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219 lines (181 loc) · 5.29 KB
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<?php
namespace PHPCensor;
use Exception;
use PDO;
use PDOException;
use PDOStatement;
class Database extends PDO
{
const MYSQL_TYPE = 'mysql';
const POSTGRESQL_TYPE = 'pgsql';
/**
* @var string
*/
protected $type = 'read';
/**
* @var bool
*/
protected static $initialised = false;
/**
* @var array
*/
protected static $servers = [
'read' => [],
'write' => []
];
/**
* @var array
*/
protected static $connections = [
'read' => null,
'write' => null
];
/**
* @var array
*/
protected static $dsn = [
'read' => '',
'write' => ''
];
protected static $details = [];
/**
* @param string $table
*
* @return string
*/
public function lastInsertIdExtended($table = null)
{
if ($table && self::POSTGRESQL_TYPE === $this->getAttribute(self::ATTR_DRIVER_NAME)) {
return parent::lastInsertId('"' . $table . '_id_seq"');
}
return parent::lastInsertId();
}
protected static function init()
{
$config = Config::getInstance();
$settings = $config->get('php-censor.database', []);
self::$servers['read'] = $settings['servers']['read'];
self::$servers['write'] = $settings['servers']['write'];
self::$details['driver'] = $settings['type'];
self::$details['db'] = $settings['name'];
self::$details['user'] = $settings['username'];
self::$details['pass'] = $settings['password'];
self::$initialised = true;
}
/**
* @param string $type
*
* @return Database
*
* @throws Exception
*/
public static function getConnection($type = 'read')
{
if (!self::$initialised) {
self::init();
}
if (is_null(self::$connections[$type])) {
// Shuffle, so we pick a random server:
$servers = self::$servers[$type];
shuffle($servers);
$connection = null;
// Loop until we get a working connection:
while (count($servers)) {
// Pull the next server:
$server = array_shift($servers);
self::$dsn[$type] = self::$details['driver'] . ':host=' . $server['host'];
if (self::$details['driver'] === 'pgsql') {
if (!array_key_exists('pgsql-sslmode', $server)) {
$server['pgsql-sslmode'] = 'prefer';
}
self::$dsn[$type] .= ';sslmode=' . $server['pgsql-sslmode'];
}
if (isset($server['port'])) {
self::$dsn[$type] .= ';port=' . (int)$server['port'];
}
self::$dsn[$type] .= ';dbname=' . self::$details['db'];
$pdoOptions = [
PDO::ATTR_PERSISTENT => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_TIMEOUT => 2,
];
if (self::MYSQL_TYPE === self::$details['driver']) {
$pdoOptions[PDO::MYSQL_ATTR_INIT_COMMAND] = "SET NAMES 'UTF8'";
}
// Try to connect:
try {
$connection = new self(
self::$dsn[$type],
self::$details['user'],
self::$details['pass'],
$pdoOptions
);
$connection->setType($type);
} catch (PDOException $ex) {
$connection = false;
}
// Opened a connection? Break the loop:
if ($connection) {
break;
}
}
// No connection? Oh dear.
if (!$connection && $type === 'read') {
throw new Exception('Could not connect to any ' . $type . ' servers.');
}
self::$connections[$type] = $connection;
}
return self::$connections[$type];
}
/**
* @return array
*/
public function getDetails()
{
return self::$details;
}
/**
* @return string
*/
public function getDsn()
{
return self::$dsn[$this->type];
}
/**
* @param string $type
*/
public function setType($type)
{
$this->type = $type;
}
public static function reset()
{
self::$connections = ['read' => null, 'write' => null];
self::$initialised = false;
}
/**
* @param string $statement
*
* @return string
*/
protected function quoteNames($statement)
{
$quote = '';
if (self::MYSQL_TYPE === self::$details['driver']) {
$quote = '`';
} elseif (self::POSTGRESQL_TYPE === self::$details['driver']) {
$quote = '"';
}
return preg_replace('/{{(.*?)}}/', ($quote . '\1' . $quote), $statement);
}
/**
* @param string $statement
* @param array $driverOptions
*
* @return PDOStatement
*/
public function prepareCommon($statement, array $driverOptions = [])
{
return parent::prepare($this->quoteNames($statement), $driverOptions);
}
}