Fix memoisation of lazy parser & bump version#255
Merged
masklinn merged 1 commit intoua-parser:masterfrom Feb 1, 2025
Merged
Conversation
Reported by @Rafiot: the lazy parser is not memoised, this has limited effect on the basic / pure Python parser as its initialisation is trivial, but it *significantly* impact the re2 and regex parsers as they need to process regexes into a filter tree. The memoization was mistakenly removed in ua-parser#230: while refactoring initialisation I removed the setting of the `parser` global. - add a test to ensure the parser is correctly memoized, not re-instantiated every time - reinstate setting the global - add a mutex on `__getattr__`, it should only be used on first access and avoids two threads creating an expensive parser at the same time (which is a waste of CPU) Fixes ua-parser#253
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Reported by @Rafiot: the lazy parser is not memoised, this has limited effect on the basic / pure Python parser as its initialisation is trivial, but it significantly impact the re2 and regex parsers as they need to process regexes into a filter tree.
The memoization was mistakenly removed in #230: while refactoring initialisation I removed the setting of the
parserglobal.__getattr__, it should only be used on first access and avoids two threads creating an expensive parser at the same time (which is a waste of CPU)Fixes #253