基于Twisted的通过HTTP协议下载文件

最新推荐文章于 2024-05-10 09:42:08 发布

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最新推荐文章于 2024-05-10 09:42:08 发布

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分类专栏： python 文章标签： reactor python twisted

本文链接：https://blog.youkuaiyun.com/liu_si_yan/article/details/51074445

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# -*- coding=utf-8 -*-

import os
import re
import sys
from twisted.internet import protocol, reactor

file_url = """GET /sw-search-sp/soft/3a/12350/QQ_8.2.17724.0_setup.1459155849.exe HTTP/1.1
Host: dlsw.baidu.com
Connection: keep-alive
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, sdch
Accept-Language: zh-CN,zh;q=0.8
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.97 Safari/537.36

"""

class client_demo(protocol.Protocol):

	file_handle = None
	total_size = 0
	received_size = 0
	rep_header = None

	SAVE_FILE_HEADER = "E:\\python\\twisted\\header.txt"
	SAVE_FILE_NAME = "E:\\python\\twisted\\file.exe"

	def connectionMade(self):
		print("connectionMade")
		print("remote client: {}:{}".format(self.transport.getPeer().host, self.transport.getPeer().port))
		if os.path.exists(self.SAVE_FILE_HEADER):
			os.remove(self.SAVE_FILE_HEADER)
		if os.path.exists(self.SAVE_FILE_NAME):
			os.remove(self.SAVE_FILE_NAME)
		self.transport.write(file_url)

	def connectionLost(self, reason):
		print("connectionLost")
		print("remote client: {}:{}".format(self.transport.getPeer().host, self.transport.getPeer().port))
		print("reason: {}".format(reason))
		if self.file_handle:
			self.file_handle.close()
		print("total received size: {}".format(self.received_size))

	def dataReceived(self, data):

		try:
			hdr_end_pos = data.find("\r\n\r\n")

			#get response header
			if not self.rep_header:
				self.rep_header = data[:hdr_end_pos]
				print(self.rep_header)
				self.total_size = re.findall("Content-Length:\s(\d+)\r\n", self.rep_header, re.IGNORECASE)[0]

			#get response first packet of data
			if not self.file_handle:
				self.file_handle = open(self.SAVE_FILE_NAME, "wb")
				file_data = data[hdr_end_pos + 4:]
			else:
				file_data = data
			self.received_size += len(file_data)
			sys.stdout.write("dataReceived: {} bytes, {}/{} bytes\r".format(len(data), self.received_size, self.total_size))
			sys.stdout.flush()

			self.file_handle.write(file_data)

		except Exception as e:
			print("Error: {}".format(e))
		

class client_factory(protocol.ClientFactory):

	protocol = client_demo
	
	def clientConnectionFailed(self, connector, reason):
		print("clientConnectionFailed")
		reactor.stop()

	def clientConnectionLost(self, connector, reason):
		print("clientConnectionLost")
		reactor.stop()

def main():
	c = client_factory()
	reactor.connectTCP("dlsw.baidu.com", 80, c)
	reactor.run()

if __name__ == "__main__":
	main()