Python Function App connections using managed identity

Question

Unable to set up connection information for service bus with Python Azure functions for managed identity.

I have the following settings in function.json

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "msg",
      "type": "serviceBusTrigger",
      "direction": "in",
      "queueName": "myinputqueue",
      "connection": "MySvcConn"
    }
  ]
}

and in Application settings in Azure portal i have set

"MySvcConn__fullyQualifiedNamespace":"mysvcns.servicebus.windows.net"

I get the message

"Microsoft.Azure.ServiceBus: Value for the connection string 
parameter name 'mysvcns.servicebus.windows.net' was not found. (Parameter 'connectionString').

Version of Runtime used ~4

host.json configuration

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "excludedTypes": "Request"
      }
    }
  },
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[2.*, 3.0.0)"
  }
}

Answer 1

• To connect to service bus using a managed Identity we have first add servicebus data receiver role to the access control.

• Then add the connection setting to application setting under the name ServiceBusConnection__fullyQualifiedNamespace and add the connection value as <Name_of_servicebus>.servicebus.windows.net .

• The above setting will connect the function app to the service bus using managed identity without the use of connection string.

Refer this documentation

Answer 2

Was able to figure this out, need to set up application settings in function app for the following

ServiceBusConnection__clientID:<managedidenity client id>
ServiceBusConnection__credential:managedidentity
ServiceBusConnection__fullyQualifiedNamespace:<servicebusname>.servicebus.windows.net

"ServiceBusConnection" in the above settings being the connection name in function.json file.