Imperative binding patterns

I don’t know if it is possible but I would like to have a named parameter in my outputbinding like this:

{
  "type": "queue",
  "name": "queueoutput",
  "queueName": "{queuename}",
  "connection": "AzureWebJobsStorage",
  "direction": "out"
}

And have the code decide what queuename to use. Scenario is, rest call in -> route to correct queue which will trigger corresponding function.

Right now I have to add all queue’s declaratively, as you can imagine, it can grow exponentially so having the ability to define the desired queue code would help a lot!

[pragnagopa]

@TylerLeonhardt - I have reopened https://github.com/Azure/azure-functions-host/issues/4207. yes, host should set typedData.json if the input data is infact json.

@bgelens -

Would it be possible if the queue would contain a json body, to refer to a key / nested key?

yes, you can. Please see https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-expressions-patterns#dot-notation

Here is an extension to the above example: Sample input data in queue1

{
  "input": {
    "name":"queue2",
    "Id":"3"
  }
}

Corresponding function.json to bind queuename to input.name for the outputbinding

{
  "bindings": [
    {
      "name": "myQueueItem",
      "type": "queueTrigger",
      "direction": "in",
      "queueName": "queue1",
      "connection": "AzureWebJobsStorage"
    },
    {
      "type": "queue",
      "name": "outputQueueItem",
      "queueName": "{input.name}",
      "connection": "AzureWebJobsStorage",
      "direction": "out"
    }
  ]
}

[pragnagopa]

You will not be able to set queuename for an output binding from within the function code. But Binding expressions allow you to use result from an input binding. Following sample shows how to specify queuename from an output binding from queueTrigger data

{
  "bindings": [
    {
      "name": "myQueueItem",
      "type": "queueTrigger",
      "direction": "in",
      "queueName": "queue1",
      "connection": "AzureWebJobsStorage"
    },
    {
      "type": "queue",
      "name": "outputQueueItem",
      "queueName": "{name}",
      "connection": "AzureWebJobsStorage",
      "direction": "out"
    }
  ]
}

Sample queue trigger data from queue with name queue1

{
  "name": "queue2",
  "Id": "5"
}

Now, you can set value for outputQueueItem for outputbinding which will be pushed to queue with name queue2

Hope this helps!