Some debugging for caching
This commit is contained in:
unclecode
449
tests/cache_validation/test_end_to_end.py
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449
tests/cache_validation/test_end_to_end.py
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@@ -0,0 +1,449 @@
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"""
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End-to-end tests for Smart Cache validation.
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Tests the full flow:
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1. Fresh crawl (browser launch) - SLOW
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2. Cached crawl without validation (check_cache_freshness=False) - FAST
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3. Cached crawl with validation (check_cache_freshness=True) - FAST (304/fingerprint)
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Verifies all layers:
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- Database storage of etag, last_modified, head_fingerprint, cached_at
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- Cache validation logic
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- HTTP conditional requests (304 Not Modified)
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- Performance improvements
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"""
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import pytest
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import time
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import asyncio
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from crawl4ai import AsyncWebCrawler, BrowserConfig, CrawlerRunConfig, CacheMode
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from crawl4ai.async_database import async_db_manager
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class TestEndToEndCacheValidation:
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"""End-to-end tests for the complete cache validation flow."""
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@pytest.mark.asyncio
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async def test_full_cache_flow_docs_python(self):
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"""
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Test complete cache flow with docs.python.org:
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1. Fresh crawl (slow - browser) - using BYPASS to force fresh
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2. Cache hit without validation (fast)
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3. Cache hit with validation (fast - 304)
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"""
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url = "https://docs.python.org/3/"
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browser_config = BrowserConfig(headless=True, verbose=False)
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# ========== CRAWL 1: Fresh crawl (force with WRITE_ONLY to skip cache read) ==========
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config1 = CrawlerRunConfig(
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cache_mode=CacheMode.WRITE_ONLY, # Skip reading, write new data
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check_cache_freshness=False,
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)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start1 = time.perf_counter()
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result1 = await crawler.arun(url, config=config1)
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time1 = time.perf_counter() - start1
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assert result1.success, f"First crawl failed: {result1.error_message}"
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# WRITE_ONLY means we did a fresh crawl and wrote to cache
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assert result1.cache_status == "miss", f"Expected 'miss', got '{result1.cache_status}'"
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print(f"\n[CRAWL 1] Fresh crawl: {time1:.2f}s (cache_status: {result1.cache_status})")
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# Verify data is stored in database
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metadata = await async_db_manager.aget_cache_metadata(url)
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assert metadata is not None, "Metadata should be stored in database"
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assert metadata.get("etag") or metadata.get("last_modified"), "Should have ETag or Last-Modified"
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print(f" - Stored ETag: {metadata.get('etag', 'N/A')[:30]}...")
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print(f" - Stored Last-Modified: {metadata.get('last_modified', 'N/A')}")
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print(f" - Stored head_fingerprint: {metadata.get('head_fingerprint', 'N/A')}")
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print(f" - Stored cached_at: {metadata.get('cached_at', 'N/A')}")
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# ========== CRAWL 2: Cache hit WITHOUT validation ==========
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config2 = CrawlerRunConfig(
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cache_mode=CacheMode.ENABLED,
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check_cache_freshness=False, # Skip validation - pure cache hit
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)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start2 = time.perf_counter()
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result2 = await crawler.arun(url, config=config2)
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time2 = time.perf_counter() - start2
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assert result2.success, f"Second crawl failed: {result2.error_message}"
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assert result2.cache_status == "hit", f"Expected 'hit', got '{result2.cache_status}'"
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print(f"\n[CRAWL 2] Cache hit (no validation): {time2:.2f}s (cache_status: {result2.cache_status})")
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print(f" - Speedup: {time1/time2:.1f}x faster than fresh crawl")
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# Should be MUCH faster - no browser, no HTTP request
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assert time2 < time1 / 2, f"Cache hit should be at least 2x faster (was {time1/time2:.1f}x)"
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# ========== CRAWL 3: Cache hit WITH validation (304) ==========
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config3 = CrawlerRunConfig(
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cache_mode=CacheMode.ENABLED,
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check_cache_freshness=True, # Validate cache freshness
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)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start3 = time.perf_counter()
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result3 = await crawler.arun(url, config=config3)
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time3 = time.perf_counter() - start3
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assert result3.success, f"Third crawl failed: {result3.error_message}"
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# Should be "hit_validated" (304) or "hit_fallback" (error during validation)
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assert result3.cache_status in ["hit_validated", "hit_fallback"], \
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f"Expected validated cache hit, got '{result3.cache_status}'"
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print(f"\n[CRAWL 3] Cache hit (with validation): {time3:.2f}s (cache_status: {result3.cache_status})")
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print(f" - Speedup: {time1/time3:.1f}x faster than fresh crawl")
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# Should still be fast - just a HEAD request, no browser
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assert time3 < time1 / 2, f"Validated cache hit should be faster than fresh crawl"
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# ========== SUMMARY ==========
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print(f"\n{'='*60}")
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print(f"PERFORMANCE SUMMARY for {url}")
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print(f"{'='*60}")
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print(f" Fresh crawl (browser): {time1:.2f}s")
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print(f" Cache hit (no validation): {time2:.2f}s ({time1/time2:.1f}x faster)")
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print(f" Cache hit (with validation): {time3:.2f}s ({time1/time3:.1f}x faster)")
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print(f"{'='*60}")
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@pytest.mark.asyncio
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async def test_full_cache_flow_crawl4ai_docs(self):
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"""Test with docs.crawl4ai.com."""
