I'm trying to get a *new* source from an *existing* sink so I can use the 
source to stream over grpc. I found this example 

  * Materializes into a sink connected to a source, i.e. the sink pushes into 
the source:
  * +----------+       +----------+
  * >   Sink   |------>|  Source  >
  * +----------+       +----------+
  * Should be provided by Akka Streams, see 
val connection: RunnableGraph[(Sink[String, NotUsed], Source[String, NotUsed])] 
    .toMat(Sink.asPublisher[String](fanout = false))(Keep.both)
    .mapMaterializedValue {
      case (sub, pub) => (Sink.fromSubscriber(sub), Source.fromPublisher(pub))

However what I'm trying to do is to take an existing sink that already has 
a source connected to it, and create a new source to which the sink is 

It seems like a legitimate use case but I can't find any way to do it. 

Help would be much appreciated. 


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