Logic App Builtin Async Handling

Description:

Follow this guide to create Wrapper Logic Apps to introduce Async communications for Azure Functions.

UPDATE 2021-05: I would skip this post and read about my Durable Functions post instead. I feel like this may work but it was back when I was first trying to solve a problem I have recently solved with Durable Functions so I would just do that instead. Keeping this here in case someone would rather do this.

To Resolve:

1. Create a Function App in python with a time.sleep(6), call it sleep

   • Using the template here, add a line before the return that sleeps the app for a few seconds.

2. Create a logic app called Async

   • Trigger = Http request
   • Json structure = Paste in the same as the function app, in my case:

   {
      "name": "gerry",
      "car": "mustang",
      "birth": {
      "city": "fort worth",
      "state": "Texas"
      }
   }
   

   • Action: Function App
     • Request body: $body from trigger
   • Action: Response
     • Status Code = 200
     • Headers: Content-Type - application/json
     • Body: $body from function sleep
   • On the Response action, select the ellipses to go to Settings. Turn Asynchronous Response toggle to on.

3. Create a logic app called Controller

   • Trigger = Reoccurance to whenever you want
   • Action: Logic App => Async
     • The inputs will auto show up as city, state, car, and name. Just fill them in with dummy data.

4. Run and you will get a response! It should take 6 seconds if you did time.sleep(6) in step 1. This proves that you can wrap a Logic App around a semi-long running Function App and take advantage of Async HTTP. I have not tested if this goes beyond the 3.9 minutes which will cause it to fail.

   [
      {
      "response": "Hello, gerry.\n\nYou chose dodge.\n\nYour birth city is fort worth in the state of tx",
      "date_time": "2020-12-09-21-13-26"
      }
   ]