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url = "https://docs.crawl4ai.com/"
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browser_config = BrowserConfig(headless=True, verbose=False)
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# Fresh crawl - use WRITE_ONLY to ensure we get fresh data
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config1 = CrawlerRunConfig(cache_mode=CacheMode.WRITE_ONLY, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start1 = time.perf_counter()
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result1 = await crawler.arun(url, config=config1)
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time1 = time.perf_counter() - start1
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assert result1.success
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assert result1.cache_status == "miss"
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print(f"\n[docs.crawl4ai.com] Fresh: {time1:.2f}s")
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# Cache hit with validation
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config2 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=True)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start2 = time.perf_counter()
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result2 = await crawler.arun(url, config=config2)
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time2 = time.perf_counter() - start2
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assert result2.success
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assert result2.cache_status in ["hit_validated", "hit_fallback"]
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print(f"[docs.crawl4ai.com] Validated: {time2:.2f}s ({time1/time2:.1f}x faster)")
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@pytest.mark.asyncio
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async def test_verify_database_storage(self):
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"""Verify all validation metadata is properly stored in database."""
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url = "https://docs.python.org/3/library/asyncio.html"
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browser_config = BrowserConfig(headless=True, verbose=False)
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config = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result = await crawler.arun(url, config=config)
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assert result.success
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# Verify all fields in database
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metadata = await async_db_manager.aget_cache_metadata(url)
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assert metadata is not None, "Metadata must be stored"
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assert "url" in metadata
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assert "etag" in metadata
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assert "last_modified" in metadata
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assert "head_fingerprint" in metadata
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assert "cached_at" in metadata
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assert "response_headers" in metadata
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print(f"\nDatabase storage verification for {url}:")
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print(f" - etag: {metadata['etag'][:40] if metadata['etag'] else 'None'}...")
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print(f" - last_modified: {metadata['last_modified']}")
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print(f" - head_fingerprint: {metadata['head_fingerprint']}")
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print(f" - cached_at: {metadata['cached_at']}")
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print(f" - response_headers keys: {list(metadata['response_headers'].keys())[:5]}...")
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# At least one validation field should be populated
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has_validation_data = (
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metadata["etag"] or
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metadata["last_modified"] or
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metadata["head_fingerprint"]
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)
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assert has_validation_data, "Should have at least one validation field"
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@pytest.mark.asyncio
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async def test_head_fingerprint_stored_and_used(self):
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"""Verify head fingerprint is computed, stored, and used for validation."""
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url = "https://example.com/"
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browser_config = BrowserConfig(headless=True, verbose=False)
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# Fresh crawl
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config1 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result1 = await crawler.arun(url, config=config1)
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assert result1.success
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assert result1.head_fingerprint, "head_fingerprint should be set on CrawlResult"
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# Verify in database
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metadata = await async_db_manager.aget_cache_metadata(url)
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assert metadata["head_fingerprint"], "head_fingerprint should be stored in database"
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assert metadata["head_fingerprint"] == result1.head_fingerprint
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print(f"\nHead fingerprint for {url}:")
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print(f" - CrawlResult.head_fingerprint: {result1.head_fingerprint}")
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print(f" - Database head_fingerprint: {metadata['head_fingerprint']}")
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# Validate using fingerprint
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config2 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=True)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result2 = await crawler.arun(url, config=config2)
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assert result2.success
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assert result2.cache_status in ["hit_validated", "hit_fallback"]
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print(f" - Validation result: {result2.cache_status}")
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class TestCacheValidationPerformance:
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"""Performance benchmarks for cache validation."""
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@pytest.mark.asyncio
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async def test_multiple_urls_performance(self):
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"""Test cache performance across multiple URLs."""
