replicate/mdsal-replicate-netty/src/main/java/org/opendaylight/mdsal/replicate/netty/SinkRequestHandler.java

   1 /*
   2  * Copyright (c) 2020 PANTHEON.tech, s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.mdsal.replicate.netty;
   9
  10 import static com.google.common.base.Preconditions.checkState;
  11 import static com.google.common.base.Verify.verify;
  12 import static java.util.Objects.requireNonNull;
  13
  14 import com.google.common.util.concurrent.FutureCallback;
  15 import com.google.common.util.concurrent.MoreExecutors;
  16 import io.netty.buffer.ByteBuf;
  17 import io.netty.buffer.ByteBufInputStream;
  18 import io.netty.buffer.Unpooled;
  19 import io.netty.channel.Channel;
  20 import io.netty.channel.ChannelHandlerContext;
  21 import io.netty.channel.SimpleChannelInboundHandler;
  22 import java.io.IOException;
  23 import java.util.ArrayList;
  24 import java.util.List;
  25 import org.opendaylight.mdsal.common.api.CommitInfo;
  26 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  27 import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteTransaction;
  28 import org.opendaylight.mdsal.dom.api.DOMTransactionChain;
  29 import org.opendaylight.mdsal.replicate.common.DataTreeCandidateUtils;
  30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  32 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  33 import org.opendaylight.yangtools.yang.data.api.schema.stream.ReusableStreamReceiver;
  34 import org.opendaylight.yangtools.yang.data.codec.binfmt.DataTreeCandidateInputOutput;
  35 import org.opendaylight.yangtools.yang.data.codec.binfmt.NormalizedNodeDataInput;
  36 import org.opendaylight.yangtools.yang.data.impl.schema.ReusableImmutableNormalizedNodeStreamWriter;
  37 import org.opendaylight.yangtools.yang.data.spi.node.ImmutableNodes;
  38 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  39 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  40 import org.slf4j.Logger;
  41 import org.slf4j.LoggerFactory;
  42
  43 final class SinkRequestHandler extends SimpleChannelInboundHandler<ByteBuf> {
  44     private static final Logger LOG = LoggerFactory.getLogger(SinkRequestHandler.class);
  45     private static final ContainerNode EMPTY_ROOT = ImmutableNodes.newContainerBuilder()
  46         .withNodeIdentifier(NodeIdentifier.create(SchemaContext.NAME))
  47         .build();
  48
  49     private final ReusableStreamReceiver receiver = ReusableImmutableNormalizedNodeStreamWriter.create();
  50     private final List<ByteBuf> chunks = new ArrayList<>();
  51     private final DOMDataTreeIdentifier tree;
  52     private final DOMTransactionChain chain;
  53
  54     SinkRequestHandler(final DOMDataTreeIdentifier tree, final DOMTransactionChain chain) {
  55         this.tree = requireNonNull(tree);
  56         this.chain = requireNonNull(chain);
  57     }
  58
  59     @Override
  60     protected void channelRead0(final ChannelHandlerContext ctx, final ByteBuf msg) throws IOException {
  61         verify(msg.isReadable(), "Empty message received");
  62
  63         final short msgType = msg.readUnsignedByte();
  64         final Channel channel = ctx.channel();
  65         LOG.trace("Channel {} received message type {}", channel, msgType);
  66         switch (msgType) {
  67             case Constants.MSG_EMPTY_DATA -> handleEmptyData();
  68             case Constants.MSG_DTC_CHUNK -> chunks.add(msg.retain());
  69             case Constants.MSG_DTC_APPLY -> handleDtcApply();
  70             case Constants.MSG_PING -> {
  71                 LOG.trace("Received PING from Source, sending PONG");
  72                 ctx.channel().writeAndFlush(Constants.PONG);
  73             }
  74             default -> throw new IllegalStateException("Unexpected message type " + msgType);
  75         }
  76     }
  77
  78     private void handleEmptyData() {
  79         final var tx = chain.newWriteOnlyTransaction();
  80
  81         if (tree.path().isEmpty()) {
  82             tx.put(tree.datastore(), YangInstanceIdentifier.of(), EMPTY_ROOT);
  83         } else {
  84             tx.delete(tree.datastore(), tree.path());
  85         }
  86         commit(tx);
  87     }
  88
  89     private void handleDtcApply() throws IOException {
  90         checkState(!chunks.isEmpty(), "No chunks to apply");
  91
  92         final ByteBuf bufs = Unpooled.wrappedBuffer(chunks.toArray(new ByteBuf[0]));
  93         chunks.clear();
  94
  95         final DataTreeCandidate candidate;
  96         try (ByteBufInputStream stream = new ByteBufInputStream(bufs)) {
  97             candidate = DataTreeCandidateInputOutput.readDataTreeCandidate(NormalizedNodeDataInput.newDataInput(stream),
  98                 receiver);
  99         }
 100
 101         final DOMDataTreeWriteTransaction tx = chain.newWriteOnlyTransaction();
 102         DataTreeCandidateUtils.applyToTransaction(tx, tree.datastore(), candidate);
 103         commit(tx);
 104     }
 105
 106     private static void commit(final DOMDataTreeWriteTransaction tx) {
 107         tx.commit().addCallback(new FutureCallback<CommitInfo>() {
 108             @Override
 109             public void onSuccess(final CommitInfo result) {
 110                 LOG.trace("Transaction committed with {}", result);
 111             }
 112
 113             @Override
 114             public void onFailure(final Throwable cause) {
 115                 // Handled by transaction chain listener
 116             }
 117         }, MoreExecutors.directExecutor());
 118     }
 119 }