Several updates, fixes and additions (TcpClient, MtProto...)

README.md was updated to reflect more useful information
More errors from the official Telegrm website have been added
MtProtoSender now handles updates (and doesn't crash!)
Fixes on TcpClient to be able to receive whole large packets
Updated scheme.tl to the layer 55
Session is now saved more often (to prevent damages from crashes)
Fixes to the code generator (generated invalid code for reading "bytes")

network/mtproto_sender.py

@@ -17,6 +17,12 @@ class MtProtoSender:
         self.transport = transport
         self.session = session
         self.need_confirmation = []  # Message IDs that need confirmation
+        self.on_update_handlers = []
+
+    def add_update_handler(self, handler):
+        """Adds an update handler (a method with one argument, the received TLObject)
+        that is fired when there are updates available"""
+        self.on_update_handlers.append(handler)
 
     def generate_sequence(self, confirmed):
         """Generates the next sequence number, based on whether it was confirmed yet or not"""
@@ -29,7 +35,6 @@ class MtProtoSender:
 
     # region Send and receive
 
-    # TODO In TLSharp, this was async. Should this be?
     def send(self, request):
         """Sends the specified MTProtoRequest, previously sending any message which needed confirmation"""
 
@@ -57,6 +62,7 @@ class MtProtoSender:
             with BinaryReader(message) as reader:
                 self.process_msg(remote_msg_id, remote_sequence, reader, request)
 
+
     # endregion
 
     # region Low level processing
@@ -144,12 +150,9 @@ class MtProtoSender:
         if code == 0x3072cfa1:  # gzip_packed
             return self.handle_gzip_packed(msg_id, sequence, reader, request)
 
-        if (code == 0xe317af7e or
-            code == 0xd3f45784 or
-            code == 0x2b2fbd4e or
-            code == 0x78d4dec1 or
-            code == 0x725b04c3 or
-                code == 0x74ae4240):
+        # TODO do not check by hand, keep another list of which are updates (from the .tl definition)
+        updates = [0xe317af7e, 0x914fbf11, 0x16812688, 0x78d4dec1, 0x725b04c3, 0x74ae4240, 0x11f1331c]
+        if code in updates:
             return self.handle_update(msg_id, sequence, reader)
 
         print('Unknown message: {}'.format(hex(msg_id)))
@@ -160,6 +163,10 @@ class MtProtoSender:
     # region Message handling
 
     def handle_update(self, msg_id, sequence, reader):
+        tlobject = reader.tgread_object()
+        for handler in self.on_update_handlers:
+            handler(tlobject)
+
         return False
 
     def handle_container(self, msg_id, sequence, reader, request):
@@ -170,17 +177,9 @@ class MtProtoSender:
             inner_sequence = reader.read_int()
             inner_length = reader.read_int()
             begin_position = reader.tell_position()
-            try:
-                if not self.process_msg(inner_msg_id, sequence, reader, request):
-                    reader.set_position(begin_position + inner_length)
 
-            except Exception as error:
-                if error is InvalidDCError:
-                    print('Re-raise {}'.format(error))
-                    raise error
-                else:
-                    print('Error while handling container {}: {}'.format(type(error), error))
-                    reader.set_position(begin_position + inner_length)
+            if not self.process_msg(inner_msg_id, sequence, reader, request):
+                reader.set_position(begin_position + inner_length)
 
         return False
 
@@ -231,34 +230,35 @@ class MtProtoSender:
     def handle_rpc_result(self, msg_id, sequence, reader, mtproto_request):
         code = reader.read_int(signed=False)
         request_id = reader.read_long(signed=False)
+        inner_code = reader.read_int(signed=False)
 
         if request_id == mtproto_request.msg_id:
             mtproto_request.confirm_received = True
 
-        inner_code = reader.read_int(signed=False)
         if inner_code == 0x2144ca19:  # RPC Error
-            error_code = reader.read_int()
-            error_msg = reader.tgread_string()
+            error = RPCError(code=reader.read_int(), message=reader.tgread_string())
+            if error.must_resend:
+                mtproto_request.confirm_received = False
 
-            if error_msg.startswith('FLOOD_WAIT_'):
-                seconds = int(re.search(r'\d+', error_msg).group(0))
-                print('Should wait {}s. Sleeping until then.')
-                sleep(seconds)
+            if error.message.startswith('FLOOD_WAIT_'):
+                print('Should wait {}s. Sleeping until then.'.format(error.additional_data))
+                sleep(error.additional_data)
+
+            elif error.message.startswith('PHONE_MIGRATE_'):
+                raise InvalidDCError(error.additional_data)
 
-            elif error_msg.startswith('PHONE_MIGRATE_'):
-                dc_index = int(re.search(r'\d+', error_msg).group(0))
-                raise InvalidDCError(dc_index)
             else:
-                raise RPCError(error_msg)
-
-        elif inner_code == 0x3072cfa1:  # GZip packed
-            unpacked_data = gzip.decompress(reader.tgread_bytes())
-            with BinaryReader(unpacked_data) as compressed_reader:
-                mtproto_request.on_response(compressed_reader)
+                raise error
 
         else:
-            reader.seek(-4)
-            mtproto_request.on_response(reader)
+            if inner_code == 0x3072cfa1:  # GZip packed
+                unpacked_data = gzip.decompress(reader.tgread_bytes())
+                with BinaryReader(unpacked_data) as compressed_reader:
+                    mtproto_request.on_response(compressed_reader)
+
+            else:
+                reader.seek(-4)
+                mtproto_request.on_response(reader)
 
     def handle_gzip_packed(self, msg_id, sequence, reader, mtproto_request):
         code = reader.read_int(signed=False)