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db.php
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<?php
/*
Plugin Name: HyperDB
Plugin URI: https://wordpress.org/plugins/hyperdb/
Description: An advanced database class that supports replication, failover, load balancing, and partitioning.
Author: Automattic
License: GPLv2 or later
Version: 1.9
*/
// phpcs:disable Squiz.PHP.CommentedOutCode.Found
/** This file should be installed at ABSPATH/wp-content/db.php **/
/**
* @var wpdb|true
* @psalm-suppress InvalidGlobal
*/
global $wpdb;
/** Load the wpdb class while preventing instantiation **/
$wpdb = true; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
if ( defined( 'WPDB_PATH' ) ) {
/** @psalm-suppress UnresolvableInclude */
require_once WPDB_PATH;
} elseif ( file_exists( ABSPATH . WPINC . '/class-wpdb.php' ) ) {
// WP 6.1 and later.
/** @psalm-suppress UnresolvableInclude */
require_once ABSPATH . WPINC . '/class-wpdb.php';
} else {
// WP 6.0 and earlier.
/** @psalm-suppress UnresolvableInclude */
require_once ABSPATH . WPINC . '/wp-db.php';
}
// phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedIf
if ( defined( 'DB_CONFIG_FILE' ) && file_exists( DB_CONFIG_FILE ) ) {
/** The config file was defined earlier. **/
} elseif ( file_exists( ABSPATH . 'db-config.php' ) ) {
/** The config file resides in ABSPATH. **/
define( 'DB_CONFIG_FILE', ABSPATH . 'db-config.php' );
} elseif ( file_exists( dirname( ABSPATH ) . '/db-config.php' ) && ! file_exists( dirname( ABSPATH ) . '/wp-settings.php' ) ) {
/** The config file resides one level above ABSPATH but is not part of another install. **/
define( 'DB_CONFIG_FILE', dirname( ABSPATH ) . '/db-config.php' );
} else {
/** Lacking a config file, revert to the standard database class. **/
$wpdb = new wpdb( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST ); // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
return;
}
/**
* Common definitions
*/
define( 'HYPERDB_LAG_OK', 1 );
define( 'HYPERDB_LAG_BEHIND', 2 );
define( 'HYPERDB_LAG_UNKNOWN', 3 );
define( 'HYPERDB_ER_OPTION_PREVENTS_STATEMENT', 1290 ); // The MySQL server is running with the %s option so it cannot execute this statement
define( 'HYPERDB_CONNNECTION_ERROR', 2002 ); // Can't connect to local MySQL server through socket '%s' (%d)
define( 'HYPERDB_CONN_HOST_ERROR', 2003 ); // Can't connect to MySQL server on '%s' (%d)
define( 'HYPERDB_SERVER_GONE_ERROR', 2006 ); // MySQL server has gone away
// phpcs:ignore PEAR.NamingConventions.ValidClassName.StartWithCapital
class hyperdb extends wpdb {
/**
* The last table that was queried
* @var string
*/
public $last_table;
/**
* After any SQL_CALC_FOUND_ROWS query, the query "SELECT FOUND_ROWS()"
* is sent and the mysql result resource stored here. The next query
* for FOUND_ROWS() will retrieve this. We do this to prevent any
* intervening queries from making FOUND_ROWS() inaccessible. You may
* prevent this by adding "NO_SELECT_FOUND_ROWS" in a comment.
* @var resource
*/
public $last_found_rows_result;
/**
* Whether to store queries in an array. Useful for debugging and profiling.
* @var bool
*/
public $save_queries = false;
/**
* The current mysql link resource
* @var mysqli|resource|false|null
*/
protected $dbh;
/**
* Associative array (dbhname => dbh) for established mysql connections
* @var array
*/
public $dbhs;
/**
* The multi-dimensional array of datasets and servers
* @var array
*/
public $hyper_servers = array();
/**
* Optional directory of tables and their datasets
* @var array
*/
public $hyper_tables = array();
/**
* Optional directory of callbacks to determine datasets from queries
* @var array
*/
public $hyper_callbacks = array();
/**
* Custom callback to save debug info in $this->queries
* @var callable
*/
public $save_query_callback = null;
/**
* Whether to use persistent connections
* @var bool
*/
public $persistent = false;
/**
* The maximum number of db links to keep open. The least-recently used
* link will be closed when the number of links exceeds this.
