a03e68fa2f
Implement dynamic configuration selection based on URL patterns to optimize crawling for different content types. This feature enables users to apply different crawling strategies (PDF extraction, content filtering, JavaScript execution) based on URL matching patterns. Key additions: - Add url_matcher and match_mode parameters to CrawlerRunConfig - Implement is_match() method supporting string patterns, functions, and mixed lists - Add MatchMode enum for OR/AND logic when combining multiple matchers - Update AsyncWebCrawler.arun_many() to accept List[CrawlerRunConfig] - Add select_config() method to dispatchers for runtime config selection - First matching config wins, with fallback to default Pattern matching supports: - Glob-style strings: *.pdf, */blog/*, *api* - Lambda functions: lambda url: 'github.com' in url - Mixed patterns with AND/OR logic for complex matching This enables optimal per-URL configuration: - PDFs: Use PDFContentScrapingStrategy without JavaScript - Blogs: Apply content filtering to reduce noise - APIs: Skip JavaScript, use JSON extraction - Dynamic sites: Execute only necessary JavaScript Breaking changes: None - fully backward compatible
304 lines
11 KiB
Python
304 lines
11 KiB
Python
"""
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🎯 Multi-Config URL Matching Demo
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=================================
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Learn how to use different crawler configurations for different URL patterns
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in a single crawl batch with Crawl4AI's multi-config feature.
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Part 1: Understanding URL Matching (Pattern Testing)
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Part 2: Practical Example with Real Crawling
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"""
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import asyncio
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from crawl4ai import (
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AsyncWebCrawler,
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CrawlerRunConfig,
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MatchMode
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)
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from crawl4ai.processors.pdf import PDFContentScrapingStrategy
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from crawl4ai.extraction_strategy import JsonCssExtractionStrategy
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from crawl4ai.content_filter_strategy import PruningContentFilter
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from crawl4ai.markdown_generation_strategy import DefaultMarkdownGenerator
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def print_section(title):
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"""Print a formatted section header"""
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print(f"\n{'=' * 60}")
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print(f"{title}")
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print(f"{'=' * 60}\n")
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def test_url_matching(config, test_urls, config_name):
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"""Test URL matching for a config and show results"""
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print(f"Config: {config_name}")
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print(f"Matcher: {config.url_matcher}")
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if hasattr(config, 'match_mode'):
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print(f"Mode: {config.match_mode.value}")
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print("-" * 40)
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for url in test_urls:
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matches = config.is_match(url)
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symbol = "✓" if matches else "✗"
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print(f"{symbol} {url}")
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print()
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# ==============================================================================
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# PART 1: Understanding URL Matching
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# ==============================================================================
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def demo_part1_pattern_matching():
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"""Part 1: Learn how URL matching works without crawling"""
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print_section("PART 1: Understanding URL Matching")
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print("Let's explore different ways to match URLs with configs.\n")
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# Test URLs we'll use throughout
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test_urls = [
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"https://example.com/report.pdf",
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"https://example.com/data.json",
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"https://example.com/blog/post-1",
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"https://example.com/article/news",
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"https://api.example.com/v1/users",
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"https://example.com/about"
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]
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# 1.1 Simple String Pattern
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print("1.1 Simple String Pattern Matching")
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print("-" * 40)
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pdf_config = CrawlerRunConfig(
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url_matcher="*.pdf"
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)
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test_url_matching(pdf_config, test_urls, "PDF Config")
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# 1.2 Multiple String Patterns
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print("1.2 Multiple String Patterns (OR logic)")
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print("-" * 40)
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blog_config = CrawlerRunConfig(
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url_matcher=["*/blog/*", "*/article/*", "*/news/*"],
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match_mode=MatchMode.OR # This is default, shown for clarity
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)
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test_url_matching(blog_config, test_urls, "Blog/Article Config")
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# 1.3 Single Function Matcher
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print("1.3 Function-based Matching")
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print("-" * 40)
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api_config = CrawlerRunConfig(
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url_matcher=lambda url: 'api' in url or url.endswith('.json')
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)
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test_url_matching(api_config, test_urls, "API Config")
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# 1.4 List of Functions
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print("1.4 Multiple Functions with AND Logic")
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print("-" * 40)
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# Must be HTTPS AND contain 'api' AND have version number
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secure_api_config = CrawlerRunConfig(
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url_matcher=[
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lambda url: url.startswith('https://'),
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lambda url: 'api' in url,
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lambda url: '/v' in url # Version indicator
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],
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match_mode=MatchMode.AND
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)
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test_url_matching(secure_api_config, test_urls, "Secure API Config")
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# 1.5 Mixed: String and Function Together
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print("1.5 Mixed Patterns: String + Function")
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print("-" * 40)
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# Match JSON files OR any API endpoint
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json_or_api_config = CrawlerRunConfig(
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url_matcher=[
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"*.json", # String pattern
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lambda url: 'api' in url # Function
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],
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match_mode=MatchMode.OR
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)
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test_url_matching(json_or_api_config, test_urls, "JSON or API Config")
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# 1.6 Complex: Multiple Strings + Multiple Functions
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print("1.6 Complex Matcher: Mixed Types with AND Logic")
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print("-" * 40)
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# Must be: HTTPS AND (.com domain) AND (blog OR article) AND NOT a PDF
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complex_config = CrawlerRunConfig(
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url_matcher=[
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lambda url: url.startswith('https://'), # Function: HTTPS check
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"*.com/*", # String: .com domain
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lambda url: any(pattern in url for pattern in ['/blog/', '/article/']), # Function: Blog OR article
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lambda url: not url.endswith('.pdf') # Function: Not PDF
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],
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match_mode=MatchMode.AND
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)
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test_url_matching(complex_config, test_urls, "Complex Mixed Config")
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print("\n✅ Key Takeaway: First matching config wins when passed to arun_many()!")
