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Avoid repeatedly appending to yaml_implicit_resolvers #441

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merged 1 commit into from Jan 13, 2021

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psphicas
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Repeated calls to resolve can experience performance degredation, if
add_implicit_resolver has been called with first=None (to add an
implicit resolver with an unspecified first character).

For example, every time foo is encountered, the "wildcard implicit
resolvers" (with first=None) will be appended to the list of implicit
resolvers for strings starting with f, which will normally be the
resolver for booleans. The list yaml_implicit_resolvers['f'] will keep
getting longer. The same behavior applies for any first-letter matches
with existing implicit resolvers.

This change avoids unintentionally mutating the lists in the class-level
dict yaml_implicit_resolvers by looping through a temporary copy.

Fixes: #439

Repeated calls to `resolve` can experience performance degredation, if
`add_implicit_resolver` has been called with `first=None` (to add an
implicit resolver with an unspecified first character).

For example, every time `foo` is encountered, the "wildcard implicit
resolvers" (with `first=None`) will be appended to the list of implicit
resolvers for strings starting with `f`, which will normally be the
resolver for booleans. The list `yaml_implicit_resolvers['f']` will keep
getting longer. The same behavior applies for any first-letter matches
with existing implicit resolvers.

This change avoids unintentionally mutating the lists in the class-level
dict `yaml_implicit_resolvers` by looping through a temporary copy.

Fixes: yaml#439
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@perlpunk perlpunk left a comment

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Cool!
There was already the PR #73 and the issue #67 , but the PR tests failed, and I hadn't gotten around debugging it.

@philsphicas
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Lol, I should learn how to search better :)

@ingydotnet ingydotnet changed the base branch from master to release/5.4 January 13, 2021 21:18
@ingydotnet ingydotnet merged commit 766b569 into yaml:release/5.4 Jan 13, 2021
asherf added a commit to asherf/pants that referenced this pull request Jan 21, 2021
5.4.1 (2021-01-20)

* yaml/pyyaml#480 -- Fix stub compat with older pyyaml versions that may unwittingly load it

5.4 (2021-01-19)

* yaml/pyyaml#407 -- Build modernization, remove distutils, fix metadata, build wheels, CI to GHA
* yaml/pyyaml#472 -- Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader
* yaml/pyyaml#441 -- Fix memory leak in implicit resolver setup
* yaml/pyyaml#392 -- Fix py2 copy support for timezone objects
* yaml/pyyaml#378 -- Fix compatibility with Jython

https://github.com/yaml/pyyaml/blob/master/CHANGES
stuhood pushed a commit to pantsbuild/pants that referenced this pull request Jan 21, 2021
5.4.1 (2021-01-20)

* yaml/pyyaml#480 -- Fix stub compat with older pyyaml versions that may unwittingly load it

5.4 (2021-01-19)

* yaml/pyyaml#407 -- Build modernization, remove distutils, fix metadata, build wheels, CI to GHA
* yaml/pyyaml#472 -- Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader
* yaml/pyyaml#441 -- Fix memory leak in implicit resolver setup
* yaml/pyyaml#392 -- Fix py2 copy support for timezone objects
* yaml/pyyaml#378 -- Fix compatibility with Jython

https://github.com/yaml/pyyaml/blob/master/CHANGES
otc-zuul bot pushed a commit to opentelekomcloud-infra/customer-service-monitoring that referenced this pull request Mar 29, 2021
Bump pyyaml from 5.3.1 to 5.4 in /roles/prepare_build/files

Bumps pyyaml from 5.3.1 to 5.4.

Changelog
Sourced from pyyaml's changelog.

5.4 (2021-01-19)

yaml/pyyaml#407 -- Build modernization, remove distutils, fix metadata, build wheels, CI to GHA
yaml/pyyaml#472 -- Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader
yaml/pyyaml#441 -- Fix memory leak in implicit resolver setup
yaml/pyyaml#392 -- Fix py2 copy support for timezone objects
yaml/pyyaml#378 -- Fix compatibility with Jython




Commits

58d0cb7 5.4 release
a60f7a1 Fix compatibility with Jython
ee98abd Run CI on PR base branch changes
ddf2033 constructor.timezone: _copy & deepcopy
fc914d5 Avoid repeatedly appending to yaml_implicit_resolvers
a001f27 Fix for CVE-2020-14343
fe15062 Add 3.9 to appveyor file for completeness sake
1e1c7fb Add a newline character to end of pyproject.toml
0b6b7d6 Start sentences and phrases for capital letters
c976915 Shell code improvements
Additional commits viewable in compare view




