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<?php
/**
* Table Checksums Class.
*
* @package automattic/jetpack-sync
*/
namespace Automattic\Jetpack\Sync\Replicastore;
/**
* Class to handle Table Checksums for the Users table.
*/
class Table_Checksum_Users extends Table_Checksum {
/**
* Returns the checksum query. All validation of fields and configurations are expected to occur prior to usage.
*
* @param int|null $range_from The start of the range.
* @param int|null $range_to The end of the range.
* @param array|null $filter_values Additional filter values. Not used at the moment.
* @param bool $granular_result If the function should return a granular result.
*
* @return string
*
* @throws Exception Throws an exception if validation fails in the internal function calls.
*/
protected function build_checksum_query( $range_from = null, $range_to = null, $filter_values = null, $granular_result = false ) {
global $wpdb;
// Escape the salt.
$salt = $wpdb->prepare( '%s', $this->salt );
// Prepare the compound key.
$key_fields = array();
// Prefix the fields with the table name, to avoid clashes in queries with sub-queries (e.g. meta tables).
foreach ( $this->key_fields as $field ) {
$key_fields[] = $this->table . '.' . $field;
}
$key_fields = implode( ',', $key_fields );
// Prepare the checksum fields.
$checksum_fields = array();
// Prefix the fields with the table name, to avoid clashes in queries with sub-queries (e.g. meta tables).
foreach ( $this->checksum_fields as $field ) {
$checksum_fields[] = $this->table . '.' . $field;
}
// Apply latin1 conversion if enabled.
if ( $this->perform_text_conversion ) {
// Convert text fields to allow for encoding discrepancies as WP.com is latin1.
foreach ( $this->checksum_text_fields as $field ) {
$checksum_fields[] = 'CONVERT(' . $this->table . '.' . $field . ' using latin1 )';
}
} else {
// Conversion disabled, default to table prefixing.
foreach ( $this->checksum_text_fields as $field ) {
$checksum_fields[] = $this->table . '.' . $field;
}
}
$checksum_fields_string = implode( ',', array_merge( $checksum_fields, array( $salt ) ) );
$additional_fields = '';
if ( $granular_result ) {
// TODO uniq the fields as sometimes(most) range_index is the key and there's no need to select the same field twice.
$additional_fields = "
{$this->table}.{$this->range_field} as range_index,
{$key_fields},
";
}
$filter_stamenet = $this->build_filter_statement( $range_from, $range_to, $filter_values );
// usermeta join to limit on user_level.
$join_statement = "JOIN {$wpdb->usermeta} as um_table ON um_table.user_id = {$this->table}.ID";
$query = "
SELECT
{$additional_fields}
SUM(
CRC32(
CONCAT_WS( '#', {$salt}, {$checksum_fields_string} )
)
) AS checksum
FROM
{$this->table}
{$join_statement}
WHERE
{$filter_stamenet}
AND um_table.meta_key = '{$wpdb->prefix}user_level'
AND um_table.meta_value > 0
";
/**
* We need the GROUP BY only for compound keys.
*/
if ( $granular_result ) {
$query .= "
GROUP BY {$key_fields}
LIMIT 9999999
";
}
return $query;
}
/**
* Obtain the min-max values (edges) of the range.
*
* @param int|null $range_from The start of the range.
* @param int|null $range_to The end of the range.
* @param int|null $limit How many values to return.
*
* @return array|object|void
* @throws Exception Throws an exception if validation fails on the internal function calls.
*/
public function get_range_edges( $range_from = null, $range_to = null, $limit = null ) {
global $wpdb;
$this->validate_fields( array( $this->range_field ) );
// `trim()` to make sure we don't add the statement if it's empty.
$filters = trim( $this->build_filter_statement( $range_from, $range_to ) );
$filter_statement = '';
if ( ! empty( $filters ) ) {
$filter_statement = "
JOIN {$wpdb->usermeta} as um_table ON um_table.user_id = {$this->table}.ID
WHERE
{$filters}
AND um_table.meta_key = '{$wpdb->prefix}user_level'
AND um_table.meta_value > 0
";
}
$query = "
SELECT
MIN({$this->range_field}) as min_range,
MAX({$this->range_field}) as max_range,
COUNT( {$this->range_field} ) as item_count
FROM
";
/**
* If `$limit` is not specified, we can directly use the table.
*/
if ( ! $limit ) {
$query .= "
{$this->table}
{$filter_statement}
";
} else {
/**
* If there is `$limit` specified, we can't directly use `MIN/MAX()` as they don't work with `LIMIT`.
* That's why we will alter the query for this case.
*/
$limit = intval( $limit );
$query .= "
(
SELECT
{$this->range_field}
FROM
{$this->table}
{$filter_statement}
ORDER BY
{$this->range_field} ASC
LIMIT {$limit}
) as ids_query
";
}
// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$result = $wpdb->get_row( $query, ARRAY_A );
if ( ! $result || ! is_array( $result ) ) {
throw new Exception( 'Unable to get range edges' );
}
return $result;
}
}
|
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