Transfering data between Yves and Zed

Yves gets most of its data from the client-side NoSQL data stores (data such as product details, product categories, prices, etc.). There are situations when Yves needs to communicate with Zed either to submit data (for example, the customer has submitted a new order or subscribed to a newsletter) or to retrieve data (for example, order history for the customer, customer account details).

In this article, we’ll exemplify how you can set up communication between Yves and Zed. We’ll display a random salutation message that is retrieved from Zed.

To implement communication between Yves and Zed, follow the steps below.

1. Create a transfer object

Communication between Yves and Zed is done using transfer objects. So the first thing you have to do to establish communication between Yves and Zed, is to create a transfer object as follows:

1. Create a new transfer object and add it to the src/Pyz/Shared/HelloWorld/Transfer/ folder. In our example, we’ve called the transfer object helloworld.transfer.xml and assigned one property to it:

<?xml version="1.0"?>
<transfers xmlns="spryker:transfer-01"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="spryker:transfer-01 http://static.spryker.com/transfer-01.xsd">

    <transfer name="HelloWorldMessage">
        <property name="value" type="string" />
    </transfer>

</transfers>

2. Run the console command to generate the transfer object so that it’s ready to be used:

console transfer:generate

3. Add an operation to your HelloWorldFacade that will return a random salutation message using the transfer object you’ve just defined:

<?php
/**
 * @return \Generated\Shared\Transfer\HelloWorldMessageTransfer
 */
public function getSalutationMessage()
{
    return $this->getFactory()->createMessageGenerator()->generateHelloMessage();
}

2. Create the gateway controller

The GatewayController is responsible for communication with Yves. It must extend the AbstractGatewayController class. So your next step is to create the controller.

Create the GatewayController in Zed under Pyz\Zed\HelloWorld\Communication\Controller. Add an action to this controller that will call the functionality you have exposed through your facade:

<?php
namespace Pyz\Zed\HelloWorld\Communication\Controller;

use Spryker\Zed\Kernel\Communication\Controller\AbstractGatewayController;

/**
 * @method \Pyz\Zed\HelloWorld\Business\HelloWorldFacade getFacade()
 */
class GatewayController extends AbstractGatewayController
{
    /**
     *  @return \Generated\Shared\Transfer\HelloWorldMessageTransfer
     */
    public function getSalutationMessageAction()
    {
        return $this->getFacade()
                    ->getSalutationMessage();
    }
}

3. Implement the stub

Your next step is to move to the client part to add support for calling the controller action we’ve just added. Follow the steps below.

1. Create a HelloWorldStub stub under src/Pyz/Client/HelloWorld/Zed. This stub will enable you to submit an HTTP request to Zed.

<?php

namespace Pyz\Client\HelloWorld\Zed;

use Generated\Shared\Transfer\HelloWorldMessageTransfer;
use Spryker\Client\ZedRequest\ZedRequestClientInterface;

class HelloWorldStub implements HelloWorldStubInterface
{

    /**
     * @var \Spryker\Client\ZedRequest\ZedRequestClientInterface
     */
    protected $zedRequestClient;

    /**
     * @param \Spryker\Client\ZedRequest\ZedRequestClientInterface $zedRequestClient
     */
    public function __construct(ZedRequestClientInterface $zedRequestClient)
    {
        $this->zedRequestClient = $zedRequestClient;
    }

    /**
     * @return \Generated\Shared\Transfer\HelloWorldMessageTransfer
     */
    public function getSalutationMessage()
    {
        return $this->zedRequestClient->call(
            '/hello-world/gateway/get-salutation-message',
            new HelloWorldMessageTransfer()
        );
    }

}

2. Add the corresponding interface for the stub (HelloWorldStubInterface). The interface should contain the getSalutationMessage() method defined.

<?php

namespace Pyz\Client\HelloWorld;

use Spryker\Client\Customer\CustomerDependencyProvider as SprykerCustomerDependencyProvider;
use Spryker\Client\Kernel\Container;

class HelloWorldDependencyProvider extends SprykerCustomerDependencyProvider
{

    const CLIENT_ZED_REQUEST = 'CLIENT_ZED_REQUEST';

    /**
     * @param \Spryker\Client\Kernel\Container $container
     *
     * @return \Spryker\Client\Kernel\Container
     */
    public function provideServiceLayerDependencies(Container $container)
    {
        $container = $this->addZedRequestClient($container);

        return $container;
    }

    /**
     * @param \Spryker\Client\Kernel\Container $container
     *
     * @return \Spryker\Client\Kernel\Container
     */
    protected function addZedRequestClient(Container $container)
    {
        $container[self::CLIENT_ZED_REQUEST] = function (Container $container) {
            return $container->getLocator()->zedRequest()->client();
        };

        return $container;
    }

}

3. To be able to get an instance of HelloWorldStub, create HelloWorldFactory:

<?php

namespace Pyz\Client\HelloWorld;

use Pyz\Client\HelloWorld\Zed\HelloWorldStub;
use Spryker\Client\Kernel\AbstractFactory;

class HelloWorldFactory extends AbstractFactory
{

    /**
     * @return \Pyz\Client\HelloWorld\Zed\HelloWorldStubInterface
     */
    public function createZedStub()
    {
        return new HelloWorldStub($this->getZedRequestClient());
    }

    /**
     * @return \Spryker\Client\ZedRequest\ZedRequestClientInterface
     */
    protected function getZedRequestClient()
    {
        return $this->getProvidedDependency(HelloWorldDependencyProvider::CLIENT_ZED_REQUEST);
    }

}

4. Implement the Client

Now that we have the HelloWorldStub, we can create the Client that consumes this service.

