ZIO learning - using standard ZIO config system with external provider / published by https://github.com/dacr/code-examples-manager #8c63c270-2be2-4bdf-ae7d-856768bb3a89/12255d5456e81868fdbf76f09c7f1d30c53bd2b7

zio-learning-config-5.sc

// summary : ZIO learning - using standard ZIO config system with external provider
// keywords : scala, zio, learning, pure-functional, typesafeconfig, config, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 8c63c270-2be2-4bdf-ae7d-856768bb3a89
// created-on : 2023-04-28T08:23:40+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "dev.zio::zio-config:4.0.0-RC14"
//> using dep "dev.zio::zio-config-typesafe:4.0.0-RC14"
//> using dep "dev.zio::zio-config-magnolia:4.0.0-RC14"
// ---------------------

import zio.*

import zio.config.*
import zio.config.typesafe.*
import zio.config.magnolia.*

case class DatabaseConfig(
  name: String,
  host: String,
  port: Int
)

object DatabaseConfig {
  val config: Config[DatabaseConfig] = deriveConfig[DatabaseConfig].mapKey(toKebabCase).nested("database")
}

object Encapsulated extends ZIOAppDefault {
  // -------------------------------------------------------------
  val configProvider =
    ConfigProvider.fromHoconString(
      input = s"""database {
                 |  name = exampleDB
                 |  host = localhost
                 |  port = 43
                 |}
                 |""".stripMargin
    )

  override val bootstrap: ZLayer[ZIOAppArgs, Any, Any] =
    Runtime.setConfigProvider(configProvider)

  // -------------------------------------------------------------
  val logic = for {
    myConf <- ZIO.config(DatabaseConfig.config)
    _      <- Console.printLine(myConf)
  } yield ()

  // -------------------------------------------------------------
  override def run = {
    logic
  }

}

Encapsulated.main(Array.empty)