README

A PHP package to wrap any piece of code with a retry algorithm. It provides a simple and flexible way to handle transient failures in your code by automatically retrying operations that fail due to exceptions.

Requirements

• PHP 8.2 or higher

Installation

You can install the package via composer:

composer require georgii-web/retry

Basic Usage

The most basic way to use the package is to retry a piece of code a specific number of times:

use GeorgII\Retry;

// Retry a function 3 times on any exception
$result = Retry::onAnyException(fn() => someOperation());

Some possible options:

use GeorgII\Retry;
use GeorgII\RetryEvent;

// Retry a function 2 times, with a small delay and logging events on any exception
$result = Retry::onAnyException(
    attemptCallback: function (RetryEvent $event) {
        // Your code that might fail
       return someOperation($event);
    },
    retryCount: 2,
    retryDelay: 0.1,
    eventCallback: function (RetryEvent $event) {
        var_dump($event->getName());
    }
);

Warning: Only temporary exceptions should be retried. It is not meaningful to retry exceptions such as Throwable, validation exceptions, or any other issues that are unlikely to be resolved on subsequent attempts. Retrying should be reserved for transient errors, such as connection issues, where a retry has a realistic chance of succeeding.

Custom aliases

To simplify the definition of specific retry logic, you can utilize an alias. If the default retry logic is not sufficient for your needs, define your own in the project (e.g., specifying delays and exceptions to retry), wrap it in an alias, and use it in a straightforward manner.

    /**
     * Retry on DB exception alias.
     *
     * @template R
     *
     * @param Closure(RetryEvent): R          $attemptCallback
     * @param positive-int|null               $retryCount
     * @param positive-int|float|Closure|null $retryDelay
     * @param Closure(RetryEvent):void|null   $eventCallback
     *
     * @return R
     */
    public static function onDbException(
        Closure $attemptCallback,
        ?int $retryCount = null,
        int|float|Closure|null $retryDelay = null,
        ?Closure $eventCallback = null,
    ): mixed {
        $retry = new RetryCore();

        return $retry
            ->setRetryExceptions([
                ConnectionLost::class,
            ])
            ->setEventCallback($eventCallback)
            ->setRetryCount($retryCount)
            ->setRetryDelay($retryDelay)
            ->setEventFactory(new RetryEventFactory($retry))
            ->setCheckExactException(false)
            ->handle($attemptCallback);
    }

Alias usage:

$users = Retry::onDbException(fn() => $sql->query('SELECT * from users'));

Documentation

For detailed usage examples and API reference, please see the Documentation.

Development

For information on setting up the development environment and contributing to the project, please see the Development Guide.

License

The MIT License (MIT). Please see License File for more information.