* @var int
*/
public $max_connections = 10;
/**
* Whether to check with fsockopen prior to connecting to mysql.
* @var bool
*/
public $check_tcp_responsiveness = true;
/**
* Minimum number of connections to try before bailing
* @var int
*/
public $min_tries = 3;
/**
* Send Reads To Masters. This disables slave connections while true.
* Otherwise it is an array of written tables.
* @var array
*/
public $srtm = array();
/**
* The log of db connections made and the time each one took
* @var array
*/
public $db_connections = array();
/**
* The list of unclosed connections sorted by LRU
*/
public $open_connections = array();
/**
* The last server used and the database name selected
* @var array
*/
public $last_used_server;
/**
* Lookup array (dbhname => (server, db name) ) for re-selecting the db
* when a link is re-used.
* @var array
*/
public $used_servers = array();
/**
* Lookup array (dbhname => int) of the number of unique servers in the config
* @var array
*/
public $unique_servers = array();
/**
* A list of servers we found to be read-only
* @var array
*/
public $read_only_servers = array();
/**
* A list of servers' state
* @var array
*/
public $servers_state = array();
/**
* Whether to save debug_backtrace in save_query_callback. You may wish
* to disable this, e.g. when tracing out-of-memory problems.
*/
public $save_backtrace = true;
/**
* Maximum lag in seconds. Set null to disable. Requires callbacks.
* @var integer
*/
public $default_lag_threshold = null;
/**
* Lookup array (dbhname => host:port)
* @var array
*/
public $dbh2host = array();
/**
* Keeps track of the dbhname usage and errors.
*/
public $dbhname_heartbeats = array();
/**
* Counter for how many queries have failed during the life of the $wpdb object
*/
public $num_failed_queries = 0;
/**
* Gets ready to make database connections
* @param array db class vars
*/
public function __construct( $args = null ) {
if ( is_array( $args ) ) {
foreach ( get_class_vars( __CLASS__ ) as $var => $value ) {
if ( isset( $args[ $var ] ) ) {
$this->$var = $args[ $var ];
}
}
}
$this->use_mysqli = $this->should_use_mysqli();
if ( $this->use_mysqli ) {
mysqli_report( MYSQLI_REPORT_OFF );
}
$this->init_charset();
}
/**
* Add the connection parameters for a database
*/
public function add_database( $db ) {
extract( $db, EXTR_SKIP );
if ( ! isset( $dataset ) ) {
$dataset = 'global';
}
if ( ! isset( $read ) ) {
$read = 1;
}
if ( ! isset( $write ) ) {
$write = 1;
}
unset( $db['dataset'] );
if ( $read ) {
$this->hyper_servers[ $dataset ]['read'][ $read ][] = $db;
}
if ( $write ) {
$this->hyper_servers[ $dataset ]['write'][ $write ][] = $db;
}
}
/**
* Specify the dateset where a table is found
*/
public function add_table( $dataset, $table ) {
$this->hyper_tables[ $table ] = $dataset;
}
/**
* Add a callback to a group of callbacks.
* The default group is 'dataset', used to examine
* queries and determine dataset.
*/
public function add_callback( $callback, $group = 'dataset' ) {
$this->hyper_callbacks[ $group ][] = $callback;
}
/**
* Find the table to be used for query routing. Falls back on
* core get_table_from_query after checking for special cases.
* @param string query
* @return string table
*/
public function get_table_from_query( $q ) {
// Remove characters that can legally trail the table name
$q = rtrim( $q, ';/-#' );
// allow (select...) union [...] style queries. Use the first queries table name.
