New exception class for multiple errors (#965)

telethon/client/users.py

@@ -6,6 +6,7 @@ import time
 from .telegrambaseclient import TelegramBaseClient
 from .. import errors, utils
 from ..tl import TLObject, TLRequest, types, functions
+from ..errors import MultiError, RPCError
 
 __log__ = logging.getLogger(__name__)
 _NOT_A_REQUEST = TypeError('You can only invoke requests, not types!')
@@ -13,7 +14,8 @@ _NOT_A_REQUEST = TypeError('You can only invoke requests, not types!')
 
 class UserMethods(TelegramBaseClient):
     async def __call__(self, request, ordered=False):
-        for r in (request if utils.is_list_like(request) else (request,)):
+        requests = (request if utils.is_list_like(request) else (request,))
+        for r in requests:
             if not isinstance(r, TLRequest):
                 raise _NOT_A_REQUEST
             await r.resolve(self, utils)
@@ -38,11 +40,21 @@ class UserMethods(TelegramBaseClient):
                 future = self._sender.send(request, ordered=ordered)
                 if isinstance(future, list):
                     results = []
+                    exceptions = []
                     for f in future:
+                        try:
                             result = await f
+                        except RPCError as e:
+                            exceptions.append(e)
+                            results.append(None)
+                            continue
                         self.session.process_entities(result)
+                        exceptions.append(None)
                         results.append(result)
                         request_index += 1
+                    if exceptions:
+                        raise MultiError(exceptions, results, requests)
+                    else:
                         return results
                 else:
                     result = await future

telethon/errors/__init__.py

@@ -8,7 +8,7 @@ from threading import Thread
 
 from .common import (
     ReadCancelledError, TypeNotFoundError, InvalidChecksumError,
-    BrokenAuthKeyError, SecurityError, CdnFileTamperedError
+    BrokenAuthKeyError, SecurityError, CdnFileTamperedError, MultiError
 )
 
 # This imports the base errors too, as they're imported there

telethon/errors/common.py

@@ -1,4 +1,5 @@
 """Errors not related to the Telegram API itself"""
+from ..tl import TLRequest
 
 
 class ReadCancelledError(Exception):
@@ -67,3 +68,29 @@ class CdnFileTamperedError(SecurityError):
         super().__init__(
             'The CDN file has been altered and its download cancelled.'
         )
+
+
+class MultiError(Exception):
+    """Exception container for multiple `TLRequest`'s."""
+
+    def __new__(cls, exceptions, result, requests):
+        if len(result) != len(exceptions) != len(requests):
+            raise ValueError(
+                'Need result, exception and request for each error')
+        for e, req in zip(exceptions, requests):
+            if not isinstance(e, BaseException):
+                raise TypeError(
+                    'Expected and exception object, not %r' % e
+                )
+            if not isinstance(req, TLRequest):
+                raise TypeError(
+                    'Expected TLRequest object, not %r' % req
+                )
+
+        if len(exceptions) == 1:
+            return exceptions[0]
+        self = BaseException.__new__(cls)
+        self.exceptions = list(exceptions)
+        self.results = list(result)
+        self.requests = list(requests)
+        return self