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• Env.scala

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com.malliina.config.Env.scala Maven / Gradle / Ivy

package com.malliina.config

import cats.data.NonEmptyList
import com.malliina.values.Readable

object Env extends ValueReader(sys.env.get)

abstract class ValueReader(readString: String => Option[String]) {
  def readOrElse[T: Readable](key: String, default: => T): Either[InvalidValue, T] =
    read(key).left.flatMap {
      case mv: MissingValue => Right(default)
      case iv: InvalidValue => Left(iv)
    }
  def read[T](key: String)(implicit r: Readable[T]): Either[ConfigError, T] =
    readString(key)
      .toRight(new MissingValue(NonEmptyList.of(key)))
      .flatMap { str =>
        r.read(str).left.map(err => new InvalidValue(err, NonEmptyList.of(key), None))
      }
}