$q = ltrim( $q, "\t (" );
// Strip everything between parentheses except nested
// selects and use only 1500 chars of the query
$q = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', substr( $q, 0, 1500 ) );
// SELECT FOUND_ROWS() refers to the previous SELECT query
if ( preg_match( '/^\s*SELECT.*?\s+FOUND_ROWS\(\)/is', $q ) ) {
return $this->last_table;
}
// SELECT FROM information_schema.* WHERE TABLE_NAME = 'wp_12345_foo'
if ( preg_match('/^\s*'
. 'SELECT.*?\s+FROM\s+`?information_schema`?\.'
. '.*\s+TABLE_NAME\s*=\s*["\']([\w-]+)["\']/is', $q, $maybe) ) {
return $maybe[1];
}
// Transaction support, requires a table hint via comment: IN_TABLE=table_name
if ( preg_match('/^\s*'
. '(?:START\s+TRANSACTION|COMMIT|ROLLBACK)\s*\/[*]\s*IN_TABLE\s*=\s*'
. "'?([\w-]+)'?/is", $q, $maybe) ) {
return $maybe[1];
}
$this->last_table = parent::get_table_from_query( $q );
return $this->last_table;
}
/**
* Determine the likelihood that this query could alter anything
* @param string query
* @return bool
*/
public function is_write_query( $q ) {
// Quick and dirty: only SELECT statements are considered read-only.
$q = ltrim( $q, "\r\n\t (" );
return ! preg_match( '/^(?:SELECT|SHOW|DESCRIBE|DESC|EXPLAIN)\s/i', $q );
}
/**
* Set a flag to prevent reading from slaves which might be lagging after a write
*/
public function send_reads_to_masters() {
$this->srtm = true;
}
/**
* Callbacks are executed in the order in which they are registered until one
* of them returns something other than null.
*/
public function run_callbacks( $group, $args = null ) {
if ( ! isset( $this->hyper_callbacks[ $group ] ) || ! is_array( $this->hyper_callbacks[ $group ] ) ) {
return null;
}
if ( ! isset( $args ) ) {
$args = array( $this );
} elseif ( is_array( $args ) ) {
// 8.0+ changed the behavior of call_user_func_array(), associative arrays would turn into named attributes
// Here we discard the keys and hope for the best
$args = array_values( $args );
$args[] = $this;
} else {
$args = array( $args, $this );
}
foreach ( $this->hyper_callbacks[ $group ] as $func ) {
$result = call_user_func_array( $func, $args );
if ( isset( $result ) ) {
return $result;
}
}
}
/**
* Figure out which database server should handle the query, and connect to it.
* @param string query
* @return resource mysql database connection
*/
public function db_connect( $query = '' ) {
if ( empty( $query ) ) {
return false;
}
$this->table = $this->get_table_from_query( $query );
if ( isset( $this->hyper_tables[ $this->table ] ) ) {
$dataset = $this->hyper_tables[ $this->table ];
$this->callback_result = null;
} else {
$this->callback_result = $this->run_callbacks( 'dataset', $query );
if ( null !== $this->callback_result ) {
if ( is_array( $this->callback_result ) ) {
extract( $this->callback_result, EXTR_OVERWRITE );
} else {
$dataset = $this->callback_result;
}
}
}
if ( ! isset( $dataset ) ) {
$dataset = 'global';
}
if ( ! $dataset ) {
return $this->log_and_bail( "Unable to determine dataset (for table: $this->table)" );
} else {
$this->dataset = $dataset;
}
$this->run_callbacks( 'dataset_found', $dataset );
if ( empty( $this->hyper_servers ) ) {
if ( $this->is_mysql_connection( $this->dbh ) ) {
return $this->dbh;
}
if (
! defined( 'DB_HOST' )
|| ! defined( 'DB_USER' )
|| ! defined( 'DB_PASSWORD' )
|| ! defined( 'DB_NAME' ) ) {
return $this->log_and_bail( 'We were unable to query because there was no database defined' );
}
$this->dbh = $this->ex_mysql_connect( DB_HOST, DB_USER, DB_PASSWORD, $this->persistent );
if ( ! $this->is_mysql_connection( $this->dbh ) ) {
return $this->log_and_bail( 'We were unable to connect to the database. (DB_HOST)' );
}
if ( ! $this->ex_mysql_select_db( DB_NAME, $this->dbh ) ) {
return $this->log_and_bail( 'We were unable to select the database' );
}
if ( ! empty( $this->charset ) ) {
$collation_query = "SET NAMES '$this->charset'";
if ( ! empty( $this->collate ) ) {
$collation_query .= " COLLATE '$this->collate'";
}
$this->ex_mysql_query( $collation_query, $this->dbh );
}
return $this->dbh;
}
// Determine whether the query must be sent to the master (a writable server)
if ( ! empty( $use_master ) || true === $this->srtm || isset( $this->srtm[ $this->table ] ) ) {
$use_master = true;
} elseif ( $this->is_write_query( $query ) ) {
$use_master = true;
if ( is_array( $this->srtm ) ) {
$this->srtm[ $this->table ] = true;
}
} elseif ( ! isset( $use_master ) && is_array( $this->srtm ) && ! empty( $this->srtm ) ) {
// Detect queries that have a join in the srtm array.
