我想很快连接到很多不同网站的列表。 我使用asyncio以异步方式执行此操作,现在希望 如果连接需要太长时间才能响应,请添加应忽略连接的超时时间。
我该如何实现?
import ssl
import asyncio
from contextlib import suppress
from concurrent.futures import ThreadPoolExecutor
import time
@asyncio.coroutine
def run():
while True:
host = yield from q.get()
if not host:
break
with suppress(ssl.CertificateError):
reader, writer = yield from asyncio.open_connection(host[1], 443, ssl=True) #timout option?
reader.close()
writer.close()
@asyncio.coroutine
def load_q():
# only 3 entries for debugging reasons
for host in [[1, 'python.org'], [2, 'qq.com'], [3, 'google.com']]:
yield from q.put(host)
for _ in range(NUM):
q.put(None)
if __name__ == "__main__":
NUM = 1000
q = asyncio.Queue()
loop = asyncio.get_event_loop()
loop.set_default_executor(ThreadPoolExecutor(NUM))
start = time.time()
coros = [asyncio.async(run()) for i in range(NUM)]
loop.run_until_complete(load_q())
loop.run_until_complete(asyncio.wait(coros))
end = time.time()
print(end-start)
(旁注:有人知道如何优化它吗?)
您可以将对} 中,这允许您指定超时:
open_connection
的调用包装在^{请注意,当引发} 。
TimeoutError
时,也会取消open_connection
协程。如果您不想取消它(尽管我认为您希望在本例中取消它),您已经将调用包装成^{相关问题 更多 >
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