IoTHub Connection Strings

[szaroubi]

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Description

After provisioning an IoT Hub and an Azure Function, I would like to set a Function App setting (app_setting) with one of the IoTHub connection strings.

In order to accomplish this, one can generate the connection strings according to this document.
https://blogs.msdn.microsoft.com/iotdev/2017/05/09/understand-different-connection-strings-in-azure-iot-hub/

New or Affected Resource(s)

Not sure, don't know the codebase enough.

Potential Terraform Configuration

resource "azurerm_function_app" "main" {
  name                      = "iot-function-test"
  .
  .
  .
  app_settings{
    IoTHubConnectionString = "${azurerm_iothub.main.eventhubconnectionstring}
  }
}

[szaroubi]

If someone would like to point me in a technical direction, I would like to try to take a crack at it.

[tombuildsstuff]

hey @szaroubi

Thanks for opening this issue / offering to contribute a fix for this :)

Whilst I've not checked the HTTP response, but I believe this should be available as the EventHubEndpoints value in the in properties field within this block - which returns a map[string]*EventHubProperties, which has an Endpoint property (which should be the connection string). It should be possible to add a new Computed (e.g. read-only) field to the schema which returns a list of EventHub Endpoints/Connection String - which will need mapping to an array of strings e.g.

connectionStrings := make([]string, 0)
for _, v := range properties.EventHubEndpoints {
  if v != nil && v.Endpoint != nil {
    connectionStrings = append(connectionStrings, *v.Endpoint)
  }
}

Given this is a complex object - I'd also recommend checking for errors when setting the object in the state too:

if err := d.Set("eventhub_connection_strings", connectionStrings); err != nil {
  return fmt.Errorf("Error flattening `eventhub_connection_strings`: %+v", err)
}

Hope that helps - please let us know if you have any other questions :)

Thanks!

[szaroubi]

Hello @tombuildsstuff ,
Thank you for the very prompt reply.

Seeing I am a total n00b when it comes to building and running the terraform-provier-azurerm project.
Could I ask you to point me to some doc on how to set up my env ?

A part from the README.md file, is there other documentation on how to setup and test this provider (or other providers) with an existing terraform build (or generate a new terraform build)?

[szaroubi]

Here is my PR: #1789

[tombuildsstuff]

hey @szaroubi

Thanks for that PR - that's now been merged and will go out as part of the next release of the AzureRM Provider :)

Thanks!

[tombuildsstuff]

hey @szaroubi

Just to let you know that this has been released in v1.14.0 of the AzureRM Provider which is now available: https://github.com/terraform-providers/terraform-provider-azurerm/blob/v1.14.0/CHANGELOG.md

Thanks!

[ghost]

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