Thoth is an example Swift Package to showcase the possibility of centralising your app's configuration objects into something that can be shipped sepearately, if required.

Install via Swift Package Manager.

You're going to want to fork Thoth so you can add your own configuration.

Then add the following to the dependencies in your Package.swift:

.package("https://github.com/<your fork>/thoth.git", .branch("master"))

Or in Xcode: File -> Swift Packages -> Add Package Dependency.

If you want to deploy to an S3 bucket make sure you install the AWS CLI and have setup an account and bucket.

• Fork Thoth.
• Change the URL and refresh interval in Thoth.swift to whatever you like
• Add your own configuration structure to Sources/Config/

Important: Make sure your properties are mutable (i.e. use var and not let), otherwise Codable will not synthesize decoding of those properties and all this is for naught.

• Add the Thoth package as a dependency within your app.

• Call Thoth.shared.<keyPath> to access your configuration.

• Thoth will automatically refresh from the URL as appropriate.

• If you're using SwiftUI, Thoth implements ObservableObject, so you can use it with @ObservedObject to react to changes.

• Update the properties in the Makefile for your AWS deployment.

1. Run make. The Thoth Builder will JSONEncoder your Config structure and output it to .export/thoth.json.
2. Run make test. Swift will run the tests you add to ConfigTests (you did add tests right? :P)
3. Run make deploy. The AWS CLI will sync your exported thoth.json to the configured S3 bucket ready for access by your app.
4. Bonus: If you want to run this as a GitHub action, install Docker Desktop for Mac and you can use make linux-test to ensure your Config and everything passes tests on the Linux version of Swift.

The Thoth class is a wrapper around your Config object. It implements @dynamicMemberLookup to pass through property lookups to your Config object, while refreshing the config as appropriate.

The Thoth.Constants enum has a number of properties you can tweak as you need, including:

• url: The URL to your thoth.json file.
• refreshGranularity: A Calendar.Component-based frequency to refresh at. Thoth refreshes when this component changes using Calendar.compare(_:to:toGranularity:). So if it is set to Calendar.Component.day, then Thoth will refresh once when the date changes.
• cacheFilename: The filename for Thoth to cache its configuration in your app's Library/ Caches folder.

Put your config in here. You can use whatever structure you like as long as everything is Codable and is a public var.

If you don't make it public it won't be accessable from your app, and if you don't make it mutable (var) then it cannot be updated from the JSON.

This is used for building, testing and deploying Thoth JSON files. The commands are listed above in Deploying Config JSON.

The following variables can be configured in your Makefile:

• BUCKET: The S3 bucket you want to deploy your thoth.json to.
• REGION: The AWS region the bucket lives in.
• PROFILE: The profile you've configured for the AWS CLI. If you've installed it fresh and only added one account this is probably Default.

Thoth also includes an example GitHub action. This means that, on push, GitHub will run swift test on your Config, and if they pass, deploy the thoth.json to the bucket directly.

See .github/workflows/swift.yml for more.