Not very online today, may look into it in more depth tomorrow but at a
glance it seems that you complete the connection too eagerly: instead of
Source.empty use Source.maybe (does not immediately send completion;
completion == closing the connection).
Also, you don't need the GraphDSL, you can simply from.via(thingy) etc.
Hope that's it, if not let me know and will have a proper look tomorrow.
Cheers
--
Konrad Malawski
From: debasish <ghosh.debas...@gmail.com> <ghosh.debas...@gmail.com>
Reply: akka-user@googlegroups.com <akka-user@googlegroups.com>
<akka-user@googlegroups.com>
Date: 16 July 2016 at 21:59:30
To: Akka User List <akka-user@googlegroups.com> <akka-user@googlegroups.com>
Subject: [akka-user] problem connecting with TCP for file IO
Hi -
>
> I am using akka-stream 2.4.8 for a use case which used to work properly
> with earlier version of akka-stream (1.x). It has a client that connects
> over TCP, streams a csv file to a server. The server receives the stream,
> parses the csv record and builds some domain object.
>
> The issue that I am facing right now is that the server starts
> successfully. But when I run the client I get exceptions like
> Failure(akka.stream.StreamTcpException:
> The connection closed with error: Connection reset by peer).
>
> Here's the client code ..
>
> object Client extends App with Logging {
> implicit val system = ActorSystem("client")
> val serverConnection = Tcp().outgoingConnection("127.0.0.1", 9982)
> val path =
> "/Users/debasishghosh/projects/frdomain/src/main/resources/transactions.csv"
> val readLines =
> FileIO.fromPath(Paths.get(path))
> .via(Framing.delimiter(ByteString(System.lineSeparator),
> maximumFrameLength = 512, allowTruncation = true))
> val logWhenComplete = Sink.onComplete(r => logger.info("Transfer
> complete: " + r))
> val graph = RunnableGraph.fromGraph(GraphDSL.create() { implicit b =>
> import GraphDSL.Implicits._
> readLines ~> serverConnection ~> logWhenComplete
> ClosedShape
> })
> implicit val mat = ActorMaterializer()
> graph.run()
> }
>
> ..and here's the server code ..
>
> class Server(host: String, port: Int)(implicit val system: ActorSystem)
> extends Logging {
> def run(): Unit = {
> implicit val mat = ActorMaterializer()
> logger.info(s"Receiver: binding to $host:$port")
> Tcp().bind(host, port).runForeach { conn =>
> val receiveSink =
> conn.flow
> .via(Framing.delimiter(ByteString(System.lineSeparator),
> maximumFrameLength = 512, allowTruncation = true)).map(_.utf8String)
> .map(_.split(","))
> .mapConcat(Transaction(_).toList)
> .to(Sink.foreach[Transaction](println(_)))
> receiveSink.runWith(Source.empty)
> }
> }
> }
>
> object Server extends App {
> implicit val system = ActorSystem("processor")
> new Server("127.0.0.1", 9982).run()
> }
>
>
> Any help will be appreciated. I have attached the full files for client
> and server in case you want to run. The file path is currently hardcoded
> and needs to be changed there.
>
> Thanks.
>
> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
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