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vendor/doctrine/dbal/src/Connections/PrimaryReadReplicaConnection.php

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+<?php
+
+namespace Doctrine\DBAL\Connections;
+
+use Doctrine\Common\EventManager;
+use Doctrine\DBAL\Configuration;
+use Doctrine\DBAL\Connection;
+use Doctrine\DBAL\Driver;
+use Doctrine\DBAL\Driver\Connection as DriverConnection;
+use Doctrine\DBAL\Driver\Exception as DriverException;
+use Doctrine\DBAL\DriverManager;
+use Doctrine\DBAL\Event\ConnectionEventArgs;
+use Doctrine\DBAL\Events;
+use Doctrine\DBAL\Exception;
+use Doctrine\DBAL\Statement;
+use Doctrine\Deprecations\Deprecation;
+use InvalidArgumentException;
+use SensitiveParameter;
+
+use function array_rand;
+use function count;
+
+/**
+ * Primary-Replica Connection
+ *
+ * Connection can be used with primary-replica setups.
+ *
+ * Important for the understanding of this connection should be how and when
+ * it picks the replica or primary.
+ *
+ * 1. Replica if primary was never picked before and ONLY if 'getWrappedConnection'
+ *    or 'executeQuery' is used.
+ * 2. Primary picked when 'executeStatement', 'insert', 'delete', 'update', 'createSavepoint',
+ *    'releaseSavepoint', 'beginTransaction', 'rollback', 'commit' or 'prepare' is called.
+ * 3. If Primary was picked once during the lifetime of the connection it will always get picked afterwards.
+ * 4. One replica connection is randomly picked ONCE during a request.
+ *
+ * ATTENTION: You can write to the replica with this connection if you execute a write query without
+ * opening up a transaction. For example:
+ *
+ *      $conn = DriverManager::getConnection(...);
+ *      $conn->executeQuery("DELETE FROM table");
+ *
+ * Be aware that Connection#executeQuery is a method specifically for READ
+ * operations only.
+ *
+ * Use Connection#executeStatement for any SQL statement that changes/updates
+ * state in the database (UPDATE, INSERT, DELETE or DDL statements).
+ *
+ * This connection is limited to replica operations using the
+ * Connection#executeQuery operation only, because it wouldn't be compatible
+ * with the ORM or SchemaManager code otherwise. Both use all the other
+ * operations in a context where writes could happen to a replica, which makes
+ * this restricted approach necessary.
+ *
+ * You can manually connect to the primary at any time by calling:
+ *
+ *      $conn->ensureConnectedToPrimary();
+ *
+ * Instantiation through the DriverManager looks like:
+ *
+ * @psalm-import-type Params from DriverManager
+ * @example
+ *
+ * $conn = DriverManager::getConnection(array(
+ *    'wrapperClass' => 'Doctrine\DBAL\Connections\PrimaryReadReplicaConnection',
+ *    'driver' => 'pdo_mysql',
+ *    'primary' => array('user' => '', 'password' => '', 'host' => '', 'dbname' => ''),
+ *    'replica' => array(
+ *        array('user' => 'replica1', 'password' => '', 'host' => '', 'dbname' => ''),
+ *        array('user' => 'replica2', 'password' => '', 'host' => '', 'dbname' => ''),
+ *    )
+ * ));
+ *
+ * You can also pass 'driverOptions' and any other documented option to each of this drivers
+ * to pass additional information.
+ */
+class PrimaryReadReplicaConnection extends Connection
+{
+    /**
+     * Primary and Replica connection (one of the randomly picked replicas).
+     *
+     * @var DriverConnection[]|null[]
+     */
+    protected $connections = ['primary' => null, 'replica' => null];
+
+    /**
+     * You can keep the replica connection and then switch back to it
+     * during the request if you know what you are doing.
+     *
+     * @var bool
+     */
+    protected $keepReplica = false;
+
+    /**
+     * Creates Primary Replica Connection.
+     *
+     * @internal The connection can be only instantiated by the driver manager.
+     *
+     * @param array<string,mixed> $params
+     * @psalm-param Params $params
+     *
+     * @throws Exception
+     * @throws InvalidArgumentException
+     */
+    public function __construct(
+        array $params,
+        Driver $driver,
+        ?Configuration $config = null,
+        ?EventManager $eventManager = null
+    ) {
+        if (! isset($params['replica'], $params['primary'])) {
+            throw new InvalidArgumentException('primary or replica configuration missing');
+        }
+
+        if (count($params['replica']) === 0) {
+            throw new InvalidArgumentException('You have to configure at least one replica.');
+        }
+
+        if (isset($params['driver'])) {
+            $params['primary']['driver'] = $params['driver'];
+
+            foreach ($params['replica'] as $replicaKey => $replica) {
+                $params['replica'][$replicaKey]['driver'] = $params['driver'];
+            }
+        }
+
+        $this->keepReplica = (bool) ($params['keepReplica'] ?? false);
+
+        parent::__construct($params, $driver, $config, $eventManager);
+    }
+
+    /**
+     * Checks if the connection is currently towards the primary or not.
+     */
+    public function isConnectedToPrimary(): bool
+    {
+        return $this->_conn !== null && $this->_conn === $this->connections['primary'];
+    }
+
+    /**
+     * @param string|null $connectionName
+     *
+     * @return bool
+     */
+    public function connect($connectionName = null)
+    {
+        if ($connectionName !== null) {
+            throw new InvalidArgumentException(
+                'Passing a connection name as first argument is not supported anymore.'
