"PanicError: Cannot assign ActivityProxy" while running workflow containing signal methods

Community Support
1

Hi all,

I get a PanicError while running workflow containing signal methods.
Full error text:

PanicError: Cannot assign Temporal\Internal\Workflow\ActivityProxy to property App\Workflow\GenerationWorkflow::$generateActivity of type App\Activity\GenerateActivityInterface (type: TypeError, retryable: true) 
process event for default [panic]:
github.com/temporalio/roadrunner-temporal/workflow.(*process).OnWorkflowTaskStarted(0xc000a9f1d0, 0xc000838900?)
	github.com/temporalio/roadrunner-temporal@v1.3.4/workflow/workflow.go:159 +0x2cb
go.temporal.io/sdk/internal.(*workflowExecutionEventHandlerImpl).ProcessEvent(0xc00000c8b8, 0xc0008e7400, 0x20?, 0x1)
	go.temporal.io/sdk@v1.14.0/internal/internal_event_handlers.go:815 +0x203
go.temporal.io/sdk/internal.(*workflowExecutionContextImpl).ProcessWorkflowTask(0xc000472000, 0xc00014f2c0)
	go.temporal.io/sdk@v1.14.0/internal/internal_task_handlers.go:878 +0xca8
go.temporal.io/sdk/internal.(*workflowTaskHandlerImpl).ProcessWorkflowTask(0xc000b520b0, 0xc00014f2c0, 0xc00093b350)
	go.temporal.io/sdk@v1.14.0/internal/internal_task_handlers.go:727 +0x485
go.temporal.io/sdk/internal.(*workflowTaskPoller).processWorkflowTask(0xc000b32410, 0xc00014f2c0)
	go.temporal.io/sdk@v1.14.0/internal/internal_task_pollers.go:284 +0x2cd
go.temporal.io/sdk/internal.(*workflowTaskPoller).ProcessTask(0xc000b32410, {0x15a86a0?, 0xc00014f2c0?})
	go.temporal.io/sdk@v1.14.0/internal/internal_task_pollers.go:255 +0x6c
go.temporal.io/sdk/internal.(*baseWorker).processTask(0xc000830000, {0x15a8260?, 0xc0008128b0})
	go.temporal.io/sdk@v1.14.0/internal/internal_worker_base.go:398 +0x167
created by go.temporal.io/sdk/internal.(*baseWorker).runTaskDispatcher
	go.temporal.io/sdk@v1.14.0/internal/internal_worker_base.go:302 +0xb5

Here is the workflow interface code:

use Temporal\Workflow\SignalMethod;
use Temporal\Workflow\WorkflowInterface;
use Temporal\Workflow\WorkflowMethod;

#[WorkflowInterface]
interface GenerationWorkflowInterface
{
    #[WorkflowMethod]
    public function generate(string $config, int $bidFactor);

    #[SignalMethod]
    public function pause();

    #[SignalMethod]
    public function resume();
}

Code of the workflow implementation:

use App\Activity\GenerateActivityInterface;
use App\Services\Timer;
use Carbon\CarbonInterval;
use Temporal\Activity\ActivityOptions;
use Temporal\Workflow;

class GenerationWorkflow implements GenerationWorkflowInterface
{
    private GenerateActivityInterface $generateActivity;
    private Timer $timer;

    public function __construct()
    {
        $this->timer = new Timer();

        $this->generateActivity = Workflow::newActivityStub(
            GenerateActivityInterface::class,
            ActivityOptions::new()
                ->withStartToCloseTimeout(CarbonInterval::seconds(30))
        );
    }

    public function generate(string $config): \Generator
    {
        yield $this->generateActivity->generate($config);
    }

    public function pause()
    {
        $this->timer->pause();
    }

    public function resume()
    {
        $this->timer->resume();
    }
}

If I remove signal methods pause() and resume() from GenerationWorkflow and GenerationWorkflowInterface, the worflow runs fine without any errors. But with these methods I get PanicError right after workflow start (even if I’m not sending any signals to this workflow). Can you help me, what am I doing wrong? Thanks in advance!

2

Hey Inessa_M :wave:

Could you please update PHP-SDK and RoadRunner to the latest stable versions?

3

Hi!

Due to PHP limitations he activity proxy does not implements your interface. Remove type from your workflow property and it should work. IDE suggestions should still work.

4

Thanks @Wolfy-J , @rustatian ! I removed type from my workflow property declaration and it works fine.