iframe-proxy | Sunbelt Computer Software

73 lines (58 loc) · 1.96 KB

package progress
// Progress represents the progress of a transfer.
type Progress struct {
	// Progress contains a Message or...
	Message string
	// ...progress of an action
	Action  string
	Current int64
	Total   int64
	// Aux contains extra information not presented to the user, such as
	// digests for push signing.
	Aux interface{}
	LastUpdate bool
// Output is an interface for writing progress information. It's
// like a writer for progress, but we don't call it Writer because
// that would be confusing next to ProgressReader (also, because it
// doesn't implement the io.Writer interface).
type Output interface {
	WriteProgress(Progress) error
type chanOutput chan<- Progress
func (out chanOutput) WriteProgress(p Progress) error {
	return nil
// ChanOutput returns a Output that writes progress updates to the
// supplied channel.
func ChanOutput(progressChan chan<- Progress) Output {
	return chanOutput(progressChan)
// Update is a convenience function to write a progress update to the channel.
func Update(out Output, id, action string) {
	out.WriteProgress(Progress{ID: id, Action: action})
// Updatef is a convenience function to write a printf-formatted progress update
// to the channel.
func Updatef(out Output, id, format string, a ...interface{}) {
	Update(out, id, fmt.Sprintf(format, a...))
// Message is a convenience function to write a progress message to the channel.
func Message(out Output, id, message string) {
	out.WriteProgress(Progress{ID: id, Message: message})
// Messagef is a convenience function to write a printf-formatted progress
// message to the channel.
func Messagef(out Output, id, format string, a ...interface{}) {
	Message(out, id, fmt.Sprintf(format, a...))
// Aux sends auxiliary information over a progress interface, which will not be
// formatted for the UI. This is used for things such as push signing.
func Aux(out Output, a interface{}) {
	out.WriteProgress(Progress{Aux: a})

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