NewHubWithNamespaceNameAndEnvironment hangs when expected env vars aren't provided

[colmsnowplow]

Expected Behavior

When no valid combination of env vars are provided, I expect this method to throw an error.

Actual Behavior

When none of the env vars to authenticate (eg EVENTHUB_KEY_NAME, EVENTHUB_KEY_VALUE) are provided - or one is missing - the program will just hangs indefinitely.

Handling this is a bit of an inconvenience since there are quite a few possible combinations of env vars that can be used to authenticate.

I have also noticed that it'll hang when you set EVENTHUB_CONNECTION_STRING to a value that isn't a valid format for connection string - but not when a fake value of the correct format is supplied.

It won't hang if you provide a valid set of env vars, but they're fake values.

I haven't tested this with the other NewHub methods, but I presume the same will happen for anything that uses env vars.

repro:

package main

import (
	"fmt"
	"os"

	eventhub "github.com/Azure/azure-event-hubs-go/v3"
)

func main() {

	os.Unsetenv("EVENTHUB_KEY_NAME")
	os.Unsetenv("EVENTHUB_KEY_VALUE")

	os.Unsetenv("EVENTHUB_CONNECTION_STRING")

	os.Unsetenv("AZURE_TENANT_ID")
	os.Unsetenv("AZURE_CLIENT_ID")

	os.Unsetenv("AZURE_CLIENT_SECRET")

	os.Unsetenv("AZURE_CERTIFICATE_PATH")
	os.Unsetenv("AZURE_CERTIFICATE_PASSWORD")

	hub, err := eventhub.NewHubWithNamespaceNameAndEnvironment("EventHubNamespace", "EventHubName")

	fmt.Println(err)
	fmt.Println(hub)

}