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