Exemple #1
0
// ****** Client time to server ****** //
func sendOffsetToServer(serverTime time.Time) {
	// Calculate offset
	offset := myTime.Sub(serverTime)
	m := message.NewClockOffset(offset)
	log.Println("[Client] Client has offset of", offset)
	sendXmlToServer(m)
}
Exemple #2
0
// ****** Server time  ****** //
func sendTimeRequest(period time.Duration) {
	c := time.Tick(period)
	mutex := sync.Mutex{}
	for _ = range c {
		mutex.Lock()
		areWeGettingClocks = true
		time.AfterFunc(period/2, func() {
			// Stop getting clocks after n time and send updates
			log.Println("[Server] Stop recieving time")
			// Sanity check, if no one is here return
			if len(connections) == 0 {
				return
			}
			areWeGettingClocks = false
			var sumOfClocks int64
			var computedCloks int64
			for _, c := range userClocks {
				// FIXME
				// Calculate average
				// TODO Probably should check for overflow
				log.Println("[Server] user clocks", userClocks)
				log.Println("[Server] ", c)
				if c.Timestamp == nil {
					continue
				}
				sumOfClocks += c.Timestamp.Unix()
				computedCloks++
			}
			if computedCloks == 0 {
				return
			}
			average := sumOfClocks / computedCloks
			log.Println("[Server] Clock average", average)
			// Create new time object and send to users
			// "0" since we don't have nanoseconds
			averageTime := time.Unix(average, 0)

			// Then send that average to all users that need to adjust their clocks
			// Now send it to all users
			for i, u := range userClocks {
				// This gives me an offset.
				// FIXME
				if u.Timestamp == nil {
					continue
				}
				adjustment := averageTime.Sub(*u.Timestamp)
				m := message.NewClockOffset(adjustment)
				log.Println("[Server] Adjustment for user", i, adjustment)
				log.Println("[Server] Becasue user has", *u.Timestamp)
				mm, _ := xml.Marshal(m)
				// Get user reference
				usr, ok := connections[u.User.String()]
				if !ok {
					log.Println("[Server] error sending message to user with address", userClocks[i].User.String())
				}
				sendMessageToUser(usr, mm)
			}

			// Finally, clear slice
			userClocks = userClocks[:0]
		})
		// For server time is always time.Now, since he
		// doesn't adjust his clock
		m := message.NewClockSyncPetition(time.Now())
		mm, _ := xml.Marshal(m)
		log.Println("[Server] Sending time to user", m)
		for _, u := range connections {
			sendMessageToUser(u, mm)
		}
		mutex.Unlock()
	}
}