private static async Task PrintEventAsync(IBinlogEvent binlogEvent)
{
var json = JsonConvert.SerializeObject(binlogEvent, Formatting.Indented,
new JsonSerializerSettings()
{
Converters = new List <JsonConverter> {
new StringEnumConverter()
}
});
await Console.Out.WriteLineAsync(json);
}
private void UpdateBinlogPosition(IBinlogEvent binlogEvent)
{
// Rows event depends on preceding TableMapEvent & we change the position
// after we read them atomically to prevent missing mapping on reconnect.
// Figure out something better as TableMapEvent can be followed by several row events.
if (binlogEvent is TableMapEvent tableMapEvent)
{
return;
}
if (binlogEvent is RotateEvent rotateEvent)
{
_options.Binlog.Filename = rotateEvent.BinlogFilename;
_options.Binlog.Position = rotateEvent.BinlogPosition;
}
else if (binlogEvent.Header.NextEventPosition > 0)
{
_options.Binlog.Position = binlogEvent.Header.NextEventPosition;
}
}
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>
/// Constructs a <see cref="IBinlogEvent"/> from packet buffer.
/// </summary>
public virtual IBinlogEvent DeserializeEvent(ref PacketReader reader)
{
var eventHeader = new EventHeader(ref reader);
// Consider verifying checksum
// ChecksumType.Verify(eventBuffer, checksumBuffer);
reader.SliceFromEnd(ChecksumStrategy.Length);
IBinlogEvent binlogEvent = null;
if (EventParsers.TryGetValue(eventHeader.EventType, out var eventParser))
{
binlogEvent = eventParser.ParseEvent(eventHeader, ref reader);
}
else
{
binlogEvent = new UnknownEvent(eventHeader);
}
if (binlogEvent is FormatDescriptionEvent formatEvent)
{
ChecksumStrategy = formatEvent.ChecksumType switch
{
ChecksumType.NONE => new NoneChecksum(),
ChecksumType.CRC32 => new Crc32Checksum(),
_ => throw new InvalidOperationException("The master checksum type is not supported.")
};
}
if (binlogEvent is TableMapEvent tableMapEvent)
{
TableMapCache[tableMapEvent.TableId] = tableMapEvent;
}
return(binlogEvent);
}
}
