Source of file ConnectionManager.php

<?php declare(strict_types=1);

/**

 * Query

 *

 * SQL Query Builder / Database Abstraction Layer

 *

 * PHP version 7.1

 *

 * @package     Query

 * @author      Timothy J. Warren <tim@timshomepage.net>

 * @copyright   2012 - 2018 Timothy J. Warren

 * @license     http://www.opensource.org/licenses/mit-license.html  MIT License

 * @link        https://git.timshomepage.net/aviat4ion/Query

 */

namespace Query;

use DomainException;

use InvalidArgumentException;

/**

 * Connection manager class to manage connections for the

 * Query method

 */

final class ConnectionManager {

	/**

	 * Map of named database connections

	 * @var array

	 */

	private $connections = [];

	/**

	 * Class instance variable

	 * @var ConnectionManager|null

	 */

	private static $instance;

	/**

	 * Private constructor to prevent multiple instances

	 * @codeCoverageIgnore

	 */

	private function __construct()

	{

	}

	/**

	 * Private clone method to prevent cloning

	 *

	 * @throws DomainException

	 * @return void

	 */

	public function __clone()

	{

		throw new DomainException("Can't clone singleton");

	}

	/**

	 * Prevent serialization of this object

	 *

	 * @throws DomainException

	 * @return void

	 */

	public function __sleep()

	{

		throw new DomainException('No serializing of singleton');

	}

	/**

	 * Make sure serialize/deserialize doesn't work

	 *

	 * @throws DomainException

	 * @return void

	 */

	public function __wakeup()

	{

		throw new DomainException("Can't unserialize singleton");

	}

	/**

	 * Return  a connection manager instance

	 *

	 * @staticvar null $instance

	 * @return ConnectionManager

	 */

	public static function getInstance(): ConnectionManager

	{

		if (self::$instance === NULL)

		{

			self::$instance = new self();

		}

		return self::$instance;

	}

	/**

	 * Returns the connection specified by the name given

	 *

	 * @param string|array|object $name

	 * @return QueryBuilderInterface

	 * @throws InvalidArgumentException

	 */

	public function getConnection($name = ''): QueryBuilderInterface

	{

		// If the parameter is a string, use it as an array index

		if (is_scalar($name) && isset($this->connections[$name]))

		{

			return $this->connections[$name];

		}

		else if (empty($name) && ! empty($this->connections)) // Otherwise, return the last one

		{

			return end($this->connections);

		}

		// You should actually connect before trying to get a connection...

		throw new InvalidArgumentException('The specified connection does not exist');

	}

	/**

	 * Parse the passed parameters and return a connection

	 *

	 * @param object|array $params

	 * @throws BadDBDriverException

	 * @return QueryBuilderInterface

	 */

	public function connect($params): QueryBuilderInterface

	{

		[$dsn, $dbtype, $params, $options] = $this->parseParams($params);

		$dbtype = ucfirst($dbtype);

		$driver = "\\Query\\Drivers\\{$dbtype}\\Driver";

		// Create the database connection

		$db =  ! empty($params->user)

			? new $driver($dsn, $params->user, $params->pass, $options)

			: new $driver($dsn, '', '', $options);

		// Set the table prefix, if it exists

		if (isset($params->prefix))

		{

			$db->setTablePrefix($params->prefix);

		}

		// Create Query Builder object

		$conn = new QueryBuilder($db, new QueryParser($db));

		// Save it for later

		if (isset($params->alias))

		{

			$this->connections[$params->alias] = $conn;

		}

		else

		{

			$this->connections[] = $conn;

		}

		return $conn;

	}

	/**

	 * Parses params into a dsn and option array

	 *

	 * @param \stdClass $params

	 * @return object|array

	 * @throws BadDBDriverException

	 */

	public function parseParams($params): array

	{

		$params = (object) $params;

		$params->type = strtolower($params->type);

		$dbtype = ($params->type !== 'postgresql') ? $params->type : 'pgsql';

		$dbtype = ucfirst($dbtype);

		// Make sure the class exists

		if ( ! class_exists("\\Query\\Drivers\\{$dbtype}\\Driver"))

		{

			throw new BadDBDriverException('Database driver does not exist, or is not supported');

		}

		// Set additional PDO options

		$options = [];

		if (isset($params->options))

		{

			$options = (array) $params->options;

		}

		// Create the dsn for the database to connect to

		if(strtolower($dbtype) === 'sqlite')

		{

			$dsn = $params->file;

		}

		else

		{

			$dsn = $this->createDsn($dbtype, $params);

		}

		return [$dsn, $dbtype, $params, $options];

	}

	/**

	 * Create the dsn from the db type and params

	 *

	 * @codeCoverageIgnore

	 * @param string $dbtype

	 * @param array|object $params

	 * @return string

	 */

	private function createDsn(string $dbtype, $params): string

	{

		$pairs = [];

		if ( ! empty($params->database))

		{

			$pairs[] = implode('=', ['dbname', $params->database]);

		}

		$skip = [

			'name' => 'name',

			'pass' => 'pass',

			'user' => 'user',

			'type' => 'type',

			'prefix' => 'prefix',

			'options' => 'options',

			'database' => 'database',

			'alias' => 'alias'

		];

		foreach($params as $key => $val)

		{

			if (( ! array_key_exists($key, $skip)) &&  ! empty($val))

			{

				$pairs[] = implode('=', [$key, $val]);

			}

		}

		return strtolower($dbtype) . ':' . implode(';', $pairs);

	}

}