|
|
import asyncio
|
|
|
import re
|
|
|
import urllib.parse
|
|
|
from pysitemap.format_processors.xml import XMLWriter
|
|
|
from pysitemap.format_processors.text import TextWriter
|
|
|
import aiohttp
|
|
|
|
|
|
|
|
|
class Crawler:
|
|
|
|
|
|
format_processors = {
|
|
|
'xml': XMLWriter,
|
|
|
'txt': TextWriter
|
|
|
}
|
|
|
|
|
|
def __init__(self, rooturl, out_file, out_format='xml', maxtasks=100):
|
|
|
self.rooturl = rooturl
|
|
|
self.todo = set()
|
|
|
self.busy = set()
|
|
|
self.done = {}
|
|
|
self.tasks = set()
|
|
|
self.sem = asyncio.Semaphore(maxtasks)
|
|
|
|
|
|
# connector stores cookies between requests and uses connection pool
|
|
|
self.session = aiohttp.ClientSession()
|
|
|
self.writer = self.format_processors.get(out_format)(out_file)
|
|
|
|
|
|
async def run(self):
|
|
|
t = asyncio.ensure_future(self.addurls([(self.rooturl, '')]))
|
|
|
await asyncio.sleep(1)
|
|
|
while self.busy:
|
|
|
await asyncio.sleep(1)
|
|
|
|
|
|
await t
|
|
|
await self.session.close()
|
|
|
await self.writer.write([key for key, value in self.done.items() if value])
|
|
|
|
|
|
async def addurls(self, urls):
|
|
|
for url, parenturl in urls:
|
|
|
url = urllib.parse.urljoin(parenturl, url)
|
|
|
url, frag = urllib.parse.urldefrag(url)
|
|
|
if (url.startswith(self.rooturl) and
|
|
|
url not in self.busy and
|
|
|
url not in self.done and
|
|
|
url not in self.todo):
|
|
|
self.todo.add(url)
|
|
|
await self.sem.acquire()
|
|
|
task = asyncio.ensure_future(self.process(url))
|
|
|
task.add_done_callback(lambda t: self.sem.release())
|
|
|
task.add_done_callback(self.tasks.remove)
|
|
|
self.tasks.add(task)
|
|
|
|
|
|
async def process(self, url):
|
|
|
print('processing:', url)
|
|
|
|
|
|
self.todo.remove(url)
|
|
|
self.busy.add(url)
|
|
|
try:
|
|
|
resp = await self.session.get(url)
|
|
|
except Exception as exc:
|
|
|
print('...', url, 'has error', repr(str(exc)))
|
|
|
self.done[url] = False
|
|
|
else:
|
|
|
if (resp.status == 200 and
|
|
|
('text/html' in resp.headers.get('content-type'))):
|
|
|
data = (await resp.read()).decode('utf-8', 'replace')
|
|
|
urls = re.findall(r'(?i)href=["\']?([^\s"\'<>]+)', data)
|
|
|
asyncio.Task(self.addurls([(u, url) for u in urls]))
|
|
|
|
|
|
resp.close()
|
|
|
self.done[url] = True
|
|
|
|
|
|
self.busy.remove(url)
|
|
|
print(len(self.done), 'completed tasks,', len(self.tasks),
|
|
|
'still pending, todo', len(self.todo))
|
|
|
|
|
|
|