override def initialAttributes = Attributes.name()

in runtime/src/main/scala/org/apache/pekko/grpc/internal/DecodeBase64.scala [39:85]

39 lines of code
6 McCabe index (conditional complexity)


  override def initialAttributes = Attributes.name("DecodeBase64")

  final override val shape = FlowShape(in, out)

  override def createLogic(inheritedAttributes: Attributes): GraphStageLogic =
    new GraphStageLogic(shape) with InHandler with OutHandler {
      private var buffer: ByteString = ByteString.empty

      override def onPush(): Unit = {
        buffer ++= grab(in)

        val length = buffer.length
        val decodeLength = length - length % 4

        if (decodeLength > 0) {
          val (decodeBytes, remaining) = buffer.splitAt(decodeLength)
          push(out, decodeBytes.decodeBase64)
          buffer = remaining
        } else {
          pull(in)
        }
      }

      override def onUpstreamFinish(): Unit = {
        if (buffer.nonEmpty) {
          if (isAvailable(out)) {
            push(out, buffer.decodeBase64)
            buffer = ByteString.empty
          }
        } else {
          completeStage()
        }
      }

      override def onPull(): Unit = {
        if (isClosed(in)) {
          if (buffer.nonEmpty) {
            push(out, buffer.decodeBase64)
            buffer = ByteString.empty
          } else {
            completeStage()
          }
        } else pull(in)
      }

      setHandlers(in, out, this)
    }