Error Detail wrappers
This project provides wrappers around googleapis/rpc/errdetails types, as well as an error type wrapping gRPC status codes.
An error created or wrapped by this package can be unwrapped and transcribed to a Status message type with all the added details intact.
Until inspiration strikes again, all the errors contained herein are derivative of Google's errdetails messages.
Consider unwrapping these errors to enrich logs as well, they're genuinely useful constructs for everyday purposes.
Why, though?
Story time.
We never utilized the WithDetails functionality of gRPC Status messages, or even *status.Status at all, preferring instead to use regular old errors with a translation layer in middleware.
There's so much more knowledge you can express in a Status response coming right from your API layer though, and I wished for some way to make the Status message and arbitrary details more palatable to a team already familiar with error wrapping.
At the same time, I wanted a unified error response body from all our JSON API's, even the ones not transcoded from gRPC.
If only I could just, wrap a Status message with Details like an error.
And if only I could write my wrapped error right through a middleware layer to turn it into JSON.
Fast forward.
Until recently, I was struggling to understand when I should use an interface type in Go. I understood what, and mostly why, but the intuition wasn't all here.
While working on localizations for a project, it started to click a bit. Inspiration hit when I wanted to combine localizability with errors, and maybe also a request ID, and wouldn't ya know it suddenly I couldn't sleep with all the notes I had to write to myself in the "Probably Ideas" category, because errdetails is a thing that exists.
So to reinforce and practice the point till intuition, and also to get it out of the head so I can sleep again, I popped this old idea off the ol' // TODO: list and got to writing something I'll probably never maintain or use, but maybe I will and it'll be nice.
