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我创建了一个接收请求的代理服务器,在其缓存中搜索请求的文件。如果可用,则返回缓存的文件。如果文件不可用,那么它会询问实际的服务器,获取它,将其存储在缓存中并将文件返回给客户端。针对网络服务器的Python套接字编程
以下是代码:
from socket import *
import sys
if len(sys.argv) <= 1:
print 'Usage : "python ProxyServer.py server_ip"\n[server_ip : It is the IP Address Of Proxy Server'
sys.exit(2)
# Create a server socket, bind it to a port and start listening
tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind((sys.argv[1], 8888))
tcpSerSock.listen(100)
while 1:
# Strat receiving data from the client
print 'Ready to serve...'
tcpCliSock, addr = tcpSerSock.accept()
print 'Received a connection from:', addr
message = tcpCliSock.recv(1024)
print message
# Extract the filename from the given message
print message.split()[1]
filename = message.split()[1].partition("/")[2]
print filename
fileExist = "false"
filetouse = "/" + filename
print filetouse
try:
# Check wether the file exist in the cache
f = open(filetouse[1:], "r")
outputdata = f.readlines()
fileExist = "true"
# ProxyServer finds a cache hit and generates a response message
tcpCliSock.send("HTTP/1.0 200 OK\r\n")
tcpCliSock.send("Content-Type:text/html\r\n")
for i in range(0, len(outputdata)):
tcpCliSock.send(outputdata[i])
print 'Read from cache'
# Error handling for file not found in cache
except IOError:
if fileExist == "false":
# Create a socket on the proxyserver
c = socket(AF_INET, SOCK_STREAM)
hostn = filename.replace("www.","",1)
print hostn
try:
# Connect to the socket to port 80
c.connect((hostn, 80))
# Create a temporary file on this socket and ask port 80 for the file requested by the client
fileobj = c.makefile('r', 0)
fileobj.write("GET "+"http://" + filename + " HTTP/1.0\n\n")
# Read the response into buffer
buff = fileobj.readlines()
# Create a new file in the cache for the requested file. Also send the response in the buffer to client socket and the corresponding file in the cache
tmpFile = open("./" + filename,"wb")
for line in buff:
tmpFile.write(line);
tcpCliSock.send(line);
except:
print "Illegal request"
else:
# HTTP response message for file not found
tcpCliSock.send("HTTP/1.0 404 sendErrorErrorError\r\n")
tcpCliSock.send("Content-Type:text/html\r\n")
tcpCliSock.send("\r\n")
# Close the client and the server sockets
tcpCliSock.close()
tcpSerSock.close()
但对于每一个文件我请求我只得到一个“非法请求”消息打印。似乎有一个问题,代理服务器实际上无法检索客户端请求的文件。有人可以告诉我在哪里可以改进代码。 这是我第一次用Python编码,所以请提及任何小错误。
我投票结束这个问题作为题外话题,因为它是关于调试一段特定的代码。我相信这将是在http://codereview.stackexchange.com/ – 2015-04-05 03:35:18
根据主题,根据代码审查帮助中心,该网站是“关于特定的**工作**代码块的反馈”(强调他们的)并且明确地不是用于“解决问题,调试或理解代码片段”。我相信StackOverflow是这个网站的正确站点(因为它似乎是一个合法的问题,而不是“给我这个codez”),假设OP主要对解决这个“非法请求”错误感兴趣。 – Ixrec 2015-04-05 08:10:27