Fixed "act" declaration outside the handling loop so it is nil on every cycle of the loop.

cmd/test/main.go

@@ -23,7 +23,7 @@ var (
 			c.Sendf("%d", d.Counter)
 		}),
 		tx.NewButton("-").ActionFunc(func(c *tx.Context) {
-			d := c.V.(*UserData)
+			d := c.SessionValue().(*UserData)
 			d.Counter--
 			c.Sendf("%d", d.Counter)
 		}),
@@ -48,9 +48,8 @@ var (
 				WithSendLocation(true).
 				ActionFunc(func(c *tx.Context) {
 					var err error
-					u := c.Update
-					if u.Message.Location != nil {
-						l := u.Message.Location
+					if c.Message.Location != nil {
+						l := c.Message.Location
 						err = c.Sendf(
 							"Longitude: %f\n"+
 								"Latitude: %f\n"+
@@ -181,7 +180,7 @@ var gBeh = tx.NewGroupBehaviour().
 			c.Send("Hello, World!")
 		}),
 		tx.NewGroupCommand("mycounter").ActionFunc(func(c *tx.GC) {
-			d := c.GetSessionValue().(*UserData)
+			d := c.SessionValue().(*UserData)
 			c.Sendf("Your counter value is %d", d.Counter)
 		}),
 	)

src/tx/bot.go

@@ -36,7 +36,7 @@ func NewBot(token string) (*Bot, error) {
 	}, nil
 }
 
-func (bot *Bot) GetSessionValueBySid(
+func (bot *Bot) SessionValueBySid(
 	sid SessionId,
 ) (any, bool) {
 	v, ok := bot.sessions[sid]

src/tx/context.go

@@ -21,13 +21,13 @@ type context struct {
 
 // Goroutie function to handle each user.
 func (c *context) handleUpdateChan(updates chan *Update) {
-	var act Action
 	beh := c.behaviour
 
 	if beh.Init != nil {
 		c.run(beh.Init, nil)
 	}
 	for u := range updates {
+		var act Action
 		screen := c.curScreen
 		// The part is added to implement custom update handling.
 		if u.Message != nil {
@@ -70,7 +70,10 @@ func (c *context) handleUpdateChan(updates chan *Update) {
 				}
 			}
 		} else if u.CallbackQuery != nil {
-			cb := apix.NewCallback(u.CallbackQuery.ID, u.CallbackQuery.Data)
+			cb := apix.NewCallback(
+				u.CallbackQuery.ID,
+				u.CallbackQuery.Data,
+			)
 			data := u.CallbackQuery.Data
 
 			_, err := c.Request(cb)

src/tx/group.go

@@ -18,8 +18,8 @@ func (c *GroupContext) SentFromSid() SessionId {
 	return SessionId(c.SentFrom().ID)
 }
 
-func (a *GroupContext) GetSessionValue() any {
-	v, _ := a.Bot.GetSessionValueBySid(a.SentFromSid())
+func (a *GroupContext) SessionValue() any {
+	v, _ := a.Bot.SessionValueBySid(a.SentFromSid())
 	return v
 }
 

src/tx/private.go

@@ -57,3 +57,8 @@ func (c *Context) ChangeScreen(screenId ScreenId) error {
 
 	return nil
 }
+
+func (c *Context) SessionValue() any {
+	v, _ := c.SessionValueBySid(c.Id)
+	return v
+}