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Fix #4013 _resolve_host race conditions#4014

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asvetlov merged 6 commits intoaio-libs:masterfrom
ojii:resolve-host-race-conditions
Aug 31, 2019
Merged

Fix #4013 _resolve_host race conditions#4014
asvetlov merged 6 commits intoaio-libs:masterfrom
ojii:resolve-host-race-conditions

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@ojii ojii commented Aug 29, 2019

What do these changes do?

Fixes #4013 by removing possible context switches between dictionary/cache tests and accessing those dictionaries/caches.

Are there changes in behavior for the user?

Related issue number

Fixes #4013

Checklist

  • I think the code is well written
  • Unit tests for the changes exist
  • Documentation reflects the changes
  • If you provide code modification, please add yourself to CONTRIBUTORS.txt
    • The format is <Name> <Surname>.
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    • name it <issue_id>.<type> for example (588.bugfix)
    • if you don't have an issue_id change it to the pr id after creating the pr
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    • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

@ojii ojii requested a review from asvetlov as a code owner August 29, 2019 07:48
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webknjaz commented Aug 29, 2019

@ojii this PR causes linter failures. Please fix those and go through the checklist above ☝️

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@webknjaz webknjaz closed this Aug 29, 2019
@webknjaz webknjaz reopened this Aug 29, 2019
@ojii ojii requested a review from webknjaz as a code owner August 29, 2019 10:33
@psf-chronographer psf-chronographer bot added the bot:chronographer:provided There is a change note present in this PR label Aug 29, 2019
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@ojii ojii force-pushed the resolve-host-race-conditions branch from ccfc90a to e44fe14 Compare August 29, 2019 10:37
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LGTM.
The PR should be backported to 3.6 branch on merging

@webknjaz webknjaz removed their request for review August 29, 2019 20:06
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I won't review this PR, plz handle the merge/backport this w/o me.

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dimaqq commented Aug 30, 2019

👍
I wish the new tests made it clearer what was being tested, for example DummyTracer is hardly a good name for "tracer with a side effect that simulates another coro calling resolver which may change shared data", but I guess that's minor...

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Comments can help to keep the (not very obvious) change after future edits

ojii and others added 3 commits August 30, 2019 19:21
Co-Authored-By: Andrew Svetlov <[email protected]>
Co-Authored-By: Andrew Svetlov <[email protected]>
Co-Authored-By: Andrew Svetlov <[email protected]>
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asvetlov commented Aug 30, 2019

Regarding @dimaqq note I can live with the current naming but if you guys want to use more meaningful names -- you are welcome.

@asvetlov asvetlov merged commit 010caab into aio-libs:master Aug 31, 2019
asvetlov pushed a commit that referenced this pull request Aug 31, 2019
(cherry picked from commit 010caab)

Co-authored-by: Jonas Obrist <[email protected]>
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Thanks!

asvetlov added a commit that referenced this pull request Aug 31, 2019
(cherry picked from commit 010caab)

Co-authored-by: Jonas Obrist <[email protected]>
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Potential cache/throttle race conditions in Connector._resolve_host with traces

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