195 lines
6.7 KiB
Python
195 lines
6.7 KiB
Python
import asyncio
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import os
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from pathlib import Path
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import aiohttp
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import json
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from crawl4ai import AsyncWebCrawler
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from crawl4ai.content_filter_strategy import BM25ContentFilter
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# 1. File Download Processing Example
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async def download_example():
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"""Example of downloading files from Python.org"""
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# downloads_path = os.path.join(os.getcwd(), "downloads")
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downloads_path = os.path.join(Path.home(), ".crawl4ai", "downloads")
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os.makedirs(downloads_path, exist_ok=True)
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print(f"Downloads will be saved to: {downloads_path}")
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async with AsyncWebCrawler(
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accept_downloads=True,
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downloads_path=downloads_path,
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verbose=True
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) as crawler:
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result = await crawler.arun(
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url="https://www.python.org/downloads/",
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js_code="""
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// Find and click the first Windows installer link
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const downloadLink = document.querySelector('a[href$=".exe"]');
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if (downloadLink) {
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console.log('Found download link:', downloadLink.href);
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downloadLink.click();
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} else {
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console.log('No .exe download link found');
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}
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""",
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wait_for=5 # Wait 5 seconds to ensure download starts
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)
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if result.downloaded_files:
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print("\nDownload successful!")
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print("Downloaded files:")
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for file_path in result.downloaded_files:
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print(f"- {file_path}")
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print(f" File size: {os.path.getsize(file_path) / (1024*1024):.2f} MB")
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else:
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print("\nNo files were downloaded")
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# 2. Content Filtering with BM25 Example
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async def content_filtering_example():
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"""Example of using the new BM25 content filtering"""
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async with AsyncWebCrawler(verbose=True) as crawler:
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# Create filter with custom query for OpenAI's blog
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content_filter = BM25ContentFilter(
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user_query="AI language models research innovation",
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bm25_threshold=1.0
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)
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result = await crawler.arun(
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url="https://openai.com/blog",
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extraction_strategy=content_filter
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)
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print(f"Filtered content: {result.extracted_content}")
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# 3. Local File and Raw HTML Processing Example
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async def local_and_raw_html_example():
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"""Example of processing local files and raw HTML"""
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# Create a sample HTML file
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sample_file = "sample.html"
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with open(sample_file, "w") as f:
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f.write("""
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<html><body>
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<h1>Test Content</h1>
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<p>This is a test paragraph.</p>
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</body></html>
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""")
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async with AsyncWebCrawler(verbose=True) as crawler:
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# Process local file
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local_result = await crawler.arun(
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url=f"file://{os.path.abspath(sample_file)}"
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)
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# Process raw HTML
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raw_html = """
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<html><body>
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<h1>Raw HTML Test</h1>
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<p>This is a test of raw HTML processing.</p>
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</body></html>
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"""
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raw_result = await crawler.arun(
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url=f"raw:{raw_html}"
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)
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# Clean up
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os.remove(sample_file)
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print("Local file content:", local_result.markdown)
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print("\nRaw HTML content:", raw_result.markdown)
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# 4. Browser Management Example
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async def browser_management_example():
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"""Example of using enhanced browser management features"""
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# Use the specified user directory path
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user_data_dir = os.path.join(Path.home(), ".crawl4ai", "browser_profile")
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os.makedirs(user_data_dir, exist_ok=True)
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print(f"Browser profile will be saved to: {user_data_dir}")
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async with AsyncWebCrawler(
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use_managed_browser=True,
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user_data_dir=user_data_dir,
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headless=False,
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verbose=True
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) as crawler:
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# Use GitHub as an example - it's a good test for browser management
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# because it requires proper browser handling
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result = await crawler.arun(
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url="https://github.com/trending",
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session_id="persistent_session_1",
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js_code="""
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// Custom JavaScript to execute on GitHub's trending page
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const repos = document.querySelectorAll('article.Box-row');
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const data = Array.from(repos).map(repo => ({
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name: repo.querySelector('h2')?.textContent?.trim(),
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description: repo.querySelector('p')?.textContent?.trim(),
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language: repo.querySelector('[itemprop="programmingLanguage"]')?.textContent?.trim()
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}));
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console.log('Trending repositories:', JSON.stringify(data, null, 2));
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"""
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)
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print("\nBrowser session result:", result.success)
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if result.success:
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print("Page title:", result.metadata.get('title', 'No title found'))
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# 5. API Usage Example
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async def api_example():
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"""Example of using the new API endpoints"""
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async with aiohttp.ClientSession() as session:
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# Submit crawl job
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crawl_request = {
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"urls": ["https://news.ycombinator.com"], # Hacker News as an example
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"extraction_config": {
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"type": "json_css",
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"params": {
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"selectors": {
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"titles": ".title a",
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"scores": ".score",
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"comments": ".comment-tree"
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}
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}
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},
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"crawler_params": {
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"headless": True,
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"use_managed_browser": True
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},
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"screenshot": True,
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"magic": True
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}
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async with session.post(
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"http://localhost:11235/crawl",
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json=crawl_request
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) as response:
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task_data = await response.json()
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task_id = task_data["task_id"]
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# Check task status
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async with session.get(
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f"http://localhost:11235/task/{task_id}"
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) as status_response:
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result = await status_response.json()
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print(f"Task result: {result}")
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# Main execution
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async def main():
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print("Running Crawl4AI feature examples...")
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print("\n1. Running Download Example:")
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await download_example()
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print("\n2. Running Content Filtering Example:")
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await content_filtering_example()
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print("\n3. Running Local and Raw HTML Example:")
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await local_and_raw_html_example()
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print("\n4. Running Browser Management Example:")
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await browser_management_example()
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print("\n5. Running API Example:")
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await api_example()
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if __name__ == "__main__":
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asyncio.run(main()) |