[Raynos]

I wrote a static config class that reads configuration for the entire app / server from a JSON or YAML file ( https://github.com/uber/zanzibar/blob/master/runtime/static_... ).

Once you've loaded it and mutated it for testing purposes or for copying from ENV vars into the config, you can then freeze it before passing it down to all your app level code.

Having this wrapper object that can be frozen and has a `get()` method to read JSON like data make it effectively not mutable.

[doh]

I use similar pattern myself. Was curious if the OP is using some other, like for instance splitting the struct into two (im/mutable) and then passing them around, or what.

BTW kudos on zanzibar. Love the tech and the code).