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