exposing getarguments function

Author: branden-blackline

directives.go

@@ -2,6 +2,7 @@ package tools
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/graphql-go/graphql"
 	"github.com/graphql-go/graphql/language/ast"
@@ -197,7 +198,7 @@ func (c *registry) applyDirectives(p applyDirectiveParams) error {
 
 		args, err := GetArgumentValues(directive.Args, def.Arguments, map[string]interface{}{})
 		if err != nil {
-			return err
+			return fmt.Errorf("applyDirective %v error: %s", p.config, err)
 		}
 
 		switch p.config.(type) {

values.go

@@ -42,7 +42,12 @@ func GetArgumentValues(argDefs []*graphql.Argument, argASTs []*ast.Argument, var
 		typeString := argDef.Type.String()
 		isNonNull := typeString[len(typeString)-1:] == "!"
 		if isNonNull && isNullish(value) {
-			return nil, fmt.Errorf("graphql input %q cannot be null", name)
+			locs := []string{}
+
+			for _, a := range argASTs {
+				locs = append(locs, fmt.Sprintf("%d:%d", a.Loc.Start, a.Loc.End))
+			}
+			return nil, fmt.Errorf(`graphql input %q @ %q cannot be null`, name, locs)
 		}
 
 		if !isNullish(value) {