Handle the right errors

telethon/extensions/messagepacker.py

@@ -111,6 +111,4 @@ class MessagePacker:
                 s.container_id = container_id
 
         data = buffer.getvalue()
-        __log__.debug('Packed %d message(s) in %d bytes for sending',
-                      len(batch), len(data))
         return batch, data

telethon/network/connection/connection.py

@@ -4,6 +4,8 @@ import logging
 import socket
 import ssl as ssl_mod
 
+from ...errors import InvalidChecksumError
+
 __log__ = logging.getLogger(__name__)
 
 
@@ -173,6 +175,9 @@ class Connection(abc.ABC):
             if isinstance(e, asyncio.IncompleteReadError):
                 msg = 'The server closed the connection'
                 logging.info(msg)
+            elif isinstance(e, InvalidChecksumError):
+                msg = 'The server response had an invalid checksum'
+                logging.info(msg)
             else:
                 msg = 'Unexpected exception in the receive loop'
                 logging.exception(msg)

telethon/network/mtprotosender.py

@@ -196,7 +196,7 @@ class MTProtoSender:
             try:
                 __log__.debug('Connection attempt {}...'.format(retry))
                 await self._connection.connect(timeout=self._connect_timeout)
-            except (OSError, asyncio.TimeoutError) as e:
+            except (ConnectionError, asyncio.TimeoutError) as e:
                 __log__.warning('Attempt {} at connecting failed: {}: {}'
                                 .format(retry, type(e).__name__, e))
             else:
@@ -287,9 +287,6 @@ class MTProtoSender:
         __log__.debug('Awaiting for the receive loop before reconnecting...')
         await self._recv_loop_handle
 
-        __log__.debug('Closing current connection...')
-        self._connection.disconnect()
-
         self._reconnecting = False
 
         # Start with a clean state (and thus session ID) to avoid old msgs
@@ -334,19 +331,31 @@ class MTProtoSender:
                 self._last_acks.append(ack)
                 self._pending_ack.clear()
 
+            __log__.debug('Waiting for messages to send...')
+            # TODO Wait for the connection send queue to be empty?
+            # This means that while it's not empty we can wait for
+            # more messages to be added to the send queue.
+            try:
                 batch, data = await self._send_queue.get(
                     self._connection.disconnected)
+            except asyncio.CancelledError:
+                return
 
             if not data:
                 continue
 
-            try:
-                # TODO Split except
+            __log__.debug('Encrypting %d message(s) in %d bytes for sending',
+                          len(batch), len(data))
+
             data = self._state.encrypt_message_data(data)
+            try:
                 await self._connection.send(data)
-            except Exception:
-                __log__.exception('Unhandled error while sending data')
-                continue
+            except asyncio.CancelledError:
+                return
+            except ConnectionError:
+                __log__.info('Connection closed while sending data')
+                self._start_reconnect()
+                return
 
             for state in batch:
                 if not isinstance(state, list):
@@ -357,6 +366,8 @@ class MTProtoSender:
                         if isinstance(s.request, TLRequest):
                             self._pending_state[s.msg_id] = s
 
+            __log__.debug('Encrypted messages put in a queue to be sent')
+
     async def _recv_loop(self):
         """
         This loop is responsible for reading all incoming responses
@@ -367,10 +378,18 @@ class MTProtoSender:
         while self._user_connected and not self._reconnecting:
             __log__.debug('Receiving items from the network...')
             try:
-                # TODO Split except
                 body = await self._connection.recv()
+            except asyncio.CancelledError:
+                return
+            except ConnectionError:
+                __log__.info('Connection closed while receiving data')
+                self._start_reconnect()
+                return
+
+            try:
                 message = self._state.decrypt_message_data(body)
             except TypeNotFoundError as e:
+                # Received object which we don't know how to deserialize
                 __log__.info('Type %08x not found, remaining data %r',
                              e.invalid_constructor_id, e.remaining)
                 continue
@@ -380,13 +399,6 @@ class MTProtoSender:
                 __log__.warning('Security error while unpacking a '
                                 'received message: %s', e)
                 continue
-            except InvalidChecksumError as e:
-                __log__.warning(
-                    'Invalid checksum on the read packet (was %s expected %s)',
-                    e.checksum, e.valid_checksum
-                )
-            except asyncio.CancelledError:
-                return
             except BufferError as e:
                 if isinstance(e, InvalidBufferError) and e.code == 404:
                     __log__.info('Broken authorization key; resetting')
@@ -396,15 +408,11 @@ class MTProtoSender:
                 self._auth_key.key = None
                 self._start_reconnect()
                 return
-            except asyncio.IncompleteReadError:
-                __log__.info('Telegram closed the connection')
-                self._start_reconnect()
-                return
             except Exception:
                 __log__.exception('Unhandled error while receiving data')
                 self._start_reconnect()
                 return
-            else:
+
             try:
                 await self._process_message(message)
             except Exception: