Attach error details to status in Ruby

[Connor Taffe]

At work we're standardizing on using the Richer Error Model and had success using it in Go with the errdetails package and WithDetails method. However, we also write a lot of Ruby. In Ruby, it's not documented how you would attach details to the status. Is it possible to attach error details using the error classes e.g. GRPC::InvalidArgument? If not, is it possible to write my own error classes which would allow attaching details?

For example perhaps I can create an API like this?

raise GRPC::InvalidArgument.new(
  "foo.bar must only contain alphanumeric characters",
  details: Google::Rpc::BadRequest.new(
    field_violations: [
      Google::Rpc::BadRequest::FieldViolation.new(
        field: "foo.bar",
        description: "must only contain alphanumeric characters"
      )
    ]
  )
)

[apo...@google.com]

There isn't currently a convenience API for doing this at the Ruby server but it is possible, by doing something like what is done in this test server: https://github.com/grpc/grpc/blob/fa02ab8d3fc961f8a155412655c21a9659efa29d/src/ruby/spec/google_rpc_status_utils_spec.rb#L128

I.e., you can create a Google::Rpc::Status protobuf, and then pack the serialized version of it into status details, as in https://github.com/grpc/grpc/blob/fa02ab8d3fc961f8a155412655c21a9659efa29d/src/ruby/spec/google_rpc_status_utils_spec.rb#L135.

Does that help?