gql_utils: fix fmt and return err msg

src/graphql_utils.rs

@@ -5,7 +5,8 @@ use graphql_parser::query::Field;
 use graphql_parser::query::OperationDefinition;
 use graphql_parser::query::Selection;
 use graphql_parser::query::SelectionSet;
-use graphql_parser::query::{Text, Value};
+use graphql_parser::query::Text;
+use graphql_parser::query::Value;
 use std::convert::TryFrom;
 use warp::http::status::StatusCode;
 
@@ -55,11 +56,11 @@ pub fn parse_graphql_query(query_string: &str) -> Result<QueryASTNode> {
     // TODO error handling
     let parsed = match parse_query::<String>(query_string) {
         Ok(res) => res,
-        Err(_) => {
+        Err(err) => {
             return Err(Error {
                 code: StatusCode::BAD_REQUEST,
-                msg: "Invalid GraphQL query".to_owned(),
-            })
+                msg: format!("Invalid GraphQL query {}", err).to_owned(),
+            });
         }
     };