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AppWebhook Module

Provides SyncAPI and AsyncAPI schema files and the needed code to make the Mini-Framework an App with Webhook capabilities.

Installation

Configure

App Identifier

config/Shared/config_default.php

Testing the AppWebhook

You can test the AppWebhook as usual with Codeception. Before that you need to run some commands:

With these commands you've set up the AppWebhook and can start the tests

Documentation

Webhook handling

This package is responsible to receive and handle webhooks. The package provides a controller that can be used to handle incoming webhooks.

The API endpoint is /webhooks and the controller is WebhooksController inside the Glue Application. This package is not handling webhooks on its own, you must implement the logic to handle the webhooks via the provided \Spryker\Zed\AppWebhook\Dependency\Plugin\WebhookHandlerPluginInterface, see the description down below.

Process in a Nutshell

• A webhook is received by the WebhooksController and the WebhookRequestTransfer is created.
• The webhook content is mapped to a WebhookRequestTransfer.
• The WebhookRequestTransfer is passed together with a WebhookResponseTransfer to the \Spryker\Glue\AppWebhookBackendApi\Dependency\Facade\AppWebhookBackendApiToAppWebhookFacadeInterface::handleWebhook() method.
• The handleWebhook method does:
  • Creates an identifier for this specific webhook.
  • When it is not a retried webhook the webhook will be persisted in the database.
  • In case of a retried webhook the webhook will be fetched from the database.
  • When the number of retries exceeds the configurable allowed number of retries the webhook will be removed from the database and an exception will be thrown.
  • Find the correct handler for the webhook and call the handle method of the handler.
  • When the handler returns a failed WebhookResponseTransfer the response will be persisted in the database.
  • When the handler returns a not handled WebhookResponseTransfer the response will be persisted in the database with a message that was provided by the implementation of the plugin.
  • When the handler throws an exception the exception message will be persisted in the database.
  • When the handler returns a successful WebhookResponseTransfer the webhook will be removed from the database.
  • It returns the WebhookResponseTransfer to the controller.
• The controller formats the WebhookResponseTransfer into a Glue response which will be either:
  • 200 OK in case everything went well.
  • 400 BAD REQUEST in case of a failed response.

Retry Mechanism

In a case when a webhook can not be handled it is persisted in the database and will be retried with the next incoming webhook. The number of retries is configurable and can be set in the AppWebhookConfig::getAllowedNumberOfRetries() method.

There are numerous reasons why a webhook may fail. An exception is thrown, the plugin implementation returns a failed response or the plugin implementation returns a not handled response.

Another case could be an event is sent to the application before it is ready to handle it. For example, in the PreOrder payment of a PSP the order has not persisted yet and has no order-reference, but the PSP sends a webhook request about a payment state, in this case, the system has to wait until it can process the webhook.

Future improvements for the Retry mechanism

It may be helpful in the future to provide a console command that can be used to retry failed webhooks. This command can be used to retry all failed webhooks or only a specific webhook.

Configuration

Currently only the number of allowed retries can be configured. The configuration can be found in the AppWebhookConfig class.

Plugins

GlueApplication

\Spryker\Glue\AppWebhookBackendApi\Plugin\GlueApplication\AppWebhookBackendApiRouteProviderPlugin

This plugin provides the routes for the AppWebhookBackendApi module.

Extensions

\Spryker\Zed\AppWebhook\Dependency\Plugin\WebhookHandlerPluginInterface

This plugin can be implemented by any other module and has two methods:

• \Spryker\Zed\AppWebhook\Dependency\Plugin\WebhookHandlerPluginInterface::canHandle(WebhookRequestTransfer $webhookRequestTransfer): bool
• \Spryker\Zed\AppWebhook\Dependency\Plugin\WebhookHandlerPluginInterface::handle(WebhookRequestTransfer $webhookRequestTransfer): WebhookResponseTransfer

The canHandle() method is used to check if a webhook can be handled by a specific module. F.e. you have two handlers one for order.created and one for order.updated you can check in the canHandle() method if the webhook can be handled by the module and return true or false.

The handle() method is used to handle the webhook. The method is called if the canHandle() method returns true. The method should return a WebhookResponseTransfer with the status of the webhook handling.