, String localIp, WriteTransaction tx) {
160 InstanceIdentifier<TransportZone> inst = InstanceIdentifier.create(TransportZones.class)
161 .child(TransportZone.class, new TransportZoneKey(zoneName));
163 // FIXME: Read this through a cache
164 TransportZone zone = mdsalUtils.read(LogicalDatastoreType.CONFIGURATION, inst);
167 zone = createZone(ALL_SUBNETS, zoneName);
171 if (addVtep(zone, ALL_SUBNETS, dpnId, localIp)) {
172 updateTransportZone(zone, dpnId, tx);
174 } catch (Exception e) {
175 LOG.error("Failed to add tunnels for dpn {} in zone {}", dpnId, zoneName, e);
179 private void deleteTransportZone(TransportZone zone, BigInteger dpnId, WriteTransaction tx)
180 throws TransactionCommitFailedException {
181 InstanceIdentifier<TransportZone> path = InstanceIdentifier.builder(TransportZones.class)
182 .child(TransportZone.class, new TransportZoneKey(zone.getZoneName())).build();
185 SingleTransactionDataBroker.syncDelete(dataBroker, LogicalDatastoreType.CONFIGURATION, path);
187 tx.delete(LogicalDatastoreType.CONFIGURATION, path);
189 LOG.info("Transport zone {} deleted due to dpn {} handling.", zone.getZoneName(), dpnId);
192 public void deleteTransportZone(String zoneNamePrefix, BigInteger dpnId) {
193 Map<String, String> localIps = getDpnLocalIps(dpnId);
194 if (localIps != null && !localIps.isEmpty()) {
195 LOG.debug("Will use local_ips for transport zone delete for dpn {} and zone name prefix {}", dpnId,
197 for (Entry<String, String> entry : localIps.entrySet()) {
198 String localIp = entry.getKey();
199 String underlayNetworkName = entry.getValue();
200 String zoneName = getTzNameForUnderlayNetwork(zoneNamePrefix, underlayNetworkName);
201 deleteTransportZone(zoneName, dpnId, localIp);
204 deleteTransportZone(zoneNamePrefix, dpnId, getDpnLocalIp(dpnId));
208 private void deleteTransportZone(String zoneName, BigInteger dpnId, String localIp) {
209 deleteTransportZone(zoneName, dpnId, localIp, null);
212 @SuppressWarnings("checkstyle:IllegalCatch")
213 private void deleteTransportZone(String zoneName, BigInteger dpnId, String localIp, WriteTransaction tx) {
214 InstanceIdentifier<TransportZone> inst = InstanceIdentifier.create(TransportZones.class)
215 .child(TransportZone.class, new TransportZoneKey(zoneName));
217 // FIXME: Read this through a cache
218 TransportZone zone = mdsalUtils.read(LogicalDatastoreType.CONFIGURATION, inst);
221 deleteTransportZone(zone, dpnId, tx);
222 } catch (Exception e) {
223 LOG.error("Failed to remove tunnels for dpn {} in zone {}", dpnId, zoneName, e);
230 * Update transport zones based on local_ips TEP ips mapping to underlay
232 * Deleted local_ips will be removed from the VTEP list of the corresponding
233 * transport zones.<br>
234 * Added local_ips will be added to all transport zones currently associated
236 * local_ips for whom the underlay network mapping has been changed will be
237 * updated in the VTEP lists of the corresponding transport zones.
