播放2 Scala – 用Iteratee上传大型CSV文件以反应性处理每一行的

我不满意我在第一个组块中跳过http响应头的方式.应该有一种方式来链接这个迭代,第一个迭代器跳过http头并直接切换到完成状态,但是我还没有找到.

如果有人可以帮忙

object ReactiveFileUpload extends Controller {
  def upload = Action(BodyParser(rh => new CsvIteratee(isFirst = true))) {
    request =>
      Ok("File Processed")
  }
}

case class CsvIteratee(state: Symbol = 'Cont,input: Input[Array[Byte]] = Empty,lastChunk: String = "",isFirst: Boolean = false) extends Iteratee[Array[Byte],Either[Result,String]] {
  def fold[B](
               done: (Either[Result,String],Input[Array[Byte]]) => Promise[B],cont: (Input[Array[Byte]] => Iteratee[Array[Byte],String]]) => Promise[B],error: (String,Input[Array[Byte]]) => Promise[B]
               ): Promise[B] = state match {
    case 'Done =>
      done(Right(lastChunk),Input.Empty)

    case 'Cont => cont(in => in match {
      case in: El[Array[Byte]] => {
        // Retrieve the part that has not been processed in the previous chunk and copy it in front of the current chunk
        val content = lastChunk + new String(in.e)
        val csvBody =
          if (isFirst)
            // Skip http header if it is the first chunk
            content.drop(content.indexOf("rnrn") + 4)
          else content
        val csv = new CSVReader(new StringReader(csvBody),';')
        val lines = csv.readAll
        // Process all lines excepted the last one since it is cut by the chunk
        for (line <- lines.init)
          processLine(line)
        // Put forward the part that has not been processed
        val last = lines.last.toList.mkString(";")
        copy(input = in,lastChunk = last,isFirst = false)
      }
      case Empty => copy(input = in,isFirst = false)
      case EOF => copy(state = 'Done,input = in,isFirst = false)
      case _ => copy(state = 'Error,isFirst = false)
    })

    case _ =>
      error("Unexpected state",input)

  }

  def processLine(line: Array[String]) = WS.url("http://localhost:9200/affa/na/").post(
    toJson(
      Map(
        "date" -> toJson(line(0)),"trig" -> toJson(line(1)),"code" -> toJson(line(2)),"nbjours" -> toJson(line(3).toDouble)
      )
    )
  )
}