fork download 
  1. from socket import *
  2. import sys
  3.  
  4. if len(sys.argv) <= 1:
  5. 	print('Usage : "python ProxyServer.py server_ip"\n[server_ip : It is the IP Address Of Proxy Server')
  6. 	sys.exit(2)
  7.  
  8. # Create a server socket, bind it to a port and start listening
  9. tcpSerSock = socket(AF_INET, SOCK_STREAM)
  10. # TODO start.
  11. tcpSerPort = 7777
  12. tcpSerSock.bind((sys.argv[1], tcpSerPort))
  13. tcpSerSock.listen(1)
  14. # TODO end.
  15. while 1:
  16. 	# Strat receiving data from the client
  17. 	print('Ready to serve...')
  18. 	tcpCliSock, addr = tcpSerSock.accept()
  19. 	print('Received a connection from:', addr)
  20.  
  21. 	# Receive request from the client
  22. 	# TODO start.
  23. 	message = tcpCliSock.recv(1024).decode('utf-8')
  24. 	# TODO end.
  25. 	print(message)
  26.  
  27. 	# Extract the filename from the given message
  28. 	print(message.split()[1])
  29. 	filename = message.split()[1].partition("/")[2]
  30. 	print(filename)
  31. 	fileExist = "false"
  32. 	filetouse = "/" + filename
  33. 	print(filetouse)
  34. 	try:
  35. 		# Check wether the file exist in the cache
  36. 		f = open(filetouse[1:], "r")
  37. 		outputdata = f.readlines()
  38. 		fileExist = "true"
  39.  
  40. 		# ProxyServer finds a cache hit and generates a response message
  41. 		# Send the file data to the client
  42. 		tcpCliSock.send(b"HTTP/1.0 200 OK\r\n")
  43. 		tcpCliSock.send(b"Content-Type: text/html\r\n")
  44. 		# TODO start.
  45. 		for i in range(0, len(outputdata)):
  46. 			tcpCliSock.send(outputdata[i].encode('utf-8'))
  47. 		tcpCliSock.send(b'\r\n')
  48. 		# TODO end.
  49.  
  50. 		print('Read from cache')
  51. 	# Error handling for file not found in cache
  52. 	except IOError:
  53. 		if fileExist == "false":
  54. 			# Create a socket on the proxyserver
  55. 			c = socket(AF_INET, SOCK_STREAM)
  56. 			hostn = filename.replace("www.","",1)
  57. 			print(hostn)
  58. 			try:
  59. 				# Connect to the socket to port 80
  60. 				# TODO start.
  61. 				c.connect((hostn, 80))
  62. 				# TODO end.
  63.  
  64. 				# Create a temporary file on this socket and ask port 80 for the file requested by the client
  65. 				fileobj = c.makefile('rw', None)
  66. 				fileobj.write("GET "+"http://" + filename + " HTTP/1.0\n\n")
  67. 				# Read the response into buffer
  68. 				# TODO start.
  69. 				buf = fileobj.read()	
  70. 				# TODO end.
  71.  
  72. 				# Create a new file in the cache for the requested file.
  73. 				# Also send the response in the buffer to client socket and the corresponding file in the cache
  74. 				tmpFile = open("./" + filename,"wb")
  75. 				# TODO start.
  76. 				for i in range(0, len(buf)):
  77. 					tmpFile.write(buf[i])
  78. 				tcpCliSock.send(tmpFile)
  79. 				# TODO end.
  80. 			except:
  81. 				print("Illegal request")
  82. 		else:
  83. 			# HTTP response message for file not found
  84. 			# Fill in start.
  85. 			tcpCliSock.send(b'HTTP/1.0 404 Not Found\r\n')
  86. 			tcpCliSock.send(b"Content-Type: text/html\r\n\r\n")
  87. 			# Fill in end.
  88. 	# Close the client sockets
  89. 	tcpCliSock.close()
  90. # Close the server socket
  91. # TODO start.
  92. tcpSerSock.close()
  93. # TODO end.
  94.  
Runtime error #stdin #stdout 0.02s 9472KB
comments (?)
stdin 
Standard input is empty
stdout 
Usage : "python ProxyServer.py server_ip"
[server_ip : It is the IP Address Of Proxy Server
https://ideone.com/iJhtwj
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
public

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