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AsyncBaseCrawler.py
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AsyncBaseCrawler.py
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import asyncio
import aiohttp
#import objgraph
import sys
import re
import logging
from multiprocessing import Process, Manager
from AsyncCrawlerUtils import ParserType, QueuingTask, CrawlerMetaClass
try:
from asyncio import JoinableQueue as Queue
except ImportError:
from asyncio import Queue
LOGGER = logging.getLogger(__name__)
item_cnt = 0
class BaseAsyncCrawler(metaclass=CrawlerMetaClass):
def __init__(self, task):
self.seen_url = set()
self.max_tasks = 50
self.max_retry = 10
self.loop = asyncio.get_event_loop()
self.session = aiohttp.ClientSession(loop=self.loop)
self.q = Queue(loop = self.loop)
self.manager = Manager()
self.q.put_nowait(task)
"""
for debug
"""
self.item_cnt = 0
self.page_cnt = 0
self.f = open("D:\\Acer", 'w')
print('initialization finished.')
def close(self):
self.session.close()
self.f.close()
async def crawl(self):
workers = [asyncio.Task(self.work(), loop=self.loop) for _ in range(self.max_tasks)]
try:
await self.q.join()
for worker in workers:
worker.cancel()
except Exception as e:
LOGGER.error('[in crawl] unexpected error with message: ', e)
raise e
async def fetch(self, queuingTask):
#print('fetching')
"""
unpack task tuple
"""
url, page_type, info_item = queuingTask
#print(url)
"""
try to establish connection
"""
tries = 0
while tries < self.max_retry:
try:
response = await self.session.get(url, headers = self.REQUEST_HEADERS)
break
except aiohttp.ClientError:
pass
except Exception as e:
print(e)
tries += 1
else:
LOGGER.warning("fail to connect to "+url)
return
#print('connection established.')
try:
text = await response.text()
except Exception as e:
print('when get page content: ', e)
print("fail to get page content from " + url)
else:
"""
parse response
"""
try:
todo = self.manager.list()
done = self.manager.list()
#print(self.__dict__)
#print(hasattr(self, '__mapping__'))
if hasattr(self, '__mapping__'):
parser = self.__mapping__[page_type]
#print('parsing '+page_type)
if parser.parser_type == ParserType.GENERATOR:
p = Process(target=parser, args=(todo, done, self, text,))
elif parser.parser_type == ParserType.APPENDER:
p = Process(target=parser, args=(todo, done, self, text, info_item,))
else:
raise Exception('fatal: unrecognized parser type')
p.start()
p.join()
for task in todo:
self.q.put_nowait(task)
for data_item in done:
self.item_cnt += 1
self.f.write(str(self.item_cnt) + "#" + str(data_item) + "\n")
self.f.flush()
print("NO." + str(self.item_cnt) + " item")
else:
raise Exception('fatal: uninitialized crawler.')
except Exception as e:
print(e)
finally:
await response.release()
async def work(self):
try:
while True:
queuingTask = await self.q.get()
await self.fetch(queuingTask)
self.q.task_done()
except asyncio.CancelledError:
pass