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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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 io.fd.honeycomb.v3po.impl;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import java.util.Collection;
import java.util.Collections;
import javax.annotation.Nonnull;
import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
import org.opendaylight.controller.md.sal.dom.api.DOMMountPoint;
import org.opendaylight.controller.md.sal.dom.api.DOMMountPointService;
import org.opendaylight.controller.sal.core.api.Broker;
import org.opendaylight.controller.sal.core.api.Provider;
import org.opendaylight.controller.sal.core.api.model.SchemaService;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeBuilder;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
import org.opendaylight.yangtools.binding.data.codec.api.BindingNormalizedNodeSerializer;
import org.opendaylight.yangtools.concepts.ObjectRegistration;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Creates VppDataBroker which uses DataTree instead of DataStore internally in order to obtain better control over the
* data processing in Honeycomb agent
*/
public final class VppDataBrokerInitializationProvider implements Provider, AutoCloseable {
private static final Logger LOG = LoggerFactory.getLogger(VppDataBrokerInitializationProvider.class);
private final TopologyId VPP_TOPOLOGY_ID = TopologyId.getDefaultInstance("vpp-topology");
private final NodeId VPP_TOPOLOGY_NODE_ID = NodeId.getDefaultInstance("vpp");
private final org.opendaylight.controller.md.sal.binding.api.DataBroker bindingBroker;
private final InstanceIdentifier<Node> mountPointPath;
private final BindingNormalizedNodeSerializer serializer;
private ObjectRegistration<DOMMountPoint> mountPointRegistration;
private final DOMDataBroker domDataBroker;
public VppDataBrokerInitializationProvider(
@Nonnull final org.opendaylight.controller.md.sal.binding.api.DataBroker bindingBroker,
@Nonnull final BindingNormalizedNodeSerializer serializer,
@Nonnull final DOMDataBroker domDataBroker) {
this.bindingBroker = checkNotNull(bindingBroker, "bindingBroker should not be null");
this.serializer = checkNotNull(serializer, "serializer should not be null");
this.domDataBroker = checkNotNull(domDataBroker, "domDataBroker should not be null");
this.mountPointPath = getMountPointPath();
}
// TODO make configurable
private InstanceIdentifier<Node> getMountPointPath() {
final InstanceIdentifier<NetworkTopology> networkTopology =
InstanceIdentifier.builder(NetworkTopology.class).build();
final KeyedInstanceIdentifier<Topology, TopologyKey> topology =
networkTopology.child(Topology.class, new TopologyKey(VPP_TOPOLOGY_ID));
return topology.child(Node.class, new NodeKey(VPP_TOPOLOGY_NODE_ID));
}
@Override
public void onSessionInitiated(final Broker.ProviderSession providerSession) {
LOG.info("Session initialized, providerSession={}", providerSession);
Preconditions.checkState(!isMountPointRegistered(), "Mount point is already registered");
final DOMMountPointService mountPointService = providerSession.getService(DOMMountPointService.class);
final SchemaService schemaService = providerSession.getService(SchemaService.class);
final SchemaContext globalContext = schemaService.getGlobalContext();
final YangInstanceIdentifier path = serializer.toYangInstanceIdentifier(mountPointPath);
final DOMMountPointService.DOMMountPointBuilder mountPointBuilder = mountPointService.createMountPoint(path);
mountPointBuilder.addInitialSchemaContext(globalContext);
mountPointBuilder.addService(DOMDataBroker.class, domDataBroker);
mountPointRegistration = mountPointBuilder.register();
final DOMMountPoint mountPoint = mountPointRegistration.getInstance();
LOG.debug("Created mountPoint: identifier={}, schemaContext={}", mountPoint.getIdentifier(),
mountPoint.getSchemaContext());
createMountPointPlaceholder();
}
@Override
public Collection<ProviderFunctionality> getProviderFunctionality() {
return Collections.EMPTY_LIST;
}
private boolean isMountPointRegistered() {
final ReadOnlyTransaction readTx = bindingBroker.newReadOnlyTransaction();
try {
final Optional<Node> cfgPlaceholder =
readTx.read(LogicalDatastoreType.CONFIGURATION, mountPointPath).checkedGet();
final Optional<Node> operPlaceholder =
readTx.read(LogicalDatastoreType.OPERATIONAL, mountPointPath).checkedGet();
return cfgPlaceholder.isPresent() || operPlaceholder.isPresent();
} catch (ReadFailedException e) {
throw new IllegalStateException("Failed to read mountpoint placeholder data", e);
}
}
/**
* Writes placeholder data into MD-SAL's global datastore to indicate the presence of VPP mountpoint.
*/
private void createMountPointPlaceholder() {
final NodeBuilder nodeBuilder = new NodeBuilder();
nodeBuilder.setKey(new NodeKey(VPP_TOPOLOGY_NODE_ID));
final Node node = nodeBuilder.build();
final WriteTransaction writeTx = bindingBroker.newWriteOnlyTransaction();
writeTx.merge(LogicalDatastoreType.CONFIGURATION, mountPointPath, node, true);
writeTx.merge(LogicalDatastoreType.OPERATIONAL, mountPointPath, node, true);
try {
writeTx.submit().checkedGet();
} catch (TransactionCommitFailedException e) {
throw new IllegalStateException("Failed to create mountpoint placeholder", e);
}
}
public Optional<DOMDataBroker> getBroker() {
return Optional.fromNullable(domDataBroker);
}
@Override
public void close() throws Exception {
if (mountPointRegistration != null) {
mountPointRegistration.close();
}
// remove MD-SAL placeholder data for VPP mount point:
final WriteTransaction rwTx = bindingBroker.newWriteOnlyTransaction();
// does not fail if data is not present:
rwTx.delete(LogicalDatastoreType.CONFIGURATION, mountPointPath);
rwTx.delete(LogicalDatastoreType.OPERATIONAL, mountPointPath);
try {
rwTx.submit().checkedGet();
} catch (TransactionCommitFailedException e) {
throw new IllegalStateException("Failed to remove mountpoint's placeholder from MD-SAL's global datastore",
e);
}
}
}
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