<?php
namespace Illuminate\Database\Connectors;
use Illuminate\Contracts\Container\Container;
use Illuminate\Database\Connection;
use Illuminate\Database\MySqlConnection;
use Illuminate\Database\PostgresConnection;
use Illuminate\Database\SQLiteConnection;
use Illuminate\Database\SqlServerConnection;
use Illuminate\Support\Arr;
use InvalidArgumentException;
use PDOException;
class ConnectionFactory
{
/**
* The IoC container instance.
*
* @var \Illuminate\Contracts\Container\Container
*/
protected $container;
/**
* Create a new connection factory instance.
*
* @param \Illuminate\Contracts\Container\Container $container
* @return void
*/
public function __construct(Container $container)
{
$this->container = $container;
}
/**
* Establish a PDO connection based on the configuration.
*
* @param array $config
* @param string|null $name
* @return \Illuminate\Database\Connection
*/
public function make(array $config, $name = null)
{
$config = $this->parseConfig($config, $name);
if (isset($config['read'])) {
return $this->createReadWriteConnection($config);
}
return $this->createSingleConnection($config);
}
/**
* Parse and prepare the database configuration.
*
* @param array $config
* @param string $name
* @return array
*/
protected function parseConfig(array $config, $name)
{
return Arr::add(Arr::add($config, 'prefix', ''), 'name', $name);
}
/**
* Create a single database connection instance.
*
* @param array $config
* @return \Illuminate\Database\Connection
*/
protected function createSingleConnection(array $config)
{
$pdo = $this->createPdoResolver($config);
return $this->createConnection(
$config['driver'], $pdo, $config['database'], $config['prefix'], $config
);
}
/**
* Create a read / write database connection instance.
*
* @param array $config
* @return \Illuminate\Database\Connection
*/
protected function createReadWriteConnection(array $config)
{
$connection = $this->createSingleConnection($this->getWriteConfig($config));
return $connection->setReadPdo($this->createReadPdo($config));
}
/**
* Create a new PDO instance for reading.
*
* @param array $config
* @return \Closure
*/
protected function createReadPdo(array $config)
{
return $this->createPdoResolver($this->getReadConfig($config));
}
/**
* Get the read configuration for a read / write connection.
*
* @param array $config
* @return array
*/
protected function getReadConfig(array $config)
{
return $this->mergeReadWriteConfig(
$config, $this->getReadWriteConfig($config, 'read')
);
}
/**
* Get the write configuration for a read / write connection.
*
* @param array $config
* @return array
*/
protected function getWriteConfig(array $config)
{
return $this->mergeReadWriteConfig(
$config, $this->getReadWriteConfig($config, 'write')
);
}
/**
* Get a read / write level configuration.
*
* @param array $config
* @param string $type
* @return array
*/
protected function getReadWriteConfig(array $config, $type)
{
return isset($config[$type][0])
? Arr::random($config[$type])
: $config[$type];
}
/**
* Merge a configuration for a read / write connection.
*
* @param array $config
* @param array $merge
* @return array
*/
protected function mergeReadWriteConfig(array $config, array $merge)
{
return Arr::except(array_merge($config, $merge), ['read', 'write']);
}
/**
* Create a new Closure that resolves to a PDO instance.
*
* @param array $config
* @return \Closure
*/
protected function createPdoResolver(array $config)
{
return array_key_exists('host', $config)
? $this->createPdoResolverWithHosts($config)
: $this->createPdoResolverWithoutHosts($config);
}
/**
* Create a new Closure that resolves to a PDO instance with a specific host or an array of hosts.
*
* @param array $config
* @return \Closure
*
* @throws \PDOException
*/
protected function createPdoResolverWithHosts(array $config)
{
return function () use ($config) {
foreach (Arr::shuffle($hosts = $this->parseHosts($config)) as $key => $host) {
$config['host'] = $host;
try {
return $this->createConnector($config)->connect($config);
} catch (PDOException $e) {
continue;
}
}
throw $e;
};
}
/**
* Parse the hosts configuration item into an array.
*
* @param array $config
* @return array
*
* @throws \InvalidArgumentException
*/
protected function parseHosts(array $config)
{
$hosts = Arr::wrap($config['host']);
if (empty($hosts)) {
throw new InvalidArgumentException('Database hosts array is empty.');
}
return $hosts;
}
/**
* Create a new Closure that resolves to a PDO instance where there is no configured host.
*
* @param array $config
* @return \Closure
*/
protected function createPdoResolverWithoutHosts(array $config)
{
return function () use ($config) {
return $this->createConnector($config)->connect($config);
};
}
/**
* Create a connector instance based on the configuration.
*
* @param array $config
* @return \Illuminate\Database\Connectors\ConnectorInterface
*
* @throws \InvalidArgumentException
*/
public function createConnector(array $config)
{
if (! isset($config['driver'])) {
throw new InvalidArgumentException('A driver must be specified.');
}
if ($this->container->bound($key = "db.connector.{$config['driver']}")) {
return $this->container->make($key);
}
switch ($config['driver']) {
case 'mysql':
return new MySqlConnector;
case 'pgsql':
return new PostgresConnector;
case 'sqlite':
return new SQLiteConnector;
case 'sqlsrv':
return new SqlServerConnector;
}
throw new InvalidArgumentException("Unsupported driver [{$config['driver']}].");
}
/**
* Create a new connection instance.
*
* @param string $driver
* @param \PDO|\Closure $connection
* @param string $database
* @param string $prefix
* @param array $config
* @return \Illuminate\Database\Connection
*
* @throws \InvalidArgumentException
*/
protected function createConnection($driver, $connection, $database, $prefix = '', array $config = [])
{
if ($resolver = Connection::getResolver($driver)) {
return $resolver($connection, $database, $prefix, $config);
}
switch ($driver) {
case 'mysql':
return new MySqlConnection($connection, $database, $prefix, $config);
case 'pgsql':
return new PostgresConnection($connection, $database, $prefix, $config);
case 'sqlite':
return new SQLiteConnection($connection, $database, $prefix, $config);
case 'sqlsrv':
return new SqlServerConnection($connection, $database, $prefix, $config);
}
throw new InvalidArgumentException("Unsupported driver [{$driver}].");
}
}