holidaypirates / pirate-circuit-breaker
Implementation of the 2-state CircuitBreaker pattern that we use at HolidayPirates
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Requires
- php: >=7.3
- psr/simple-cache: ^1.0
Requires (Dev)
- cache/array-adapter: ^1.0
- cache/redis-adapter: ^1.0
- phpunit/phpunit: ^8.2
- roave/security-advisories: dev-master
This package is auto-updated.
Last update: 2024-10-29 05:17:00 UTC
README
This is an Implementation of the 2-state (Open and Closed) CircuitBreaker pattern that we use at HolidayPirates.
Unlike the 3-state CircuitBreaker proposed by Fowler, this implementation has only two states, "Open" and "Closed".
Install
Via Composer
$ composer require holidaypirates/pirate-circuit-breaker
Requirements
- PHP 7.3
- An implementation of the
\Psr\SimpleCache\CacheInterface
to store the services failures and circuit state OR your own storage implementation of\HolidayPirates\CircuitBreaker\Storage\StorageInterface
- For development only : Docker and Docker-Compose
Usage
<?php declare(strict_types=1); use HolidayPirates\CircuitBreaker\CircuitBreaker; use HolidayPirates\CircuitBreaker\Service\DummyService; use HolidayPirates\CircuitBreaker\Storage\Adapter\SimpleCacheAdapter; // Setup: $pool = new YourCachePool(); // Any implementation of \Psr\SimpleCache\CacheInterface $storageAdapter = new SimpleCacheAdapter($pool); $circuitBreaker = new CircuitBreaker($storageAdapter); $service = new DummyService(5, 60); //After 5 failed attempts it will wait 60 seconds before allowing more requests. $circuitBreaker->registerService($service); // Usage: $dummyApiClient = new DummyApiClient(); // This will be any service you want to protect with the CB if (false == $circuitBreaker->isServiceAvailable(DummyService::class)) { throw new \Exception('Service unavailable'); } try { $response = $dummyApiClient->sendRequest(); $circuitBreaker->reportSuccess(DummyService::class); } catch (Exception $exception) { $circuitBreaker->reportFailure(DummyService::class); throw new \Exception('Service unavailable',0, $exception); }
Please note that
HolidayPirates\CircuitBreaker\Service\DummyService
is just an implementation of\HolidayPirates\CircuitBreaker\Service\ServiceInterface
.
You must create your own implementations of\HolidayPirates\CircuitBreaker\Service\ServiceInterface
for each service that you want the CircuitBreaker to operate in.
For more examples of usage please see \HolidayPirates\Tests\Integration\CircuitBreaker\CircuitBreakerTest
Testing
$ docker-compose run php vendor/bin/phpunit
Credits
License
The MIT License (MIT). Please see License File for more information.