Azure Function with HTTP trigger return "received" message before start processing

Question

I'm creating an Azure Function to process files. The Azure Function will be activated with a HTTP Trigger, so the function should be executed whenever a page from a site makes a HTTP request to it.

The Function will take some time to finish processing the files, but I can't get the site waiting for the Function to finish to know If everything was ok. So what I want is some kind of "received" message from the Azure Function just to know that it received the HTTP request, before it starts processing.

Is there any way to do that with a HTTP Trigger? Can I let the caller know that its request was correctly received and, after that, start executing the Azure Function?

Thiago Custodio · Accepted Answer · 2020-04-28 22:36:50Z

3

Yes, it's super easy to do that using Durable Functions:

1- Install 'Microsoft.Azure.WebJobs.Extensions.DurableTask' nuget package;

2-

   [FunctionName("Function1")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
        [DurableClient] IDurableOrchestrationClient starter,
        ILogger log)
    {
        Guid instanceId = Guid.NewGuid();
        string x = await starter.StartNewAsync("Processor", instanceId.ToString(), null);

        log.LogInformation($"Started orchestration with ID = '{instanceId}'.");

        return starter.CreateCheckStatusResponse(req, x);
    }

3-

    [FunctionName("Processor")]
    public static async Task<string> Search([OrchestrationTrigger] IDurableOrchestrationContext context)
    {
        var output= await context.CallActivityAsync<string>("DoSomething", null);

        return output;
    }



   [FunctionName("DoSomething")]
    public static async Task<string> Execute([ActivityTrigger] string termo, ILogger log)
    {
        //do your work in here
    }

In the previous code we're creating an Orchestrator (Processor) function, and it will start an activity which will do the process DoSomething function.

More info: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-overview

answered Apr 28, 2020 at 22:36

Thiago Custodio

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1 Comment

Thiago Custodio Over a year ago

PS: The first function will give you an endpoint that you can check if the process is completed or not

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