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Example code of flix-tech/guzzle-circuit-breaker-middleware

Informations about the package guzzle-circuit-breaker-middleware

Guzzle 6 Circuit-Breaker Middleware

Build Status

This is a Guzzle 6 middleware that integrates https://github.com/ejsmont-artur/php-circuit-breaker.

Contents

Requirements

Dependencies

Dependency Version Reason
php ~7.0 Anything lower has (almost) reached EOL
guzzlephp/promises ~6.2 Middlewares pass Promises around
psr/http-message ~1.0 Standardization, doh
ejsmont-artur/php-circuit-breaker ~0.1 Simple and robust Circuit Breaker implementation for PHP

Installation

This library is installed via composer.

Usage

NOTE It is recommended that this middleware is on top of the stack so that if a service is unavailable, it can instantly reject without going further down the chain.

With the default configuration, this middleware will inspect the PSR-7 requests for either a transport option key "circuit_breaker.requested_service_name" exposed via Middleware::CB_TRANSFER_OPTION_KEY in the request options array, or a request header "X-CB-Service-Name" exposed via Middleware::CB_SERVICE_NAME_HEADER. You can pass an own service name extractor callable that takes the form f(RequestInterface $request, array $requestOptions): string.

The service name will be used to look up the availability in the circuit breaker. If it is not available, it will be instantly rejected with a CircuitBreakerIsClosedException.

If the request was successful, the middleware will report a success to the circuit breaker for the given service. Otherwise it will report a failure and pass the rejection further down the chain.

You can pass a custom exception map into the middleware with which you can control which exception types and values should actually trigger a failure report. I.e. a 404 might be a failed configuration issue and might not trigger failure reports. The exception map callback takes the form f($rejectedValue): bool.

Example

Testing

To run the tests, just run ./vendor/bin/phpunit from the root of the project after installing the dev requirements.

Contributing

In order to contribute to this library, follow this workflow:

All versions of guzzle-circuit-breaker-middleware with dependencies

PHP Build Version
Package Version
Requires guzzlehttp/promises Version ~1.2
psr/http-message Version ~1.0
ejsmont-artur/php-circuit-breaker Version ~0.1
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