Added and updated documentation

tl/mtproto_request.py

@@ -0,0 +1,41 @@
+# This file is based on TLSharp
+# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/Requests/MTProtoRequest.cs
+from datetime import datetime, timedelta
+
+
+class MTProtoRequest:
+    def __init__(self):
+        self.sent = False
+
+        self.msg_id = 0  # Long
+        self.sequence = 0
+
+        self.dirty = False
+        self.send_time = None
+        self.confirm_received = False
+
+        # These should be overrode
+        self.confirmed = False
+        self.responded = False
+
+    # These should not be overrode
+    def on_send_success(self):
+        self.send_time = datetime.now()
+        self.sent = True
+
+    def on_confirm(self):
+        self.confirm_received = True
+
+    def need_resend(self):
+        return self.dirty or (self.confirmed and not self.confirm_received and
+                              datetime.now() - self.send_time > timedelta(seconds=3))
+
+    # These should be overrode
+    def on_send(self, writer):
+        pass
+
+    def on_response(self, reader):
+        pass
+
+    def on_exception(self, exception):
+        pass