def __init__(self, stats, ignore_url=ignore_url):
self.stats = stats
if ignore_url is None:
ignore_url = lambda url: False
self.ignore_url = ignore_url
self.urls = set()
self.buckets = defaultdict(set)
self.hosts = SortedKeyValue(key=itemgetter(1), value=itemgetter(0))
def test_remove():
s = SortedKeyValue(itemgetter(1), itemgetter(0))
s.insert((0, 'en.wikipedia.org'))
s.remove((0, 'en.wikipedia.org'))
assert len(s) == 0
assert len(s.keys) == 0
assert len(s.values) == 0
s.insert((20, 'en.wikipedia.org'))
s.remove(('whatever', 'en.wikipedia.org'))
assert len(s) == 0
assert len(s.keys) == 0
assert len(s.values) == 0
def test_insert():
s = SortedKeyValue(itemgetter(1), itemgetter(0))
s.insert((0, 'en.wikipedia.org'))
assert s.find_le(10)[1] == 'en.wikipedia.org'
s.insert((10, 'en.wikipedia.org'))
s.insert((20, 'en.wikipedia.org'))
assert s.find_le(20)[1] == 'en.wikipedia.org'
assert len(s) == 1
assert len(s.keys) == 1
assert len(s.values) == 1
class URLFrontier(object):
def __init__(self, stats, ignore_url=ignore_url):
self.stats = stats
if ignore_url is None:
ignore_url = lambda url: False
self.ignore_url = ignore_url
self.urls = set()
self.buckets = defaultdict(set)
self.hosts = SortedKeyValue(key=itemgetter(1), value=itemgetter(0))
def get_waittime(self, domain):
return int(time.time()) + 10
def add(self, origin, urls=None):
hostname = urlparse(origin).hostname
waittime = self.get_waittime(hostname)
if not urls:
urls = set([origin])
if not isinstance(urls, set):
urls = set([urls])
new_urls = urls - self.urls
if not self.ignore_url(origin):
self.hosts.insert((waittime, hostname))
for url in new_urls:
hostname = urlparse(url).hostname or ''
if self.ignore_url(url):
continue
self.buckets[hostname].add(url)
if hostname not in self.hosts:
self.hosts.insert((0, hostname))
# log.debug('Found {} new urls'.format(len(new_urls)))
self.urls.update(new_urls)
self.stats['URLs frontier'] = len(self.urls)
self.stats['hostnames'] = len(self.hosts)
return waittime
def pop(self):
url = None
while url is None:
try:
val, hostname = self.hosts.find_le(time.time())
except ValueError:
return
waittime = self.get_waittime(hostname)
self.hosts.insert((waittime, hostname))
try:
url = self.buckets[hostname].pop()
except KeyError:
del self.buckets[hostname]
self.hosts.remove((0, hostname))
return url
