Add error output for failed ruby credentials plugin
diff --git a/src/ruby/ext/grpc/rb_call_credentials.c b/src/ruby/ext/grpc/rb_call_credentials.c
index 2426f10..a32117b 100644
--- a/src/ruby/ext/grpc/rb_call_credentials.c
+++ b/src/ruby/ext/grpc/rb_call_credentials.c
@@ -41,6 +41,7 @@
#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
#include "rb_call.h"
#include "rb_event_thread.h"
@@ -81,14 +82,23 @@
static VALUE grpc_rb_call_credentials_callback_rescue(VALUE args,
VALUE exception_object) {
VALUE result = rb_hash_new();
+ VALUE backtrace = rb_funcall(
+ rb_ivar_get(exception_object, rb_intern("backtrace")),
+ rb_intern("join"),
+ 1, rb_str_new2("\n\tfrom "));
+ VALUE exception_info = rb_funcall(exception_object, rb_intern("to_s"), 0);
+ const char *exception_classname = rb_obj_classname(exception_object);
(void)args;
+ gpr_log(GPR_INFO, "Call credentials callback failed: %s %s\n%s",
+ exception_classname, StringValueCStr(exception_info),
+ StringValueCStr(backtrace));
rb_hash_aset(result, rb_str_new2("metadata"), Qnil);
/* Currently only gives the exception class name. It should be possible get
more details */
rb_hash_aset(result, rb_str_new2("status"),
INT2NUM(GRPC_STATUS_PERMISSION_DENIED));
rb_hash_aset(result, rb_str_new2("details"),
- rb_str_new2(rb_obj_classname(exception_object)));
+ rb_str_new2(exception_classname));
return result;
}