$use_master = false;
$query_match = substr( $query, 0, 1000 );
foreach ( $this->srtm as $key => $value ) {
if ( false !== stripos( $query_match, $key ) ) {
$use_master = true;
break;
}
}
} else {
$use_master = false;
}
if ( $use_master ) {
$dbhname = $dataset . '__w';
$this->dbhname = $dbhname;
$operation = 'write';
} else {
$dbhname = $dataset . '__r';
$this->dbhname = $dbhname;
$operation = 'read';
}
// Try to reuse an existing connection
while ( isset( $this->dbhs[ $dbhname ] ) && $this->is_mysql_connection( $this->dbhs[ $dbhname ] ) ) {
// Find the connection for incrementing counters
foreach ( array_keys( $this->db_connections ) as $i ) {
if ( $this->db_connections[ $i ]['dbhname'] == $dbhname ) {
$conn =& $this->db_connections[ $i ];
}
}
if ( isset( $server['name'] ) ) {
$name = $server['name'];
// A callback has specified a database name so it's possible the existing connection selected a different one.
if ( $name != $this->used_servers[ $dbhname ]['name'] ) {
if ( ! $this->ex_mysql_select_db( $name, $this->dbhs[ $dbhname ] ) ) {
// this can happen when the user varies and lacks permission on the $name database
if ( isset( $conn['disconnect (select failed)'] ) ) {
++$conn['disconnect (select failed)'];
} else {
$conn['disconnect (select failed)'] = 1;
}
$this->disconnect( $dbhname );
break;
}
$this->used_servers[ $dbhname ]['name'] = $name;
}
} else {
$name = $this->used_servers[ $dbhname ]['name'];
}
$this->current_host = $this->dbh2host[ $dbhname ];
// Keep this connection at the top of the stack to prevent disconnecting frequently-used connections
$k = array_search( $dbhname, $this->open_connections );
if ( $k ) {
unset( $this->open_connections[ $k ] );
$this->open_connections[] = $dbhname;
}
$this->last_used_server = $this->used_servers[ $dbhname ];
$this->last_connection = compact( 'dbhname', 'name' );
if ( $this->should_mysql_ping() && ! $this->ex_mysql_ping( $this->dbhs[ $dbhname ] ) ) {
if ( isset( $conn['disconnect (ping failed)'] ) ) {
++$conn['disconnect (ping failed)'];
} else {
$conn['disconnect (ping failed)'] = 1;
}
$this->disconnect( $dbhname );
break;
}
if ( isset( $conn['queries'] ) ) {
++$conn['queries'];
} else {
$conn['queries'] = 1;
}
return $this->dbhs[ $dbhname ];
}
if ( $use_master && defined( 'MASTER_DB_DEAD' ) ) {
return $this->bail( "We're updating the database, please try back in 5 minutes. If you are posting to your blog please hit the refresh button on your browser in a few minutes to post the data again. It will be posted as soon as the database is back online again." );
}
if ( empty( $this->hyper_servers[ $dataset ][ $operation ] ) ) {
return $this->log_and_bail( "No databases available with $this->table ($dataset)" );
}
// Put the groups in order by priority
ksort( $this->hyper_servers[ $dataset ][ $operation ] );
// Make a list of at least $this->min_tries connections to try, repeating as necessary.
