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package byspel
package app
import akka.actor.ActorSystem
import akka.stream.{ActorMaterializer, Materializer}
import java.nio.file.{Files, Paths}
import scala.concurrent.ExecutionContext
import toml.Toml
trait App {
implicit lazy val system: ActorSystem = ActorSystem()
implicit lazy val materializer: Materializer = ActorMaterializer()
implicit lazy val executionContext: ExecutionContext = system.dispatcher
def start(): Unit = {}
def stop(): Unit = {}
def log(msg: String) = System.err.println(msg)
private var _args: List[String] = Nil
def args = _args
lazy val config = args match {
case Nil =>
log("fatal: no config file given as first argument")
sys.exit(1)
case head :: _ if Files.isReadable(Paths.get(head)) =>
log(s"loading config from '${args(0)}'")
import toml.Codecs._
val str = new String(Files.readAllBytes(Paths.get(head)), "utf-8")
Toml.parseAs[Config](str) match {
case Left(err) =>
log(s"fatal: syntax error in config file: $err")
sys.exit(1)
case Right(value) => value
}
case head :: _ =>
log(s"fatal: config file '$head' is not readable or does not exist")
sys.exit(1)
}
def main(args: Array[String]): Unit = {
log("starting application")
_args = args.toList
config
sys.addShutdownHook {
log("stopping application")
stop()
log("bye")
}
start()
log("ready")
}
}
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