In the choreographic programming (CP) paradigm, a single program called a choreography describes the global behavior of a distributed system of nodes. The choreography is then compiled to a collection of node-local programs via endpoint projection. The recent development of library-level choreographic programming, in which choreographies and the projection mechanism are expressed as programs in an existing host language, has the potential to improve the accessibility and practicality of CP by bringing it to mainstream languages.

In this paper, we present ChoRus, a new library-level CP framework for the Rust programming language. ChoRus implements endpoint projection by dynamically injecting customized implementations of choreographic operators depending on the target node. We give a tour of the ChoRus API, discuss the ChoRus approach to endpoint projection, and outline future work for ChoRus and library-level choreographic programming in general.