Also support Duration type via humantime crate

juniper/src/integrations/humantime.rs

@@ -1,6 +1,7 @@
-use std::time::{SystemTime};
+use std::time::{SystemTime, Duration};
 
 use humantime::{parse_rfc3339_weak, format_rfc3339};
+use humantime::{parse_duration, format_duration};
 
 use Value;
 
@@ -19,6 +20,20 @@ graphql_scalar!(SystemTime as "DateTime" {
     }
 });
 
+graphql_scalar!(Duration as "Duration" {
+    description: "Duration in human-readable form, like '15min 2ms'"
+
+    resolve(&self) -> Value {
+        Value::string(format_duration(*self).to_string())
+    }
+
+    from_input_value(v: &InputValue) -> Option<Duration> {
+        v.as_string_value().and_then(|s| {
+            parse_duration(s).ok()
+        })
+    }
+});
+
 
 #[cfg(test)]
 mod test {
@@ -32,9 +47,20 @@ mod test {
         assert_eq!(parsed, expected);
     }
 
+    fn duration(raw: &'static str) -> Duration {
+        let input = ::InputValue::String(raw.to_string());
+        ::FromInputValue::from_input_value(&input).unwrap()
+    }
+
     #[test]
     fn datetime_utc_from_input_value() {
         datetime_utc_test("2014-11-28T21:00:09Z", 1417208409)
     }
 
+    #[test]
+    fn duration_test() {
+        assert_eq!(duration("2min"), Duration::new(120, 0));
+        assert_eq!(duration("2m 15sec 12ms"), Duration::new(135, 12_000_000));
+    }
+
 }