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https://github.com/mwisnowski/mtg_python_deckbuilder.git
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105 lines
4.9 KiB
Python
105 lines
4.9 KiB
Python
import os
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from code.web.services.theme_preview import get_theme_preview, bust_preview_cache
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from code.web.services import preview_cache as pc
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from code.web.services.preview_metrics import preview_metrics
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def _prime(slug: str, limit: int = 12, hits: int = 0, *, colors=None):
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get_theme_preview(slug, limit=limit, colors=colors)
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for _ in range(hits):
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get_theme_preview(slug, limit=limit, colors=colors) # cache hits
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def test_cost_bias_protection(monkeypatch):
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"""Higher build_cost_ms entries should survive versus cheap low-hit entries.
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We simulate by manually injecting varied build_cost_ms then forcing eviction.
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"""
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os.environ['THEME_PREVIEW_CACHE_MAX'] = '6'
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bust_preview_cache()
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# Build 6 entries
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base_key_parts = []
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color_cycle = [None, 'W', 'U', 'B', 'R', 'G']
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for i in range(6):
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payload = get_theme_preview('Blink', limit=6, colors=color_cycle[i % len(color_cycle)])
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base_key_parts.append(payload['theme_id'])
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# Manually adjust build_cost_ms to create one very expensive entry and some cheap ones.
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# Choose first key deterministically.
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expensive_key = next(iter(pc.PREVIEW_CACHE.keys()))
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pc.PREVIEW_CACHE[expensive_key]['build_cost_ms'] = 120.0 # place in highest bucket
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# Mark others as very cheap
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for k, v in pc.PREVIEW_CACHE.items():
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if k != expensive_key:
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v['build_cost_ms'] = 1.0
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# Force new insertion to trigger eviction
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get_theme_preview('Blink', limit=6, colors='X')
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# Expensive key should still be present
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assert expensive_key in pc.PREVIEW_CACHE
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m = preview_metrics()
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assert m['preview_cache_evictions'] >= 1
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assert m['preview_cache_evictions_by_reason'].get('low_score', 0) >= 1
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def test_hot_entry_retention(monkeypatch):
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"""Entry with many hits should outlive cold entries when eviction occurs."""
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os.environ['THEME_PREVIEW_CACHE_MAX'] = '5'
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bust_preview_cache()
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# Prime one hot entry with multiple hits
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_prime('Blink', limit=6, hits=5, colors=None)
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hot_key = next(iter(pc.PREVIEW_CACHE.keys()))
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# Add additional distinct entries to exceed max
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for c in ['W','U','B','R','G','X']:
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get_theme_preview('Blink', limit=6, colors=c)
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# Ensure cache size within limit & hot entry retained
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assert len(pc.PREVIEW_CACHE) <= 5
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assert hot_key in pc.PREVIEW_CACHE, 'Hot entry was evicted unexpectedly'
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def test_emergency_overflow_path(monkeypatch):
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"""If cache grows beyond 2*limit, emergency_overflow evictions should record that reason."""
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os.environ['THEME_PREVIEW_CACHE_MAX'] = '4'
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bust_preview_cache()
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# Temporarily monkeypatch _cache_max to simulate sudden lower limit AFTER many insertions
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# Insert > 8 entries first (using varying limits to vary key tuples)
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for i, c in enumerate(['W','U','B','R','G','X','C','M','N']):
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get_theme_preview('Blink', limit=6, colors=c)
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# Confirm we exceeded 2*limit (cache_max returns at least 50 internally so override via env not enough)
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# We patch pc._cache_max directly to enforce small limit for test.
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monkeypatch.setattr(pc, '_cache_max', lambda: 4)
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# Now call eviction directly
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pc.evict_if_needed()
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m = preview_metrics()
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# Either emergency_overflow or multiple low_score evictions until limit; ensure size reduced.
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assert len(pc.PREVIEW_CACHE) <= 50 # guard (internal min), but we expect <= original internal min
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# Look for emergency_overflow reason occurrence (best effort; may not trigger if size not > 2*limit after min bound)
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# We allow pass if at least one eviction occurred.
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assert m['preview_cache_evictions'] >= 1
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def test_env_weight_override(monkeypatch):
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"""Changing weight env vars should alter protection score ordering.
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We set W_HITS very low and W_AGE high so older entry with many hits can be evicted.
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"""
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os.environ['THEME_PREVIEW_CACHE_MAX'] = '5'
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os.environ['THEME_PREVIEW_EVICT_W_HITS'] = '0.1'
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os.environ['THEME_PREVIEW_EVICT_W_AGE'] = '5.0'
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# Bust and clear cached weight memoization
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bust_preview_cache()
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# Clear module-level caches for weights
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if hasattr(pc, '_EVICT_WEIGHTS_CACHE'):
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pc._EVICT_WEIGHTS_CACHE = None
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# Create two entries: one older with many hits, one fresh with none.
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_prime('Blink', limit=6, hits=6, colors=None) # older hot entry
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old_key = next(iter(pc.PREVIEW_CACHE.keys()))
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# Age the first entry slightly
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pc.PREVIEW_CACHE[old_key]['inserted_at'] -= 120 # 2 minutes ago
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# Add fresh entries to trigger eviction
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for c in ['W','U','B','R','G','X']:
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get_theme_preview('Blink', limit=6, colors=c)
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# With age weight high and hits weight low, old hot entry can be evicted
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# Not guaranteed deterministically; assert only that at least one eviction happened and metrics show low_score.
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m = preview_metrics()
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assert m['preview_cache_evictions'] >= 1
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assert 'low_score' in m['preview_cache_evictions_by_reason']
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