Fix LogOutRequest consuming all retries (#270)

telethon/network/mtproto_sender.py

@@ -13,6 +13,7 @@ from ..extensions import BinaryReader
 from ..tl import TLMessage, MessageContainer, GzipPacked
 from ..tl.all_tlobjects import tlobjects
 from ..tl.types import MsgsAck
+from ..tl.functions.auth import LogOutRequest
 
 logging.getLogger(__name__).addHandler(logging.NullHandler())
 
@@ -41,10 +42,6 @@ class MtProtoSender:
         self._send_lock = RLock()
         self._recv_lock = RLock()
 
-        # Used when logging out, the only request that seems to use 'ack'
-        # TODO There might be a better way to handle msgs_ack requests
-        self.logging_out = False
-
     def connect(self):
         """Connects to the server"""
         self.connection.connect()
@@ -57,7 +54,6 @@ class MtProtoSender:
         self.connection.close()
         self._need_confirmation.clear()
         self._clear_all_pending()
-        self.logging_out = False
 
     # region Send and receive
 
@@ -201,13 +197,15 @@ class MtProtoSender:
         # msgs_ack, it may handle the request we wanted
         if code == 0x62d6b459:
             ack = reader.tgread_object()
-            # We only care about ack requests if we're logging out
+            # Ignore every ack request *unless* when logging out, when it's
-            if self.logging_out:
+            # when it seems to only make sense. We also need to set a non-None
+            # result since Telegram doesn't send the response for these.
             for msg_id in ack.msg_ids:
-                    r = self._pop_request(msg_id)
+                r = self._pop_request_of_type(msg_id, LogOutRequest)
                 if r:
+                    r.result = True  # Telegram won't send this value
+                    r.confirm_received()
                     self._logger.debug('Message ack confirmed', r)
-                        r.confirm_received.set()
 
             return True
 
@@ -241,6 +239,14 @@ class MtProtoSender:
         if message:
             return message.request
 
+    def _pop_request_of_type(self, msg_id, t):
+        """Pops a pending REQUEST from self._pending_receive if it matches
+           the given type, or returns None if it's not found/doesn't match.
+        """
+        message = self._pending_receive.get(msg_id, None)
+        if isinstance(message.request, t):
+            return self._pending_receive.pop(msg_id).request
+
     def _clear_all_pending(self):
         for r in self._pending_receive.values():
             r.confirm_received.set()

telethon/telegram_client.py

@@ -392,19 +392,12 @@ class TelegramClient(TelegramBareClient):
     def log_out(self):
         """Logs out and deletes the current session.
            Returns True if everything went okay."""
-        # Special flag when logging out (so the ack request confirms it)
-        self._sender.logging_out = True
-
         try:
             self(LogOutRequest())
-            # The server may have already disconnected us, we still
+        except RPCError:
-            # try to disconnect to make sure.
-            self.disconnect()
-        except (RPCError, ConnectionError):
-            # Something happened when logging out, restore the state back
-            self._sender.logging_out = False
             return False
 
+        self.disconnect()
         self.session.delete()
         self.session = None
         return True