diaper

Its a wrapper around viper, with some conventions applied:

• this reads config only from dotenv files
• ENV key names are in lowercase
• Ability to add value providers.
• Bring your own struct for validations

Value providers are identified by the prefix in the value. There is no specific criteria for prefix. Default prefix supports are:

• env (implemented)
• ssm (to implement)

To invoke the config loading, the config loader needs some configuration. There are two possible ways to do that.

There are two ways to build the the loaders:

With a providers.yaml

reader, err := os.Open(providersYAMLPath)
assertErr(err, "failed to read file")

providers := diaper.LoadProviders(reader)

loader := diaper.DiaperConfig{
    DefaultEnvFile: "app.env",
    Providers:      providers,
}

Without providers.yaml

providers := diaper.BuildProviders(CustomProvider{})

A Provider, should implement a ValueProvider interface:

func Deref(value interface{}) (computedValue string)

** In all cases, if a Provider cannot dereference a env value, you must return the original value, so that dereferencing can be chained**

Ordering of Providers , In the end there is a NoopProvider, which will always return the original value.