243 * @param managerNodeId
244 * uuid of the OVS manager node
246 public void handleOvsdbNodeUpdate(Node origNode, Node updatedNode, String managerNodeId) {
248 String> origLocalIpMap = java.util.Optional
249 .ofNullable(elanBridgeManager.getOpenvswitchOtherConfigMap(origNode, LOCAL_IPS))
250 .orElse(Collections.emptyMap());
252 String> updatedLocalIpMap = java.util.Optional
253 .ofNullable(elanBridgeManager.getOpenvswitchOtherConfigMap(updatedNode, LOCAL_IPS))
254 .orElse(Collections.emptyMap());
255 MapDifference<String, String> mapDiff = Maps.difference(origLocalIpMap, updatedLocalIpMap);
256 if (mapDiff.areEqual()) {
260 java.util.Optional<BigInteger> dpIdOpt = elanBridgeManager.getDpIdFromManagerNodeId(managerNodeId);
261 if (!dpIdOpt.isPresent()) {
262 LOG.debug("No DPN id found for node {}", managerNodeId);
266 BigInteger dpId = dpIdOpt.get();
267 Optional<DPNTEPsInfo> dpnTepsInfoOpt = getDpnTepsInfo(dpId);
268 if (!dpnTepsInfoOpt.isPresent()) {
269 LOG.debug("No DPNTEPsInfo found for DPN id {}", dpId);
273 List<TunnelEndPoints> tunnelEndPoints = dpnTepsInfoOpt.get().getTunnelEndPoints();
274 if (tunnelEndPoints == null || tunnelEndPoints.isEmpty()) {
275 LOG.debug("No tunnel endpoints defined for DPN id {}", dpId);
279 Set<String> zonePrefixes = new HashSet<>();
280 Map<String, List<String>> tepTzMap = tunnelEndPoints.stream().collect(Collectors
281 .toMap(tep -> String.valueOf(tep.getIpAddress().getValue()), this::getTepTransportZoneNames));
282 LOG.trace("Transport zone prefixes {}", tepTzMap);
284 WriteTransaction tx = dataBroker.newWriteOnlyTransaction();
285 handleRemovedLocalIps(mapDiff.entriesOnlyOnLeft(), dpId, zonePrefixes, tepTzMap, tx);
286 handleChangedLocalIps(mapDiff.entriesDiffering(), dpId, zonePrefixes, tepTzMap, tx);
287 handleAddedLocalIps(mapDiff.entriesOnlyOnRight(), dpId, zonePrefixes, tx);
291 private void handleAddedLocalIps(Map<String, String> addedEntries, BigInteger dpId, Set<String> zonePrefixes,
292 WriteTransaction tx) {
293 if (addedEntries == null || addedEntries.isEmpty()) {
294 LOG.trace("No added local_ips found for DPN {}", dpId);
298 LOG.debug("Added local_ips {} on DPN {}", addedEntries.keySet(), dpId);
299 addedEntries.forEach((ipAddress, underlayNetworkName) -> zonePrefixes.forEach(zonePrefix -> {
300 String zoneName = getTzNameForUnderlayNetwork(zonePrefix, underlayNetworkName);
301 updateTransportZone(zoneName, dpId, ipAddress, tx);
305 private void handleChangedLocalIps(Map<String, ValueDifference<String>> changedEntries, BigInteger dpId,
306 Set<String> zonePrefixes, Map<String, List<String>> tepTzMap, WriteTransaction tx) {
307 if (changedEntries == null || changedEntries.isEmpty()) {
308 LOG.trace("No changed local_ips found for DPN {}", dpId);
312 LOG.debug("Changing underlay network mapping for local_ips {} on DPN {}", changedEntries.keySet(), dpId);
313 changedEntries.forEach((ipAddress, underlayNetworkDiff) -> {
314 List<String> zoneNames = tepTzMap.get(ipAddress);
315 if (zoneNames != null) {
316 for (String zoneName : zoneNames) {
317 String removedUnderlayNetwork = underlayNetworkDiff.leftValue();
318 String addedUnderlayNetwork = underlayNetworkDiff.rightValue();
