Rcontext is a immutable context to carry around in the processing of a network request, or any other asynchronous task. It can carry around cross-cutting concerns such as deadlines, tracing information, timing information, debugging tags, etc.
At its core, a Rcontext.t is a wrapper around hmap,
alongside a set of standard hmap keys.
Each key provides access to some specific information (deadline, timing information, etc.)
The hope is that this can be a lightweight dependency for projects that need to carry this kind of information around, and to help standardize keys. [Rcontext] relies on dune's alternative dependencies to use optional dependencies for standard keys, instead of hard dependencies.
MIT