added delayQueue command (admin)

internal/botaccess/admincommands.go

@@ -76,6 +76,36 @@ var AdminCommands = []types.AcceptedCommands{
 		Description: "Explains the main functionalities of the bot.",
 		Handler:     AdminHelpCommand,
 	},
+	{
+		Command:     "delay",
+		Description: "Notifies users of a delay",
+		Handler:     DelayCommand,
+	},
+}
+
+func DelayCommand(userMessage tgbotapi.Update, bot *tgbotapi.BotAPI) (feedback string) {
+	queueUsers, err := dbaccess.DelayQueue()
+
+	if err != nil {
+		feedback = delayQueueFeedback
+		log.Printf("Error sending message %v\n", err)
+		return feedback
+	}
+
+	for _, user :=  range queueUsers {
+		telegramHandle := user.UserHandle
+		msg := tgbotapi.NewMessage(user.ChatID, delayQueueFeedback)
+		_, err = bot.Send(msg)
+
+		if err != nil {
+			feedback = "You failed to send delay message to " + telegramHandle + " : " + err.Error()
+			log.Printf("Error sending message to @%s", telegramHandle)
+			return feedback
+		}
+	}
+
+	feedback = "Delay message sent to all users."
+	return feedback
 }
 
 func AddDummyCommand(userMessage tgbotapi.Update, bot *tgbotapi.BotAPI) (feedback string) {

internal/botaccess/settings.go

@@ -38,6 +38,8 @@ const (
 
 	/help - view all available functions for this bot.
 
+	/delay - send a delay message to all users.
+
 	Bot controls (users):
 
 	/join - join the photobooth queue.
@@ -105,4 +107,5 @@ const (
 	thirdInQueueFeedback  string = "2 groups left in front of you - please head down to the photobooth!"
 
 	kickedFromQueueFeedback string = "You have been kicked from the queue."
+	delayQueueFeedback      string = "We are experiencing some delay. Thank you for being patient!"
 )

internal/dbaccess/queue.go

@@ -103,3 +103,15 @@ func NotifyQueue(position int64) (chatID int64, err error) {
 
 	return user.ChatID, nil
 }
+
+func DelayQueue() ([]types.QueueUser, error) {
+	queue := []types.QueueUser{}
+	if err := db.Select(&queue, `
+	SELECT 
+		queue_id, user_handle, chat_id, (joined_at AT TIME ZONE 'UTC-8') AS joined_at
+	FROM queue;`); err != nil {
+		return nil, fmt.Errorf("failed to get users. %v", err)
+	}
+
+	return queue, nil
+}