Using envvault with Scala

Note: Please ensure that you have completed the previous steps

Prerequisites

Java Development Kit (JDK) installed
SBT (Scala Build Tool) installed
envvault CLI tool installed
An existing Scala project

Usage

Running Your Application

To run your Scala application with environment variables from envvault:

$ envvault run --env=dev sbt run

Caching Environment Variables

For better performance, you can cache your environment variables:

$ envvault run --env=dev -c -- sbt run

Example Implementation

Here is how to set up a basic Scala web server with envvault:

// Main.scala
import akka.actor.typed.ActorSystem
import akka.actor.typed.scaladsl.Behaviors
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import scala.concurrent.{ExecutionContext, Future}
import scala.sys.env
import scala.util.{Success, Failure}

object Main extends App {
  // Your environment variables are automatically loaded
  val port = env.getOrElse("PORT", "8080").toInt
  val dbUrl = env.getOrElse("DB_URL", "")

  implicit val system: ActorSystem[Nothing] = ActorSystem(Behaviors.empty, "my-system")
  implicit val executionContext: ExecutionContext = system.executionContext

  val route =
    path("") {
      get {
        complete(HttpEntity(ContentTypes.text/plain(UTF-8), "Hello from envvault!"))
      }
    }

  val bindingFuture: Future[Http.ServerBinding] = 
    Http().newServerAt("localhost", port).bind(route)

  bindingFuture.onComplete {
    case Success(binding) =>
      println(s"Server running at http://localhost:$port/")
    case Failure(e) =>
      println(s"Failed to bind to $port: ${e.getMessage}")
      system.terminate()
  }
}

// build.sbt
name := "my-app"
version := "1.0"
scalaVersion := "2.13.8"

libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-http" % "10.2.9",
  "com.typesafe.akka" %% "akka-actor-typed" % "2.6.19",
  "com.typesafe.akka" %% "akka-stream" % "2.6.19"
)