protected internal override void DecodeBody(ref SequenceReader <byte> reader, object context)
{
TableID = reader.ReadLong(6);
reader.TryReadLittleEndian(out short flags);
reader.TryReadLittleEndian(out short extraDataLen);
reader.Advance(extraDataLen);
IncludedColumnsBeforeUpdate = reader.ReadBitArray((int)reader.ReadLengthEncodedInteger());
IncludedColumns = reader.ReadBitArray((int)reader.ReadLengthEncodedInteger());
TableMapEvent tableMap = null;
if (context is ReplicationState repState)
{
repState.TableMap.TryGetValue(TableID, out tableMap);
}
if (tableMap == null)
{
throw new Exception($"The table's metadata was not found: {TableID}.");
}
Rows = ReadUpdatedRows(ref reader, tableMap, IncludedColumnsBeforeUpdate, IncludedColumns);
}
protected override void ReadIncludedColumns(ref SequenceReader <byte> reader)
{
var columnCount = (int)reader.ReadLengthEncodedInteger();
IncludedColumnsBeforeUpdate = reader.ReadBitArray(columnCount);
IncludedColumns = reader.ReadBitArray(columnCount);
}
protected internal override void DecodeBody(ref SequenceReader <byte> reader, object context)
{
TableID = reader.ReadLong(6);
reader.Advance(2); // skip flags
byte len;
reader.TryRead(out len);
SchemaName = reader.ReadString(len);
reader.TryRead(out len);
TableName = reader.ReadString(len);
ColumnCount = (int)reader.ReadLengthEncodedInteger();
ColumnTypes = reader.Sequence.Slice(reader.Consumed, ColumnCount).ToArray();
reader.Advance(ColumnCount);
reader.ReadLengthEncodedInteger();
ColumnMetadata = ReadColumnMetadata(ref reader, ColumnTypes);
NullBitmap = reader.ReadBitArray(ColumnCount);
Metadata = ReadTableMetadata(ref reader);
if (context is ReplicationState repState)
{
repState.TableMap[TableID] = this;
}
}
private void ReadMetadataField(ref SequenceReader <byte> subReader, MetadataFieldType fieldType, TableMetadata metadata, int numericColumnCount)
{
switch (fieldType)
{
case MetadataFieldType.SIGNEDNESS:
metadata.Signedness = subReader.ReadBitArray(numericColumnCount);
break;
case MetadataFieldType.DEFAULT_CHARSET:
metadata.DefaultCharset = ReadDefaultCharset(ref subReader);
break;
case MetadataFieldType.COLUMN_CHARSET:
metadata.ColumnCharsets = ReadIntegers(ref subReader);
break;
case MetadataFieldType.COLUMN_NAME:
metadata.ColumnNames = ReadStringList(ref subReader);
break;
case MetadataFieldType.SET_STR_VALUE:
metadata.SetStrValues = ReadTypeValues(ref subReader);
break;
case MetadataFieldType.ENUM_STR_VALUE:
metadata.EnumStrValues = ReadTypeValues(ref subReader);
break;
case MetadataFieldType.GEOMETRY_TYPE:
metadata.GeometryTypes = ReadIntegers(ref subReader);
break;
case MetadataFieldType.SIMPLE_PRIMARY_KEY:
metadata.SimplePrimaryKeys = ReadIntegers(ref subReader);
break;
case MetadataFieldType.PRIMARY_KEY_WITH_PREFIX:
metadata.PrimaryKeysWithPrefix = ReadIntegerDictionary(ref subReader);
break;
case MetadataFieldType.ENUM_AND_SET_DEFAULT_CHARSET:
metadata.EnumAndSetDefaultCharset = ReadDefaultCharset(ref subReader);
break;
case MetadataFieldType.ENUM_AND_SET_COLUMN_CHARSET:
metadata.EnumAndSetColumnCharsets = ReadIntegers(ref subReader);
break;
default:
throw new Exception("Unsupported table metadata field type: " + fieldType);
