/// <summary>
/// Adds a gtid value to the GtidSet.
/// </summary>
public bool AddGtid(IGtid value)
{
var gtid = (Gtid)value;
UuidSet uuidSet;
if (!UuidSets.TryGetValue(gtid.SourceId, out uuidSet))
{
uuidSet = new UuidSet(gtid.SourceId, new List <Interval>());
UuidSets[gtid.SourceId] = uuidSet;
}
return(uuidSet.AddGtid(gtid));
}
/// <summary>
/// Replicates binlog events from the server
/// </summary>
/// <param name="handleEvent">Client callback function</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <returns>Task completed when last event is read in non-blocking mode</returns>
public async Task ReplicateAsync(Func <IBinlogEvent, Task> handleEvent, CancellationToken cancellationToken = default)
{
await ConnectAsync(cancellationToken);
// Clear on reconnect
_gtid = null;
_transaction = false;
await AdjustStartingPosition(cancellationToken);
await SetMasterHeartbeat(cancellationToken);
await SetMasterBinlogChecksum(cancellationToken);
await _databaseProvider.DumpBinlogAsync(_channel, _options, cancellationToken);
await ReadEventStreamAsync(handleEvent, cancellationToken);
}
/// <summary>
/// Adds a gtid value to the GtidList.
/// </summary>
public bool AddGtid(IGtid gtidRaw)
{
var gtid = (Gtid)gtidRaw;
for (int i = 0; i < Gtids.Count; i++)
{
if (Gtids[i].DomainId == gtid.DomainId)
{
Gtids[i] = gtid;
return(false);
}
}
Gtids.Add(gtid);
return(true);
}
/// <summary>
/// Replicates binlog events from the server
/// </summary>
/// <param name="cancellationToken">Cancellation token</param>
/// <returns>Task completed when last event is read in non-blocking mode</returns>
public async IAsyncEnumerable <IBinlogEvent> Replicate([EnumeratorCancellation] CancellationToken cancellationToken = default)
{
await ConnectAsync(cancellationToken);
// Clear on reconnect
_gtid = null;
_transaction = false;
await AdjustStartingPosition(cancellationToken);
await SetMasterHeartbeat(cancellationToken);
await SetMasterBinlogChecksum(cancellationToken);
await _databaseProvider.DumpBinlogAsync(_channel, _options, cancellationToken);
var eventStreamReader = new EventStreamReader(_databaseProvider.Deserializer);
var channel = new EventStreamChannel(eventStreamReader, _channel.Stream);
var timeout = _options.HeartbeatInterval.Add(TimeSpan.FromMilliseconds(TimeoutConstants.Delta));
await foreach (var packet in channel.ReadPacketAsync(timeout, cancellationToken).WithCancellation(cancellationToken))
{
if (packet is IBinlogEvent binlogEvent)
{
// We stop replication if client code throws an exception
// As a derived database may end up in an inconsistent state.
yield return(binlogEvent);
// Commit replication state if there is no exception.
UpdateGtidPosition(binlogEvent);
UpdateBinlogPosition(binlogEvent);
}
else if (packet is EndOfFilePacket && !_options.Blocking)
{
yield break;
}
else if (packet is ErrorPacket error)
{
throw new InvalidOperationException($"Event stream error. {error.ToString()}");
}
else
{
throw new InvalidOperationException($"Event stream unexpected error.");
}
}
}
private void UpdateGtidPosition(IBinlogEvent binlogEvent)
{
if (_options.Binlog.StartingStrategy != StartingStrategy.FromGtid)
{
return;
}
if (binlogEvent is GtidEvent gtidEvent)
{
_gtid = gtidEvent.Gtid;
}
else if (binlogEvent is XidEvent xidEvent)
{
CommitGtid();
}
else if (binlogEvent is QueryEvent queryEvent)
{
if (string.IsNullOrWhiteSpace(queryEvent.SqlStatement))
{
return;
}
if (queryEvent.SqlStatement == "BEGIN")
{
_transaction = true;
}
else if (queryEvent.SqlStatement == "COMMIT" || queryEvent.SqlStatement == "ROLLBACK")
{
CommitGtid();
}
else if (!_transaction)
{
// Auto-commit query like DDL
CommitGtid();
}
}
}
/// <summary>
/// Creates a new <see cref="GtidEvent"/>.
/// </summary>
public GtidEvent(EventHeader header, IGtid gtid, int flags) : base(header)
{
Gtid = gtid;
Flags = flags;
}