ClientConnectionError exception doesn't serialize property

[davidparks21]

BPO	38229
Nosy	@asvetlov, @1st1, @pppery, @davidparks21

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-09-20.02:53:03.601>
created_at = <Date 2019-09-20.00:00:39.794>
labels = ['type-bug', 'expert-asyncio']
title = "ClientConnectionError exception doesn't serialize property"
updated_at = <Date 2019-09-20.02:53:03.596>
user = 'https://github.com/davidparks21'

bugs.python.org fields:

activity = <Date 2019-09-20.02:53:03.596>
actor = 'davidparks21'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-20.02:53:03.601>
closer = 'davidparks21'
components = ['asyncio']
creation = <Date 2019-09-20.00:00:39.794>
creator = 'davidparks21'
dependencies = []
files = []
hgrepos = []
issue_num = 38229
keywords = []
message_count = 4.0
messages = ['352818', '352819', '352821', '352823']
nosy_count = 4.0
nosy_names = ['asvetlov', 'yselivanov', 'ppperry', 'davidparks21']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38229'
versions = ['Python 3.6']

[davidparks21]

Original question posted here:

https://stackoverflow.com/questions/58019939/attributeerror-str-object-has-no-attribute-errno?noredirect=1#comment102443264_58019939

The following exception is encountered when placing an aiohttp.client_exceptions.ClientConnectionError on a multiprocessing.Queue. The problem appears to occur during deserialization.

Traceback (most recent call last):
  File "model_neural_simplified.py", line 318, in <module>
    main(**arg_parser())
  File "model_neural_simplified.py", line 314, in main
    globals()[command](**kwargs)
  File "model_neural_simplified.py", line 304, in predict
    next_neural_data, next_sample = reader.get_next_result()
  File "/project_neural_mouse/src/asyncs3/s3reader.py", line 174, in get_next_result
    result = future.result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "model_neural_simplified.py", line 245, in read_sample
    f_bytes = s3f.read(read_size)
  File "/project_neural_mouse/src/asyncs3/s3reader.py", line 374, in read
    size, b = self._issue_request(S3Reader.READ, (self.url, size, self.position))
  File "/project_neural_mouse/src/asyncs3/s3reader.py", line 389, in _issue_request
    response = self.communication_channels[uuid].get()
  File "/usr/lib/python3.6/multiprocessing/queues.py", line 113, in get
    return _ForkingPickler.loads(res)
  File "/usr/local/lib/python3.6/dist-packages/aiohttp/client_exceptions.py", line 133, in __init__
    super().__init__(os_error.errno, os_error.strerror)
AttributeError: 'str' object has no attribute 'errno'

A similar issue is reproducible using the following code snippet:

import multiprocessing
import aiohttp


connection_key = aiohttp.client_reqrep.ConnectionKey
ose = OSError('test')

e = aiohttp.client_exceptions.ClientConnectorError(connection_key, ose)
q = multiprocessing.Queue()

q.put(e)
q.get(e)

[davidparks21]

Minor correction to the minimal reproducible test case:

import multiprocessing
import aiohttp


connection_key = aiohttp.client_reqrep.ConnectionKey
ose = OSError('test')

e = aiohttp.client_exceptions.ClientConnectorError(connection_key, ose)
q = multiprocessing.Queue()

q.put(e)
q.get()

[pppery]

This seems more likely to be a bug in aiohttp than in python.

[davidparks21]

Oh yes, this belongs to aiohttp. I thought that was handled here. I'll move this to a git issue on that page, and I'm closing this.

aio-libs/aiohttp#4077