Travis CI: documentation job fails in library/nntplib.rst with random network issue on news.gmane.io

[vstinner]

BPO	39343
Nosy	@terryjreedy, @ned-deily, @cjerdonek, @corona10
PRs	bpo-39343: Skip doctest in library/nntplib.rst #18013

^{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 = None
created_at = <Date 2020-01-15.10:22:54.720>
labels = ['tests', '3.9']
title = 'Travis CI: documentation job fails in library/nntplib.rst with random network issue on news.gmane.io'
updated_at = <Date 2020-06-01.19:08:06.992>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-06-01.19:08:06.992>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2020-01-15.10:22:54.720>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39343
keywords = ['patch']
message_count = 10.0
messages = ['360039', '360052', '360054', '360058', '360060', '360061', '360062', '360216', '369694', '370343']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'ned.deily', 'chris.jerdonek', 'corona10']
pr_nums = ['18013']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue39343'
versions = ['Python 3.9']

[vstinner]

Should we disable documentation test on nntplib? It's surprising that test_nntplib test on the other Travis CI jobs.

https://travis-ci.org/python/cpython/jobs/637325027

Warning, treated as error:

---

File "library/nntplib.rst", line ?, in default

Failed example:

    s = NNTP('news.gmane.io')

Exception raised:

    Traceback (most recent call last):

  File "/home/travis/build/python/cpython/Lib/doctest.py", line 1329, in __run

    exec(compile(example.source, filename, "single",

  File "<doctest default[0]>", line 1, in <module>

        s = NNTP('news.gmane.io')

  File "/home/travis/build/python/cpython/Lib/nntplib.py", line 1045, in __init__

        self.sock = self._create_socket(timeout)

  File "/home/travis/build/python/cpython/Lib/nntplib.py", line 1062, in _create_socket

        return socket.create_connection((self.host, self.port), timeout)

  File "/home/travis/build/python/cpython/Lib/socket.py", line 843, in create_connection

        raise err

  File "/home/travis/build/python/cpython/Lib/socket.py", line 831, in create_connection

        sock.connect(sa)

ConnectionRefusedError: [Errno 111] Connection refused

[corona10]

Same for news.gmane.org

>>> s = nntplib.NNTP('news.gmane.org')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/corona10/oss/cpython/Lib/nntplib.py", line 1045, in __init__
    self.sock = self._create_socket(timeout)
  File "/Users/corona10/oss/cpython/Lib/nntplib.py", line 1062, in _create_socket
    return socket.create_connection((self.host, self.port), timeout)
  File "/Users/corona10/oss/cpython/Lib/socket.py", line 843, in create_connection
    raise err
  File "/Users/corona10/oss/cpython/Lib/socket.py", line 831, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 61] Connection refused

[corona10]

s = nntplib.NNTP('nntp.perl.org')
s = nntplib.NNTP('news.mozilla.org')

I 've checked a few servers list to use.
But I don't know that they are proper to use.

[corona10]

But for now on, IMHO skip is better choice.

[ned-deily]

FYI, gmane.io is down for a server move today. It should be back in service by 2100 GMT.

[vstinner]

FYI, gmane.io is down for a server move today. It should be back in service by 2100 GMT.

I propose to do nothing and wait. Travis CI is not currently preventing to merge a PR.

[ned-deily]

I should have checked first. The move was completed ahead of schedule and it's now back in service. The tests should no loner fail.

https://lars.ingebrigtsen.no/2020/01/15/news-gmane-org-is-now-news-gmane-io/

[vstinner]

It seems like the GMANE server has been fixed.

[cjerdonek]

Reopening as this is happening again -- twice for me: https://github.com/python/cpython/pull/20329/checks?check_run_id=701405252#step:7:117