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vendor/cakephp/database/Retry/ErrorCodeWaitStrategy.php

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+<?php
+declare(strict_types=1);
+
+/**
+ * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ * @link          https://cakephp.org CakePHP(tm) Project
+ * @since         4.2.0
+ * @license       https://opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Database\Retry;
+
+use Cake\Core\Retry\RetryStrategyInterface;
+use Exception;
+use PDOException;
+
+/**
+ * Implements retry strategy based on db error codes and wait interval.
+ *
+ * @internal
+ */
+class ErrorCodeWaitStrategy implements RetryStrategyInterface
+{
+    /**
+     * @var array<int>
+     */
+    protected $errorCodes;
+
+    /**
+     * @var int
+     */
+    protected $retryInterval;
+
+    /**
+     * @param array<int> $errorCodes DB-specific error codes that allow retrying
+     * @param int $retryInterval Seconds to wait before allowing next retry, 0 for no wait.
+     */
+    public function __construct(array $errorCodes, int $retryInterval)
+    {
+        $this->errorCodes = $errorCodes;
+        $this->retryInterval = $retryInterval;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function shouldRetry(Exception $exception, int $retryCount): bool
+    {
+        if (
+            $exception instanceof PDOException &&
+            $exception->errorInfo &&
+            in_array($exception->errorInfo[1], $this->errorCodes)
+        ) {
+            if ($this->retryInterval > 0) {
+                sleep($this->retryInterval);
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+}

vendor/cakephp/database/Retry/ReconnectStrategy.php

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+<?php
+declare(strict_types=1);
+
+/**
+ * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ * @link          https://cakephp.org CakePHP(tm) Project
+ * @since         3.6.0
+ * @license       https://opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Database\Retry;
+
+use Cake\Core\Retry\RetryStrategyInterface;
+use Cake\Database\Connection;
+use Exception;
+
+/**
+ * Makes sure the connection to the database is alive before authorizing
+ * the retry of an action.
+ *
+ * @internal
+ */
+class ReconnectStrategy implements RetryStrategyInterface
+{
+    /**
+     * The list of error strings to match when looking for a disconnection error.
+     *
+     * This is a static variable to enable opcache to inline the values.
+     *
+     * @var array<string>
+     */
+    protected static $causes = [
+        'gone away',
+        'Lost connection',
+        'Transaction() on null',
+        'closed the connection unexpectedly',
+        'closed unexpectedly',
+        'deadlock avoided',
+        'decryption failed or bad record mac',
+        'is dead or not enabled',
+        'no connection to the server',
+        'query_wait_timeout',
+        'reset by peer',
+        'terminate due to client_idle_limit',
+        'while sending',
+        'writing data to the connection',
+    ];
+
+    /**
+     * The connection to check for validity
+     *
+     * @var \Cake\Database\Connection
+     */
+    protected $connection;
+
+    /**
+     * Creates the ReconnectStrategy object by storing a reference to the
+     * passed connection. This reference will be used to automatically
+     * reconnect to the server in case of failure.
+     *
+     * @param \Cake\Database\Connection $connection The connection to check
+     */
+    public function __construct(Connection $connection)
+    {
+        $this->connection = $connection;
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * Checks whether the exception was caused by a lost connection,
+     * and returns true if it was able to successfully reconnect.
+     */
+    public function shouldRetry(Exception $exception, int $retryCount): bool
+    {
+        $message = $exception->getMessage();
+
+        foreach (static::$causes as $cause) {
+            if (strstr($message, $cause) !== false) {
+                return $this->reconnect();
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Tries to re-establish the connection to the server, if it is safe to do so
+     *
+     * @return bool Whether the connection was re-established
+     */
+    protected function reconnect(): bool
+    {
+        if ($this->connection->inTransaction()) {
+            // It is not safe to blindly reconnect in the middle of a transaction
+            return false;
+        }
+
+        try {
+            // Make sure we free any resources associated with the old connection
+            $this->connection->getDriver()->disconnect();
+        } catch (Exception $e) {
+        }
+
+        try {
+            $this->connection->connect();
+            if ($this->connection->isQueryLoggingEnabled()) {
+                $this->connection->log('[RECONNECT]');
+            }
+
+            return true;
+        } catch (Exception $e) {
+            // If there was an error connecting again, don't report it back,
+            // let the retry handler do it.
+            return false;
+        }
+    }
+}