Exemplo n.º 1
0
func findTask(whoAmI string, stopper *utils.Stopper) (string, database.Notification) {
	for {
		// Find a notification to send.
		node, notification, err := database.FindOneNotificationToSend(database.GetDefaultNotificationWrapper())
		if err != nil {
			log.Warningf("could not get notification to send: %s", err)
		}

		// No notification or error: wait.
		if notification == nil || err != nil {
			if !stopper.Sleep(checkInterval) {
				return "", nil
			}
			continue
		}

		// Lock the notification.
		if hasLock, _ := database.Lock(node, lockDuration, whoAmI); hasLock {
			log.Infof("found and locked a notification: %s", notification.GetName())
			return node, notification
		}
	}
}
Exemplo n.º 2
0
// Run updates the vulnerability database at regular intervals
func Run(interval time.Duration, st *utils.Stopper) {
	defer st.End()

	// Do not run the updater if the interval is 0
	if interval == 0 {
		log.Infof("updater service is disabled.")
		return
	}

	whoAmI := uuid.New()
	healthIdentifier = whoAmI
	log.Infof("updater service started. lock identifier: %s", whoAmI)

	for {
		// Set the next update time to (last update time + interval) or now if there
		// is no last update time stored in database (first update) or if an error
		// occurs
		nextUpdate := time.Now().UTC()
		if lastUpdateTSS, err := database.GetFlagValue(flagName); err == nil && lastUpdateTSS != "" {
			if lastUpdateTS, err := strconv.ParseInt(lastUpdateTSS, 10, 64); err == nil {
				healthLatestSuccessfulUpdate = time.Unix(lastUpdateTS, 0)
				nextUpdate = time.Unix(lastUpdateTS, 0).Add(interval)
			}
		}

		// If the next update timer is in the past, then try to update.
		if nextUpdate.Before(time.Now().UTC()) {
			// Attempt to get a lock on the the update.
			log.Debug("attempting to obtain update lock")
			hasLock, hasLockUntil := database.Lock(flagName, lockDuration, whoAmI)
			if hasLock {
				healthLockOwner = healthIdentifier

				// Launch update in a new go routine.
				doneC := make(chan bool, 1)
				go func() {
					Update()
					doneC <- true
				}()

				for done := false; !done; {
					select {
					case <-doneC:
						done = true
					case <-time.After(refreshLockDuration):
						// Refresh the lock until the update is done.
						database.Lock(flagName, lockDuration, whoAmI)
					}
				}

				// Unlock the update.
				database.Unlock(flagName, whoAmI)
			} else {
				lockOwner, lockExpiration, err := database.LockInfo(flagName)
				if err != nil {
					log.Debug("update lock is already taken")
					nextUpdate = hasLockUntil
				} else {
					log.Debugf("update lock is already taken by %s until %v", lockOwner, lockExpiration)
					nextUpdate = lockExpiration
					healthLockOwner = lockOwner
				}
			}
		}

		// Sleep, but remain stoppable until approximately the next update time.
		now := time.Now().UTC()
		waitUntil := nextUpdate.Add(time.Duration(rand.ExpFloat64()/0.5) * time.Second)
		log.Debugf("next update attempt scheduled for %v.", waitUntil)
		if !waitUntil.Before(now) {
			if !st.Sleep(waitUntil.Sub(time.Now())) {
				break
			}
		}
	}

	log.Info("updater service stopped")
}
Exemplo n.º 3
0
// Run updates the vulnerability database at regular intervals.
func Run(config *config.UpdaterConfig, st *utils.Stopper) {
	defer st.End()

	// Do not run the updater if there is no config or if the interval is 0.
	if config == nil || config.Interval == 0 {
		log.Infof("updater service is disabled.")
		return
	}

	// Register healthchecker.
	health.RegisterHealthchecker("updater", Healthcheck)

	whoAmI := uuid.New()
	log.Infof("updater service started. lock identifier: %s", whoAmI)

	for {
		// Set the next update time to (last update time + interval) or now if there
		// is no last update time stored in database (first update) or if an error
		// occurs.
		var nextUpdate time.Time
		var stop bool
		if lastUpdate := getLastUpdate(); !lastUpdate.IsZero() {
			nextUpdate = lastUpdate.Add(config.Interval)
		} else {
			nextUpdate = time.Now().UTC()
		}

		// If the next update timer is in the past, then try to update.
		if nextUpdate.Before(time.Now().UTC()) {
			// Attempt to get a lock on the the update.
			log.Debug("attempting to obtain update lock")
			hasLock, hasLockUntil := database.Lock(flagName, lockDuration, whoAmI)
			if hasLock {
				// Launch update in a new go routine.
				doneC := make(chan bool, 1)
				go func() {
					Update()
					doneC <- true
				}()

				for done := false; !done && !stop; {
					select {
					case <-doneC:
						done = true
					case <-time.After(refreshLockDuration):
						// Refresh the lock until the update is done.
						database.Lock(flagName, lockDuration, whoAmI)
					case <-st.Chan():
						stop = true
					}
				}

				// Unlock the update.
				database.Unlock(flagName, whoAmI)

				if stop {
					break
				}
				continue
			} else {
				lockOwner, lockExpiration, err := database.LockInfo(flagName)
				if err != nil {
					log.Debug("update lock is already taken")
					nextUpdate = hasLockUntil
				} else {
					log.Debugf("update lock is already taken by %s until %v", lockOwner, lockExpiration)
					nextUpdate = lockExpiration
				}
			}
		}

