I'm currently working on something that does that sort of thing. https://github.com/djherbis/fscache https://github.com/djherbis/fscache It doesn't have the co

I'm currently working on something that does that sort of thing. https://github.com/djherbis/fscache https://github.com/djherbis/fscache It doesn't have the composability features yet, but it already handles 1 writer with many concurrent readers. Let me know if that helps!