319 Optional<String> zonePrefixOpt = getZonePrefixForUnderlayNetwork(zoneName, removedUnderlayNetwork);
320 if (zonePrefixOpt.isPresent()) {
321 String zonePrefix = zonePrefixOpt.get();
322 removeVtep(zoneName, dpId, ipAddress, tx);
323 zonePrefixes.add(zonePrefix);
324 String newZoneName = getTzNameForUnderlayNetwork(zonePrefix, addedUnderlayNetwork);
325 updateTransportZone(newZoneName, dpId, ipAddress, tx);
332 private void handleRemovedLocalIps(Map<String, String> removedEntries, BigInteger dpId, Set<String> zonePrefixes,
333 Map<String, List<String>> tepTzMap, WriteTransaction tx) {
334 if (removedEntries == null || removedEntries.isEmpty()) {
335 LOG.trace("No removed local_ips found on DPN {}", dpId);
339 LOG.debug("Removed local_ips {} for DPN {}", removedEntries.keySet(), dpId);
340 removedEntries.forEach((ipAddress, underlayNetworkName) -> {
341 List<String> zoneNames = tepTzMap.get(ipAddress);
342 if (zoneNames != null) {
343 for (String zoneName : zoneNames) {
344 Optional<String> zonePrefix = getZonePrefixForUnderlayNetwork(zoneName, underlayNetworkName);
345 if (zonePrefix.isPresent()) {
346 removeVtep(zoneName, dpId, ipAddress, tx);
347 zonePrefixes.add(zonePrefix.get());
354 private List<String> getTepTransportZoneNames(TunnelEndPoints tep) {
355 List<TzMembership> tzMembershipList = tep.getTzMembership();
356 if (tzMembershipList == null) {
357 LOG.debug("No TZ membership exist for TEP ip {}", tep.getIpAddress().getValue());
358 return Collections.emptyList();
361 return tzMembershipList.stream().map(TzMembership::getZoneName).distinct()
362 .collect(Collectors.toList());
365 private Optional<DPNTEPsInfo> getDpnTepsInfo(BigInteger dpId) {
366 InstanceIdentifier<DPNTEPsInfo> identifier = InstanceIdentifier.builder(DpnEndpoints.class)
367 .child(DPNTEPsInfo.class, new DPNTEPsInfoKey(dpId)).build();
369 return SingleTransactionDataBroker.syncReadOptional(dataBroker, LogicalDatastoreType.CONFIGURATION,
371 } catch (ReadFailedException e) {
372 LOG.warn("Failed to read DPNTEPsInfo for DPN id {}", dpId);
373 return Optional.absent();
378 * Tries to add a vtep for a transport zone.
380 * @return Whether a vtep was added or not.
382 private boolean addVtep(TransportZone zone, String subnetIp, BigInteger dpnId, String localIp) {
383 List<Subnets> zoneSubnets = zone.getSubnets();
384 if (zoneSubnets == null) {
388 Subnets subnets = getOrAddSubnet(zoneSubnets, subnetIp);
389 for (Vteps existingVtep : subnets.getVteps()) {
390 if (existingVtep.getDpnId().equals(dpnId)) {
395 if (localIp != null) {
396 IpAddress nodeIp = new IpAddress(localIp.toCharArray());
397 VtepsBuilder vtepsBuilder = new VtepsBuilder().setDpnId(dpnId).setIpAddress(nodeIp)
398 .setPortname(TUNNEL_PORT).setOptionOfTunnel(elanConfig.isUseOfTunnels());
399 subnets.getVteps().add(vtepsBuilder.build());
406 private void removeVtep(String zoneName, BigInteger dpId, String localIp, WriteTransaction tx) {
407 InstanceIdentifier<Vteps> path = InstanceIdentifier.builder(TransportZones.class)
408 .child(TransportZone.class, new TransportZoneKey(zoneName))
409 .child(Subnets.class, new SubnetsKey(new IpPrefix(ALL_SUBNETS.toCharArray())))
410 .child(Vteps.class, new VtepsKey(dpId, TUNNEL_PORT)).build();