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Reviewed-by: None <None>
Reviewed-by: Anton Kachurin <katchuring@gmail.com>
Reviewed-by: Anton Sidelnikov <None>
mtremer pushed a commit to ipfire/ipfire-2.x that referenced this pull request Feb 14, 2022
- Update from 3.13 to 6.0
- Update of rootfile
- Changelog
6.0 (2021-10-13)
* yaml/pyyaml#327 -- Change README format to Markdown
* yaml/pyyaml#483 -- Add a test for YAML 1.1 types
* yaml/pyyaml#497 -- fix float resolver to ignore `.` and `._`
* yaml/pyyaml#550 -- drop Python 2.7
* yaml/pyyaml#553 -- Fix spelling of “hexadecimal”
* yaml/pyyaml#556 -- fix representation of Enum subclasses
* yaml/pyyaml#557 -- fix libyaml extension compiler warnings
* yaml/pyyaml#560 -- fix ResourceWarning on leaked file descriptors
* yaml/pyyaml#561 -- always require `Loader` arg to `yaml.load()`
* yaml/pyyaml#564 -- remove remaining direct distutils usage
5.4.1 (2021-01-20)
* yaml/pyyaml#480 -- Fix stub compat with older pyyaml versions that may unwittingly load it
5.4 (2021-01-19)
* yaml/pyyaml#407 -- Build modernization, remove distutils, fix metadata, build wheels, CI to GHA
* yaml/pyyaml#472 -- Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader
* yaml/pyyaml#441 -- Fix memory leak in implicit resolver setup
* yaml/pyyaml#392 -- Fix py2 copy support for timezone objects
* yaml/pyyaml#378 -- Fix compatibility with Jython
5.3.1 (2020-03-18)
* yaml/pyyaml#386 -- Prevents arbitrary code execution during python/object/new constructor
5.3 (2020-01-06)
* yaml/pyyaml#290 -- Use `is` instead of equality for comparing with `None`
* yaml/pyyaml#270 -- Fix typos and stylistic nit
* yaml/pyyaml#309 -- Fix up small typo
* yaml/pyyaml#161 -- Fix handling of __slots__
* yaml/pyyaml#358 -- Allow calling add_multi_constructor with None
* yaml/pyyaml#285 -- Add use of safe_load() function in README
* yaml/pyyaml#351 -- Fix reader for Unicode code points over 0xFFFF
* yaml/pyyaml#360 -- Enable certain unicode tests when maxunicode not > 0xffff
* yaml/pyyaml#359 -- Use full_load in yaml-highlight example
* yaml/pyyaml#244 -- Document that PyYAML is implemented with Cython
* yaml/pyyaml#329 -- Fix for Python 3.10
* yaml/pyyaml#310 -- Increase size of index, line, and column fields
* yaml/pyyaml#260 -- Remove some unused imports
* yaml/pyyaml#163 -- Create timezone-aware datetimes when parsed as such
* yaml/pyyaml#363 -- Add tests for timezone
5.2 (2019-12-02)
* Repair incompatibilities introduced with 5.1. The default Loader was changed,
  but several methods like add_constructor still used the old default
  yaml/pyyaml#279 -- A more flexible fix for custom tag constructors
  yaml/pyyaml#287 -- Change default loader for yaml.add_constructor
  yaml/pyyaml#305 -- Change default loader for add_implicit_resolver, add_path_resolver
* Make FullLoader safer by removing python/object/apply from the default FullLoader
  yaml/pyyaml#347 -- Move constructor for object/apply to UnsafeConstructor
* Fix bug introduced in 5.1 where quoting went wrong on systems with sys.maxunicode <= 0xffff
  yaml/pyyaml#276 -- Fix logic for quoting special characters
* Other PRs:
  yaml/pyyaml#280 -- Update CHANGES for 5.1
5.1.2 (2019-07-30)
* Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b2+
5.1.1 (2019-06-05)
* Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b1
5.1 (2019-03-13)
* yaml/pyyaml#35 -- Some modernization of the test running
* yaml/pyyaml#42 -- Install tox in a virtualenv
* yaml/pyyaml#45 -- Allow colon in a plain scalar in a flow context
* yaml/pyyaml#48 -- Fix typos
* yaml/pyyaml#55 -- Improve RepresenterError creation
* yaml/pyyaml#59 -- Resolves #57, update readme issues link
* yaml/pyyaml#60 -- Document and test Python 3.6 support
* yaml/pyyaml#61 -- Use Travis CI built in pip cache support
* yaml/pyyaml#62 -- Remove tox workaround for Travis CI
* yaml/pyyaml#63 -- Adding support to Unicode characters over codepoint 0xffff
* yaml/pyyaml#75 -- add 3.12 changelog
* yaml/pyyaml#76 -- Fallback to Pure Python if Compilation fails
* yaml/pyyaml#84 -- Drop unsupported Python 3.3
* yaml/pyyaml#102 -- Include license file in the generated wheel package
* yaml/pyyaml#105 -- Removed Python 2.6 & 3.3 support
* yaml/pyyaml#111 -- Remove commented out Psyco code
* yaml/pyyaml#129 -- Remove call to `ord` in lib3 emitter code
* yaml/pyyaml#149 -- Test on Python 3.7-dev
* yaml/pyyaml#158 -- Support escaped slash in double quotes "\/"
* yaml/pyyaml#175 -- Updated link to pypi in release announcement
* yaml/pyyaml#181 -- Import Hashable from collections.abc
* yaml/pyyaml#194 -- Reverting yaml/pyyaml#74
* yaml/pyyaml#195 -- Build libyaml on travis
* yaml/pyyaml#196 -- Force cython when building sdist
* yaml/pyyaml#254 -- Allow to turn off sorting keys in Dumper (2)
* yaml/pyyaml#256 -- Make default_flow_style=False
* yaml/pyyaml#257 -- Deprecate yaml.load and add FullLoader and UnsafeLoader classes
* yaml/pyyaml#261 -- Skip certain unicode tests when maxunicode not > 0xffff
* yaml/pyyaml#263 -- Windows Appveyor build

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>

 --git a/config/rootfiles/packages/python3-yaml b/config/rootfiles/packages/python3-yaml
x 0870a2346..bd4009a08 100644
* yaml/pyyaml#195 -- Build libyaml on travis
* yaml/pyyaml#196 -- Force cython when building sdist
* yaml/pyyaml#254 -- Allow to turn off sorting keys in Dumper (2)
* yaml/pyyaml#256 -- Make default_flow_style=False
* yaml/pyyaml#257 -- Deprecate yaml.load and add FullLoader and Uns
oader classes
* yaml/pyyaml#261 -- Skip certain unicode tests when maxunicode not
xffff
* yaml/pyyaml#263 -- Windows Appveyor build

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>
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safe_load with implicit_resolver slows down
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