$servers = array();
$this->unique_servers[ $dbhname ] = array();
do {
foreach ( $this->hyper_servers[ $dataset ][ $operation ] as $group => $items ) {
$keys = array_keys( $items );
shuffle( $keys );
foreach ( $keys as $key ) {
$servers[] = compact( 'group', 'key' );
if ( ! isset( $this->unique_servers[ $dbhname ][ $items[ $key ]['host'] ] ) ) {
$this->unique_servers[ $dbhname ][ $items[ $key ]['host'] ] = true;
}
}
}
if ( 0 === count( $this->unique_servers[ $dbhname ] ) ) {
return $this->log_and_bail( "No database servers were found to match the query ($this->table, $dataset)" );
}
} while ( count( $servers ) < $this->min_tries ); // phpcs:ignore Squiz.PHP.DisallowSizeFunctionsInLoops.Found
// Connect to a database server
do {
$unique_lagged_slaves = array();
$unique_readonly_masters = array();
$success = false;
$tries_remaining = count( $servers );
foreach ( $servers as $group_key ) {
--$tries_remaining;
// Variables: $group, $key
extract( $group_key, EXTR_OVERWRITE );
// Variables: $host, $user, $password, $name, $read, $write [, $lag_threshold, $timeout ]
extract( $this->hyper_servers[ $dataset ][ $operation ][ $group ][ $key ], EXTR_OVERWRITE );
$port = null;
// Split host:port into $host and $port
if ( strpos( $host, ':' ) ) {
list($host, $port) = explode( ':', $host );
}
// Overlay $server if it was extracted from a callback
if ( isset( $server ) && is_array( $server ) ) {
extract( $server, EXTR_OVERWRITE );
}
// Split again in case $server had host:port
if ( strpos( $host, ':' ) ) {
list($host, $port) = explode( ':', $host );
}
// Make sure there's always a port number
if ( empty( $port ) ) {
$port = 3306;
}
// Use a default timeout of 200ms
if ( ! isset( $timeout ) ) {
$timeout = 0.2;
}
// Get the minimum group here, in case $server rewrites it
if ( ! isset( $min_group ) || $min_group > $group ) {
$min_group = $group;
}
// If a master is read-only and we have others which might not be RO, go to the next one
if ( $use_master && $this->unique_servers[ $dbhname ] > 1 && empty( $ignore_server_read_only ) ) {
if ( count( $unique_readonly_masters ) == count( $this->unique_servers[ $dbhname ] ) ) {
$ignore_server_read_only = true; // All are read-only, ignore RO and retry
continue 2;
}
if ( $this->is_server_marked_read_only( $host, $port ) ) {
$unique_readonly_masters[ "$host:$port" ] = true;
continue;
}
}
// Can be used by the lag callbacks
$this->lag_cache_key = "$host:$port";
$this->lag_threshold = isset( $lag_threshold ) ? $lag_threshold : $this->default_lag_threshold;
// Check for a lagged slave, if applicable
if ( ! $use_master && ! $write && ! isset( $ignore_slave_lag )
&& isset( $this->lag_threshold ) && ! isset( $server['host'] )
// phpcs:ignore Squiz.PHP.DisallowMultipleAssignments.FoundInControlStructure
&& ( $lagged_status = $this->get_lag_cache() ) === HYPERDB_LAG_BEHIND
) {
// If it is the last lagged slave and it is with the best preference we will ignore its lag
if ( ! isset( $unique_lagged_slaves[ "$host:$port" ] )
&& count( $unique_lagged_slaves ) + 1 == count( $this->unique_servers[ $dbhname ] )
&& $group == $min_group ) {
$this->lag_threshold = null;
} else {
$unique_lagged_slaves[ "$host:$port" ] = $this->lag;
continue;
}
}
$this->timer_start();
// Connect if necessary or possible
$server_state = null;
if ( $use_master || ! $tries_remaining ||
// phpcs:ignore Squiz.PHP.DisallowMultipleAssignments.FoundInControlStructure
'up' === ( $server_state = $this->get_server_state( $host, $port, $dbhname, $timeout ) ) ) {
$this->set_connect_timeout( 'pre_connect', $use_master, $tries_remaining );
$this->dbhs[ $dbhname ] = $this->ex_mysql_connect( "$host:$port", $user, $password, $this->persistent );
$this->set_connect_timeout( 'post_connect', $use_master, $tries_remaining );
} else {
$this->dbhs[ $dbhname ] = false;
}
$elapsed = $this->timer_stop();
if ( $this->is_mysql_connection( $this->dbhs[ $dbhname ] ) ) {
/**
* If we care about lag, disconnect lagged slaves and try to find others.
