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import asyncio |
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from urllib.parse import urlparse |
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import aiohttp |
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from extraction import Extractor |
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from tqdm.asyncio import tqdm, tqdm_asyncio |
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def get_domain(url: str): |
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parsed = urlparse(url) |
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return parsed.netloc |
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async def gather_with_concurrency(n: int, tasks): |
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semaphore = asyncio.Semaphore(n) |
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async def sem_task(task): |
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async with semaphore: |
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return await task |
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results = asyncio.as_completed(tasks) |
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return results |
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async def scrape_description( |
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url: str, session: aiohttp.ClientSession, timeout: int = 15 |
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) -> str: |
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"""Scrape description of the given url from <head> and <meta> tags.""" |
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extractor = Extractor() |
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domain = get_domain(url) |
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try: |
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async with session.get(url, timeout=timeout) as response: |
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html = await response.text() |
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data = extractor.extract(html, source_url=url) |
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collected = [ |
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*data.titles, |
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data.description, |
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domain, |
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] |
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results = "\n".join(filter(bool, collected)) |
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return results |
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except: |
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return domain |
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async def crawl(urls: list[str], batch_size: int = 100): |
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connector = aiohttp.TCPConnector(limit=None, ttl_dns_cache=300) |
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async with aiohttp.ClientSession(connector=connector) as session: |
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gen_results = await gather_with_concurrency( |
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batch_size, [scrape_description(url, session) for url in urls] |
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) |
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for result in gen_results: |
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yield await result |
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async def run(urls: list[str], batch_size: int = 100): |
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crawler = crawl(urls, batch_size) |
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results = [c async for c in tqdm_asyncio(crawler, total=len(urls))] |
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return results |
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