From 8f3448c104f074b01132d2aabd5c76e238ad0fe1 Mon Sep 17 00:00:00 2001
From: Tomas Abrahamsson <tomas.abrahamsson@gmail.com>
Date: Thu, 12 May 2022 08:29:24 +0200
Subject: [PATCH] Align the gpc_error types more with the code

Add a type to specify what error values that the server side
can handle from rpc method callback functions, since this
is slightly different from the errors that can be returned
on the client side.
---
 src/grpcbox_stream.erl | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/grpcbox_stream.erl b/src/grpcbox_stream.erl
index d523f4d..ce6fb99 100644
--- a/src/grpcbox_stream.erl
+++ b/src/grpcbox_stream.erl
@@ -31,6 +31,7 @@
               grpc_status_message/0,
               grpc_error/0,
               grpc_error_response/0,
+              grpc_callback_error/0,
               grpc_error_data/0,
               grpc_extended_error_response/0]).
 
@@ -61,15 +62,19 @@
 
 -type t() :: #state{}.
 
--type grpc_status_message() :: unicode:chardata().
+-type grpc_status_message() :: unicode:unicode_binary().
 -type grpc_status() :: 0..16.
 -type http_status() :: integer().
--type grpc_error() :: {grpc_status(), grpc_status_message()}.
+-type grpc_error() :: {unicode:unicode_binary(), % containing a grpc_status() value as text
+                       grpc_status_message()}.
 -type grpc_error_response() :: {error, grpc_error(), #{headers => map(),
                                                        trailers => #{}}} |
                                {http_error, {http_status(), unicode:chardata()}, #{headers => map(),
                                                                                    trailers => #{}}} |
                                {error, term()}.
+-type grpc_callback_error() :: {error, grpc_error(), #{headers => map(),
+                                                       trailers => #{}}}.
+
 -type grpc_error_data() :: #{
     status := grpc_status(),
     message := grpc_status_message(),