76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
"""
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Cache management utilities for download plans.
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Handles caching, loading, and cleanup of download plan data.
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"""
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import json
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import hashlib
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from pathlib import Path
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from datetime import datetime, timedelta
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# Constants
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DEFAULT_CACHE_EXPIRATION_DAYS = 1
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DEFAULT_CACHE_FILENAME_LENGTH_LIMIT = 200 # Increased from 60
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DEFAULT_CACHE_FILENAME_PREFIX_LENGTH = 100 # Increased from 40
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def get_download_plan_cache_file(mode, **kwargs):
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"""Generate a unique cache filename based on mode and key parameters."""
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parts = [f"plan_{mode}"]
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# Handle parameters in a more readable way
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for k, v in sorted(kwargs.items()):
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if k == "channels_hash":
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# Use a shorter version of the hash for readability
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parts.append(f"hash{v[:8]}")
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else:
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parts.append(f"{k}{v}")
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base = "_".join(parts)
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# Hash for safety if string is still too long
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if len(base) > DEFAULT_CACHE_FILENAME_LENGTH_LIMIT:
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base = base[:DEFAULT_CACHE_FILENAME_PREFIX_LENGTH] + "_" + hashlib.md5(base.encode()).hexdigest()[:8]
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return Path(f"data/{base}.json")
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def load_cached_plan(cache_file, max_age_days=DEFAULT_CACHE_EXPIRATION_DAYS):
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"""Load a cached download plan if it exists and is not expired."""
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if not cache_file.exists():
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return None, None
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try:
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with open(cache_file, 'r', encoding='utf-8') as f:
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cache_data = json.load(f)
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cache_time = datetime.fromisoformat(cache_data.get('timestamp'))
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if datetime.now() - cache_time < timedelta(days=max_age_days):
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print(f"🗂️ Using cached download plan from {cache_time} ({cache_file.name}).")
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return cache_data['download_plan'], cache_data['unmatched']
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except Exception as e:
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print(f"⚠️ Could not load download plan cache: {e}")
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return None, None
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def save_plan_cache(cache_file, download_plan, unmatched):
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"""Save a download plan to cache."""
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if download_plan:
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cache_data = {
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'timestamp': datetime.now().isoformat(),
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'download_plan': download_plan,
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'unmatched': unmatched
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}
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with open(cache_file, 'w', encoding='utf-8') as f:
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json.dump(cache_data, f, indent=2, ensure_ascii=False)
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print(f"🗂️ Saved new download plan cache: {cache_file.name}")
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else:
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if cache_file.exists():
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cache_file.unlink()
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print(f"🗂️ No matches found, not saving download plan cache.")
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def delete_plan_cache(cache_file):
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"""Delete a download plan cache file."""
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if cache_file.exists():
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try:
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cache_file.unlink()
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print(f"🗑️ Deleted download plan cache: {cache_file.name}")
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except Exception as e:
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print(f"⚠️ Could not delete download plan cache: {e}") |