Question

In: Computer Science

In this part, you will implement a Server class that will accept only one connection, process...

In this part, you will implement a Server class that will accept only one connection, process its requests, and then the Server will end.

Create a Server class in the package edu.ucdenver.server

The constructor should take the port and backlog to open the server.

The server should implement the Runnable interface.

Override the following public methods:

public void run()

This will implement your server. Similar to runServer() from our lecture examples.

Upon a client connection, the server will listen for requests. Once one is received, will be processed (see below) and the response will be send to the server.

Keep accepting requests until the client disconnect. No termination message will be send, the client will just disconnect.

Protocol:

the communication will be text based.

fields will be delimited by a vertical bar ( | )

clients may send either two requests:

"E|text" -> requesting the server to encode the clean text "text" into Morse Code

"D|morse" -> requesting the server to decode the received text "morse" from Morse Code to clean text

Server may respond:

"0|text" -> to either E and D requests. Text will correspond with either the encoded or decoded string.

"1|Not Implemented" -> if the server got a requests unrecognized by the server. E.g. "C|" or "E Hello world"

"2|Invalid Message Format" -> if the message format is not correct. Eg. "E", the command is correct but the arguments received are not (in this case no text was sent).

Important Notes:

Quotes were added just to delimit the message descriptions, and are not part of the actual message.

Make sure to use the Class defined in Part #1

To test your server, use the text-based client class implemented in our hands-on examples. We will be using a variation of that to test your server.

Make sure your server terminates after the client disconnects. Your code test will be aborted otherwise.

Expert Solution

#import socket module
__author__ = 'Xi Su'

from socket import *
import datetime

"""
memo:
"**".join() :for loop join string and concatenate by **
date format use date.date.now.strftime()

"""
serverSocket = socket(AF_INET, SOCK_STREAM) #Prepare a sever socket
#Fill in start

serverPort = 6789
serverSocket.bind(('',serverPort))
serverSocket.listen(5)

#Fill in end
while True:
   #Establish the connection
   print 'Ready to serve...'
   connectionSocket, addr = serverSocket.accept()
   print "addr:\n", addr
   #Fill in start
   #Fill in end
   try:
       message = connectionSocket.recv(1024)#Fill in start #Fill in end
       print "message: \n", message
       filename = message.split()[1]
       f = open(filename[1:])
       outputdata = f.read()
       print "outputdata:", outputdata
       now = datetime.datetime.now()
       #Fill in start #Fill in end
       #Send one HTTP header line into socket
       #Fill in start
       first_header = "HTTP/1.1 200 OK"
       # alive ={
       #    "timeout":10,
       #    "max":100,
       # }
       header_info = {
           "Date": now.strftime("%Y-%m-%d %H:%M"),
           "Content-Length": len(outputdata),
           "Keep-Alive": "timeout=%d,max=%d" %(10,100),
           "Connection": "Keep-Alive",
           "Content-Type": "text/html"
       }

       following_header = "\r\n".join("%s:%s" % (item, header_info[item]) for item in header_info)
       print "following_header:", following_header
       connectionSocket.send("%s\r\n%s\r\n\r\n" %(first_header, following_header))
       # connectionSocket.send("\r\n")
       # Date: %s\r\nKeep-Alive: timeout=10, max=100\r\n Connection: nKeep-Alive\r\n Content-Type: text/html;charset= utf-8" %(now.strftime("%Y-%m-%d %H:%m")))
       #Fill in end
       #Send the content of the requested file to the client
       for i in range(0, len(outputdata)):
           connectionSocket.send(outputdata[i])
       connectionSocket.close()
   except IOError:
       #Send response message for file not found
       #Fill in start
       connectionSocket.send("HTTP/1.1 404 Not Found\r\nContent-Type: text/html\r\n\r\n<!doctype html><html><body><h1>404 Not Found<h1></body></html>")
       #Fill in end
       #Close client socket
       #Fill in start
       connectionSocket.close()
       #Fill in end
serverSocket.close()

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