PHP Initial Event Propagation

This package helps to propagate initial event data to other backend services Laravel Bridge

Installation

You can install the package via composer:

composer require ensi/initial-event-propagation

Version Compatibility

Laravel IEP	PHP
^0.1.0	^8.0
^0.2.0	^8.0
^0.3.0	^8.1

Basic usage

First of all you need to create initial event data and place it to holder:

use Ensi\InitialEventPropagation\InitialEventHolder;
use Ensi\InitialEventPropagation\InitialEventDTO;

InitialEventHolder::getInstance()
    ->setInitialEvent(
        InitialEventDTO::fromScratch(
            userId: "1",
            userType: "admin",
            app: "mobile-api-gateway",
            entrypoint: "/api/v1/users/{id}"
        )
    );

If you are not in initial entrypoint context to need to get initial event from X-Initial-Event request header instead of creating it from scratch:

use Ensi\InitialEventPropagation\Config;
use Ensi\InitialEventPropagation\InitialEventHolder;
use Ensi\InitialEventPropagation\InitialEventDTO;

InitialEventHolder::getInstance()
    ->setInitialEvent(
        InitialEventDTO::fromSerializedString($request->header(Config::REQUEST_HEADER))
    );

Next, extract DTO from holder (InitialEventHolder::getInstance()->getInitialEvent()) and pass it to any futher outcomming requests (Guzzle, RabbitMQ, Kafka etc) For example:

use Ensi\InitialEventPropagation\Config;
use Ensi\InitialEventPropagation\InitialEventHolder;

function some_middleware(callable $handler)
{
    return function (RequestInterface $request, $options) use ($handler) {
        $inititiator = InitialEventHolder::getInstance()->getInitialEvent();

        return $handler(
            $inititiator ? $request->withHeader(Config::REQUEST_HEADER, $inititiator->serialize()) : $request,
            $options
        );
    };
}

Contributing

Please see CONTRIBUTING for details.

Testing

1. composer install
2. composer test

Security Vulnerabilities

Please review our security policy on how to report security vulnerabilities.

License

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