*Please write a python server and client code using the following protocol* The

Question

*Please write a python server and client code using the following protocol*

The server stores a list of received messages and saves them so they can be requested to be sent back to the client at any time by list entry. Messages are ordered by the date they are received and then by number. For example, all diary entries are stored in numerical consecutive order. Message entries will be indicated by the command /a or /A (case insensitive) for Add message followed a space. Diary entries will be entered as single line messages and inside of quotations marks. Message entries marked for removal would utilize /r or /R.

Explanation / Answer

#!/usr/bin/python

#importing library for sockets

import socket

#importing library for getting date and time

from datetime import datetime as dt

#importing library for executing system commands

import commands as cmd

#creating socket

s=socket.socket()

#getting the hostname

host=socket.gethostname()

port=12345

#binding the socket with the host

s.bind((host,port))

#listening to the socket

s.listen(5)

#accepting the connection

c,addr=s.accept()

while True:

#message recieved from the client

message = c.recv(1024)

#getting the first two characters of the message

first_2_chars = message[0:2]

#if first two charaters are /a

if first_2_chars == "/a":

#open the log file

FILE=open("Log","a")

#get todays date and time

date = str(dt.today())

#Write the data to the Log file

#:,: is used as a delimiter

FILE.write(message[2:]+":,:"+date+" ")

FILE.close()

#sending acknowledgement to the user

c.send('Your Message has been recieved successfully')

#if first two characters are /r

elif first_2_chars == "/r":

#creating a temp file

temp=open("temp","w")

#open the log file in read mode

FILE=open("Log","r")

for x in FILE:

#matching the recieved mesasge with the messages in log file

if x.split(":,:")[0]!=message[2:]:

temp.write(x)

temp.close()

FILE.close()

#remove the current log file

cmd.getstatus("echo 'y' | rm Log")

#rename the temp file as the new Log file

cmd.getstatus("mv temp Log")

c.send("Your message was successfully deleted")

Client.py

#!/usr/bin/python

import socket

#creating socket

s=socket.socket()

#getting hostname

host=socket.gethostname()

port=12345

#establishing socket

s.connect((host,port))

while True:

#menu for the user

print "1 : Add a message to the log"

print "2 : Delete a message from the log"

print "3 : Exit"

#to accept the user's choice

ch=raw_input("Enter your choice here : ")

if ch == "1":

#user enter's message he wants to add

message=raw_input("Enter a message to share : ")

s.send("/a"+message)

elif ch == "2":

#user enter's message he wants to delete

message=raw_input("Enter a message to delete : ")

s.send("/r"+message)

elif ch == "3":

break

else:

print "Invalid choice."

continue

#To print the acknowledgement from the user

print s.recv(1024)

s.close()

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