iSCSI target implementation is User Space

I want to write my own implementation of iSCSI target where in I want to interrupt read/write calls to block device and serve them from my custom storage implementation. Is there any default library(preferably in GOLANG/Python) which gives this ability for an application running in user space. Note: This implementation is similar to fuse but I want to avoid fuse and directly integrate my storage in iSCSI target implementation.