通过 tornado 异步检测目标网址文件是否存在。
代码实现
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import logging
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
from tornado import gen
from tornado.httpclient import AsyncHTTPClient, HTTPRequest
from tornado.options import define, options
define("port", default=10076, help="run on the given port", type=int)
class MainHandler(tornado.web.RequestHandler):
@gen.coroutine
def get(self):
_url = 'http://www.test.com/logo.jpg'
http_client = AsyncHTTPClient()
req = HTTPRequest(url=_url, method='HEAD')
http_client.fetch(req, callback=(yield gen.Callback("check_url_by_head")))
_response = yield gen.Wait("check_url_by_head")
logging.error(_response)
if _response.code == 200:
print 'file exist'
else:
print _response.code
def main():
tornado.options.parse_command_line()
application = tornado.web.Application([
(r"/", MainHandler),
])
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(options.port)
tornado.ioloop.IOLoop.instance().start()
if __name__ == "__main__":
main()
注意
需要目标文件服务器支持 HEAD 请求。
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