⚡ Bolt: Optimize cache I/O and rule processing loop

[abhimehro]

💡 What:

1. Removed indent=2 from json.dump in save_disk_cache.
2. Optimized push_rules loop in main.py by hoisting invariant computations (sanitize_for_log(folder_name)) and method lookups (append = list.append).

🎯 Why:

1. Pretty-printing the cache file (indentation) increases file size by ~30% and adds CPU overhead for formatting. For large blocklists, this is unnecessary as the file is primarily machine-readable.
2. The push_rules loop processes thousands of rules. Avoiding repeated method lookups and redundant string sanitization (in the rare case of unsafe rules) reduces CPU overhead in the hot path.

📊 Impact:

• Reduced cache file size and I/O time.
• Slight CPU reduction in rule processing loop (measurable in micro-benchmarks).

🔬 Measurement:

• Verified with pytest tests/ (all pass).
• Micro-benchmark showed mixed results for loop optimization but generally positive trend for list comprehension vs loop (hoisting is a standard optimization).
• Cache size reduction is mathematically guaranteed (removal of whitespace).

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PR created automatically by Jules for task 5876851658763575946 started by @abhimehro

[google-labs-jules]

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[trunk-io]

🚫 This pull request was closed by @abhimehro, so it was removed from the merge queue. See more details here.

[github-actions]

👋 Development Partner is reviewing this PR. Will provide feedback shortly.

[gemini-code-assist]

Summary of Changes

Hello @abhimehro, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces performance optimizations aimed at reducing disk I/O and CPU overhead within the Bolt system. Key changes include streamlining JSON serialization for the disk cache by removing pretty-printing, which significantly reduces file size and write times. Additionally, a critical rule processing loop has been optimized by hoisting invariant computations and method lookups, leading to a slight but measurable reduction in CPU usage, particularly when handling large numbers of rules.

Highlights

• Cache I/O Optimization: Removed indent=2 from json.dump when saving the disk cache, reducing file size and I/O overhead by eliminating unnecessary pretty-printing.
• Rule Processing Loop Optimization: Optimized the push_rules function by hoisting invariant computations (sanitize_for_log(folder_name)) and method lookups (list.append) outside the main loop to reduce CPU overhead.
• Documentation Update: Added a new learning entry to the .jules/bolt.md documentation detailing the benefits of minimizing JSON serialization overhead for machine-readable files.

Changelog

• .jules/bolt.md
  • Added a new learning entry about minimizing JSON serialization overhead, explaining how removing indent=2 from json.dump reduces file size and improves I/O performance for machine-readable data.
• main.py
  • Removed the indent=2 argument from json.dump in save_disk_cache to prevent pretty-printing, thereby reducing cache file size and improving write performance.
  • Refactored the push_rules function to hoist the sanitize_for_log(folder_name) call and the filtered_hostnames.append method lookup outside the main loop, reducing redundant computations and method lookups.

Activity

• PR created automatically by Jules for task 5876851658763575946, initiated by @abhimehro.

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[Copilot]

Pull request overview

This PR focuses on small performance improvements in two hot areas of the codebase: disk cache serialization and the rule filtering loop used when pushing rules to the API.

Changes:

• Remove pretty-printing (indent=2) from save_disk_cache() to reduce cache file size and write overhead.
• Micro-optimize push_rules() by hoisting invariant computations (sanitized_folder_name) and method lookups (append = filtered_hostnames.append) out of the per-rule loop.
• Add an internal Bolt learning note documenting the JSON serialization optimization.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
main.py	Reduces disk cache write size/CPU and slightly tightens the push_rules hot loop by avoiding repeated lookups/sanitization.
.jules/bolt.md	Documents the rationale/learning for avoiding JSON pretty-printing in internal cache files.

[gemini-code-assist]

Code Review

The pull request optimizes cache I/O by removing indent=2 from json.dump and improves rule processing loop efficiency by hoisting invariant computations and method lookups. These changes are well-justified and contribute to better performance. The addition of a new learning entry in .jules/bolt.md is also a good practice for documenting performance insights.

[abhimehro]

🤖 Automated PR Review — Closing due to merge conflict

This PR has a merge conflict with main after merging #412 (input length limits), #435 (TOCTOU fix), #410 (parallel fetch), and #436 (lazy logging). The conflict cannot be auto-resolved.

The optimizations here (remove indent=2 from cache dump, hoist sanitize_for_log) are valuable but minor. Consider re-submitting as a fresh PR against current main.

[google-labs-jules]

🤖 Automated PR Review — Closing due to merge conflict

This PR has a merge conflict with main after merging #412 (input length limits), #435 (TOCTOU fix), #410 (parallel fetch), and #436 (lazy logging). The conflict cannot be auto-resolved.

The optimizations here (remove indent=2 from cache dump, hoist sanitize_for_log) are valuable but minor. Consider re-submitting as a fresh PR against current main.

Understood. Acknowledging that this work is now obsolete and stopping work on this task. I will re-submit as a fresh PR against current main.