Limit task lists and clamp message length

bot/main.py

@@ -41,14 +41,33 @@ def build_keyboard() -> InlineKeyboardMarkup:
 
 
 async def render_view(view: View, client: BoincClient) -> str:
+    MAX_ITEMS = 20
     snapshot = await client.fetch_snapshot()
     if view == "dashboard":
         return format_dashboard(snapshot)
     if view == "active":
-        return format_tasks_section("Активные задачи", snapshot.active)
+        extra = len(snapshot.active) - MAX_ITEMS
+        text = format_tasks_section("Активные задачи", snapshot.active[:MAX_ITEMS])
+        if extra > 0:
+            text += f"\n... и еще {extra} задач(и)"
+        return text
     if view == "queued":
-        return format_tasks_section("Ожидают запуска", snapshot.queued)
-    return format_tasks_section("Готовы к отправке", snapshot.completed)
+        extra = len(snapshot.queued) - MAX_ITEMS
+        text = format_tasks_section("Ожидают запуска", snapshot.queued[:MAX_ITEMS])
+        if extra > 0:
+            text += f"\n... и еще {extra} задач(и)"
+        return text
+    extra = len(snapshot.completed) - MAX_ITEMS
+    text = format_tasks_section("Готовы к отправке", snapshot.completed[:MAX_ITEMS])
+    if extra > 0:
+        text += f"\n... и еще {extra} задач(и)"
+    return text
+
+
+def clamp_message(text: str, limit: int = 3900) -> str:
+    if len(text) <= limit:
+        return text
+    return text[: limit - 80] + "\n...сообщение укорочено, отфильтруйте список"
 
 
 async def start_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
@@ -63,7 +82,7 @@ async def callback_handler(update: Update, context: ContextTypes.DEFAULT_TYPE) -
     client: BoincClient = context.bot_data["boinc_client"]
     view: View = query.data if query.data in {"dashboard", "active", "queued", "completed"} else "dashboard"
     try:
-        text = await render_view(view, client)
+        text = clamp_message(await render_view(view, client))
     except Exception as exc:  # broad catch to show meaningful message in chat
         logger.exception("Error rendering view %s", view)
         text = f"Не удалось получить данные: {exc}"