- rework socket pipeline to transform protobuf into case classes and
back
- introduce NetworkOp messages for that purpose
- make API asynchronous (because it is, really) and add Done
notification for all server operations; enter(...) is still
synchronous, because that is its only purpose in life
- factor out mkPipeline in NettyRemoteTransport, enabling the very slick
TestConductorTransport (essentially a one-liner)
- switch NetworkFailureInjector from Channel{Up,Down}streamHandler to
subclassing SimpleChannelHandler, because otherwise deadlocks
occurred, not sure why (but SCH is the recommended way from the netty
docs, so there may well be a reason)
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