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/*
* 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.store.proxyarp.impl;
import com.google.common.collect.Maps;
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.onlab.util.KryoNamespace;
import org.onosproject.cluster.ClusterService;
import org.onosproject.cluster.NodeId;
import org.onosproject.mastership.MastershipService;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.Host;
import org.onosproject.net.HostId;
import org.onosproject.net.host.HostEvent;
import org.onosproject.net.host.HostListener;
import org.onosproject.net.host.HostService;
import org.onosproject.net.proxyarp.ProxyArpStore;
import org.onosproject.net.proxyarp.ProxyArpStoreDelegate;
import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
import org.onosproject.store.cluster.messaging.MessageSubject;
import org.onosproject.store.serializers.KryoNamespaces;
import org.onosproject.store.serializers.KryoSerializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.ByteBuffer;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import static org.onlab.util.BoundedThreadPool.newFixedThreadPool;
import static org.onlab.util.Tools.groupedThreads;
/**
* Implementation of proxy ARP distribution mechanism.
*/
@Component(immediate = true)
@Service
public class DistributedProxyArpStore implements ProxyArpStore {
private Logger log = LoggerFactory.getLogger(getClass());
private static final MessageSubject ARP_RESPONSE_MESSAGE =
new MessageSubject("onos-arp-response");
protected final KryoSerializer serializer = new KryoSerializer() {
@Override
protected void setupKryoPool() {
serializerPool = KryoNamespace.newBuilder()
.register(KryoNamespaces.API)
.register(ArpResponseMessage.class)
.register(ByteBuffer.class)
.build();
}
};
private ProxyArpStoreDelegate delegate;
private Map<HostId, ArpResponseMessage> pendingMessages = Maps.newConcurrentMap();
private ExecutorService executor =
newFixedThreadPool(4, groupedThreads("onos/arp", "sender-%d"));
private NodeId localNodeId;
private HostListener hostListener = new InternalHostListener();
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected MastershipService mastershipService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected ClusterService clusterService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected ClusterCommunicationService commService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected HostService hostService;
@Activate
protected void activate() {
localNodeId = clusterService.getLocalNode().id();
hostService.addListener(hostListener);
commService.addSubscriber(ARP_RESPONSE_MESSAGE, serializer::decode,
this::processArpResponse, executor);
log.info("Started");
}
@Deactivate
protected void deactivate() {
commService.removeSubscriber(ARP_RESPONSE_MESSAGE);
hostService.removeListener(hostListener);
log.info("Stopped");
}
@Override
public void forward(ConnectPoint outPort, Host subject, ByteBuffer packet) {
/*NodeId nodeId = mastershipService.getMasterFor(outPort.deviceId());
if (nodeId.equals(localNodeId)) {
if (delegate != null) {
delegate.emitResponse(outPort, packet);
}
} else {
log.info("Forwarding ARP response from {} to {}", subject.id(), outPort);
commService.unicast(new ArpResponseMessage(outPort, subject, packet.array()),
ARP_RESPONSE_MESSAGE, serializer::encode, nodeId);
}*/
//FIXME: Code above may be unnecessary and therefore cluster messaging
// and pendingMessages could be pruned as well.
delegate.emitResponse(outPort, packet);
}
@Override
public void setDelegate(ProxyArpStoreDelegate delegate) {
this.delegate = delegate;
}
// Processes the incoming ARP response message.
private void processArpResponse(ArpResponseMessage msg) {
pendingMessages.put(msg.subject.id(), msg);
if (hostService.getHost(msg.subject.id()) != null) {
checkPendingArps(msg.subject.id());
}
// FIXME: figure out pruning so stuff does not build up
}
// Checks for pending ARP response message for the specified host.
// If one exists, emit response via delegate.
private void checkPendingArps(HostId id) {
ArpResponseMessage msg = pendingMessages.remove(id);
if (msg != null && delegate != null) {
log.info("Emitting ARP response from {} to {}", id, msg.outPort);
delegate.emitResponse(msg.outPort, ByteBuffer.wrap(msg.packet));
}
}
// Message carrying an ARP response.
private static class ArpResponseMessage {
private ConnectPoint outPort;
private Host subject;
private byte[] packet;
public ArpResponseMessage(ConnectPoint outPort, Host subject, byte[] packet) {
this.outPort = outPort;
this.subject = subject;
this.packet = packet;
}
private ArpResponseMessage() {
}
}
private class InternalHostListener implements HostListener {
@Override
public void event(HostEvent event) {
checkPendingArps(event.subject().id());
}
}
}
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