bpo-32034: Make IncompleteReadError & LimitOverrunError pickleable GH-4409 (#4411)

(cherry picked from commit 43605e6)

Author: miss-islington

Lib/asyncio/streams.py

@@ -35,6 +35,9 @@ def __init__(self, partial, expected):
  self.partial = partial
  self.expected = expected
 
+ def __reduce__(self):
+ return type(self), (self.partial, self.expected)
+
 
 class LimitOverrunError(Exception):
  """Reached the buffer limit while looking for a separator.
@@ -46,6 +49,9 @@ def __init__(self, message, consumed):
  super().__init__(message)
  self.consumed = consumed
 
+ def __reduce__(self):
+ return type(self), (self.args[0], self.consumed)
+
 
 @coroutine
 def open_connection(host=None, port=None, *,

Lib/test/test_asyncio/test_streams.py

@@ -3,6 +3,7 @@
 import gc
 import os
 import queue
+import pickle
 import socket
 import sys
 import threading
@@ -845,6 +846,23 @@ def test___repr__transport(self):
  stream._transport.__repr__.return_value = "<Transport>"
  self.assertEqual("<StreamReader t=<Transport>>", repr(stream))
 
+ def test_IncompleteReadError_pickleable(self):
+ e = asyncio.IncompleteReadError(b'abc', 10)
+ for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+ with self.subTest(pickle_protocol=proto):
+ e2 = pickle.loads(pickle.dumps(e, protocol=proto))
+ self.assertEqual(str(e), str(e2))
+ self.assertEqual(e.partial, e2.partial)
+ self.assertEqual(e.expected, e2.expected)
+
+ def test_LimitOverrunError_pickleable(self):
+ e = asyncio.LimitOverrunError('message', 10)
+ for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+ with self.subTest(pickle_protocol=proto):
+ e2 = pickle.loads(pickle.dumps(e, protocol=proto))
+ self.assertEqual(str(e), str(e2))
+ self.assertEqual(e.consumed, e2.consumed)
+
 
 if __name__ == '__main__':
  unittest.main()

Misc/NEWS.d/next/Library/2017-11-15-13-44-28.bpo-32034.uHAOmu.rst

@@ -0,0 +1 @@
+Make asyncio.IncompleteReadError and LimitOverrunError pickleable.