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urls = [
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"https://docs.python.org/3/",
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"https://docs.python.org/3/library/asyncio.html",
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"https://en.wikipedia.org/wiki/Python_(programming_language)",
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]
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browser_config = BrowserConfig(headless=True, verbose=False)
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fresh_times = []
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cached_times = []
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print(f"\n{'='*70}")
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print("MULTI-URL PERFORMANCE TEST")
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print(f"{'='*70}")
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# Fresh crawls - use WRITE_ONLY to force fresh crawl
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for url in urls:
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config = CrawlerRunConfig(cache_mode=CacheMode.WRITE_ONLY, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start = time.perf_counter()
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result = await crawler.arun(url, config=config)
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elapsed = time.perf_counter() - start
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fresh_times.append(elapsed)
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print(f"Fresh: {url[:50]:50} {elapsed:.2f}s ({result.cache_status})")
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# Cached crawls with validation
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for url in urls:
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config = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=True)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start = time.perf_counter()
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result = await crawler.arun(url, config=config)
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elapsed = time.perf_counter() - start
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cached_times.append(elapsed)
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print(f"Cached: {url[:50]:50} {elapsed:.2f}s ({result.cache_status})")
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avg_fresh = sum(fresh_times) / len(fresh_times)
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avg_cached = sum(cached_times) / len(cached_times)
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total_fresh = sum(fresh_times)
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total_cached = sum(cached_times)
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print(f"\n{'='*70}")
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print(f"RESULTS:")
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print(f" Total fresh crawl time: {total_fresh:.2f}s")
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print(f" Total cached time: {total_cached:.2f}s")
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print(f" Average speedup: {avg_fresh/avg_cached:.1f}x")
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print(f" Time saved: {total_fresh - total_cached:.2f}s")
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print(f"{'='*70}")
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# Cached should be significantly faster
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assert avg_cached < avg_fresh / 2, "Cached crawls should be at least 2x faster"
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@pytest.mark.asyncio
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async def test_repeated_access_same_url(self):
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"""Test repeated access to the same URL shows consistent cache hits."""
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url = "https://docs.python.org/3/"
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num_accesses = 5
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browser_config = BrowserConfig(headless=True, verbose=False)
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print(f"\n{'='*60}")
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print(f"REPEATED ACCESS TEST: {url}")
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print(f"{'='*60}")
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# First access - fresh crawl
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config = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start = time.perf_counter()
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result = await crawler.arun(url, config=config)
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fresh_time = time.perf_counter() - start
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print(f"Access 1 (fresh): {fresh_time:.2f}s - {result.cache_status}")
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# Repeated accesses - should all be cache hits
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cached_times = []
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for i in range(2, num_accesses + 1):
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config = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=True)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start = time.perf_counter()
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result = await crawler.arun(url, config=config)
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elapsed = time.perf_counter() - start
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cached_times.append(elapsed)
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print(f"Access {i} (cached): {elapsed:.2f}s - {result.cache_status}")
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assert result.cache_status in ["hit", "hit_validated", "hit_fallback"]
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avg_cached = sum(cached_times) / len(cached_times)
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print(f"\nAverage cached time: {avg_cached:.2f}s")
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print(f"Speedup over fresh: {fresh_time/avg_cached:.1f}x")
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class TestCacheValidationModes:
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"""Test different cache modes and their behavior."""
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@pytest.mark.asyncio
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async def test_cache_bypass_always_fresh(self):
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"""CacheMode.BYPASS should always do fresh crawl."""
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# Use a unique URL path to avoid cache from other tests
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url = "https://example.com/test-bypass"
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browser_config = BrowserConfig(headless=True, verbose=False)
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# First crawl with WRITE_ONLY to populate cache (always fresh)
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config1 = CrawlerRunConfig(cache_mode=CacheMode.WRITE_ONLY, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result1 = await crawler.arun(url, config=config1)
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assert result1.cache_status == "miss"
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# Second crawl with BYPASS - should NOT use cache
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config2 = CrawlerRunConfig(cache_mode=CacheMode.BYPASS, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result2 = await crawler.arun(url, config=config2)
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# BYPASS mode means no cache interaction
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assert result2.cache_status is None or result2.cache_status == "miss"
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print(f"\nCacheMode.BYPASS result: {result2.cache_status}")
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@pytest.mark.asyncio
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async def test_validation_disabled_uses_cache_directly(self):
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"""With check_cache_freshness=False, should use cache without HTTP validation."""
