resiliency

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A modern PHP library that allows you to make resilient calls to external services :repeat:

// repository documentation

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# Resiliency, an implementation for resilient and modern PHP applications

[![codecov](https://codecov.io/gh/loveOSS/resiliency/branch/master/graph/badge.svg)](https://codecov.io/gh/loveOSS/resiliency) [![PHPStan](https://img.shields.io/badge/PHPStan-Level%20max-brightgreen.svg?style=flat&logo=php)](https://shields.io/#/) [![Psalm](https://img.shields.io/badge/Psalm-Level%20Max-brightgreen.svg?style=flat&logo=php)](https://shields.io/#/) [![Build Status](https://travis-ci.com/loveOSS/resiliency.svg?branch=master)](https://travis-ci.com/loveOSS/resiliency)

## Main principles

![circuit breaker](https://user-images.githubusercontent.com/1247388/49721725-438bd700-fc63-11e8-8498-82ca681b15fb.png)

This library is compatible with PHP 7.4+.

## Installation

```
composer require love-oss/resiliency
```

## Use

You need to configure a system for the Circuit Breaker:

* the **failures**: define how many times we try to access the service;
* the **timeout**: define how long we wait (in ms) before consider the service unreachable;
* the **stripped timeout**: define how long we wait (in ms) before consider the service unreachable, once we're in half open state;
* the **threshold**: define how long we wait (in ms) before trying to access again the service;
* the (HTTP|HTTPS) **client** that will be used to reach the services;
* the **fallback** callback will be used if the distant service is unreachable when the Circuit Breaker is Open (means "is used").

> You'd better return the same type of response expected from your distant call.

```php
use Resiliency\MainCircuitBreaker;
use Resiliency\Systems\MainSystem;
use Resiliency\Storages\SimpleArray;
use Resiliency\Clients\SymfonyClient;
use Symfony\Component\HttpClient\HttpClient;

$client = new SymfonyClient(HttpClient::create());

$mainSystem = MainSystem::createFromArray([
    'failures' => 2,
    'timeout' => 100,
    'stripped_timeout' => 200,
    'threshold' => 10000,
], $client);

$storage = new SimpleArray();

// Any PSR-14 Event Dispatcher implementation.
$dispatcher = new Symfony\Component\EventDispatcher\EventDispatcher;

$circuitBreaker = new MainCircuitBreaker(
    $mainSystem,
    $storage,
    $dispatcher
);

/**
 * @var Service $service
 */
$fallbackResponse = function ($service) {
    return '{}';
};

$circuitBreaker->call(
    'https://api.domain.com',
    $fallbackResponse,
    [
        'query' => [
            '_token' => '123456789',
        ]
    ]
);
```

### Clients

Resiliency library supports both [Guzzle (v6 & v7)](http://docs.guzzlephp.org/en/stable/index.html) and HttpClient Component from [Symfony (v4 & v5)](https://symfony.com/doc/current/components/http_client.html).

### Monitoring

This library provides a minimalist system to help you monitor your circuits.

```php
$monitor = new SimpleMonitor();

// Collect information while listening
// to some circuit breaker events...
function listener(Event $event) {
    $monitor->add($event);
};

// Retrieve a complete report for analysis or storage
$report = $monitor->getReport();
```

## Tests

```
composer test
```

## Code quality

This library has high quality standards:

```
composer cs-fix && composer phpstan && composer psalm && composer phpqa
```

We also use [PHPQA](https://github.com/EdgedesignCZ/phpqa#phpqa) to check the Code quality
during the CI management of the contributions:

```
composer phpqa
```

## I've heard of the PrestaShop Circuit Breaker: what library should I use ?
 
 Welcome, that's an interesting question !
 
 Above all, I must say that I'm the former author of the PrestaShop [Circuit Breaker](https://github.com/PrestaShop/circuit-breaker) library
 and I have decided to fork my own library to be able to improve it without the constraints of the PrestaShop CMS main project.
 
 As of now (June, 2021), these libraries have a lot in common !
 
They share almost the same API, and the PrestaShop Core Team have created multiple implementations of [Circuit Breaker interface](https://github.com/PrestaShop/circuit-breaker/blob/develop/src/AdvancedCircuitBreaker.php) and [Factory](https://github.com/PrestaShop/circuit-breaker/blob/develop/src/AdvancedCircuitBreakerFactory.php) :

* SimpleCircuitBreaker
* AdvancedCircuitBreaker
* PartialCircuitBreaker
* SymfonyCircuitBreaker

1. They maintain a version compatible with PHP 7.2+ and Symfony 4 but not (yet ?) with PHP 8 and Symfony 5 ;
2. They have a dependency on their own package named [php-dev-tools](https://github.com/PrestaShop/php-dev-tools) ;
3. They maintain an implementation of [Storage](https://github.com/PrestaShop/circuit-breaker/blob/v4.0.0/src/Storage/DoctrineCache.php) using Doctrine Cache library ;
4. They don't have a Symfony HttpClient implementation ;
5. For the events, I'm not sure as their implementation make the list difficult to establish ;
6. They don't provide a mecanism to reset and restore a Circuit Breaker ;
7. They don't provide a mecanism to monitor the activity of a Circuit Breaker ;
8. They have removed [Psalm](https://psalm.dev/) from their CI and they don't use [PHPQA](https://github.com/EdgedesignCZ/phpqa) ;
9. They have added `declare(strict_types=1);` on all the files ;
10. They don't declare a `.gitattributes` file, this means that all tests are downloaded when [we require](https://madewithlove.com/blog/software-engineering/gitattributes/) their library ;

> All right ... but this don't tell me what library should I use in my project !

* If you need PHP 5.6, use Circuit Breaker v3
* If you need PHP 7.2, use Circuit Breaker v4
* If you need PHP 7.4+, use Resiliency
* If you need a library maintained by a team of developers, use PrestaShop
* If you trust [me](https://github.com/mickaelandrieu) to maintain this package _almost_ all alone, use Resiliency !

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