command line input (arg parse) and data exchange - Printable Version +- Python Forum (https://python-forum.io) +-- Forum: Python Coding (https://python-forum.io/forum-7.html) +--- Forum: General Coding Help (https://python-forum.io/forum-8.html) +--- Thread: command line input (arg parse) and data exchange (/thread-22980.html) |
command line input (arg parse) and data exchange - Simba - Dec-06-2019 Hi guys hope you are all keeping cool. i am having an issue with my python program that I was writing. I am trying to make small server & client program for high school students to motivate them to learn coding. but i am running into difficulties. i was trying to get the user input from the command line (ubuntu to be precise) so like when a student enters the command to run the program with arguments (port number, buffer length & IP address) the program runs the client part of it. client then takes the length of buffer, takes the port number and ip from command line and assigns to the variables. it then generates a random number between 1 and 100 and sends to the port entered. Then when they enter the command to run the server side code with argument (port number only), the server listen to the port and receives the data and sends it back to the client. the buffer length is to specify how much data the client will transmit to server. the commands that student put are as follows. ./clientServer.py –t –p 5001 –l 1000 –ip 127.0.0.1 where -t to run the client part of code -p to indicate port number -l for buffer length -IP for loop back address. (in real environment the same code will run on 2 different machines, one will run the client part of code and one will run the server part of code) ./clientServer.py –r –p 5001 where -r to run the server part of code -p for the port number but i am having issues in parsing data and running the file. so if you guys can help me i would really appreciate that and will be really thankful to you guys. here is the code import socket import time import argparse from random import randint def main(): clientSock= socket.socket(socket.AF_INET, socket. SOCK_STREAM) #here is the argv parses parser = argparse.ArgumentParser(description = 'sending data to server and back to client') parser.add_argument('-t', '--transmit', action='store_true', help='transmission') parser.add_argument('-r', '--receive', action='store_true', help='receiving') parser.add_argument('-ip', '--serveripAddr', default=('127.0.0.1'), required = True, help='this is ip address') parser.add_argument('-p', '--serverport', type=int, default=5001, required = True, help='this is port number') parser.add_argument('-l', '--bufferSize', type=int, default=8192, required = True, help='this is buffer size') args = parser.parse_args() serverAddr = args.ip port = args.p buffersize = args.l if args.t: clientSock.connect(port, serverAddr, buffersize) number = randint(1,100) dataOutStr= bin(number).replace("0b", "") # converts the numbers into binary before sending dataOutBytes= dataOutStr.encode() start = time.time() #start timer clientSock.sendall(dataOutBytes) # sending data numBytes= len(dataOutBytes) #===================================================================================================== #loop until all data receivedd dataInBytes= b'' while len(dataInBytes) < numBytes: dataInBytes+= clientSock.recv(numBytes-len(dataInBytes)) if not dataInBytes: break dataInStr= dataInBytes.decode() remoteAddr= clientSock.getpeername() print( "received", dataInStr, "back from server", remoteAddr) print ("it took ", time.time()-start) clientSock.close() elif args.r: serverSock= socket.socket(socket.AF_INET,socket.SOCK_STREAM) serverSock.bind(('', 5001)) serverSock.listen() while True: connectSock, clientAddr= serverSock.accept() print( "Connection from", clientAddr) while True: # keep receiving until client close message = connectSock.recv() if not message: break connectSock.sendall(message) connectSock.close() else : print("something went wrong") if __name__== '__main__': main() The program is not Running and also not assigning the values to the variables. can anyone help me please. RE: command line input (arg parse) and data exchange - Larz60+ - Dec-06-2019 check out: https://pymotw.com/3/argparse/ It's a very good tutorial for Argparse RE: command line input (arg parse) and data exchange - Simba - Dec-06-2019 ok so,i have managed to sort out few