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/*
* Copyright 2014 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.net.topology.impl;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
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.apache.felix.scr.annotations.Service;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.DefaultEdgeLink;
import org.onosproject.net.DefaultPath;
import org.onosproject.net.DeviceId;
import org.onosproject.net.EdgeLink;
import org.onosproject.net.ElementId;
import org.onosproject.net.Host;
import org.onosproject.net.HostId;
import org.onosproject.net.HostLocation;
import org.onosproject.net.Link;
import org.onosproject.net.Path;
import org.onosproject.net.PortNumber;
import org.onosproject.net.host.HostService;
import org.onosproject.net.provider.ProviderId;
import org.onosproject.net.topology.LinkWeight;
import org.onosproject.net.topology.PathService;
import org.onosproject.net.topology.Topology;
import org.onosproject.net.topology.TopologyService;
import org.slf4j.Logger;
import java.util.List;
import java.util.Set;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.slf4j.LoggerFactory.getLogger;
import static org.onosproject.security.AppGuard.checkPermission;
import static org.onosproject.security.AppPermission.Type.*;
/**
* Provides implementation of a path selection service atop the current
* topology and host services.
*/
@Component(immediate = true)
@Service
public class PathManager implements PathService {
private static final String ELEMENT_ID_NULL = "Element ID cannot be null";
private static final ProviderId PID = new ProviderId("core", "org.onosproject.core");
private static final PortNumber P0 = PortNumber.portNumber(0);
private static final EdgeLink NOT_HOST = new NotHost();
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected TopologyService topologyService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected HostService hostService;
@Activate
public void activate() {
log.info("Started");
}
@Deactivate
public void deactivate() {
log.info("Stopped");
}
@Override
public Set<Path> getPaths(ElementId src, ElementId dst) {
checkPermission(TOPOLOGY_READ);
return getPaths(src, dst, null);
}
@Override
public Set<Path> getPaths(ElementId src, ElementId dst, LinkWeight weight) {
checkPermission(TOPOLOGY_READ);
checkNotNull(src, ELEMENT_ID_NULL);
checkNotNull(dst, ELEMENT_ID_NULL);
// Get the source and destination edge locations
EdgeLink srcEdge = getEdgeLink(src, true);
EdgeLink dstEdge = getEdgeLink(dst, false);
// If either edge is null, bail with no paths.
if (srcEdge == null || dstEdge == null) {
return ImmutableSet.of();
}
DeviceId srcDevice = srcEdge != NOT_HOST ? srcEdge.dst().deviceId() : (DeviceId) src;
DeviceId dstDevice = dstEdge != NOT_HOST ? dstEdge.src().deviceId() : (DeviceId) dst;
// If the source and destination are on the same edge device, there
// is just one path, so build it and return it.
if (srcDevice.equals(dstDevice)) {
return edgeToEdgePaths(srcEdge, dstEdge);
}
// Otherwise get all paths between the source and destination edge
// devices.
Topology topology = topologyService.currentTopology();
Set<Path> paths = weight == null ?
topologyService.getPaths(topology, srcDevice, dstDevice) :
topologyService.getPaths(topology, srcDevice, dstDevice, weight);
return edgeToEdgePaths(srcEdge, dstEdge, paths);
}
// Finds the host edge link if the element ID is a host id of an existing
// host. Otherwise, if the host does not exist, it returns null and if
// the element ID is not a host ID, returns NOT_HOST edge link.
private EdgeLink getEdgeLink(ElementId elementId, boolean isIngress) {
if (elementId instanceof HostId) {
// Resolve the host, return null.
Host host = hostService.getHost((HostId) elementId);
if (host == null) {
return null;
}
return new DefaultEdgeLink(PID, new ConnectPoint(elementId, P0),
host.location(), isIngress);
}
return NOT_HOST;
}
// Produces a set of edge-to-edge paths using the set of infrastructure
// paths and the given edge links.
private Set<Path> edgeToEdgePaths(EdgeLink srcLink, EdgeLink dstLink) {
Set<Path> endToEndPaths = Sets.newHashSetWithExpectedSize(1);
endToEndPaths.add(edgeToEdgePath(srcLink, dstLink, null));
return endToEndPaths;
}
// Produces a set of edge-to-edge paths using the set of infrastructure
// paths and the given edge links.
private Set<Path> edgeToEdgePaths(EdgeLink srcLink, EdgeLink dstLink, Set<Path> paths) {
Set<Path> endToEndPaths = Sets.newHashSetWithExpectedSize(paths.size());
for (Path path : paths) {
endToEndPaths.add(edgeToEdgePath(srcLink, dstLink, path));
}
return endToEndPaths;
}
// Produces a direct edge-to-edge path.
private Path edgeToEdgePath(EdgeLink srcLink, EdgeLink dstLink, Path path) {
List<Link> links = Lists.newArrayListWithCapacity(2);
// Add source and destination edge links only if they are real and
// add the infrastructure path only if it is not null.
if (srcLink != NOT_HOST) {
links.add(srcLink);
}
if (path != null) {
links.addAll(path.links());
}
if (dstLink != NOT_HOST) {
links.add(dstLink);
}
return new DefaultPath(PID, links, 2);
}
// Special value for edge link to represent that this is really not an
// edge link since the src or dst are really an infrastructure device.
private static class NotHost extends DefaultEdgeLink implements EdgeLink {
NotHost() {
super(PID, new ConnectPoint(HostId.NONE, P0),
new HostLocation(DeviceId.NONE, P0, 0L), false);
}
}
}
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