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/*
* Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.hc2vpp.srv6.util;
import com.google.common.base.Optional;
import io.fd.honeycomb.translate.MappingContext;
import java.util.concurrent.atomic.AtomicLong;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.ProvisioningMethodConfig;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.ProvisioningMethodType;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.naming.context.rev160513.Contexts;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.Srv6PolicyContextAugmentation;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.Srv6CandidatePathMappings;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMapping;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMappingBuilder;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMappingKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
/**
* Facade on top of {@link MappingContext} that manages {@link Srv6CandidatePathMappings}.
*/
@ThreadSafe
public class CandidatePathContextManagerImpl implements CandidatePathContextManager {
private static final long DEFAULT_PREFERENCE = 100L;
private AtomicLong distinguisher;
private final InstanceIdentifier<Srv6CandidatePathMappings> ctxIid;
public CandidatePathContextManagerImpl() {
this.ctxIid = InstanceIdentifier.create(Contexts.class)
.augmentation(Srv6PolicyContextAugmentation.class)
.child(Srv6CandidatePathMappings.class);
distinguisher = new AtomicLong(0L);
}
@Override
public void addCandidatePath(@Nonnull Ipv6Address bsid, @Nonnull final String name,
@Nonnull final Class<? extends ProvisioningMethodType> provisioningMethod,
@Nonnull Long preference, @Nonnull Long distinguisher,
@Nonnull final MappingContext ctx) {
final KeyedInstanceIdentifier<Srv6CandidatePathMapping, Srv6CandidatePathMappingKey> mappingIid =
getCandidatePathIid(bsid);
final Srv6CandidatePathMappingBuilder builder =
new Srv6CandidatePathMappingBuilder().withKey(new Srv6CandidatePathMappingKey(bsid))
.setProvisioningMethod(provisioningMethod).setPreference(preference)
.setDistinguisher(distinguisher).setBsid(bsid).setName(name);
ctx.put(mappingIid, builder.build());
}
private KeyedInstanceIdentifier<Srv6CandidatePathMapping, Srv6CandidatePathMappingKey> getCandidatePathIid(
final Ipv6Address bsid) {
return ctxIid.child(Srv6CandidatePathMapping.class, new Srv6CandidatePathMappingKey(bsid));
}
@Override
@Nonnull
public synchronized Srv6CandidatePathMapping getCandidatePath(@Nonnull final Ipv6Address bsid,
@Nonnull final MappingContext ctx) {
final Optional<Srv6CandidatePathMappings> read = ctx.read(ctxIid);
if (read.isPresent()) {
java.util.Optional<Srv6CandidatePathMapping> mappingOpt = read.get().getSrv6CandidatePathMapping().stream()
.filter(srv6CandidatePathMapping -> srv6CandidatePathMapping.getBsid().getValue()
.equals(bsid.getValue())).findAny();
if (mappingOpt.isPresent()) {
return mappingOpt.get();
}
}
return getArtificialMapping(bsid, ctx, bsid.getValue());
}
private Srv6CandidatePathMapping getArtificialMapping(final @Nonnull Ipv6Address bsid,
final @Nonnull MappingContext ctx, final String name) {
// if not present we need to generate artificial mapping
// for given policy only one candidate path can be selected and be configured on the device.
Srv6CandidatePathMapping mapping =
new Srv6CandidatePathMappingBuilder()
.setProvisioningMethod(ProvisioningMethodConfig.class)
.setBsid(bsid) //when we read name from VPP it is always the BSID value
.setPreference(DEFAULT_PREFERENCE)
.setDistinguisher(distinguisher.incrementAndGet())
.build();
addCandidatePath(mapping.getBsid(), name, mapping.getProvisioningMethod(), mapping.getPreference(),
mapping.getDistinguisher(), ctx);
return mapping;
}
@Override
public void removeCandidatePath(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx) {
final KeyedInstanceIdentifier<Srv6CandidatePathMapping, Srv6CandidatePathMappingKey> mappingIid =
getCandidatePathIid(bsid);
ctx.delete(mappingIid);
}
}
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