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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.write.policy;
import com.google.common.base.Preconditions;
import io.fd.hc2vpp.common.translate.util.FutureJVppCustomizer;
import io.fd.hc2vpp.fib.management.FibManagementIIds;
import io.fd.hc2vpp.srv6.Srv6PolicyIIds;
import io.fd.hc2vpp.srv6.util.CandidatePathContextManager;
import io.fd.hc2vpp.srv6.util.PolicyContextManager;
import io.fd.hc2vpp.srv6.util.Srv6Util;
import io.fd.hc2vpp.srv6.write.policy.request.PolicyDeleteRequest;
import io.fd.hc2vpp.srv6.write.policy.request.PolicyWriteRequest;
import io.fd.hc2vpp.srv6.write.policy.request.dto.SidList;
import io.fd.honeycomb.translate.read.ReadFailedException;
import io.fd.honeycomb.translate.spi.write.ListWriterCustomizer;
import io.fd.honeycomb.translate.write.WriteContext;
import io.fd.honeycomb.translate.write.WriteFailedException;
import io.fd.vpp.jvpp.core.future.FutureJVppCore;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import javax.annotation.Nonnull;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.BindingSidAllocMode;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.DataplaneType;
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.candidate.paths.candidate.paths.CandidatePath;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.named.segment.lists.named.segment.lists.NamedSegmentList;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.named.segment.lists.named.segment.lists.NamedSegmentListKey;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.path.segment.list.properties.segment.lists.SegmentList;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.policies.policies.Policy;
import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.policies.policies.PolicyKey;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.fib.table.management.rev180521.VniReference;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.fib.table.management.rev180521.vpp.fib.table.management.fib.tables.Table;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.fib.table.management.rev180521.vpp.fib.table.management.fib.tables.TableKey;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.oc.srte.policy.rev180514.VppSrPolicyAugmentation;
import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.oc.srte.policy.rev180514.sr.policy.Config;
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;
public class PolicyCustomizer extends FutureJVppCustomizer
implements ListWriterCustomizer<Policy, PolicyKey> {
private final PolicyContextManager policyContext;
private final CandidatePathContextManager candidateContext;
public PolicyCustomizer(@Nonnull final FutureJVppCore futureJVppCore,
@Nonnull final PolicyContextManager policyContext,
@Nonnull final CandidatePathContextManager candidateContext) {
super(futureJVppCore);
this.policyContext = policyContext;
this.candidateContext = candidateContext;
}
@Override
public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Policy> instanceIdentifier,
@Nonnull final Policy policy,
@Nonnull final WriteContext writeContext) throws WriteFailedException {
try {
// Fib table must be created beforehand. First we check if all data is present, then we verify the existence
// of FIB table in current configuration
VppSrPolicyAugmentation policyAugmentation = policy.augmentation(VppSrPolicyAugmentation.class);
if (policyAugmentation != null && policyAugmentation.getVppSrPolicy() != null &&
policyAugmentation.getVppSrPolicy().getConfig() != null) {
Config config = policyAugmentation.getVppSrPolicy().getConfig();
TableKey tableKey = new TableKey(config.getAddressFamily(), new VniReference(config.getTableId()));
KeyedInstanceIdentifier<Table, TableKey> vrfIid =
FibManagementIIds.FM_FIB_TABLES.child(Table.class, tableKey);
if (!writeContext.readAfter(vrfIid).isPresent()) {
throw new IllegalArgumentException(
String.format("VRF table: %s not found. Create table before writing policy.", tableKey));
}
if (policy.getCandidatePaths() != null && !policy.getCandidatePaths().getCandidatePath().isEmpty()) {
bindWriteRequest(config, policy.getCandidatePaths().getCandidatePath(), writeContext)
.write(instanceIdentifier);
Ipv6Address bsid = Srv6Util.extractBsid(instanceIdentifier, writeContext, true);
policyContext.addPolicy(policy.getName(), policy.getColor(), policy.getEndpoint().getIpv6Address(),
bsid, writeContext.getMappingContext());
}
} else {
throw new ReadFailedException(instanceIdentifier,
new Throwable("VppSrPolicyAugmentation and/or VppSrPolicy missing."));
}
} catch (ReadFailedException e) {
throw new WriteFailedException.CreateFailedException(instanceIdentifier, policy, e);
}
}
@Override
public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Policy> instanceIdentifier,
@Nonnull final Policy policy, @Nonnull final WriteContext writeContext)
