orion/reach/time_sync.go

package reach

import (
	"sync"

	"forge.cadoles.com/Pyxis/golang-socketio"
	"github.com/pkg/errors"
)

const (
	eventGetTimeSyncStatus = "get time sync status"
	eventTimeSyncResults   = "time sync status"
)

type timeSyncStatus struct {
	Status bool `json:"status"`
}

// TimeSynced returns the ReachRS module time synchronization status.
// A true response means that the module has synchronized its clock.
func (u *Updater) TimeSynced() (bool, error) {

	var err error
	var synced bool
	var wg sync.WaitGroup

	wg.Add(1)

	err = u.conn.On(eventTimeSyncResults, func(h *gosocketio.Channel, st *timeSyncStatus) {
		synced = st.Status
		u.conn.Off(eventTimeSyncResults)
		wg.Done()
	})
	if err != nil {
		return false, errors.Wrapf(err, "error while binding to '%s' event", eventTimeSyncResults)
	}

	u.logf("sending '%s' event", eventGetTimeSyncStatus)
	if err = u.conn.Emit(eventGetTimeSyncStatus, nil); err != nil {
		return false, errors.Wrapf(err, "error while emitting '%s' event", eventGetTimeSyncStatus)
	}
	u.logf("'%s' event sent", eventGetTimeSyncStatus)

	wg.Wait()

	u.logf("time sync result: %v", synced)

	return synced, err

}