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View Code? Open in Web Editor NEWA Scala validating configuration reader for Typelevel Config.
License: BSD 2-Clause "Simplified" License
A Scala validating configuration reader for Typelevel Config.
License: BSD 2-Clause "Simplified" License
Given something like:
case class Foo(s: String, i: Int, b: Boolean, d: Double, l: Long)
object Foo {
def apply(config: Config): ValidatedNel[Foo] =
(config.as[String]("example.foo.some-string") |@|
config.as[Int]("example.foo.some-int") |@|
config.as[Boolean]("example.foo.some-boolean") |@|
config.as[Double]("example.foo.some-double") |@|
config.as[Long]("example.foo.some-long")).map(Foo.apply)
}
It should be possible to write something like
config.get[Foo]("example")
assuming (initially) the field names match the property names in the config file.
Think this should be doable (neatly) without macros, maybe using Shapeless.
Generic Reader needs lazy schema
implicit def genericReader[A](implicit s: Lazy[Schema[A]]): ConfigReader[A]
= (config: Config, path: String) => s.value.from(config, path)
And
Similarly,
implicit def parsing[K <: Symbol, V, T <: HList](
implicit key: Witness.Aux[K],
next: Schema[T],
mapper: FieldNameMapper = DefaultFieldNameMapper,
reader: Lazy[ConfigReader[V]]): Schema[FieldType[K, V] :: T] = {
Schema.instance { (config, path) =>
val fieldName = key.value.name
val f = reader.value.get(config, path + "." + mapper.replace(fieldName)).map(f => field[K](f))
(f |@| next.from(config, path)).map(_ :: _)
}
}
Add an instance of ConfigReader for enumerations.
Possibly always call cfg.resolve on incoming configuration items so that environment variables are resolved automatically.
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