Create the HelloWorldClient Cliend under src/Pyz/Client/HelloWorld together with its corresponding interface.

<?php
namespace Pyz\Client\HelloWorld;

use Spryker\Client\Kernel\AbstractClient;

/**
 * @method \Pyz\Client\HelloWorld\HelloWorldFactory getFactory()
 */
class HelloWorldClient extends AbstractClient implements HelloWorldClientInterface
{
    /**
     *
     * @return \Generated\Shared\Transfer\HelloWorldMessageTransfer
     */
    public function getSalutationMessage()
    {
        return $this->getFactory()
                    ->createZedStub()
                    ->getSalutationMessage();
    }
}

5. Create a controller and a view in Yves

Now that we have everything set up, we can move to Yves and create the controller and the Twig template that will render the random message. Do the following:

1. Under src/Pyz/Yves/HelloWorld/Controller, create IndexController:

<?php
namespace Pyz\Yves\HelloWorld\Controller;

use Spryker\Yves\Kernel\Controller\AbstractController;

/**
 * @method \Pyz\Client\HelloWorld\HelloWorldClientInterface getClient()
 */
class IndexController extends AbstractController
{
    /**
     * @return array
     */
    public function indexAction()
    {

        return [
            'salutationMessage' => $this->getClient()->getSalutationMessage()
        ];
    }

}

2. Under src/Pyz/Yves/HelloWorld/Theme/default/index, create theindex.twig file:

{% extends "@application/layout/layout.twig" %}

{% block content %}
    {{ salutationMessage.value }}
{% endblock %}

6. Set up the URL routing

Now, the only thing left to do is to take care of the URL routing. Do the following:

1. Under src/Pyz/Yves/HelloWorld/Plugin/Route, add HelloWorldRouteProviderPlugin:

<?php
namespace Pyz\Yves\HelloWorld\Plugin\Router;

use Spryker\Yves\Router\Plugin\RouteProvider\AbstractRouteProviderPlugin;
use Spryker\Yves\Router\Route\RouteCollection;

class HelloWorldRouteProviderPlugin extends AbstractRouteProviderPlugin
{
    protected const ROUTE_HELLO_WORD = 'hello-word';

    /**
     * @param \Spryker\Yves\Router\Route\RouteCollection $routeCollection
     *
     * @return \Spryker\Yves\Router\Route\RouteCollection
     */
    protected function addNewProductsRoute(RouteCollection $routeCollection): RouteCollection
    {
        $route = $this->buildRoute('/hello', 'HelloWorld', 'index', 'indexAction');
        $routeCollection->add(static::ROUTE_HELLO_WORD, $route);

        return $routeCollection;
    }
}

2. Register your route provider plugin under RouterDependencyProvider:

protected function getRouteProvider($isSsl)
	  {
		 return [
			//...
			 new HelloWorldRouteProviderPlugin(),
		 ];
	  }

3. Clear cache for routes:

vendor/bin/console router:cache:warm-up

That’s it! https://mysprykershop.com/hello now displays a random salutation message.

ZedRequest header

Since ZedRequest 3.16.0, you can alter the headers sent with each ZedRequest. You can either use the default header plugins or create your own by using the \Spryker\Client\ZedRequestExtension\Dependency\Plugin\HeaderExpanderPluginInterface.

Default header plugins

You can use the following default header plugins:

• \Spryker\Client\ZedRequest\Plugin\AcceptEncodingHeaderExpanderPlugin, adds the Accept-Encoding header to the request.
• \Spryker\Client\ZedRequest\Plugin\AuthTokenHeaderExpanderPlugin, adds the Auth-Token header to the request.
• \Spryker\Client\ZedRequest\Plugin\RequestIdHeaderExpanderPlugin, adds the X-Request-ID header to the request.

These plugins can be added to \Pyz\Client\ZedRequest\ZedRequestDependencyProvider::getHeaderExpanderPlugins().

Create your own header plugin

You can create your own header expander plugin with the \Spryker\Client\ZedRequestExtension\Dependency\Plugin\HeaderExpanderPluginInterface. For example, if you need a header with the name Project-Name, you just create a plugin like this:

<?php

namespace Pyz\Client\ZedRequest\Plugin;

use Spryker\Client\Kernel\AbstractPlugin;
use Spryker\Client\ZedRequestExtension\Dependency\Plugin\HeaderExpanderPluginInterface;

class ProjectNameHeaderExpanderPlugin extends AbstractPlugin implements HeaderExpanderPluginInterface
{
    /**
     * @param array $headers
     *
     * @return array
     */
    public function expandHeader(array $headers): array
    {
        $headers['Project-Name'] = 'My project name';

        return $headers;
    }
}

Once you add this plugin to \Pyz\Client\ZedRequest\ZedRequestDependencyProvider::getHeaderExpanderPlugins(), your new header will be used with every ZedRequest.