General cleanup, testing improvements

main.go

@@ -23,14 +23,14 @@ type TgSender struct {
 }
 
 func (self TgSender) Send(msg GenericMessage) error {
-	to_send := tgbotapi.NewMessage(msg.chat_id, msg.msg)
-	_, err := self.bot.Send(to_send)
+	toSend := tgbotapi.NewMessage(msg.chatId, msg.msg)
+	_, err := self.bot.Send(toSend)
 	return err
 }
 
-func send_tg_message(tg_events chan GenericMessage, msg string, chat_ids []int64) {
-	for _, chat_id := range chat_ids {
-		tg_events <- GenericMessage{chat_id, msg}
+func sendTgMessage(tgEvents chan GenericMessage, msg string, chatIds []int64) {
+	for _, chatId := range chatIds {
+		tgEvents <- GenericMessage{chatId, msg}
 	}
 }
 
@@ -43,49 +43,61 @@ func (self RealSleeper) Sleep(ch chan<- interface{}) {
 	ch <- nil
 }
 
-func main() {
-	var (
-		wg        sync.WaitGroup
-		tg_events = make(chan GenericMessage)
-		sleeper   = RealSleeper{time.Second * 15}
-	)
-	satel_api_addr := flag.String("satel-addr", "", "Address that should be used to connect to the SATEL device")
-	satel_api_port := flag.String("satel-port", "7094", "Port that should be used to connect to the SATEL device")
-	chat_id_raw := flag.String("tg-chat-id", "", "Telegram Chat ID where to send updates. Use \",\" to specify multiple IDs.")
+func getCmdLineParams() (string, []int64) {
+	satelApiAddr := flag.String("satel-addr", "", "Address that should be used to connect to the SATEL device")
+	satelApiPort := flag.String("satel-port", "7094", "Port that should be used to connect to the SATEL device")
+	chatIdRaw := flag.String("tg-chat-id", "", "Telegram Chat ID where to send updates. Use \",\" to specify multiple IDs.")
 	flag.Parse()
 
-	if len(*satel_api_addr) == 0 || len(*satel_api_port) == 0 || len(*chat_id_raw) == 0 {
+	if len(*satelApiAddr) == 0 || len(*satelApiPort) == 0 || len(*chatIdRaw) == 0 {
 		fmt.Println("Use --satel-addr=ADDR, --satel-port=PORT and --tg-chat-id=CHAT_ID command line flags to continue.")
 		os.Exit(1)
 	}
-	chat_ids_strings := strings.Split(*chat_id_raw, ",")
-	var chat_ids []int64
-	for _, chat_id_str := range chat_ids_strings {
-		chat_id, err := strconv.ParseInt(chat_id_str, 10, 64)
+	chatIdsStrings := strings.Split(*chatIdRaw, ",")
+	var chatIds []int64
+	for _, chatIdStr := range chatIdsStrings {
+		chatId, err := strconv.ParseInt(chatIdStr, 10, 64)
 		if err != nil {
-			fmt.Printf("Tried to use a non-int value for one of tg_chat_ids: %s. That's bad.", chat_id_str)
+			fmt.Printf("Tried to use a non-int value for one of tg_chatIds: %s. That's bad.", chatIdStr)
 			os.Exit(1)
 		}
-		chat_ids = append(chat_ids, chat_id)
+		chatIds = append(chatIds, chatId)
 	}
 
-	satel_addr := fmt.Sprintf("%s:%s", *satel_api_addr, *satel_api_port)
-	satel_conn, err := net.Dial("tcp", satel_addr)
+	satelAddr := fmt.Sprintf("%s:%s", *satelApiAddr, *satelApiPort)
+	return satelAddr, chatIds
+}
+
+func makeSatel(satelAddr string) *satel.Satel {
+	satelConn, err := net.Dial("tcp", satelAddr)
 	if err != nil {
 		panic(err)
 	}
-	s := satel.NewConfig(satel_conn, satel.Config{EventsQueueSize: 1000})
+	return satel.NewConfig(satelConn, satel.Config{EventsQueueSize: 10})
+}
+
+func main() {
+	var (
+		wg       sync.WaitGroup
+		tgEvents = make(chan GenericMessage, 100)
+		sleeper  = RealSleeper{time.Second * MessageNotMoreOftenThanSeconds}
+	)
+
+	satelAddr, chatIds := getCmdLineParams()
+
+	s := makeSatel(satelAddr)
+
 	bot, err := tgbotapi.NewBotAPI(os.Getenv("TELEGRAM_APITOKEN"))
 	if err != nil {
 		panic(err)
 	}
 
 	tgSender := TgSender{bot}
-	go tg_sender_worker(tg_events, tgSender, &wg, sleeper)
-	for e, ok := <-s.Events; ok; e, ok = <-s.Events {
-		send_tg_message(tg_events, fmt.Sprintln("Change from SATEL: ", "type", e.Type, "index", e.Index, "value", e.Value), chat_ids)
+	go tgSenderWorker(tgEvents, tgSender, &wg, sleeper)
+	for e := range s.Events {
+		sendTgMessage(tgEvents, fmt.Sprintln("Change from SATEL: ", "type", e.Type, "index", e.Index, "value", e.Value), chatIds)
 	}
 