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# ==============================================================================
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# PART 2: Practical Multi-URL Crawling
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# ==============================================================================
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async def demo_part2_practical_crawling():
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"""Part 2: Real-world example with different content types"""
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print_section("PART 2: Practical Multi-URL Crawling")
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print("Now let's see multi-config in action with real URLs.\n")
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# Create specialized configs for different content types
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configs = [
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# Config 1: PDF documents - only match files ending with .pdf
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CrawlerRunConfig(
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url_matcher="*.pdf",
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scraping_strategy=PDFContentScrapingStrategy()
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),
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# Config 2: Blog/article pages with content filtering
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CrawlerRunConfig(
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url_matcher=["*/blog/*", "*/article/*", "*python.org*"],
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markdown_generator=DefaultMarkdownGenerator(
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content_filter=PruningContentFilter(threshold=0.48)
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)
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),
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# Config 3: Dynamic pages requiring JavaScript
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CrawlerRunConfig(
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url_matcher=lambda url: 'github.com' in url,
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js_code="window.scrollTo(0, 500);" # Scroll to load content
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),
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# Config 4: Mixed matcher - API endpoints (string OR function)
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CrawlerRunConfig(
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url_matcher=[
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"*.json", # String pattern for JSON files
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lambda url: 'api' in url or 'httpbin.org' in url # Function for API endpoints
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],
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match_mode=MatchMode.OR,
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extraction_strategy=JsonCssExtractionStrategy({"data": "body"})
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),
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# Config 5: Complex matcher - Secure documentation sites
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CrawlerRunConfig(
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url_matcher=[
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lambda url: url.startswith('https://'), # Must be HTTPS
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"*.org/*", # String: .org domain
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lambda url: any(doc in url for doc in ['docs', 'documentation', 'reference']), # Has docs
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lambda url: not url.endswith(('.pdf', '.json')) # Not PDF or JSON
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],
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match_mode=MatchMode.AND,
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wait_for="css:.content, css:article" # Wait for content to load
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),
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# Default config for everything else
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CrawlerRunConfig() # No url_matcher means it never matches (except as fallback)
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]
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# URLs to crawl - each will use a different config
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urls = [
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"https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf", # → PDF config
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"https://blog.python.org/", # → Blog config with content filter
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"https://github.com/microsoft/playwright", # → JS config
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"https://httpbin.org/json", # → Mixed matcher config (API)
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"https://docs.python.org/3/reference/", # → Complex matcher config
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"https://example.com/", # → Default config
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]
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print("URLs to crawl:")
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for i, url in enumerate(urls, 1):
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print(f"{i}. {url}")
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print("\nCrawling with appropriate config for each URL...\n")
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async with AsyncWebCrawler() as crawler:
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results = await crawler.arun_many(
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urls=urls,
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config=configs
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)
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# Display results
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print("Results:")
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print("-" * 60)
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for result in results:
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if result.success:
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# Determine which config was used
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config_type = "Default"
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if result.url.endswith('.pdf'):
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config_type = "PDF Strategy"
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elif any(pattern in result.url for pattern in ['blog', 'python.org']) and 'docs' not in result.url:
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config_type = "Blog + Content Filter"
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elif 'github.com' in result.url:
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config_type = "JavaScript Enabled"
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elif 'httpbin.org' in result.url or result.url.endswith('.json'):
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config_type = "Mixed Matcher (API)"
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elif 'docs.python.org' in result.url:
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config_type = "Complex Matcher (Secure Docs)"
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print(f"\n✓ {result.url}")
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print(f" Config used: {config_type}")
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print(f" Content size: {len(result.markdown)} chars")
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# Show if we have fit_markdown (from content filter)
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if hasattr(result.markdown, 'fit_markdown') and result.markdown.fit_markdown:
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print(f" Fit markdown size: {len(result.markdown.fit_markdown)} chars")
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reduction = (1 - len(result.markdown.fit_markdown) / len(result.markdown)) * 100
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print(f" Content reduced by: {reduction:.1f}%")
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# Show extracted data if using extraction strategy
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if hasattr(result, 'extracted_content') and result.extracted_content:
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print(f" Extracted data: {str(result.extracted_content)[:100]}...")
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else:
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print(f"\n✗ {result.url}")
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print(f" Error: {result.error_message}")
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print("\n" + "=" * 60)
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print("✅ Multi-config crawling complete!")
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print("\nBenefits demonstrated:")
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print("- PDFs handled with specialized scraper")
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print("- Blog content filtered for relevance")
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print("- JavaScript executed only where needed")
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print("- Mixed matchers (string + function) for flexible matching")
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print("- Complex matchers for precise URL targeting")
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print("- Each URL got optimal configuration automatically!")
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async def main():
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"""Run both parts of the demo"""
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print("""
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🎯 Multi-Config URL Matching Demo
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=================================
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Learn how Crawl4AI can use different configurations
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for different URLs in a single batch.
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""")
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# Part 1: Pattern matching
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demo_part1_pattern_matching()
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print("\nPress Enter to continue to Part 2...")
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try:
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input()
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except EOFError:
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# Running in non-interactive mode, skip input
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pass
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# Part 2: Practical crawling
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await demo_part2_practical_crawling()
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if __name__ == "__main__":
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asyncio.run(main()) |