Question 1

How to use Hush with Google Cloud Secret Manager in Elixir?

Accepted Answer

Add the hush_gcp_secret_manager dependency, configure it in your config files to load at startup, and use the {:hush, GcpSecretManager, "key"} tuple. Ensure GCP credentials are properly set up via environment variables or service accounts.

Question 2

Hush vs Distillery config providers: which is better for releases?

Accepted Answer

Hush is a modern alternative that integrates natively with Elixir's Config.Provider, offering more flexibility with multi-source support and type casting. Distillery providers are older and may have limited features compared to Hush's extensible architecture.

Question 3

How to handle errors when a secret is missing in Hush?

Accepted Answer

By default, Hush raises an error. To prevent this, mark the configuration as optional: true or provide a default value in the options, such as {:hush, SystemEnvironment, "KEY", default: "fallback"}.

Question 4

Can I use Hush without Elixir releases?

Accepted Answer

Yes, Hush can be loaded at runtime in the application start function, but its primary value is in release mode where configuration isn't known at compile time. For non-release setups, simpler env var approaches might suffice.

Question 5

How to write a custom transformer for JSON parsing in Hush?

Accepted Answer

Implement the Hush.Transformer behaviour with key/0 returning :json and transform/2 that uses Jason.decode! or similar. Then, configure it in hush's transformers list and use it in options like [json: true].

Question 6

Does Hush support real-time configuration updates?

Accepted Answer

No, Hush focuses on loading configuration at application startup or via providers in releases. For dynamic updates, you'd need to implement custom logic, as Hush's cache is short-lived (default 5000ms) and doesn't support hot reloads.

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