Ejemplo n.º 1
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")
}
Ejemplo n.º 2
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")
}