How to fix ZIO server Internal Server Error 500 generated buy custom method - scala

Question

I have this 2 methods
import org.h2.store.fs.FilePath
import zio.*
import zio.Console.printLine
import zio.http.Client
import zio.nio.file.*
import zio.nio.charset.Charset
import zio.stream.*
import java.io.IOException
object FileStorage:
def saveToFile(data: String = "", filePath: String = "src/main/resources/data.json"): Unit =
lazy val logic = for {
encoded <- Charset.Standard.utf8.encodeString(data)
path = Path(filePath.split("/").head, filePath.split("/").tail: _*)
notExists <- Files.notExists(path)
- <- if (notExists) Files.createFile(path) else ZIO.attempt(())
_ <- Files.writeBytes(path, encoded)
_ <- Console.printLine(s"written to $path")
} yield ()
def unsafeF = (unsafeVal: Unsafe) => {
implicit val unsafe: Unsafe = unsafeVal
Runtime.default.unsafe.run(logic)
}
Unsafe.unsafe(unsafeF)
def readFromFile: ZIO[Any, Throwable, String] = {
val path = Path("src", "main", "resources", "data.json")
val bool = for bool <- Files.isReadable(path) yield bool
val zioStr = bool.flatMap(bool =>
if (bool) Files.readAllLines(path, Charset.Standard.utf8).map(fileLines => fileLines.head)
else {
saveToFile()
readFromFile})
zioStr
}
In def readFromFile i try to make empty an empty file if file don't exists
File generation working fine
then I'm trying to read that empty file and return it like a ZIO Response like that
import zio.http.{Client, *}
import zio.json.*
import zio.http.model.Method
import zio.{Scope, Task, ZIO, ZIOAppDefault}
import zio.http.Client
import zhttp.http.Status.NotFound
import zhttp.http.Status
import scala.language.postfixOps
import zio._
import scala.collection.immutable.List
import zio.{ExitCode, URIO, ZIO}
object ClientServer extends ZIOAppDefault {
val app: Http[Client, Throwable, Request, Response] = Http.collectZIO[Request]
case Method.GET -> !! / "readLeagues" =>
FileStorage.readFromFile.map(str => Response.json(str))
BUT in this case I getting Internal Server Error 500 on postman in http://localhost:8080/readLeagues
If at first I feed prefilled json file to
def readFromFile
It works fine Status: 200
And I getting a nice looking json as a body
Maybe I should set another default strings for data to prefill
def saveToFile
so json can be parsable?
or smth else