Add azure events trigger type

Description

Add a new type of trigger mechanism that is an Azure webhook-triggered event

Further details

A new type of event trigger should be created that allows FaaS functions to be triggered from Azure events.

If this event trigger type is configured a "service principal" GUID that will be authenticated to make the webhook calls must also be provided.

When this event trigger type is configured the module should deploy:

• The required resources for all FaaS including:
  • The FaaS function itself
  • The triggering PubSub topic and subscription
• An event bridge service
  • Configured with any required values for authentication
  • Configured with the triggering PubSub topic to write events to

The module should include in it's output variables the webhook-able endpoint exposed by event bridge service.

The module should also configure alerts for

• uptime of the event bridge service
• 5XX responses sent by the service
• Logs for authentication failure of service principal GUID

The module is not responsible for providing any Azure resources, only exposing a usable webhook endpoint from the GCP environment.

Task list

• Update module to configure this event trigger type
• Deploy to the dev environment for testing
• Ensure webhook service tested against an Azure event grid in the uniofcamdev Azure tenancy (re-using resources created in #16 (closed))

Acceptance criteria

• Module updated to allow for Azure webhook compatible endpoint as the trigger mechanism for ucam-faas

Links/references