Add NATS notifier (#2795)

cmd/event-notifier.go

@@ -332,6 +332,34 @@ func loadAllQueueTargets() (map[string]*logrus.Logger, error) {
 		}
 		queueTargets[queueARN] = amqpLog
 	}
+	// Load all nats targets, initialize their respective loggers.
+	for accountID, natsN := range serverConfig.GetNATS() {
+		if !natsN.Enable {
+			continue
+		}
+		// Construct the queue ARN for NATS.
+		queueARN := minioSqs + serverConfig.GetRegion() + ":" + accountID + ":" + queueTypeNATS
+		// Queue target if already initialized we move to the next ARN.
+		_, ok := queueTargets[queueARN]
+		if ok {
+			continue
+		}
+		// Using accountID we can now initialize a new NATS logrus instance.
+		natsLog, err := newNATSNotify(accountID)
+		if err != nil {
+			// Encapsulate network error to be more informative.
+			if _, ok := err.(net.Error); ok {
+				return nil, &net.OpError{
+					Op:  "Connecting to " + queueARN,
+					Net: "tcp",
+					Err: err,
+				}
+			}
+			return nil, err
+		}
+		queueTargets[queueARN] = natsLog
+	}
+
 	// Load redis targets, initialize their respective loggers.
 	for accountID, redisN := range serverConfig.GetRedis() {
 		if !redisN.Enable {