Add support for Geo-DR Alias in ServiceBus-Triggers

[tohling]

When customer configures a ServiceBus-Trigger with a Geo-DR Alias enabled Service Bus connection string and a failover occurs on Service Bus side, the Function fails to execute and will continuously throw the following error,

Microsoft.ServiceBus.Messaging.MessagingEntityNotFoundException : 40400: Endpoint not found., Resource: {service bus endpoint}

until it is restarted.

Repro steps

Internal ticket. Kindly contact @tohling for more information.

Expected behavior

Function should continue to retrieve and process messages from the failed service bus endpoint.

Actual behavior

The Function fails to executed and will continuously throw the following error,

Microsoft.ServiceBus.Messaging.MessagingEntityNotFoundException : 40400: Endpoint not found., Resource:

Known workarounds

Restart the Function.

[tohling]

@mathewc, @paulbatum - This is more of a feature request to support Geo-DR alias for service bus connection strings.

Based on the documentation, we need to obtain the AliasPrimaryConnectionString through a a new entity known as ServiceBusManagementClient such that the connection string will still work in the event of a failover. Sample code is provided here

https://github.com/Azure/azure-service-bus/blob/master/samples/DotNet/Microsoft.ServiceBus.Messaging/GeoDR/TestGeoDR/ConsoleApp1/Program.cs

[tohling]

@mathewc - Actually, the customer can provide the correct alias-based connection string upfront in their setup. However, this is a relatively new feature (GA'd in Dec 2017) that is likely not a part of the ServiceBus SDK that V1 is using, so it may just work with the V2 Runtime. We'll need to test this use-case to confirm.

Separately, I have asked the customer to try V2. Will update this thread when I get more information.

[mathewc]

Thanks Ling :)

[fabiocav]

@tohling will you let us know when you have an update on this? Moving this to active questions for now.

[AdiThakker]

@tohling : Is there any update on this? Should i look anywhere else for more information. Appreciate the feedback. I am currently looking at the Service Bus Extensions sdk and will next look into the functions runtime to see if I can find more information.