Hello hAkkers, It's me again. Is it possible to know when outgoing
connection will be closed and then complete closeConn promise or throw
failure in flow context? Without closeConn promise I can't work with idle
stream.
This is an example for issue:
```
val serverAddress = new InetSocketAddress("coreos", 2375)
val closeConn = Promise[ByteString]()
val source = Source(closeConn.future).drop(1) // as an example. In the
real application, source is a WS endless stream of commands from user.
Tcp()
.outgoingConnection(serverAddress)
.runWith(source, Sink.foreach(println))
```
When outgoing connection has been closed then I saw a debug message "Read
returned end-of-stream, our side not yet closed". How to avoid this kind of
leak?
I did try to add StatefulStage to tcp stream and watch on onUpstreamFinish:
```
class CloseStage extends StatefulStage[ByteString, ByteString] {
def initial: State = new State {
def onPush(elem: ByteString, ctx: Context[ByteString]):
SyncDirective =
ctx.push(elem)
def onUpstreamFinish(ctx: Context[ByteString]):
TerminationDirective = {
println("onUpstreamFinish")
???
}
}
}
Tcp()
.outgoingConnection(serverAddress)
.transform(() => new CloseStage())
.runWith(source, Sink.foreach(println))
```
But nothing happened.
Am I right?
Thank you.
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