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url = "https://docs.python.org/3/tutorial/"
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browser_config = BrowserConfig(headless=True, verbose=False)
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# Fresh crawl - use WRITE_ONLY to force fresh
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config1 = CrawlerRunConfig(cache_mode=CacheMode.WRITE_ONLY, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result1 = await crawler.arun(url, config=config1)
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assert result1.cache_status == "miss"
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# Cached with validation DISABLED - should be "hit" (not "hit_validated")
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config2 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start = time.perf_counter()
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result2 = await crawler.arun(url, config=config2)
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elapsed = time.perf_counter() - start
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assert result2.cache_status == "hit", f"Expected 'hit', got '{result2.cache_status}'"
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print(f"\nValidation disabled: {elapsed:.3f}s (cache_status: {result2.cache_status})")
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# Should be very fast - no HTTP request at all
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assert elapsed < 1.0, "Cache hit without validation should be < 1 second"
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@pytest.mark.asyncio
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async def test_validation_enabled_checks_freshness(self):
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"""With check_cache_freshness=True, should validate before using cache."""
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url = "https://docs.python.org/3/reference/"
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browser_config = BrowserConfig(headless=True, verbose=False)
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# Fresh crawl
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config1 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result1 = await crawler.arun(url, config=config1)
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# Cached with validation ENABLED - should be "hit_validated"
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config2 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=True)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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start = time.perf_counter()
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result2 = await crawler.arun(url, config=config2)
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elapsed = time.perf_counter() - start
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assert result2.cache_status in ["hit_validated", "hit_fallback"]
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print(f"\nValidation enabled: {elapsed:.3f}s (cache_status: {result2.cache_status})")
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class TestCacheValidationResponseHeaders:
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"""Test that response headers are properly stored and retrieved."""
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@pytest.mark.asyncio
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async def test_response_headers_stored(self):
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"""Verify response headers including ETag and Last-Modified are stored."""
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url = "https://docs.python.org/3/"
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browser_config = BrowserConfig(headless=True, verbose=False)
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config = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
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async with AsyncWebCrawler(config=browser_config) as crawler:
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result = await crawler.arun(url, config=config)
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assert result.success
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assert result.response_headers is not None
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|
||||
# Check that cache-relevant headers are captured
|
||||
headers = result.response_headers
|
||||
print(f"\nResponse headers for {url}:")
|
||||
|
||||
# Look for ETag (case-insensitive)
|
||||
etag = headers.get("etag") or headers.get("ETag")
|
||||
print(f" - ETag: {etag}")
|
||||
|
||||
# Look for Last-Modified
|
||||
last_modified = headers.get("last-modified") or headers.get("Last-Modified")
|
||||
print(f" - Last-Modified: {last_modified}")
|
||||
|
||||
# Look for Cache-Control
|
||||
cache_control = headers.get("cache-control") or headers.get("Cache-Control")
|
||||
print(f" - Cache-Control: {cache_control}")
|
||||
|
||||
# At least one should be present for docs.python.org
|
||||
assert etag or last_modified, "Should have ETag or Last-Modified header"
|
||||
|
||||
@pytest.mark.asyncio
|
||||
async def test_headers_used_for_validation(self):
|
||||
"""Verify stored headers are used for conditional requests."""
|
||||
url = "https://docs.crawl4ai.com/"
|
||||
|
||||
browser_config = BrowserConfig(headless=True, verbose=False)
|
||||
|
||||
# Fresh crawl to store headers
|
||||
config1 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=False)
|
||||
async with AsyncWebCrawler(config=browser_config) as crawler:
|
||||
result1 = await crawler.arun(url, config=config1)
|
||||
|
||||
# Get stored metadata
|
||||
metadata = await async_db_manager.aget_cache_metadata(url)
|
||||
stored_etag = metadata.get("etag")
|
||||
stored_last_modified = metadata.get("last_modified")
|
||||
|
||||
print(f"\nStored validation data for {url}:")
|
||||
print(f" - etag: {stored_etag}")
|
||||
print(f" - last_modified: {stored_last_modified}")
|
||||
|
||||
# Validate - should use stored headers
|
||||
config2 = CrawlerRunConfig(cache_mode=CacheMode.ENABLED, check_cache_freshness=True)
|
||||
async with AsyncWebCrawler(config=browser_config) as crawler:
|
||||
result2 = await crawler.arun(url, config=config2)
|
||||
|
||||
# Should get validated hit (304 response)
|
||||
assert result2.cache_status in ["hit_validated", "hit_fallback"]
|
||||
print(f" - Validation result: {result2.cache_status}")
|
||||
Reference in New Issue
Block a user