⚡ Bolt: optimize yEnc body decoding using C-native bytes methods

[xbmc4lyfe]

💡 What: Optimized the yEnc decode body function _decode_yenc_lines by introducing a pre-calculated translate table and replacing the pure-Python byte-by-byte loop with native bytes.translate() and bytes.find() calls.
🎯 Why: Pure-Python iteration and modulo arithmetic on bytes was slow, acting as a CPU bottleneck for deep-checking bodies.
📊 Impact: Expected ~13x performance improvement on yEnc decoding logic (approx. from 0.22s to 0.017s for 10,000 lines).
🔬 Measurement: Run the internal benchmark script on _decode_yenc_lines or run tests via python3 -m unittest -v.

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PR created automatically by Jules for task 15531706038645279370 started by @xbmc4lyfe

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2f974db1-7ec7-43ad-9665-2ec4e5e0e927

📥 Commits

Reviewing files that changed from the base of the PR and between 09ccc06 and 354b6d6.

📒 Files selected for processing (3)

• .gitignore
• .jules/bolt.md
• verify_nzb.py

📜 Recent review details

🔇 Additional comments (3)

.gitignore (1)

8-8: LGTM!

verify_nzb.py (1)

118-118: LGTM!

Also applies to: 122-145

.jules/bolt.md (1)

1-3: LGTM!

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📝 Walkthrough

Summary by CodeRabbit

• Chores

  • Updated version control configuration to exclude Python cache directories

• Documentation

  • Added technical documentation outlining optimization strategies for decoding operations

• Performance & Reliability

  • Optimized decoding algorithms to improve overall processing performance
  • Enhanced error detection with better validation of malformed data

Walkthrough

The PR optimizes yEnc decoding in verify_nzb.py by replacing byte-by-byte Python iteration with a precomputed translation table and C-accelerated bytes.translate() operations, paired with performance documentation and Python cache exclusion in .gitignore.

Changes

yEnc Decoding Optimization

Layer / File(s)	Summary
yEnc decoding optimization with performance notes verify_nzb.py, .jules/bolt.md	_YENC_DECODE_TABLE enables bytes.translate() for bulk decoding of unescaped yEnc sections, while _decode_yenc_lines uses bytes.find() to locate and parse escape sequences. Incomplete escapes raise ValueError("dangling yEnc escape"). Documentation in .jules/bolt.md describes the technique of replacing slow Python iteration with C-accelerated operations.
Python cache cleanup .gitignore	Pattern __pycache__/ added to exclude Python bytecode cache directories from version control.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Swift yEnc now flies with C-bound wings,
No byte-by-byte crawl for performance things!
Translate and find make the decoder fast,
While caches hide, untracked and vast.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main optimization: using C-native bytes methods to speed up yEnc body decoding, which aligns with the core changes in verify_nzb.py.
Description check	✅ Passed	The description directly addresses the changeset by explaining the optimization strategy, motivation, and expected performance impact of the yEnc decoding improvements.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-yenc-decode-perf-15531706038645279370

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt-yenc-decode-perf-15531706038645279370

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