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.schema.ContainerNode;
  32 import org.opendaylight.yangtools.yang.data.api.schema.stream.ReusableStreamReceiver;
  33 import org.opendaylight.yangtools.yang.data.codec.binfmt.DataTreeCandidateInputOutput;
  34 import org.opendaylight.yangtools.yang.data.codec.binfmt.NormalizedNodeDataInput;
  35 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  36 import org.opendaylight.yangtools.yang.data.impl.schema.ReusableImmutableNormalizedNodeStreamWriter;
  37 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  38 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  39 import org.slf4j.Logger;
  40 import org.slf4j.LoggerFactory;
  41
  42 final class SinkRequestHandler extends SimpleChannelInboundHandler<ByteBuf> {
  43     private static final Logger LOG = LoggerFactory.getLogger(SinkRequestHandler.class);
  44     private static final ContainerNode EMPTY_ROOT = ImmutableNodes.containerNode(SchemaContext.NAME);
  45
  46     private final ReusableStreamReceiver receiver = ReusableImmutableNormalizedNodeStreamWriter.create();
  47     private final List<ByteBuf> chunks = new ArrayList<>();
  48     private final DOMDataTreeIdentifier tree;
  49     private final DOMTransactionChain chain;
  50
  51     SinkRequestHandler(final DOMDataTreeIdentifier tree, final DOMTransactionChain chain) {
  52         this.tree = requireNonNull(tree);
  53         this.chain = requireNonNull(chain);
  54     }
  55
  56     @Override
  57     protected void channelRead0(final ChannelHandlerContext ctx, final ByteBuf msg) throws IOException {
  58         verify(msg.isReadable(), "Empty message received");
  59
  60         final short msgType = msg.readUnsignedByte();
  61         final Channel channel = ctx.channel();
  62         LOG.trace("Channel {} received message type {}", channel, msgType);
  63         switch (msgType) {
  64             case Constants.MSG_EMPTY_DATA:
  65                 handleEmptyData();
  66                 break;
  67             case Constants.MSG_DTC_CHUNK:
  68                 chunks.add(msg.retain());
  69                 break;
  70             case Constants.MSG_DTC_APPLY:
  71                 handleDtcApply();
  72                 break;
  73             case Constants.MSG_PING:
  74                 LOG.trace("Received PING from Source, sending PONG");
  75                 ctx.channel().writeAndFlush(Constants.PONG);
  76                 break;
  77             default:
  78                 throw new IllegalStateException("Unexpected message type " + msgType);
  79         }
  80     }
  81
  82     private void handleEmptyData() {
  83         final DOMDataTreeWriteTransaction tx = chain.newWriteOnlyTransaction();
  84
  85         if (tree.getRootIdentifier().isEmpty()) {
  86             tx.put(tree.getDatastoreType(), YangInstanceIdentifier.empty(), EMPTY_ROOT);
  87         } else {
  88             tx.delete(tree.getDatastoreType(), tree.getRootIdentifier());
  89         }
  90         commit(tx);
  91     }
  92
  93     private void handleDtcApply() throws IOException {
  94         checkState(!chunks.isEmpty(), "No chunks to apply");
  95
  96         final ByteBuf bufs = Unpooled.wrappedBuffer(chunks.toArray(new ByteBuf[0]));
  97         chunks.clear();
  98
  99         final DataTreeCandidate candidate;
 100         try (ByteBufInputStream stream = new ByteBufInputStream(bufs)) {
 101             candidate = DataTreeCandidateInputOutput.readDataTreeCandidate(NormalizedNodeDataInput.newDataInput(stream),
 102                 receiver);
 103         }
 104
 105         final DOMDataTreeWriteTransaction tx = chain.newWriteOnlyTransaction();
 106         DataTreeCandidateUtils.applyToTransaction(tx, tree.getDatastoreType(), candidate);
 107         commit(tx);
 108     }
 109
 110     private static void commit(final DOMDataTreeWriteTransaction tx) {
 111         tx.commit().addCallback(new FutureCallback<CommitInfo>() {
 112             @Override
 113             public void onSuccess(final CommitInfo result) {
 114                 LOG.trace("Transaction committed with {}", result);
 115             }
 116
 117             @Override
 118             public void onFailure(final Throwable cause) {
 119                 // Handled by transaction chain listener
 120             }
 121         }, MoreExecutors.directExecutor());
 122     }
 123 }