68 lines
2.4 KiB
Python
68 lines
2.4 KiB
Python
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import asyncio, time
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from crawl4ai.async_webcrawler import AsyncWebCrawler
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from crawl4ai.async_configs import BrowserConfig, CrawlerRunConfig, RateLimitConfig
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from crawl4ai.dispatcher import DisplayMode
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async def crawl_with_rate_limiting(urls):
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"""
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Example function demonstrating how to use AsyncWebCrawler with rate limiting and resource monitoring.
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Args:
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urls (List[str]): List of URLs to crawl
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Returns:
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List[CrawlResult]: List of crawl results for each URL
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"""
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# Configure browser settings
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browser_config = BrowserConfig(
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headless=True, # Run browser in headless mode
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verbose=False # Minimize browser logging
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)
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# Configure crawler settings with rate limiting
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run_config = CrawlerRunConfig(
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# Enable rate limiting
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enable_rate_limiting=True,
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rate_limit_config=RateLimitConfig(
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base_delay=(1.0, 2.0), # Random delay between 1-2 seconds between requests
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max_delay=30.0, # Maximum delay after rate limit hits
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max_retries=2, # Number of retries before giving up
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rate_limit_codes=[429, 503] # HTTP status codes to trigger rate limiting
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),
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# Resource monitoring settings
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memory_threshold_percent=70.0, # Pause crawling if memory usage exceeds this
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check_interval=0.5, # How often to check resource usage
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max_session_permit=10, # Maximum concurrent crawls
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display_mode=DisplayMode.DETAILED.value # Show detailed progress
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)
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# Create and use crawler with context manager
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async with AsyncWebCrawler(config=browser_config) as crawler:
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results = await crawler.arun_many(urls, config=run_config)
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return results
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def main():
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# Example URLs (replace with real URLs)
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urls = [
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f"https://example.com/page{i}" for i in range(1, 40)
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]
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start = time.perf_counter()
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# Run the crawler
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results = asyncio.run(crawl_with_rate_limiting(urls))
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# Process results
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successful_results = [result for result in results if result.success]
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failed_results = [result for result in results if not result.success]
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end = time.perf_counter()
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# Print results
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print(f"Successful crawls: {len(successful_results)}")
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print(f"Failed crawls: {len(failed_results)}")
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print(f"Time taken: {end - start:.2f} seconds")
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if __name__ == "__main__":
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main()
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