server/graph/scalars/duration.go

package scalars

import (
	"fmt"
	"github.com/99designs/gqlgen/graphql"
	"io"
	"strconv"
	"time"
)

func MarshalDuration(d time.Duration) graphql.Marshaler {
	return graphql.WriterFunc(func(w io.Writer) {
		_, _ = w.Write([]byte(strconv.Itoa(int(d.Milliseconds()))))
	})
}

func UnmarshalDuration(v interface{}) (time.Duration, error) {
	switch v := v.(type) {
	case string:
		return time.ParseDuration(v)
	case int:
		return time.Millisecond * time.Duration(v), nil
	case int64:
		return time.Millisecond * time.Duration(v), nil
	case float64:
		return time.Millisecond * time.Duration(v), nil
	default:
		return 0, fmt.Errorf("%T is not a bool", v)
	}
}