Modules

The following sections describe the additional modules.

Circe

The ciris-circe module provides ConfigDecoders for JSON using Circe.

import ciris._
import ciris.circe._
import io.circe.Decoder

case class SerialNumber(value: String)

object SerialNumber {
  implicit val serialNumberDecoder: Decoder[SerialNumber] =
    Decoder[String].map(apply)

  implicit val serialNumberConfigDecoder: ConfigDecoder[String, SerialNumber] =
    circeConfigDecoder("SerialNumber")
}

env("SERIAL").as[SerialNumber]
// res0: ConfigValue[Effect, SerialNumber] = ConfigValue$1576271232

Circe YAML

The ciris-circe-yaml module provides ConfigDecoders for YAML using circe-yaml.

import ciris._
import ciris.circe.yaml._
import io.circe.Decoder

case class SerialNumber(value: String)

object SerialNumber {
  implicit val serialNumberDecoder: Decoder[SerialNumber] =
    Decoder[String].map(apply)

  implicit val serialNumberConfigDecoder: ConfigDecoder[String, SerialNumber] =
    circeYamlConfigDecoder("SerialNumber")
}

env("SERIAL").as[SerialNumber]
// res2: ConfigValue[Effect, SerialNumber] = ConfigValue$780221671

Enumeratum

The ciris-enumeratum module provides ConfigDecoders for Enumeratum enumerations.

For regular Enums, also mix in CirisEnum to derive a ConfigDecoder instance.

import ciris.env
import enumeratum.{CirisEnum, Enum, EnumEntry}
import enumeratum.EnumEntry.Lowercase

sealed trait Suit extends EnumEntry with Lowercase

object Suit extends Enum[Suit] with CirisEnum[Suit] {
  case object Clubs extends Suit
  case object Diamonds extends Suit
  case object Hearts extends Suit
  case object Spades extends Suit

  val values = findValues
}

env("SUIT").as[Suit]
// res4: ciris.ConfigValue[ciris.package.Effect, Suit] = ConfigValue$787821886

For ValueEnums, also mix in the matching CirisValueEnum to derive a ConfigDecoder instance.

import ciris.env
import enumeratum.values.{StringCirisEnum, StringEnum, StringEnumEntry}

sealed abstract class Color(val value: String) extends StringEnumEntry

object Color extends StringEnum[Color] with StringCirisEnum[Color] {
  case object Red extends Color("red")
  case object Green extends Color("green")
  case object Blue extends Color("blue")

  val values = findValues
}

env("COLOR").as[Color]
// res6: ciris.ConfigValue[ciris.package.Effect, Color] = ConfigValue$824759191

Http4s

The ciris-http4s module provides ConfigDecoders for the http4s Uri type.

import ciris.env
import ciris.http4s._
import org.http4s.Uri

env("URI").as[Uri]
// res8: ciris.ConfigValue[ciris.package.Effect, Uri] = ConfigValue$65883788

Refined

The ciris-refined module provides ConfigDecoders for refined refinement types.

import ciris.env
import ciris.refined._
import eu.timepit.refined.types.numeric.PosInt

env("POS_INT").as[PosInt]
// res10: ciris.ConfigValue[ciris.package.Effect, PosInt] = ConfigValue$606878738

Squants

The ciris-squants module provides ConfigDecoders for squants quantities.

import ciris.env
import ciris.squants._
import squants.market.Money

env("MONEY").as[Money]
// res12: ciris.ConfigValue[ciris.package.Effect, Money] = ConfigValue$595042668
← Configurations