108 lines
2.7 KiB
Python
108 lines
2.7 KiB
Python
#!/usr/bin/env python
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import time
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from datetime import timedelta
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try:
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from HTMLParser import HTMLParser
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from urlparse import urljoin, urldefrag
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except ImportError:
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from html.parser import HTMLParser
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from urllib.parse import urljoin, urldefrag
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from tornado import httpclient, gen, ioloop, queues
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base_url = 'http://www.tornadoweb.org/en/stable/'
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concurrency = 10
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@gen.coroutine
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def get_links_from_url(url):
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"""Download the page at `url` and parse it for links.
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Returned links have had the fragment after `#` removed, and have been made
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absolute so, e.g. the URL 'gen.html#tornado.gen.coroutine' becomes
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'http://www.tornadoweb.org/en/stable/gen.html'.
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"""
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try:
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response = yield httpclient.AsyncHTTPClient().fetch(url)
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print('fetched %s' % url)
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html = response.body if isinstance(response.body, str) \
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else response.body.decode(errors='ignore')
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urls = [urljoin(url, remove_fragment(new_url))
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for new_url in get_links(html)]
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except Exception as e:
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print('Exception: %s %s' % (e, url))
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raise gen.Return([])
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raise gen.Return(urls)
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def remove_fragment(url):
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pure_url, frag = urldefrag(url)
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return pure_url
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def get_links(html):
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class URLSeeker(HTMLParser):
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def __init__(self):
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HTMLParser.__init__(self)
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self.urls = []
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def handle_starttag(self, tag, attrs):
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href = dict(attrs).get('href')
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if href and tag == 'a':
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self.urls.append(href)
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url_seeker = URLSeeker()
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url_seeker.feed(html)
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return url_seeker.urls
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@gen.coroutine
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def main():
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q = queues.Queue()
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start = time.time()
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fetching, fetched = set(), set()
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@gen.coroutine
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def fetch_url():
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current_url = yield q.get()
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try:
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if current_url in fetching:
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return
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print('fetching %s' % current_url)
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fetching.add(current_url)
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urls = yield get_links_from_url(current_url)
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fetched.add(current_url)
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for new_url in urls:
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# Only follow links beneath the base URL
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if new_url.startswith(base_url):
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yield q.put(new_url)
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finally:
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q.task_done()
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@gen.coroutine
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def worker():
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while True:
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yield fetch_url()
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q.put(base_url)
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# Start workers, then wait for the work queue to be empty.
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for _ in range(concurrency):
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worker()
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yield q.join(timeout=timedelta(seconds=300))
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assert fetching == fetched
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print('Done in %d seconds, fetched %s URLs.' % (
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time.time() - start, len(fetched)))
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if __name__ == '__main__':
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io_loop = ioloop.IOLoop.current()
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io_loop.run_sync(main)
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