+                    . ' Use ensureConnectedToPrimary()/ensureConnectedToReplica() instead.',
+            );
+        }
+
+        return $this->performConnect();
+    }
+
+    protected function performConnect(?string $connectionName = null): bool
+    {
+        $requestedConnectionChange = ($connectionName !== null);
+        $connectionName            = $connectionName ?? 'replica';
+
+        if ($connectionName !== 'replica' && $connectionName !== 'primary') {
+            throw new InvalidArgumentException('Invalid option to connect(), only primary or replica allowed.');
+        }
+
+        // If we have a connection open, and this is not an explicit connection
+        // change request, then abort right here, because we are already done.
+        // This prevents writes to the replica in case of "keepReplica" option enabled.
+        if ($this->_conn !== null && ! $requestedConnectionChange) {
+            return false;
+        }
+
+        $forcePrimaryAsReplica = false;
+
+        if ($this->getTransactionNestingLevel() > 0) {
+            $connectionName        = 'primary';
+            $forcePrimaryAsReplica = true;
+        }
+
+        if (isset($this->connections[$connectionName])) {
+            $this->_conn = $this->connections[$connectionName];
+
+            if ($forcePrimaryAsReplica && ! $this->keepReplica) {
+                $this->connections['replica'] = $this->_conn;
+            }
+
+            return false;
+        }
+
+        if ($connectionName === 'primary') {
+            $this->connections['primary'] = $this->_conn = $this->connectTo($connectionName);
+
+            // Set replica connection to primary to avoid invalid reads
+            if (! $this->keepReplica) {
+                $this->connections['replica'] = $this->connections['primary'];
+            }
+        } else {
+            $this->connections['replica'] = $this->_conn = $this->connectTo($connectionName);
+        }
+
+        if ($this->_eventManager->hasListeners(Events::postConnect)) {
+            Deprecation::trigger(
+                'doctrine/dbal',
+                'https://github.com/doctrine/dbal/issues/5784',
+                'Subscribing to %s events is deprecated. Implement a middleware instead.',
+                Events::postConnect,
+            );
+
+            $eventArgs = new ConnectionEventArgs($this);
+            $this->_eventManager->dispatchEvent(Events::postConnect, $eventArgs);
+        }
+
+        return true;
+    }
+
+    /**
+     * Connects to the primary node of the database cluster.
+     *
+     * All following statements after this will be executed against the primary node.
+     */
+    public function ensureConnectedToPrimary(): bool
+    {
+        return $this->performConnect('primary');
+    }
+
+    /**
+     * Connects to a replica node of the database cluster.
+     *
+     * All following statements after this will be executed against the replica node,
+     * unless the keepReplica option is set to false and a primary connection
+     * was already opened.
+     */
+    public function ensureConnectedToReplica(): bool
+    {
+        return $this->performConnect('replica');
+    }
+
+    /**
+     * Connects to a specific connection.
+     *
+     * @param string $connectionName
+     *
+     * @return DriverConnection
+     *
+     * @throws Exception
+     */
+    protected function connectTo($connectionName)
+    {
+        $params = $this->getParams();
+
+        $connectionParams = $this->chooseConnectionConfiguration($connectionName, $params);
+
+        try {
+            return $this->_driver->connect($connectionParams);
+        } catch (DriverException $e) {
+            throw $this->convertException($e);
+        }
+    }
+
+    /**
+     * @param string  $connectionName
+     * @param mixed[] $params
+     *
+     * @return mixed
+     */
+    protected function chooseConnectionConfiguration(
+        $connectionName,
+        #[SensitiveParameter]
+        $params
+    ) {
+        if ($connectionName === 'primary') {
+            return $params['primary'];
+        }
+
+        $config = $params['replica'][array_rand($params['replica'])];
+
+        if (! isset($config['charset']) && isset($params['primary']['charset'])) {
+            $config['charset'] = $params['primary']['charset'];
+        }
+
+        return $config;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function executeStatement($sql, array $params = [], array $types = [])
+    {
+        $this->ensureConnectedToPrimary();
+
+        return parent::executeStatement($sql, $params, $types);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function beginTransaction()
+    {
+        $this->ensureConnectedToPrimary();
+
+        return parent::beginTransaction();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function commit()
+    {
+        $this->ensureConnectedToPrimary();
+
+        return parent::commit();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function rollBack()
+    {
+        $this->ensureConnectedToPrimary();
+
+        return parent::rollBack();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function close()
+    {
+        unset($this->connections['primary'], $this->connections['replica']);
+
+        parent::close();
+
+        $this->_conn       = null;
+        $this->connections = ['primary' => null, 'replica' => null];
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function createSavepoint($savepoint)
+    {
+        $this->ensureConnectedToPrimary();
+
+        parent::createSavepoint($savepoint);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function releaseSavepoint($savepoint)
+    {
+        $this->ensureConnectedToPrimary();
+
+        parent::releaseSavepoint($savepoint);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function rollbackSavepoint($savepoint)
+    {
+        $this->ensureConnectedToPrimary();
+
+        parent::rollbackSavepoint($savepoint);
+    }
+
+    public function prepare(string $sql): Statement
+    {
+        $this->ensureConnectedToPrimary();
+
+        return parent::prepare($sql);
+    }
+}