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TxPullRequestHandler.java
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TxPullRequestHandler.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.catchup.tx;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import java.io.IOException;
import java.util.function.BooleanSupplier;
import java.util.function.Supplier;
import org.neo4j.causalclustering.catchup.CatchupResult;
import org.neo4j.causalclustering.catchup.CatchupServerProtocol;
import org.neo4j.causalclustering.catchup.CatchupServerProtocol.State;
import org.neo4j.causalclustering.catchup.ResponseMessageType;
import org.neo4j.causalclustering.identity.StoreId;
import org.neo4j.cursor.IOCursor;
import org.neo4j.graphdb.DependencyResolver;
import org.neo4j.kernel.NeoStoreDataSource;
import org.neo4j.kernel.impl.transaction.CommittedTransactionRepresentation;
import org.neo4j.kernel.impl.transaction.log.LogicalTransactionStore;
import org.neo4j.kernel.impl.transaction.log.NoSuchTransactionException;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static java.lang.String.format;
import static org.neo4j.causalclustering.catchup.CatchupResult.E_INVALID_REQUEST;
import static org.neo4j.causalclustering.catchup.CatchupResult.E_STORE_ID_MISMATCH;
import static org.neo4j.causalclustering.catchup.CatchupResult.E_STORE_UNAVAILABLE;
import static org.neo4j.causalclustering.catchup.CatchupResult.E_TRANSACTION_PRUNED;
import static org.neo4j.causalclustering.catchup.CatchupResult.SUCCESS_END_OF_STREAM;
public class TxPullRequestHandler extends SimpleChannelInboundHandler<TxPullRequest>
{
private final CatchupServerProtocol protocol;
private final Supplier<StoreId> storeIdSupplier;
private final BooleanSupplier databaseAvailable;
private final TransactionIdStore transactionIdStore;
private final LogicalTransactionStore logicalTransactionStore;
private final TxPullRequestsMonitor monitor;
private final Log log;
public TxPullRequestHandler( CatchupServerProtocol protocol, Supplier<StoreId> storeIdSupplier,
BooleanSupplier databaseAvailable, Supplier<NeoStoreDataSource> dataSourceSupplier, Monitors monitors, LogProvider logProvider )
{
this.protocol = protocol;
this.storeIdSupplier = storeIdSupplier;
this.databaseAvailable = databaseAvailable;
DependencyResolver dependencies = dataSourceSupplier.get().getDependencyResolver();
this.transactionIdStore = dependencies.resolveDependency( TransactionIdStore.class );
this.logicalTransactionStore = dependencies.resolveDependency( LogicalTransactionStore.class );
this.monitor = monitors.newMonitor( TxPullRequestsMonitor.class );
this.log = logProvider.getLog( getClass() );
}
@Override
protected void channelRead0( ChannelHandlerContext ctx, final TxPullRequest msg ) throws Exception
{
monitor.increment();
if ( msg.previousTxId() <= 0 )
{
log.error( "Illegal tx pull request" );
endInteraction( ctx, E_INVALID_REQUEST, -1 );
return;
}
StoreId localStoreId = storeIdSupplier.get();
StoreId expectedStoreId = msg.expectedStoreId();
long firstTxId = msg.previousTxId() + 1;
IOCursor<CommittedTransactionRepresentation> txCursor = getCursor( ctx, firstTxId, localStoreId, expectedStoreId );
if ( txCursor != null )
{
ChunkedTransactionStream txStream = new ChunkedTransactionStream( localStoreId, firstTxId, txCursor, protocol );
// chunked transaction stream ends the interaction internally and closes the cursor
ctx.writeAndFlush( txStream ).addListener( f ->
{
if ( log.isDebugEnabled() || !f.isSuccess() )
{
String message = format( "Streamed transactions [%d--%d] to %s", firstTxId, txStream.lastTxId(), ctx.channel().remoteAddress() );
if ( f.isSuccess() )
{
log.debug( message );
}
else
{
log.warn( message, f.cause() );
}
}
} );
}
}
private IOCursor<CommittedTransactionRepresentation> getCursor( ChannelHandlerContext ctx, long firstTxId,
StoreId localStoreId, StoreId expectedStoreId ) throws IOException
{
long lastCommittedTransactionId = transactionIdStore.getLastCommittedTransactionId();
if ( localStoreId == null || !localStoreId.equals( expectedStoreId ) )
{
log.info( "Failed to serve TxPullRequest for tx %d and storeId %s because that storeId is different " +
"from this machine with %s", firstTxId, expectedStoreId, localStoreId );
endInteraction( ctx, E_STORE_ID_MISMATCH, lastCommittedTransactionId );
return null;
}
else if ( !databaseAvailable.getAsBoolean() )
{
log.info( "Failed to serve TxPullRequest for tx %d because the local database is unavailable.", firstTxId );
endInteraction( ctx, E_STORE_UNAVAILABLE, lastCommittedTransactionId );
return null;
}
else if ( lastCommittedTransactionId < firstTxId )
{
endInteraction( ctx, SUCCESS_END_OF_STREAM, lastCommittedTransactionId );
return null;
}
try
{
return logicalTransactionStore.getTransactions( firstTxId );
}
catch ( NoSuchTransactionException e )
{
log.info( "Failed to serve TxPullRequest for tx %d because the transaction does not exist.", firstTxId );
endInteraction( ctx, E_TRANSACTION_PRUNED, lastCommittedTransactionId );
return null;
}
}
private void endInteraction( ChannelHandlerContext ctx, CatchupResult status, long lastCommittedTransactionId )
{
ctx.write( ResponseMessageType.TX_STREAM_FINISHED );
ctx.writeAndFlush( new TxStreamFinishedResponse( status, lastCommittedTransactionId ) );
protocol.expect( State.MESSAGE_TYPE );
}
}