* We don't disconnect if it is the last lagged slave and it is with the best preference.
*/
if ( ! $use_master && ! $write && ! isset( $ignore_slave_lag )
&& isset( $this->lag_threshold ) && ! isset( $server['host'] )
&& HYPERDB_LAG_OK !== $lagged_status
&& ( $lagged_status = $this->get_lag() ) === HYPERDB_LAG_BEHIND // phpcs:ignore Squiz.PHP.DisallowMultipleAssignments.FoundInControlStructure
&& ! (
! isset( $unique_lagged_slaves[ "$host:$port" ] )
&& count( $unique_lagged_slaves ) + 1 === count( $this->unique_servers[ $dbhname ] )
&& $group == $min_group
)
) {
$success = false;
$unique_lagged_slaves[ "$host:$port" ] = $this->lag;
$this->disconnect( $dbhname );
$this->dbhs[ $dbhname ] = false;
$msg = "Replication lag of {$this->lag}s on $host:$port ($dbhname)";
$this->print_error( $msg );
continue;
} elseif ( $this->ex_mysql_select_db( $name, $this->dbhs[ $dbhname ] ) ) {
$success = true;
$this->current_host = "$host:$port";
$this->dbh2host[ $dbhname ] = "$host:$port";
$queries = 1;
$lag = isset( $this->lag ) ? $this->lag : 0;
$this->last_connection = compact( 'dbhname', 'host', 'port', 'user', 'name', 'server_state', 'elapsed', 'success', 'queries', 'lag' );
$this->db_connections[] = $this->last_connection;
$this->open_connections[] = $dbhname;
break;
}
}
if ( 'down' == $server_state ) {
continue; // don't flood the logs if already down
}
$errno = $this->ex_mysql_errno();
if ( ( HYPERDB_CONN_HOST_ERROR == $errno || HYPERDB_CONNNECTION_ERROR == $errno ) &&
( 'up' == $server_state || ! $tries_remaining ) ) {
$this->mark_server_as_down( $host, $port );
$server_state = 'down';
}
$referrer = '';
if ( ! empty( $_SERVER['HTTP_HOST'] ) ) {
// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- print_error() will sanitize the entire message
$referrer .= (string) $_SERVER['HTTP_HOST'];
}
if ( ! empty( $_SERVER['REQUEST_URI'] ) ) {
// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- print_error() will sanitize the entire message
$referrer .= (string) $_SERVER['REQUEST_URI'];
}
if ( ! isset( $tcp ) ) {
$tcp = '';
}
if ( ! isset( $server ) ) {
$server = '';
}
$success = false;
$this->last_connection = compact( 'dbhname', 'host', 'port', 'user', 'name', 'tcp', 'elapsed', 'success' );
$this->db_connections[] = $this->last_connection;
$msg = date( 'Y-m-d H:i:s' ) . " Can't select $dbhname - \n"; // phpcs:ignore WordPress.DateTime.RestrictedFunctions.date_date
$msg .= "'referrer' => '{$referrer}',\n";
$msg .= "'server' => {$server},\n";
$msg .= "'host' => {$host},\n";
$msg .= "'error' => " . $this->ex_mysql_error() . ",\n";
$msg .= "'errno' => " . $this->ex_mysql_errno() . ",\n";
$msg .= "'server_state' => $server_state\n";
$msg .= "'lagged_status' => " . ( isset( $lagged_status ) ? $lagged_status : HYPERDB_LAG_UNKNOWN );
$this->print_error( $msg );
}
if ( ! $success || ! isset( $this->dbhs[ $dbhname ] ) || ! $this->is_mysql_connection( $this->dbhs[ $dbhname ] ) ) {
if ( ! isset( $ignore_slave_lag ) && count( $unique_lagged_slaves ) ) {
// Lagged slaves were not used. Ignore the lag for this connection attempt and retry.
