Hi. I'm trying to start with Spryker but unfortunately having troubles at very beginning. In develop

U01NZPTR6P8

Hi. I'm trying to start with Spryker but unfortunately having troubles at very beginning. In developer bootcamp, there is a challenge to communicate Yves with Zed. I implemented everything mentioned in description, but calling Yves endpoint I got following error:

"RuntimeException: Controller 'Pyz\Zed\Unixslayer\Communication\Controller\GatewayController::reverseAction()' requires that you provide a value for the '$transfer' argument. Either the argument is nullable and no null value has been provided, no default value has been provided or because there is a non optional argument after this one. in file /data/vendor/symfony/http-kernel/Controller/ArgumentResolver.php on line 80"

After investigating a bit deeper, I found that request, which is send to Zed is created with empty stream. Followup with objects dumped right before Zed call.

Spryker\Client\ZedRequest\Client\Request {#1138
  #values: array:8
    "host" => "a04cc4aa7478"
    "metaTransfers" => array:2
      "locale" => array:2
        "data" => array:4
          "locale_name" => "en_US"
          "id_locale" => null
          "name" => null
          "is_active" => null
        ]
        "className" => "Generated\Shared\Transfer\LocaleTransfer"
      ]
      "currency" => array:2
        "data" => array:6
          "code" => "EUR"
          "symbol" => "€"
          "id_currency" => null
          "name" => "Euro"
          "is_default" => true
          "fraction_digits" => 2
        ]
        "className" => "Generated\Shared\Transfer\CurrencyTransfer"
      ]
    ]
    "password" => null
    "sessionId" => "7cc997352356cbd15bf0546716418b5e"
    "time" => "1616096479"
    "transfer" => array:1
      "original_string" => "Hello world!"
    ]
    "transferClassName" => "Generated\Shared\Transfer\StringReverseTransfer"
    "username" => null
  ]
}

GuzzleHttp\Psr7\Request {#1161
  -method: "POST"
  -requestTarget: null
  -uri: GuzzleHttp\Psr7\Uri {#1160
    -scheme: "http"
    -userInfo: ""
    -host: "zed.us.spryker.local"
    -port: null
    -path: "/unixslayer/gateway/reverse"
    -query: ""
    -fragment: ""
  }
  -headers: array:6
    "Host" => array:1
      0 => "zed.us.spryker.local"
    ]
    "User-Agent" => array:1
      0 => "Yves 2.0"
    ]
    "X-Yves-Host" => array:1
      0 => "1"
    ]
    "X-Internal-Request" => array:1
      0 => "1"
    ]
    "Auth-Token" => array:1
      0 => "JDJ5JDA0JElvOC96LzEuVEltYnhHYVRXdFgwY09aR01GVy9hYVpybktleGJFLnJZUVRORzJSWTE4Zmc2"
    ]
    "X-Request-ID" => array:1
      0 => "7bb946bc"
    ]
  ]
  -headerNames: array:6
    "user-agent" => "User-Agent"
    "x-yves-host" => "X-Yves-Host"
    "x-internal-request" => "X-Internal-Request"
    "auth-token" => "Auth-Token"
    "x-request-id" => "X-Request-ID"
    "host" => "Host"
  ]
  -protocol: "1.1"
  -stream: null
}

Unknown

hey! Sorry for getting back to you so late. Can you show the GatewayController you created? and also the ZedStub?

U01NZPTR6P8

@UJN2JRU4F
GatewayController: https://gist.github.com/unixslayer/3ef6d521479a62dbde5a17b9ca985111
ZedStub: https://gist.github.com/unixslayer/222573d65419ecd647b29cbc6e5f5fcb

U01NZPTR6P8

@UJN2JRU4F looks like no $argumentValueResolvers are passed into \Symfony\Component\HttpKernel\Controller\ArgumentResolver so it takes default ones and none of them could resolve gateway argument from the request. I saw two implementations of \Symfony\Component\HttpKernel\Controller\ArgumentValueResolverInterface in Spryker codebase. How exactly is Symfony components configured in Spryker? Is Spryker using autowire/autoconfig?

Unknown

hi

Unknown

no autowire/autoconfig by any means

Unknown

gateway controller looks fine

Unknown

stub as well

Unknown

let’s follow the chain further

Unknown

my line of thought: this is a very frequently done and rather mature task, so the basic configuration is likely correct, otherwise people would stumble often. so there is probably some detail off.

Unknown

following a principle from the Pragmatic Programmer: “If you see hoof prints think horses, not zebras. ” 😊

Unknown

so, now we have to find out where the Stub is actually used. Following the error message, this would probably be the controller

U01NZPTR6P8

I'll follow the rabbit hole and return to you with the results 😉

Unknown

You could also share a gut diff with your code or so 😊

U01NZPTR6P8

@UJN2JRU4F Turned out that my GatewayController extends AbstractController instead of AbstractGatewayController. Everything started to work as expected after change. I was trying to debug this issue more further but decided to go again with the example and copy/paste code samples from training and checking if I did something different. At first attempt I was writing the code by my own.

Unknown

happens 🤷

Unknown

do you have any suggestion what might have helped you identify or even prevent the mistake from our side?

U01NZPTR6P8

For this case? Maybe in tutorial you can emphasize that there is a difference between AbstractController and AbstractGatewayController. I read the description, made a brief look at GatewayController and started to code. Going with copy/paste I could not even notice that. AbstractGatewayController works differently from AbstractController although implementations are made in the same namespace which can be a bit confusing. I think that this should be explained somewhere.

U01NZPTR6P8

I just noticed, that actions in AbstractGatewayControllers can only accept TransferObjects so it works totally different from AbstractControllers . Took a quick look at documentation, but I don't see any explanation, that they have specific purpose.

Unknown

the gateway controllers?

Unknown

this is indeed the closes thing i found (after 5 mins of search) https://documentation.spryker.com/docs/client#requests-from-yves-to-zed

U01NZPTR6P8

@UJN2JRU4F it still doesn't explain the difference between GatewayController and standard Controller. But I guess that this might not be that much of a problem if this is the first time someone had this issue. On the other hand, it could be helpful to point out the purpose and how GatewayControllers actually works.

Unknown

agreed