}
}
public object ReadValue(ref SequenceReader <byte> reader, int meta)
{
int bitArrayLength = (meta >> 8) * 8 + (meta & 0xFF);
return(reader.ReadBitArray(bitArrayLength, false));
}
protected object[] ReadRow(ref SequenceReader <byte> reader, TableMapEvent table, BitArray includedColumns, int columnCount)
{
var cells = new object[columnCount];
var nullColumns = reader.ReadBitArray(columnCount, true);
var columnTypes = table.ColumnTypes;
var columnMetadata = table.ColumnMetadata;
for (int i = 0, numberOfSkippedColumns = 0; i < columnTypes.Length; i++)
{
if (!includedColumns.Get(i))
{
numberOfSkippedColumns++;
continue;
}
int index = i - numberOfSkippedColumns;
if (nullColumns.Get(index))
{
continue;
}
var typeCode = columnTypes[i];
var meta = columnMetadata[i];
var length = 0;
var columnType = (ColumnType)typeCode;
if (columnType == ColumnType.STRING)
{
if (meta >= 256)
{
int meta0 = meta >> 8, meta1 = meta & 0xFF;
if ((meta0 & 0x30) != 0x30)
{
typeCode = (byte)(meta0 | 0x30);
columnType = (ColumnType)typeCode;
length = meta1 | (((meta0 & 0x30) ^ 0x30) << 4);
}
else
{
// mysql-5.6.24 sql/rpl_utility.h enum_field_types (line 278)
if (meta0 == (int)ColumnType.ENUM || meta0 == (int)ColumnType.SET)
{
typeCode = (byte)meta0;
columnType = (ColumnType)typeCode;
}
length = meta1;
}
}
else
{
length = meta;
}
}
cells[index] = ReadCell(ref reader, columnType, meta, length);
}
return(cells);
}
protected virtual void ReadIncludedColumns(ref SequenceReader <byte> reader)
{
IncludedColumns = reader.ReadBitArray((int)reader.ReadLengthEncodedInteger());
}
private TableMetadata ReadTableMetadata(ref SequenceReader <byte> reader)
{
var numericColumnCount = ColumnTypes.Count(c => IsNumberColumn((ColumnType)c));
var metadata = new TableMetadata();
while (reader.Remaining > 0)
{
reader.TryRead(out byte filedTypeCode);
var fieldType = (MetadataFieldType)filedTypeCode;
switch (fieldType)
{
case MetadataFieldType.SIGNEDNESS:
metadata.Signedness = reader.ReadBitArray(numericColumnCount);
break;
case MetadataFieldType.DEFAULT_CHARSET:
metadata.DefaultCharset = ReadDefaultCharset(ref reader);
break;
case MetadataFieldType.COLUMN_CHARSET:
metadata.ColumnCharsets = ReadIntegers(ref reader);
break;
case MetadataFieldType.COLUMN_NAME:
metadata.ColumnNames = ReadStringList(ref reader);
break;
case MetadataFieldType.SET_STR_VALUE:
metadata.SetStrValues = ReadTypeValues(ref reader);
break;
case MetadataFieldType.ENUM_STR_VALUE:
metadata.EnumStrValues = ReadTypeValues(ref reader);
break;
case MetadataFieldType.GEOMETRY_TYPE:
metadata.GeometryTypes = ReadIntegers(ref reader);
break;
case MetadataFieldType.SIMPLE_PRIMARY_KEY:
metadata.SimplePrimaryKeys = ReadIntegers(ref reader);
break;
case MetadataFieldType.PRIMARY_KEY_WITH_PREFIX:
metadata.PrimaryKeysWithPrefix = ReadIntegerDictionary(ref reader);
break;
case MetadataFieldType.ENUM_AND_SET_DEFAULT_CHARSET:
metadata.EnumAndSetDefaultCharset = ReadDefaultCharset(ref reader);
break;
case MetadataFieldType.ENUM_AND_SET_COLUMN_CHARSET:
metadata.EnumAndSetColumnCharsets = ReadIntegers(ref reader);
break;
default:
throw new Exception("Unsupported table metadata field type: " + fieldType);
}
}
return(metadata);
}