$ignore_slave_lag = true;
continue;
}
$error_details = array(
'host' => $host,
'port' => $port,
'operation' => $operation,
'table' => $this->table,
'dataset' => $dataset,
'dbhname' => $dbhname,
);
$this->run_callbacks( 'db_connection_error', $error_details );
return $this->bail( "Unable to connect to $host:$port to $operation table '$this->table' ($dataset)" );
}
break;
} while ( true );
if ( ! isset( $charset ) ) {
$charset = null;
}
if ( ! isset( $collate ) ) {
$collate = null;
}
$this->set_charset( $this->dbhs[ $dbhname ], $charset, $collate );
$this->dbh = $this->dbhs[ $dbhname ]; // needed by $wpdb->_real_escape()
$this->last_used_server = compact( 'host', 'user', 'name', 'read', 'write' );
$this->used_servers[ $dbhname ] = $this->last_used_server;
// phpcs:ignore Squiz.PHP.DisallowSizeFunctionsInLoops.Found
while ( ! $this->persistent && count( $this->open_connections ) > $this->max_connections ) {
$oldest_connection = array_shift( $this->open_connections );
if ( $this->dbhs[ $oldest_connection ] != $this->dbhs[ $dbhname ] ) {
$this->disconnect( $oldest_connection );
}
}
return $this->dbhs[ $dbhname ];
}
/**
* Sets the connection's character set.
* @param resource $dbh The resource given by ex_mysql_connect
* @param string $charset The character set (optional)
* @param string $collate The collation (optional)
*/
public function set_charset( $dbh, $charset = null, $collate = null ) {
if ( ! isset( $charset ) ) {
$charset = $this->charset;
}
if ( ! isset( $collate ) ) {
$collate = $this->collate;
}
if ( ! $this->has_cap( 'collation', $dbh ) || empty( $charset ) ) {
return;
}
if ( ! in_array( strtolower( $charset ), array( 'utf8', 'utf8mb4', 'latin1' ) ) ) {
// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
wp_die( sprintf( "%s charset isn't supported in HyperDB for security reasons", htmlspecialchars( $charset ) ) );
}
if ( $this->is_mysql_set_charset_callable() && $this->has_cap( 'set_charset', $dbh ) ) {
$this->ex_mysql_set_charset( $charset, $dbh );
$this->real_escape = true;
} else {
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) ) {
$query .= $this->prepare( ' COLLATE %s', $collate );
}
$this->ex_mysql_query( $query, $dbh );
}
}
/**
* Force addslashes() for the escapes.
*
* HyperDB makes connections when a query is made
* which is why we can't use mysql_real_escape_string() for escapes.
* This is also the reason why we don't allow certain charsets. See set_charset().
*/
public function _real_escape( $string ) { // phpcs:ignore PSR2.Methods.MethodDeclaration.Underscore
$escaped = addslashes( $string );
if ( method_exists( get_parent_class( $this ), 'add_placeholder_escape' ) ) {
$escaped = $this->add_placeholder_escape( $escaped );
}
return $escaped;
}
/**
* Disconnect and remove connection from open connections list
* @param string $tdbhname
*/
public function disconnect( $dbhname ) {
$k = array_search( $dbhname, $this->open_connections );
if ( false !== $k ) {
unset( $this->open_connections[ $k ] );
}
foreach ( array_keys( $this->db_connections ) as $i ) {
if ( $this->db_connections[ $i ]['dbhname'] == $dbhname ) {
unset( $this->db_connections[ $i ] );
}
}
if ( $this->is_mysql_connection( $this->dbhs[ $dbhname ] ) ) {
$this->ex_mysql_close( $this->dbhs[ $dbhname ] );
}
unset( $this->dbhs[ $dbhname ] );
}
/**
* Kill cached query results
*/
public function flush() {
$this->last_error = '';
$this->last_errno = 0;
$this->num_rows = 0;
parent::flush();
}
/**
* Basic query. See docs for more details.
