[Haskell-cafe] haskell tcp server

Hello. I'm interested if there exists some library like warp but only for tcp. Or maybe some web page with skeleton for such server or with some variants, eg. concurent/single-threaded. I know that each service can have it's specific properties and realization, but there are many common things left. If it matter — my main task is to create server for protobuf protocol, maybe for such a task there are already created solutions. -- Alexander V Vershilov.