-	close(tg_events)
+	close(tgEvents)
 	wg.Wait()
 }

sender_worker.go

@@ -6,8 +6,8 @@ import (
 )
 
 type GenericMessage struct {
-	chat_id int64
-	msg     string
+	chatId int64
+	msg    string
 }
 
 type Sender interface {
@@ -18,7 +18,7 @@ type Sleeper interface {
 	Sleep(ch chan<- interface{})
 }
 
-func tg_sender_worker(tg_events <-chan GenericMessage, s Sender, wg *sync.WaitGroup, sleeper Sleeper) {
+func tgSenderWorker(tgEvents <-chan GenericMessage, s Sender, wg *sync.WaitGroup, sleeper Sleeper) {
 	wg.Add(1)
 	defer wg.Done()
 	messagesToSend := make(map[int64]*strings.Builder)
@@ -28,37 +28,37 @@ func tg_sender_worker(tg_events <-chan GenericMessage, s Sender, wg *sync.WaitGr
 loop:
 	for {
 		select {
-		case ev, ok := <-tg_events:
+		case ev, ok := <-tgEvents:
 			if !ok {
 				break loop
 			}
 			// Collect all messages to send them at once
-			_, messageBuilderExists := messagesToSend[ev.chat_id]
+			_, messageBuilderExists := messagesToSend[ev.chatId]
 			if !messageBuilderExists {
-				messagesToSend[ev.chat_id] = &strings.Builder{}
+				messagesToSend[ev.chatId] = &strings.Builder{}
 			}
-			messagesToSend[ev.chat_id].WriteString(ev.msg)
-			messagesToSend[ev.chat_id].WriteRune('\n')
+			messagesToSend[ev.chatId].WriteString(ev.msg)
+			messagesToSend[ev.chatId].WriteRune('\n')
 			if !waitingStarted {
 				waitingStarted = true
 				sleeper.Sleep(timeoutEvents)
 			}
 		case <-timeoutEvents:
 			waitingStarted = false
-			for chat_id, msgBuilder := range messagesToSend {
-				err := s.Send(GenericMessage{chat_id, msgBuilder.String()})
+			for chatId, msgBuilder := range messagesToSend {
+				err := s.Send(GenericMessage{chatId, msgBuilder.String()})
 				if err != nil {
 					// TODO: handle it better
 					panic(err)
 				}
-				delete(messagesToSend, chat_id)
+				delete(messagesToSend, chatId)
 			}
 		}
 	}
 
 	// If anything is left to be sent, send it now
-	for chat_id, msgBuilder := range messagesToSend {
-		err := s.Send(GenericMessage{chat_id, msgBuilder.String()})
+	for chatId, msgBuilder := range messagesToSend {
+		err := s.Send(GenericMessage{chatId, msgBuilder.String()})
 		if err != nil {
 			// TODO: handle it better
 			panic(err)

sender_worker_test.go

@@ -16,29 +16,34 @@ func (self *MockSender) Send(msg GenericMessage) error {
 }
 
 type MockSleeper struct {
-	ch *chan<- interface{}
+	ch        *chan<- interface{}
+	callCount int
 }
 
 func (self *MockSleeper) Sleep(ch chan<- interface{}) {
 	if self.ch == nil {
 		self.ch = &ch
 	}
+	self.callCount += 1
 }
 
 func TestMessageThrottling(t *testing.T) {
 	testEvents := make(chan GenericMessage)
 	wg := sync.WaitGroup{}
 	mockSender := MockSender{make([]GenericMessage, 0)}
-	mockSleeper := MockSleeper{}
-	go tg_sender_worker(testEvents, &mockSender, &wg, &mockSleeper)
+	mockSleeper := MockSleeper{nil, 0}
+	go tgSenderWorker(testEvents, &mockSender, &wg, &mockSleeper)
 	testEvents <- GenericMessage{123, "test1"}
 	testEvents <- GenericMessage{124, "test3"}
 	testEvents <- GenericMessage{123, "test2"}
 	testEvents <- GenericMessage{124, "test4"}
+	assert.Equal(t, 1, mockSleeper.callCount)
 	*mockSleeper.ch <- nil
+	assert.Equal(t, 1, mockSleeper.callCount)
 	testEvents <- GenericMessage{123, "test5"}
 	close(testEvents)
 	wg.Wait()
+	assert.Equal(t, 2, mockSleeper.callCount)
 
 	assert.Len(t, mockSender.messages, 3)
 	assert.Contains(t, mockSender.messages, GenericMessage{123, "test1\ntest2\n"})