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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 javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
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.policy.context.attributes.Srv6PolicyMappings;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMapping;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMappingBuilder;
import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMappingKey;
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 Srv6PolicyMappings}.
*/
@ThreadSafe
public class PolicyContextManagerImpl implements PolicyContextManager {
private final InstanceIdentifier<Srv6PolicyMappings> ctxIid;
// 2001:db8::/32 This address range is used for documentation and example source code. We can use it as dummy
// addresses for our artificial policies
private static final String DUMMY_EP = "2001:db8::";
private Long artificialColor;
public PolicyContextManagerImpl() {
this.ctxIid = InstanceIdentifier.create(Contexts.class)
.augmentation(Srv6PolicyContextAugmentation.class)
.child(Srv6PolicyMappings.class);
this.artificialColor = 0L;
}
@Override
public void addPolicy(@Nonnull final String name, @Nonnull final Long color, @Nonnull final Ipv6Address endpoint,
@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx) {
final KeyedInstanceIdentifier<Srv6PolicyMapping, Srv6PolicyMappingKey> mappingIid = getPolicyIid(bsid);
final Srv6PolicyMappingBuilder builder =
new Srv6PolicyMappingBuilder().withKey(new Srv6PolicyMappingKey(bsid)).setColor(color)
.setEndpoint(endpoint).setBsid(bsid).setName(name);
ctx.put(mappingIid, builder.build());
}
private KeyedInstanceIdentifier<Srv6PolicyMapping, Srv6PolicyMappingKey> getPolicyIid(final Ipv6Address bsid) {
return ctxIid.child(Srv6PolicyMapping.class, new Srv6PolicyMappingKey(bsid));
}
@Nonnull
public synchronized Srv6PolicyMapping getPolicy(@Nonnull final Ipv6Address bsid,
@Nonnull final MappingContext ctx) {
final Optional<Srv6PolicyMapping> read = ctx.read(getPolicyIid(bsid));
if (read.isPresent()) {
return read.get();
}
//if not present we need to generate artificial mapping
Long nextArtificialColor = getNextArtificialColor();
Ipv6Address endpoint = new Ipv6Address(DUMMY_EP + nextArtificialColor);
Srv6PolicyMapping mapping =
new Srv6PolicyMappingBuilder().setBsid(bsid).setColor(nextArtificialColor).setEndpoint(endpoint)
.setName(bsid.getValue()).build();
addPolicy(mapping.getName(), mapping.getColor(), mapping.getEndpoint(), mapping.getBsid(), ctx);
return mapping;
}
@Override
public Ipv6Address getPolicyBsid(@Nonnull Long color, @Nonnull Ipv6Address endpoint,
@Nonnull final MappingContext ctx) {
Optional<Srv6PolicyMappings> read = ctx.read(ctxIid);
if (read.isPresent()) {
return read.get().getSrv6PolicyMapping().stream()
.filter(srv6PolicyMapping -> srv6PolicyMapping.getColor().equals(color) &&
srv6PolicyMapping.getEndpoint().equals(endpoint))
.map(Srv6PolicyMapping::getBsid).findFirst().orElse(null);
}
return null;
}
@Override
public void removePolicy(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx) {
final KeyedInstanceIdentifier<Srv6PolicyMapping, Srv6PolicyMappingKey> mappingIid = getPolicyIid(bsid);
ctx.delete(mappingIid);
}
private synchronized Long getNextArtificialColor() {
artificialColor++;
return artificialColor;
}
}
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