Sending a file from local to server using python - the correct way

Question

Probably a simple question for those who used to play with socket module. But I didn't get to understand so far why I can't send a simple file.

As far as I know there are four important steps when we send an info over a socket:

• open a socket
• bind
• listen
• accept ( possibly needed multiple times ).

Now, what I want to do is creating a file on my local machine and fill it with some info. ( been there, done that - all good so far )

Then, I create my client flow, which is the following:

s = socket.socket() # create a socket
s.connect(("localhost", 8081)) # trying to connect to connect over 8081 port

f = open("logs.txt", "rb+") # I'm opening the file that contains what I want
l = f.read(1024) # I'm reading that file

# I'm sending all the info from the file
while l:
    s.send(l)
    l = f.read(1024)
s.close()

Of course, firstly, I'm creating a server (at first, on my localhost) which will open that port and basically create the connection which will allow the byte-chunked data to be sent.

import socket
import sys

s = socket.socket() # create the socket
s.bind(("localhost", 8081)) # bind
s.listen(10)

while True:
    sc, address = s.accept()
    print sc, address
    f = open('logs_1.txt', 'wb+') # trying to open a new file on the server ( which in this case is also my localhost )
    while True: # write all the data to the file and close everything
        l = sc.recv(1024)
        f.write(l)
        l = sc.recv(1024)
        while l:
            f.write(l)
            l = sc.recv(1024)
    f.close()
    sc.close()
s.close()

Now, what doesn't work on my Ubuntu 14.10 machine:

• the server part runs without error when doing python server.py

• after the client script finishes writing some data in logs.txt and connects to the server, I get the following response on the server:

  <socket._socketobject object at 0x7fcdb3cf4750> ('127.0.0.1', 56821)
  

What am I doing wrong ? The port is also different from the one that I set ( I also know that the port is not used - verifiet with nc ).

Can anybody explain me how to correctly treat this problem ?

Answer 1

I'm not sure what your second while True loop is for. Remove that, and it works as you expect:

import socket
import sys

s = socket.socket() # create the socket
s.bind(("localhost", 8081)) # bind
s.listen(10)

while True:
    sc, address = s.accept()
    print sc, address
    f = open('logs_1.txt', 'wb+')
    l = sc.recv(1024)
    while l:
        f.write(l)
        l = sc.recv(1024)
    f.close()
    sc.close()
s.close()