throws WriteFailedException {
if (policy.getCandidatePaths() != null && !policy.getCandidatePaths().getCandidatePath().isEmpty()) {
bindDeleteRequest(policy.getCandidatePaths().getCandidatePath(), writeContext).delete(instanceIdentifier);
Ipv6Address bsid = Srv6Util.extractBsid(instanceIdentifier, writeContext, false);
Preconditions.checkNotNull(bsid, "BSID must not be null");
policyContext.removePolicy(bsid, writeContext.getMappingContext());
}
}
private PolicyDeleteRequest bindDeleteRequest(final @Nonnull List<CandidatePath> candidatePaths,
final @Nonnull WriteContext writeContext) {
final PolicyDeleteRequest request = new PolicyDeleteRequest(getFutureJVpp());
Optional<CandidatePath> candidatePathOptional = parseBestCandidate(candidatePaths);
Preconditions.checkArgument(candidatePathOptional.isPresent(),
"Could not parse best Candidate path from list: {}", candidatePaths);
CandidatePath selectedPath = candidatePathOptional.get();
if (selectedPath.getBindingSid() != null && selectedPath.getBindingSid().getConfig() != null) {
org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.binding.sid.properties.binding.sid.Config
sidConfig = selectedPath.getBindingSid().getConfig();
if (sidConfig.getType() == DataplaneType.Srv6 &&
sidConfig.getAllocMode() == BindingSidAllocMode.Explicit && sidConfig.getValue() != null &&
sidConfig.getValue().getIpAddress() != null &&
sidConfig.getValue().getIpAddress().getIpv6Address() != null) {
Ipv6Address bsid = selectedPath.getBindingSid().getConfig().getValue().getIpAddress().getIpv6Address();
request.setBindingSidAddress(bsid);
candidateContext.removeCandidatePath(bsid, writeContext.getMappingContext());
}
}
return request;
}
private PolicyWriteRequest bindWriteRequest(@Nonnull final Config config,
final List<CandidatePath> candidatePaths,
final WriteContext writeContext) {
final PolicyWriteRequest request = new PolicyWriteRequest(getFutureJVpp());
request.setFibTableIndex(config.getTableId().getValue().intValue());
request.setPolicyBehavior(config.getPolicyBehavior());
request.setPolicyType(config.getPolicyType());
Optional<CandidatePath> candidatePathOptional = parseBestCandidate(candidatePaths);
Preconditions.checkArgument(candidatePathOptional.isPresent(),
"Could not parse best Candidate path from list: {}", candidatePaths);
CandidatePath selectedPath = candidatePathOptional.get();
if (selectedPath.getBindingSid() != null && selectedPath.getBindingSid().getConfig() != null) {
org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.binding.sid.properties.binding.sid.Config
sidConfig = selectedPath.getBindingSid().getConfig();
if (sidConfig.getType() == DataplaneType.Srv6 &&
sidConfig.getAllocMode() == BindingSidAllocMode.Explicit && sidConfig.getValue() != null &&
sidConfig.getValue().getIpAddress() != null &&
sidConfig.getValue().getIpAddress().getIpv6Address() != null) {
Ipv6Address bsid = selectedPath.getBindingSid().getConfig().getValue().getIpAddress().getIpv6Address();
request.setBindingSidAddress(bsid);
candidateContext.addCandidatePath(bsid, selectedPath.getName(), selectedPath.getProvisioningMethod(),
selectedPath.getPreference(), selectedPath.getDistinguisher(),
writeContext.getMappingContext());
}
}
if (selectedPath.getSegmentLists() != null && selectedPath.getSegmentLists().getSegmentList() != null) {
request.setSegments(readSegmentLists(selectedPath.getSegmentLists().getSegmentList(), writeContext));
}
return request;
}
private List<SidList> readSegmentLists(final List<SegmentList> segmentLists, final WriteContext writeContext) {
List<SidList> sidLists = new ArrayList<>();
segmentLists.forEach(segmentList -> {
com.google.common.base.Optional<NamedSegmentList> namedSegmentListOptional = writeContext.readAfter(
Srv6PolicyIIds.SR_TE_NSLS.child(NamedSegmentList.class,
new NamedSegmentListKey(segmentList.getName())));
if (namedSegmentListOptional.isPresent()) {
sidLists.add(SidList.builder()
.setNamedSegmentList(namedSegmentListOptional.get())
.setWeight(segmentList.getConfig().getWeight())
.build());
}
});
return sidLists;
}
/**
* Selects best Candidate based on Preference value (the higher preference the better),
* only static configuration is supported for now (provisioning-method must be equal to provisioning-method-config).
*
* Based on Segment Routing Policy for Traffic Engineering
* https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-policy-00
*
* @param candidatePaths List of available CandidatePaths
* @return Optional of CandidatePath
*/
private Optional<CandidatePath> parseBestCandidate(final List<CandidatePath> candidatePaths) {
return candidatePaths.stream()
.filter(candidatePath -> candidatePath.getProvisioningMethod().equals(ProvisioningMethodConfig.class))
.max(Comparator.comparingLong(CandidatePath::getPreference));
}
}
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