Cannot define global function - undeclared reference error

[davenewza]

For the expression upper("abc") == "ABC" I am getting this error

ERROR: :1:1: undeclared reference to 'upper' (in container '')
| upper
| ^

But I have correctly specified the function declaration, I believe? Judging from the error, it's looking for a member function and not a global function.

env, err := cel.NewEnv(
  cel.ClearMacros(),
  cel.CustomTypeProvider(typeProvider),
  cel.Function("upper",
	  cel.Overload("string_uppercase_string",
		  []*cel.Type{cel.StringType},
		  cel.StringType,
		  cel.UnaryBinding(func(lhs ref.Val) ref.Val {
			  return types.String(strings.ToUpper(fmt.Sprintf("%s", lhs)))
		  }),
	  ),
  ),
)

Can someone please point me in the right direction as I am completely stuck

I am using 0.21.0

[davenewza]

This example looks pretty much the same https://github.com/google/cel-go/blob/master/examples/custom_global_function_test.go

[TristonianJones]

Hi @davenewza,

I'm able to run the upper function successfully as-is though I would recommend the following naming convention for the overload: upper_string since it's unary and global. This is a minor comment though and won't affect functionality.

Perhaps if you could include more of the test setup?

-Tristan

[davenewza]

I figured it out, and unrelated to CEL - apologies