replaced struct{} with callback func for testing

ringbuffer.go

@@ -211,10 +211,15 @@ func (r *ringBuffer) processBufferMessages(samValueBucket string, outCh chan sam
 		// error with an individual message occurs.
 		go func(v samDBValue) {
 			v.Data.Message.done = make(chan struct{})
+			delivredCh := make(chan struct{})
 
+			// Prepare the structure with the data, and a function that can
+			// be called when the data is received for signaling back.
 			sd := samDBValueAndDelivered{
 				samDBValue: v,
-				delivered:  make(chan struct{}),
+				delivered: func() {
+					delivredCh <- struct{}{}
+				},
 			}
 
 			outCh <- sd
@@ -222,7 +227,7 @@ func (r *ringBuffer) processBufferMessages(samValueBucket string, outCh chan sam
 			// the read process have stalled or not.
 			// For now it will not do anything,
 			select {
-			case <-sd.delivered:
+			case <-delivredCh:
 				// OK.
 			case <-time.After(time.Second * 5):
 				// Testing with a timeout here to figure out if messages are stuck

server.go

@@ -288,7 +288,7 @@ func (s *server) Start() {
 
 	// Adding a safety function here so we can make sure that all processes
 	// are stopped after a given time if the context cancelation below hangs.
-	defer func() {
+	func() {
 		time.Sleep(time.Second * 0)
 		log.Printf("error: doing a non graceful shutdown of all processes..\n")
 		os.Exit(1)
@@ -354,9 +354,12 @@ func createErrorMsgContent(FromNode Node, theError error) subjectAndMessage {
 	return sam
 }
 
+// Contains the sam value as it is used in the state DB, and also a
+// delivered function to be called when this message is picked up, so
+// we can control if messages gets stale at some point.
 type samDBValueAndDelivered struct {
 	samDBValue samDBValue
-	delivered  chan struct{}
+	delivered  func()
 }
 
 // routeMessagesToProcess takes a database name and an input channel as
@@ -401,7 +404,7 @@ func (s *server) routeMessagesToProcess(dbFileName string, newSAM chan []subject
 
 	go func() {
 		for samTmp := range ringBufferOutCh {
-			samTmp.delivered <- struct{}{}
+			samTmp.delivered()
 
 			sam := samTmp.samDBValue.Data
 			// Check if the format of the message is correct.