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Delay deciding which cancel scope a Cancelled exception belongs to#901

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oremanj merged 3 commits intopython-trio:masterfrom
oremanj:delaycancel
Feb 5, 2019
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Delay deciding which cancel scope a Cancelled exception belongs to#901
oremanj merged 3 commits intopython-trio:masterfrom
oremanj:delaycancel

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@oremanj oremanj commented Feb 4, 2019

Fixes #860.

@oremanj oremanj requested a review from njsmith February 4, 2019 01:22
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codecov bot commented Feb 4, 2019

Codecov Report

Merging #901 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
- Coverage   99.53%   99.53%   -0.01%     
==========================================
  Files         102      102              
  Lines       12411    12397      -14     
  Branches      916      915       -1     
==========================================
- Hits        12353    12339      -14     
  Misses         36       36              
  Partials       22       22
Impacted Files Coverage Δ
trio/_core/_exceptions.py 100% <ø> (ø) ⬆️
trio/_core/tests/test_run.py 100% <100%> (ø) ⬆️
trio/tests/test_highlevel_open_tcp_stream.py 100% <100%> (ø) ⬆️
trio/_core/_run.py 99.7% <100%> (-0.01%) ⬇️

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codecov bot commented Feb 4, 2019 •
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Codecov Report

Merging #901 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
- Coverage   99.53%   99.53%   -0.01%     
==========================================
  Files         102      102              
  Lines       12411    12409       -2     
  Branches      916      915       -1     
==========================================
- Hits        12353    12351       -2     
  Misses         36       36              
  Partials       22       22
Impacted Files Coverage Δ
trio/_core/_exceptions.py 100% <ø> (ø) ⬆️
trio/_core/tests/test_run.py 100% <100%> (ø) ⬆️
trio/tests/test_highlevel_open_tcp_stream.py 100% <100%> (ø) ⬆️
trio/_core/_run.py 99.7% <100%> (-0.01%) ⬇️
trio/_core/tests/test_multierror.py 100% <0%> (ø) ⬆️

njsmith
njsmith reviewed Feb 4, 2019
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Huh, this is simpler than I was expecting :-)

trio/_core/_exceptions.py Outdated
crash your program. Use :meth:`cancel_scope.cancel()
<trio.CancelScope.cancel>` instead, so Trio can maintain the
invariant that a :exc:`Cancelled` exception only gets raised when
there's a cancelled cancel scope that's intended to catch it.
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This is probably more details on the internals than we really want people thinking about. How about simplifying down to just: "You cannot raise Cancelled yourself. Attempting to do so will produce a RuntimeError. Use cancel_scope.cancel instead."

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oremanj commented Feb 4, 2019

The 3.8-dev failure in Travis is unrelated, so I think this is ready.

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njsmith commented Feb 4, 2019

LGTM. That travis failure is annoying... I just filed a bug on CPython (bpo-35894), so hopefully it will be fixed soon. In the mean time though our CI is broken. I guess we need to temporarily disable the 3.8-dev test (or mark it "allowed to fail") until that's fixed?

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njsmith commented Feb 5, 2019

Closing/opening to tickle CI, now that #905 is merged.

@njsmith njsmith closed this Feb 5, 2019
@njsmith njsmith reopened this Feb 5, 2019
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oremanj commented Feb 5, 2019

This time py37_latest_ubuntu on Azure seems to have timed out before it ran any of our code (reeeally slow downloading packages). I... guess I'll try again?

@oremanj oremanj closed this Feb 5, 2019
@oremanj oremanj reopened this Feb 5, 2019
@oremanj oremanj merged commit 3aaa6ba into python-trio:master Feb 5, 2019
oremanj added a commit to oremanj/trio that referenced this pull request Feb 5, 2019
@oremanj
Cancel a cancel scope upon entry if its deadline is in the past
75725a8 
Fixes python-trio#320. Now that python-trio#901 is implemented, the concerns discussed in python-trio#835 don't apply.
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@oremanj oremanj mentioned this pull request Mar 1, 2019
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