Move Throttling manager to Dispatcher.

aiogram/utils/exceptions.py

@@ -1,3 +1,5 @@
+import time
+
 _PREFIXES = ['Error: ', '[Error]: ', 'Bad Request: ', 'Conflict: ']
 
 
@@ -51,3 +53,21 @@ class MigrateToChat(TelegramAPIError):
     def __init__(self, chat_id):
         super(MigrateToChat, self).__init__(f"The group has been migrated to a supergroup. New id: {chat_id}.")
         self.migrate_to_chat_id = chat_id
+
+
+class Throttled(Exception):
+    def __init__(self, **kwargs):
+        from ..dispatcher.storage import DELTA, EXCEEDED_COUNT, KEY, LAST_CALL, RATE_LIMIT, RESULT
+        self.key = kwargs.pop(KEY, '<None>')
+        self.called_at = kwargs.pop(LAST_CALL, time.time())
+        self.rate = kwargs.pop(RATE_LIMIT, None)
+        self.result = kwargs.pop(RESULT, False)
+        self.exceeded_count = kwargs.pop(EXCEEDED_COUNT, 0)
+        self.delta = kwargs.pop(DELTA, 0)
+        self.user = kwargs.pop('user', None)
+        self.chat = kwargs.pop('chat', None)
+
+    def __str__(self):
+        return f"Rate limit exceeded! (Limit: {self.rate} s, " \
+               f"exceeded: {self.exceeded_count}, " \
+               f"time delta: {round(self.delta, 3)} s)"