things but the code is not functional. it is running, but its doing nothing. seems like stuck in a non stop loop can anyone help please.... import socket import time import argparse from random import randint clientSock= socket.socket(socket.AF_INET, socket. SOCK_STREAM) #here is the argv pasrse parser = argparse.ArgumentParser(description = 'sending data to server and back to client') parser.add_argument('-t', action='store_true', help='transmission') parser.add_argument('-r', action='store_true', help='recieving') parser.add_argument('-ip', default=('127.0.0.1'), help='this is ip address') parser.add_argument('-p', type=int, default=5001, help='this is port number') parser.add_argument('-l', type=int, default=8192, help='this is buffer size') args = parser.parse_args() hostAddr = args.ip port = args.p bufferLenght = args.l if args.t: clientSock.connect((hostAddr, port)) buffcounter = 0 dataOutBytes = '' for x in range (bufferLenght): number = randint(1,9) dataOutStr= bin(number).replace("0b", "") dataOutBytes+= dataOutStr dataOutBytes = dataOutStr.encode() numBytes= len(dataOutBytes) start = time.time() clientSock.sendall(dataOutBytes) #============================================================================ #loop until all data recieved dataInBytes= b'' while len(dataInBytes) < numBytes: dataInBytes+= clientSock.recv(numBytes-len(dataInBytes)) if not dataInBytes: break dataInStr= dataInBytes.decode() remoteAddr= clientSock.getpeername() print( "received", dataInStr, "back from server", remoteAddr) print ("it took ", time.time()-start) clientSock.close() elif args.r: serverSock= socket.socket(socket.AF_INET,socket.SOCK_STREAM) serverSock.bind(('', port)) serverSock.listen() print ("The server is ready to receive!") while True: connectSock, clientAddr= serverSock.accept() print( "Connection from", clientAddr) while True: # keep receiving until client close message = connectSock.recv(1024) if not message: break connectSock.sendall(message) connectSock.close() if args.t: clientSock.connect((hostAddr, port)) buffcounter = 0 dataOutBytes = '' for x in range (bufferLenght): number = randint(1,9) dataOutStr= bin(number).replace("0b", "") dataOutBytes+= dataOutStr dataOutBytes = dataOutStr.encode() numBytes= len(dataOutBytes) start = time.time() clientSock.sendall(dataOutBytes) #============================================================================ #loop until all data recieved dataInBytes= b'' while len(dataInBytes) < numBytes: dataInBytes+= clientSock.recv(numBytes-len(dataInBytes)) if not dataInBytes: break dataInStr= dataInBytes.decode() remoteAddr= clientSock.getpeername() print( "received", dataInStr, "back from server", remoteAddr) print ("it took ", time.time()-start) clientSock.close()its defiantly something in this part of the code.. RE: command line input (arg parse) and data exchange - Larz60+ - Dec-06-2019 please do not send PM. Post here to share. RE: command line input (arg parse) and data exchange - Simba - Dec-06-2019 Can anyone help please? RE: command line input (arg parse) and data exchange - snippsat - Dec-06-2019 Dos the network code work without argparse? Simba Wrote:The program is not Running and also not assigning the values to the variables.This is't helpful at all to understand the what's going on. It's good idea to test the core stuff without any abstraction. Keep it as simple as possible to start with,no argparse only the network code. Then post that code with if getting errors(the whole Traceback message). RE: command line input (arg parse) and data exchange - Simba - Dec-06-2019 it is working. and now even the argvparse is working but now the whole issue is that i am trying to run the randint() function to generate the same amount of data as buffer length specified by the user and then store it in the string before encoding and transmitting to the server. hostAddr = args.ip port = args.p bufferLenght = args.l if args.t: clientSock.connect((hostAddr, port)) buffcounter = 0 dataOutBytes = '' while bufferLenght >0: number = randint(1,9) dataOutStr= bin(number).replace("0b", "") dataOutBytes+= dataOutStr bufferLenght = bufferLenght - 1 dataOutBytes = dataOutStr.encode() numBytes= len(dataOutBytes) start = time.time() clientSock.sendall(dataOutBytes)like literally this part is having issues. RE: command line input (arg parse) and data exchange - Simba - Dec-06-2019 can anyone please help me? |