⚡ Bolt: Optimize regex caching and syscalls in history.py - #83
Conversation
- Pre-compile `_YT_ID_PATTERN`, `_VIMEO_ID_PATTERN`, and `_HANDLE_PATTERN` in `history.py`. - Apply EAFP pattern to file existence checks `_load_existing_json_safely` and `_cleanup_legacy_json` to reduce syscalls. Co-authored-by: Jandir <3695656+Jandir@users.noreply.github.com>
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💡 What:
_YT_ID_PATTERN,_VIMEO_ID_PATTERN,_HANDLE_PATTERN) at the module level inhistory.pyto avoid cache lookup and instantiation overhead in hot loops (e.g.,_deduplicate_videos)..exists()"Look Before You Leap" (LBYL) checks withtry/except OSErrorblocks and leveragingmissing_ok=Trueforunlink().🎯 Why:
re.matchinline requires theremodule to check its internal cache or compile the pattern on the fly. Doing this inside loops like_populate_history_from_listand_deduplicate_videosadds unnecessary overhead..exists()right before.open()or.unlink()introduces redundantstat()system calls to the operating system.📊 Impact:
Reduces execution time for history parsing and deduplication loops, scaling with the number of videos. Cuts
stat()system calls in half during database cleanup and load operations.🔬 Measurement:
Run the application with a large history JSON. Profiling execution of
_deduplicate_videosand monitoringstracefor file metadata syscalls should demonstrate noticeable improvements. All tests continue to pass.PR created automatically by Jules for task 15364104595561032809 started by @Jandir