1 files changed, 142 insertions, 0 deletions
diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/read/Nat64PrefixesCustomizer.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/read/Nat64PrefixesCustomizer.java
new file mode 100644
index 000000000..badc6e9bd
--- /dev/null
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/read/Nat64PrefixesCustomizer.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.nat.read;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.collect.Maps;
+import com.google.common.primitives.UnsignedBytes;
+import com.google.common.primitives.UnsignedInts;
+import io.fd.hc2vpp.common.translate.util.Ipv6Translator;
+import io.fd.hc2vpp.common.translate.util.JvppReplyConsumer;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.spi.read.ListReaderCustomizer;
+import io.fd.honeycomb.translate.util.read.cache.DumpCacheManager;
+import io.fd.honeycomb.translate.util.read.cache.EntityDumpExecutor;
+import io.fd.honeycomb.translate.util.read.cache.StaticCacheKeyFactory;
+import io.fd.vpp.jvpp.nat.dto.Nat64PrefixDetails;
+import io.fd.vpp.jvpp.nat.dto.Nat64PrefixDetailsReplyDump;
+import io.fd.vpp.jvpp.nat.dto.Nat64PrefixDump;
+import io.fd.vpp.jvpp.nat.future.FutureJVppNatFacade;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.Nat64Prefixes;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.Nat64PrefixesBuilder;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.Nat64PrefixesKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.state.nat.instances.NatInstance;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.state.nat.instances.NatInstanceKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.state.nat.instances.nat.instance.NatCurrentConfigBuilder;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class Nat64PrefixesCustomizer
+        implements ListReaderCustomizer<Nat64Prefixes, Nat64PrefixesKey, Nat64PrefixesBuilder>,
+        JvppReplyConsumer, Ipv6Translator {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Nat64PrefixesCustomizer.class);
+
+    private final DumpCacheManager<Map<Long, Nat64PrefixDetails>, Void> dumpManager;
+
+    Nat64PrefixesCustomizer(@Nonnull final FutureJVppNatFacade jvppNat) {
+        this.dumpManager = new DumpCacheManager.DumpCacheManagerBuilder<Map<Long, Nat64PrefixDetails>, Void>()
+                .withExecutor(new Nat64PrefixesExecutor(jvppNat))
+                .withCacheKeyFactory(
+                        new StaticCacheKeyFactory(Nat64PrefixesCustomizer.class.getName() + "_dump", Map.class))
+                .build();
+    }
+
+    @Nonnull
+    @Override
+    public List<Nat64PrefixesKey> getAllIds(@Nonnull final InstanceIdentifier<Nat64Prefixes> id,
+                                            @Nonnull final ReadContext context)
+            throws ReadFailedException {
+        final NatInstanceKey natKey = id.firstKeyOf(NatInstance.class);
+        LOG.trace("Listing IDs for all nat64 prefixes within nat-instance(vrf): {}", natKey);
+
+        final Map<Long, Nat64PrefixDetails> prefixesByVrfId =
+                dumpManager.getDump(id, context.getModificationCache(), null).get();
+        final Nat64PrefixDetails nat64PrefixDetails = prefixesByVrfId.get(natKey.getId());
+        if (nat64PrefixDetails != null) {
+            // VPP supports only single nat64-prefix per VRF/nat-instance (we map nat-instances to VRFs)
+            // To ensure that (and for simplicity), we set nat64-prefix-id to 0.
+            return Collections.singletonList(new Nat64PrefixesKey(0L));
+        } else {
+            return Collections.emptyList();
+        }
+    }
+
+    @Override
+    public void merge(@Nonnull final Builder<? extends DataObject> builder,
+                      @Nonnull final List<Nat64Prefixes> readData) {
+        ((NatCurrentConfigBuilder) builder).setNat64Prefixes(readData);
+    }
+
+    @Nonnull
+    @Override
+    public Nat64PrefixesBuilder getBuilder(@Nonnull final InstanceIdentifier<Nat64Prefixes> id) {
+        return new Nat64PrefixesBuilder();
+    }
+
+    @Override
+    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<Nat64Prefixes> id,
+                                      @Nonnull final Nat64PrefixesBuilder builder, @Nonnull final ReadContext context)
+            throws ReadFailedException {
+        LOG.trace("Reading nat64-prefixes: {}", id);
+        final long prefixId = id.firstKeyOf(Nat64Prefixes.class).getNat64PrefixId().longValue();
+        if (prefixId != 0L) {
+            // Ignore non zero IDs (VPP supports single nat64 prefix per VRF)
+            return;
+        }
+        final Map<Long, Nat64PrefixDetails> prefixesByVrfId =
+                dumpManager.getDump(id, context.getModificationCache(), null).get();
+        final Nat64PrefixDetails prefixDetails = prefixesByVrfId.get(id.firstKeyOf(NatInstance.class).getId());
+        if (prefixDetails != null) {
+            builder.setNat64PrefixId(prefixId);
+            builder.setNat64Prefix(
+                    arrayToIpv6Prefix(prefixDetails.prefix, UnsignedBytes.toInt(prefixDetails.prefixLen)));
+        }
+    }
+
+    private final class Nat64PrefixesExecutor implements EntityDumpExecutor<Map<Long, Nat64PrefixDetails>, Void> {
+        private final FutureJVppNatFacade jvppNat;
+
+        private Nat64PrefixesExecutor(@Nonnull final FutureJVppNatFacade jvppNat) {
+            this.jvppNat = checkNotNull(jvppNat, "jvppNat should not be null");
+        }
+
+        @Nonnull
+        @Override
+        public Map<Long, Nat64PrefixDetails> executeDump(final InstanceIdentifier<?> id, final Void params)
+                throws ReadFailedException {
+            final Nat64PrefixDetailsReplyDump dump =
+                    getReplyForRead(jvppNat.nat64PrefixDump(new Nat64PrefixDump()).toCompletableFuture(), id);
+            // To improve read performance (if multiple nat instances are defined),
+            // we store map instead of list of prefixes.
+
+            // Current nat64-prefixes mapping relies on the fact, that VPP supports single prefix for VRF.
+            // To validate that we rely on Guava's Maps.uniqueIndex which trows IllegalStateException
+            // if duplicate key is found.
+            return Maps.uniqueIndex(dump.nat64PrefixDetails, prefixDetails -> UnsignedInts.toLong(prefixDetails.vrfId));
+        }
+    }
+}