CODEWITHSUNDEEP
c#.net-coreazure-durable-functions
Aidan
Aidan

Reputation: 4891

Response bindings for Functions with ActivityTrigger

I want to create a Durable Function that calls an Activity Function, and then returns a value using dotnet core in a v2 function app. The function will of course validate its input, so may return a successful value or it may return an invalid error: a 200 or a 400 in HTTP terms. My activity function will be something like this:

[FunctionName("MyFunc")]
public static async Task<object> Run(
        [ActivityTrigger] string input,
        ILogger log)
{
    // return something like
    return new { Status = "OK", Content = content };
}

What return type should I use for this? Should make my own DTO that would be a valid response, or is there a way of returning HttpResponse objects to the orchestrator?

Upvotes: 1

Views: 1520

Answers (1)

Katy Shimizu
Katy Shimizu

Reputation: 1111

I think there may be a simpler solution here. Have you considered returning a simple value if your verification passes, and throwing an exception handled by the orchestrator if your verification fails?

The ActivityTrigger binding handles both input and output. Per the docs on error handling, an activity function can return any sort of JSON-serializable object to the orchestrator, and unhandled exceptions thrown by an activity function are marshalled back to the orchestrator, where they can be handled by catch blocks.

Activity-orchestrator communication doesn't use HTTP requests and responses; it uses Azure Storage tables to record history events and Azure Storage queues to trigger activities to perform async work or wake up the orchestrator once some activity's async work has completed, respectively. Unless you specifically need an HttpResponse object somewhere in your orchestration, there's no need to wrap your activity's return value in one.

Upvotes: 3

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