413 SingleTransactionDataBroker.syncDelete(dataBroker, LogicalDatastoreType.CONFIGURATION, path);
414 } catch (TransactionCommitFailedException e) {
415 LOG.error("Failed to remove VTEP {} from transport-zone {} for DPN {}", localIp, zoneName, dpId);
418 tx.delete(LogicalDatastoreType.CONFIGURATION, path);
422 // search for relevant subnets for the given subnetIP, add one if it is
424 private Subnets getOrAddSubnet(@Nonnull List<Subnets> subnets, @Nonnull String subnetIp) {
425 IpPrefix subnetPrefix = new IpPrefix(subnetIp.toCharArray());
427 for (Subnets subnet : subnets) {
428 if (subnet.getPrefix().equals(subnetPrefix)) {
433 Subnets retSubnet = buildSubnets(subnetIp);
434 subnets.add(retSubnet);
439 private Subnets buildSubnets(String subnetIp) {
440 SubnetsBuilder subnetsBuilder = new SubnetsBuilder().setDeviceVteps(new ArrayList<>())
441 .setGatewayIp(new IpAddress(ALL_SUBNETS_GW.toCharArray()))
442 .setKey(new SubnetsKey(new IpPrefix(subnetIp.toCharArray()))).setVlanId(0)
443 .setVteps(new ArrayList<Vteps>());
444 return subnetsBuilder.build();
447 private String getDpnLocalIp(BigInteger dpId) {
448 Optional<Node> node = getPortsNode(dpId);
450 if (node.isPresent()) {
451 String localIp = southBoundUtils.getOpenvswitchOtherConfig(node.get(), LOCAL_IP);
452 if (localIp == null) {
453 LOG.error("missing local_ip key in ovsdb:openvswitch-other-configs in operational"
454 + " network-topology for node: " + node.get().getNodeId().getValue());
463 private Map<String, String> getDpnLocalIps(BigInteger dpId) {
464 // Example of local IPs from other_config:
465 // local_ips="10.0.43.159:MPLS,11.11.11.11:DSL,ip:underlay-network"
467 node = getPortsNode(dpId);
468 if (node.isPresent()) {
469 return elanBridgeManager.getOpenvswitchOtherConfigMap(node.get(), LOCAL_IPS);
475 @SuppressWarnings("unchecked")
476 private Optional<Node> getPortsNode(BigInteger dpnId) {
477 InstanceIdentifier<BridgeRefEntry> bridgeRefInfoPath = InstanceIdentifier.create(BridgeRefInfo.class)
478 .child(BridgeRefEntry.class, new BridgeRefEntryKey(dpnId));
480 // FIXME: Read this through a cache
481 BridgeRefEntry bridgeRefEntry = mdsalUtils.read(LogicalDatastoreType.OPERATIONAL, bridgeRefInfoPath);
482 if (bridgeRefEntry == null) {
483 LOG.error("no bridge ref entry found for dpnId: " + dpnId);
484 return Optional.absent();
487 InstanceIdentifier<Node> nodeId = ((InstanceIdentifier<OvsdbBridgeAugmentation>) bridgeRefEntry
488 .getBridgeReference().getValue()).firstIdentifierOf(Node.class);
490 // FIXME: Read this through a cache
491 Node node = mdsalUtils.read(LogicalDatastoreType.OPERATIONAL, nodeId);
494 LOG.error("missing node for dpnId: " + dpnId);
495 return Optional.absent();
498 return Optional.of(node);
501 private String getTzNameForUnderlayNetwork(String zoneNamePrefix, String underlayNetworkName) {
502 return zoneNamePrefix + IP_NETWORK_ZONE_NAME_DELIMITER + underlayNetworkName;
505 private Optional<String> getZonePrefixForUnderlayNetwork(String zoneName, String underlayNetworkName) {
506 String[] zoneParts = zoneName.split(IP_NETWORK_ZONE_NAME_DELIMITER + underlayNetworkName);
507 return zoneParts.length == 2 ? Optional.of(zoneParts[0]) : Optional.absent();