		// Sleep, but remain stoppable until approximately the next update time.
		now := time.Now().UTC()
		waitUntil := nextUpdate.Add(time.Duration(rand.ExpFloat64()/0.5) * time.Second)
		log.Debugf("next update attempt scheduled for %v.", waitUntil)
		if !waitUntil.Before(now) {
			if !st.Sleep(waitUntil.Sub(time.Now())) {
				break
			}
		}
	}

	log.Info("updater service stopped")
}
Exemplo n.º 4
0
// Run pops notifications from the database, lock them, send them, mark them as
// send and unlock them
//
// It uses an exponential backoff when POST requests fail
func (notifier *HTTPNotifier) Run(st *utils.Stopper) {
	defer st.End()

	whoAmI := uuid.New()
	log.Infof("HTTP notifier started. URL: %s. Lock Identifier: %s", notifier.url, whoAmI)

	for {
		node, notification, err := database.FindOneNotificationToSend(database.GetDefaultNotificationWrapper())
		if notification == nil || err != nil {
			if err != nil {
				log.Warningf("could not get notification to send: %s.", err)
			}

			if !st.Sleep(checkInterval) {
				break
			}

			continue
		}

		// Try to lock the notification
		hasLock, hasLockUntil := database.Lock(node, lockDuration, whoAmI)
		if !hasLock {
			continue
		}

		for backOff := time.Duration(0); ; backOff = timeutil.ExpBackoff(backOff, maxBackOff) {
			// Backoff, it happens when an error occurs during the communication
			// with the notification endpoint
			if backOff > 0 {
				// Renew lock before going to sleep if necessary
				if time.Now().Add(backOff).After(hasLockUntil.Add(-refreshLockAnticipation)) {
					hasLock, hasLockUntil = database.Lock(node, lockDuration, whoAmI)
					if !hasLock {
						log.Warning("lost lock ownership, aborting")
						break
					}
				}

				// Sleep
				if !st.Sleep(backOff) {
					return
				}
			}

			// Get notification content
			content, err := notification.GetContent()
			if err != nil {
				log.Warningf("could not get content of notification '%s': %s", notification.GetName(), err.Error())
				break
			}

			// Marshal the notification content
			jsonContent, err := json.Marshal(struct {
				Name, Type string
				Content    interface{}
			}{
				Name:    notification.GetName(),
				Type:    notification.GetType(),
				Content: content,
			})
			if err != nil {
				log.Errorf("could not marshal content of notification '%s': %s", notification.GetName(), err.Error())
				break
			}

			// Post notification
			req, _ := http.NewRequest("POST", notifier.url, bytes.NewBuffer(jsonContent))
			req.Header.Set("Content-Type", "application/json")

			client := &http.Client{}
			res, err := client.Do(req)
			if err != nil {
				log.Warningf("could not post notification '%s': %s", notification.GetName(), err.Error())
				continue
			}
			res.Body.Close()

			if res.StatusCode != 200 && res.StatusCode != 201 {
				log.Warningf("could not post notification '%s': got status code %d", notification.GetName(), res.StatusCode)
				continue
			}

			// Mark the notification as sent
			database.MarkNotificationAsSent(node)

			log.Infof("sent notification '%s' successfully", notification.GetName())
			break
		}

		if hasLock {
			database.Unlock(node, whoAmI)
		}
	}

	log.Info("HTTP notifier stopped")
}
Exemplo n.º 5
0
// Run starts the Notifier service.
func Run(config *config.NotifierConfig, stopper *utils.Stopper) {
	defer stopper.End()

	// Configure registered notifiers.
	for notifierName, notifier := range notifiers {
		if configured, err := notifier.Configure(config); configured {
			log.Infof("notifier '%s' configured\n", notifierName)
		} else {
			delete(notifiers, notifierName)
			if err != nil {
				log.Errorf("could not configure notifier '%s': %s", notifierName, err)
			}
		}
	}

	// Do not run the updater if there is no notifier enabled.
	if len(notifiers) == 0 {
		log.Infof("notifier service is disabled")
		return
	}

	whoAmI := uuid.New()
	log.Infof("notifier service started. lock identifier: %s\n", whoAmI)

	// Register healthchecker.
	health.RegisterHealthchecker("notifier", Healthcheck)

	for running := true; running; {
		// Find task.
		// TODO(Quentin-M): Combine node and notification.
		node, notification := findTask(whoAmI, stopper)
		if node == "" && notification == nil {
			// Interrupted while finding a task, Clair is stopping.
			break
		}

		// Handle task.
		done := make(chan bool, 1)
		go func() {
			success, interrupted := handleTask(notification, stopper, config.Attempts)
			if success {
				database.MarkNotificationAsSent(node)
			}
			if interrupted {
				running = false
			}
			database.Unlock(node, whoAmI)
			done <- true
		}()

		// Refresh task lock until done.
	outer:
		for {
			select {
			case <-done:
				break outer
			case <-time.After(refreshLockDuration):
				database.Lock(node, lockDuration, whoAmI)
			}
		}
	}

	log.Info("notifier service stopped")
}