/**
* This evenement describe the structure of a table.
* It's send before a change append on a table.
* A end user of the lib should have no usage of this
*
* @return TableMapDTO
* @throws BinaryDataReaderException
* @throws ConfigException
*/
public function makeTableMapDTO()
{
$data = [];
$data['table_id'] = $this->binaryDataReader->readTableId();
$this->binaryDataReader->advance(2);
$data['schema_length'] = $this->binaryDataReader->readUInt8();
$data['schema_name'] = $this->binaryDataReader->read($data['schema_length']);
if ([] !== $this->config->getDatabasesOnly() && !in_array($data['schema_name'], $this->config->getDatabasesOnly(), true)) {
return null;
}
$this->binaryDataReader->advance(1);
$data['table_length'] = $this->binaryDataReader->readUInt8();
$data['table_name'] = $this->binaryDataReader->read($data['table_length']);
if ([] !== $this->config->getTablesOnly() && !in_array($data['table_name'], $this->config->getTablesOnly(), true)) {
return null;
}
$this->binaryDataReader->advance(1);
$data['columns_amount'] = $this->binaryDataReader->readCodedBinary();
$data['column_types'] = $this->binaryDataReader->read($data['columns_amount']);
// automatically clear table cache to save memory
if (count(self::$tableMapCache) > $this->config->getTableCacheSize()) {
self::$tableMapCache = array_slice(self::$tableMapCache, ceil($this->config->getTableCacheSize() / 2), null, true);
}
// already in cache don't parse
if (isset(self::$tableMapCache[$data['table_id']])) {
return new TableMapDTO($this->eventInfo, self::$tableMapCache[$data['table_id']]);
}
$this->binaryDataReader->readCodedBinary();
$columns = $this->repository->getFields($data['schema_name'], $data['table_name']);
$fields = [];
// if you drop tables and parse of logs you will get empty scheme
if (!empty($columns)) {
$columnLength = strlen($data['column_types']);
for ($i = 0; $i < $columnLength; $i++) {
// this a dirty hack to prevent row events containing columns which have been dropped
if (!isset($columns[$i])) {
$columns[$i] = ['COLUMN_NAME' => 'DROPPED_COLUMN_' . $i, 'COLLATION_NAME' => null, 'CHARACTER_SET_NAME' => null, 'COLUMN_COMMENT' => null, 'COLUMN_TYPE' => 'BLOB', 'COLUMN_KEY' => '', 'REFERENCED_TABLE_NAME' => '', 'REFERENCED_COLUMN_NAME' => ''];
$type = ConstFieldType::IGNORE;
} else {
$type = ord($data['column_types'][$i]);
}
$fields[$i] = Columns::parse($type, $columns[$i], $this->binaryDataReader);
}
}
// save to cache
self::$tableMapCache[$data['table_id']] = new TableMap($data['schema_name'], $data['table_name'], $data['table_id'], $data['columns_amount'], $fields);
return new TableMapDTO($this->eventInfo, self::$tableMapCache[$data['table_id']]);
}
