Report errors to pwrtelegram.xyz by default

README-long.rst

@@ -263,3 +263,17 @@ Once this is done, pass the proxy settings to the ``TelegramClient`` constructor
 
 The ``proxy=`` argument should be a tuple, a list or a dict, consisting of parameters described
 `here <https://github.com/Anorov/PySocks#usage-1>`_.
+
+API status
+----------
+
+In an attempt to help everyone who works with the Telegram API, Telethon
+will by default report all Remote Procedure Call errors to
+`PWRTelegram <https://pwrtelegram.xyz/>`_, a public database anyone
+can query, made by `Daniil <https://github.com/danog>`_. All the information
+sent is a ``GET`` request with the error code, error message and method used.
+
+If you still would like to opt out, simply set
+``client.session.report_errors = False`` to disable this feature. However
+Daniil would really thank you if you helped him (and everyone) by keeping
+it on!

telethon/errors/__init__.py

@@ -1,3 +1,4 @@
+import urllib.request
 import re
 
 from .common import (
@@ -16,7 +17,22 @@ from .rpc_errors_401 import *
 from .rpc_errors_420 import *
 
 
-def rpc_message_to_error(code, message):
+def rpc_message_to_error(code, message, report_method=None):
+    if report_method is not None:
+        try:
+            # Ensure it's signed
+            report_method = int.from_bytes(
+                report_method.to_bytes(4, 'big'), 'big', signed=True
+            )
+            url = urllib.request.urlopen(
+                'https://rpc.pwrtelegram.xyz?code={}&error={}&method={}'
+                .format(code, message, report_method)
+            )
+            url.read()
+            url.close()
+        except:
+            "We really don't want to crash when just reporting an error"
+
     errors = {
         303: rpc_errors_303_all,
         400: rpc_errors_400_all,

telethon/network/mtproto_sender.py

@@ -344,8 +344,15 @@ class MtProtoSender:
             request = None
 
         if inner_code == 0x2144ca19:  # RPC Error
+            if self.session.report_errors and request:
                 error = rpc_message_to_error(
-                reader.read_int(), reader.tgread_string())
+                    reader.read_int(), reader.tgread_string(),
+                    report_method=type(request).constructor_id
+                )
+            else:
+                error = rpc_message_to_error(
+                    reader.read_int(), reader.tgread_string()
+                )
 
             # Acknowledge that we received the error
             self._need_confirmation.append(request_id)

telethon/tl/session.py

@@ -109,6 +109,7 @@ class JsonSession:
             self.lang_code = session.lang_code
             self.system_lang_code = session.system_lang_code
             self.lang_pack = session.lang_pack
+            self.report_errors = session.report_errors
 
         else:  # str / None
             self.session_user_id = session_user_id
@@ -120,6 +121,7 @@ class JsonSession:
             self.lang_code = 'en'
             self.system_lang_code = self.lang_code
             self.lang_pack = ''
+            self.report_errors = True
 
         # Cross-thread safety
         self._lock = Lock()