Default to EMERGENCY_BANNER_REDIS_URL in Emergency Banner controller
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This is a new environment variable we've currently added to Integration to allow us to switch Whitehall to a new Redis instance. For environments that don't have this variable set yet (i.e. Staging and Production) we fallback on the default `REDIS_URL`. This is temporary - once we've moved all environments over to the new URL we can remove this default. `mock_env` is shamelessly copied from [here](https://gist.github.com/jazzytomato/79bb6ff516d93486df4e14169f4426af) and allows us to specify some environment variables that won't persist between tests. I'd probably extract this to a helper for future use but this is a temporary change that we'll remove fairly soon.
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brucebolt
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Sep 26, 2024
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Trello card
In alphagov/govuk-helm-charts@5011635 we added a new
EMERGENCY_BANNER_REDIS_URLenvironment variable to Whitehall Admin on Integration pointing to the newly-provisioned Redis instance's database (/1).Here we access that value in the Emergency Banner controller.
For environments that don't have this variable set yet (i.e. Staging and Production) we fallback on the default
REDIS_URL.This is temporary - once we've moved all environments over to the new URL we can remove this default.
NB: We'll need to deploy the corresponding change in Static's codebase at the same time as this one to ensure the two are using the same shared instance
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