* @param string $query
* @return int number of rows
*/
public function query( $query ) {
// some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
if ( function_exists( 'apply_filters' ) ) {
$query = apply_filters( 'query', $query );
}
// initialise return
$return_val = 0;
$this->flush();
// Log how the function was called
$this->func_call = "\$db->query(\"$query\")";
// Keep track of the last query for debug..
$this->last_query = $query;
if ( preg_match( '/^\s*SELECT\s+FOUND_ROWS(\s*)/i', $query ) ) {
if ( $this->is_mysql_result( $this->last_found_rows_result ) ) {
$this->result = $this->last_found_rows_result;
$this->last_found_rows_result = null;
$elapsed = 0;
} else {
$this->print_error( 'Attempted SELECT FOUND_ROWS() without prior SQL_CALC_FOUND_ROWS.' );
return false;
}
} else {
$this->dbh = $this->db_connect( $query );
if ( ! $this->is_mysql_connection( $this->dbh ) ) {
$this->check_current_query = true;
$this->last_error = 'Database connection failed';
$this->num_failed_queries++;
if ( function_exists( 'do_action' ) ) {
do_action( 'sql_query_log', $query, false, $this->last_error );
}
return false;
}
$query_comment = $this->run_callbacks( 'get_query_comment', $query );
if ( ! empty( $query_comment ) ) {
$query = rtrim( $query, ";\t \n\r" ) . ' /* ' . $query_comment . ' */';
}
// If we're writing to the database, make sure the query will write safely.
if ( $this->check_current_query && method_exists( $this, 'check_ascii' ) && ! $this->check_ascii( $query ) ) {
$stripped_query = $this->strip_invalid_text_from_query( $query );
// strip_invalid_text_from_query() can perform queries, so we need
// to flush again, just to make sure everything is clear.
$this->flush();
if ( $stripped_query !== $query ) {
$this->insert_id = 0;
$this->last_error = 'Invalid query';
$this->num_failed_queries++;
if ( function_exists( 'do_action' ) ) {
do_action( 'sql_query_log', $query, false, $this->last_error );
}
return false;
}
}
$this->check_current_query = true;
// Inject setup and teardown statements
$statement_before_query = $this->run_callbacks( 'statement_before_query' );
$statement_after_query = $this->run_callbacks( 'statement_after_query' );
$query_for_log = $query;
$this->timer_start();
if ( $statement_before_query ) {
$query_for_log = "$statement_before_query; $query_for_log";
$this->ex_mysql_query( $statement_before_query, $this->dbh );
}
$this->result = $this->ex_mysql_query( $query, $this->dbh );
if ( $statement_after_query ) {
$query_for_log = "$query_for_log; $statement_after_query";
$this->ex_mysql_query( $statement_after_query, $this->dbh );
}
$elapsed = $this->timer_stop();
++$this->num_queries;
if ( preg_match( '/^\s*SELECT\s+SQL_CALC_FOUND_ROWS\s/i', $query ) ) {
if ( false === strpos( $query, 'NO_SELECT_FOUND_ROWS' ) ) {
$this->timer_start();
$this->last_found_rows_result = $this->ex_mysql_query( 'SELECT FOUND_ROWS()', $this->dbh );
$elapsed += $this->timer_stop();
++$this->num_queries;
$query .= '; SELECT FOUND_ROWS()';
}
} else {
$this->last_found_rows_result = null;
}
$this->dbhname_heartbeats[ $this->dbhname ]['last_used'] = microtime( true );
if ( $this->save_queries ) {
if ( is_callable( $this->save_query_callback ) ) {
// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_debug_backtrace
$saved_query = call_user_func_array( $this->save_query_callback, array( $query_for_log, $elapsed, $this->save_backtrace ? debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS ) : null, $this ) );
if ( null !== $saved_query ) {
$this->queries[] = $saved_query;
}
} else {
$this->queries[] = array( $query_for_log, $elapsed, $this->get_caller() );
}
}
}