⚡ Bolt: Memoize validate_folder_url to skip redundant DNS lookups#113
⚡ Bolt: Memoize validate_folder_url to skip redundant DNS lookups#113
validate_folder_url to skip redundant DNS lookups#113Conversation
`validate_folder_url` performs a DNS lookup (`socket.getaddrinfo`) to check for private IPs. This function is called twice for every URL: once during cache warm-up and once during the main sync loop. This change adds `functools.lru_cache` to the function, eliminating the second DNS lookup. This saves approximately ~100ms per run (depending on DNS latency) and reduces network noise. - Uses `maxsize=128` to prevent memory leaks. - Verified with benchmark script (0.047s -> 0.000s for second call). - Existing tests pass.
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abhimehro
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abhimehro
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Good optimization! Adding @lru_cache to validate_folder_url will eliminate redundant DNS lookups.
Suggested Addition:
def sync_profile(...):
# SECURITY: Clear cached DNS validations for fresh checks each sync run
validate_folder_url.cache_clear()
# ... rest of functionSince this is a minor addition, I'll approve and make this change myself after merge.
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Pull request overview
This PR optimizes the validate_folder_url function by adding @lru_cache to memoize validation results and avoid redundant DNS lookups when the same URL is validated multiple times during script execution.
Changes:
- Added
lru_cacheimport from functools - Applied
@lru_cache(maxsize=128)decorator tovalidate_folder_url - Added docstring explaining the caching rationale
Comments suppressed due to low confidence (2)
main.py:367
- 'except' clause does nothing but pass and there is no explanatory comment.
except httpx.HTTPError:
main.py:382
- 'except' clause does nothing but pass and there is no explanatory comment.
except httpx.HTTPError:
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| @lru_cache(maxsize=128) | ||
| def validate_folder_url(url: str) -> bool: | ||
| """ | ||
| Validates a folder URL. | ||
| Cached to avoid repeated DNS lookups (socket.getaddrinfo) for the same URL | ||
| during warm-up and sync phases. | ||
| """ |
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Adding lru_cache to this function will suppress warning logs on subsequent calls with the same URL. The function logs warnings for various validation failures (unsafe URLs, localhost, private IPs, DNS resolution failures), but with caching enabled, these warnings will only appear the first time a URL is validated. Since this function is called in both warm_up_cache and sync_profile, warnings will only be logged during warm-up. This is a minor behavioral change that could make debugging slightly harder if someone is investigating why a URL is being skipped in the sync phase, but is likely acceptable given the performance benefits.
| @lru_cache(maxsize=128) | ||
| def validate_folder_url(url: str) -> bool: | ||
| """ | ||
| Validates a folder URL. | ||
| Cached to avoid repeated DNS lookups (socket.getaddrinfo) for the same URL | ||
| during warm-up and sync phases. | ||
| """ |
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The lru_cache decorator caches based on the full URL, but the expensive DNS lookup (line 228) only depends on the hostname. For a future optimization, consider caching hostname validation separately from URL validation. This would be particularly beneficial when multiple URLs share the same hostname (as is the case with the default configuration where all URLs use raw.githubusercontent.com), reducing DNS lookups from one per URL to one per unique hostname.
⚡ Bolt: Memoize
validate_folder_urlto skip redundant DNS lookups💡 What: Added
@lru_cachetovalidate_folder_urlinmain.py.🎯 Why: The function performs network IO (DNS lookup) and is called repeatedly for the same inputs in different phases of the script.
📊 Impact: Eliminates N redundant DNS lookups (where N is number of folder URLs). Saves ~100ms startup time.
🔬 Measurement: Confirmed via benchmark script that repeated calls become instant.
PR created automatically by Jules for task 18171659224812857307 started by @abhimehro