import socket 
import os 
import sys 
import time 
 
Host = '127.0.0.1' 
Port = 12000 
Addr = (Host, Port) 
 
sockListener = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
sockListener.bind(Addr) 
sockListener.listen(5) 
 
def recvfile(cliSocket): 
  print('start reveiving file...') 
  msg = 'no problem' 
  msg_utf8 = msg.encode(encoding="utf-8") 
  cliSocket.send(msg_utf8) 
  filename_utf8 = clientSocket.recv(4096) 
  filename = filename_utf8.decode() 
  f = open(filename, 'wb') 
  while True: 
    data_utf8 = cliSocket.recv(4096) 
    data = data_utf8.decode() 
    if data=='EOF': 
      print('received file successfully') 
      break 
    f.write(data_utf8) 
  f.close() 
 
def sendfile(cliSocket): 
  print('start sending file...') 
  msg = 'no problem' 
  msg_utf8 = msg.encode(encoding="utf-8") 
  cliSocket.send(msg_utf8) 
  filename_utf8 = cliSocket.recv(4096) 
  filename = filename_utf8.decode() 
  f = open(filename, 'rb') 
  while True: 
    data = f.read(4096) 
    if not data: 
      break 
    cliSocket.sendall(data) 
  f.close() 
  time.sleep(1) 
  msg = 'EOF' 
  msg_utf8 = msg.encode(encoding="utf-8") 
  cliSocket.sendall(msg_utf8) 
  print('sent file successfully') 
 
def getList(cliSocket): 
  path = sys.path[0] 
  every_file = os.listdir(path) 
  for filename in every_file: 
    pathmsg = filename + '\n' 
    pathmsg_utf8 = pathmsg.encode(encoding="utf-8") 
    cliSocket.sendall(pathmsg_utf8) 
  time.sleep(1) 
  msg = 'EOF' 
  msg_utf8 = msg.encode(encoding="utf-8") 
  cliSocket.sendall(msg_utf8) 
  print('all filenames have been send') 
 
while True: 
  print('waiting for connection...') 
  clientSocket, addr = sockListener.accept() 
  print('... connection from:', addr) 
 
  while True: 
    msg_utf8 = clientSocket.recv(4096) 
    msg = msg_utf8.decode() 
    if msg=='exit': 
      print(addr, 'close the connection') 
      break 
    elif msg=='get': 
      sendfile(clientSocket) 
    elif msg=='put': 
      recvfile(clientSocket) 
    elif msg=='list': 
      getList(clientSocket) 
    else: 
      print('client error!') 
      break 

import socket 
import time 
 
Host = '127.0.0.1' 
Port = 12000 
Addr = (Host, Port) 
 
clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
clientSocket.connect(Addr) 
 
def recvfile(filename): 
  print('start receiving file...') 
  f = open(filename, 'wb') 
  filename_utf8 = filename.encode(encoding="utf-8") 
  clientSocket.sendall(filename_utf8) 
  while True: 
    data_utf8 = clientSocket.recv(4096) 
    data=data_utf8.decode() 
    if data=='EOF': 
      print('receive file successfully') 
      break 
    f.write(data_utf8) 
  f.close() 
 
def sendfile(filename): 
  print('start sending file...') 
  f = open(filename, 'rb') 
  filename_utf8 = filename.encode(encoding="utf-8") 
  clientSocket.sendall(filename_utf8) 
  while True: 
    data = f.read(4096) 
    if not data: 
      break 
    clientSocket.sendall(data) 
  f.close() 
  time.sleep(1) 
  endmsg = 'EOF' 
  endmsg_utf8 = endmsg.encode(encoding="utf-8") 
  clientSocket.sendall(endmsg_utf8) 
  print('send file successfully') 
 
def confirm(confirm_command): 
  confirm_command_utf8 = confirm_command.encode(encoding="utf-8") 
  clientSocket.sendall(confirm_command_utf8) 
  msg_utf8 = clientSocket.recv(4096) 
  msg = msg_utf8.decode() 
  print('reveive message:', msg) 
  if msg=='no problem': 
    return True 
  else: 
    return False 
 
def operation1(filename): 
  if confirm('get'): 
    recvfile(filename) 
  else: 
    print('serve error!') 
 
def operation2(filename): 
  if confirm('put'): 
    sendfile(filename) 
  else: 
    print('serve error!') 
 
def operation3(act): 
  if act=='list': 
    act_utf8 = act.encode(encoding="utf-8") 
    clientSocket.sendall(act_utf8) 
    while True: 
      msg_utf8 = clientSocket.recv(1024) 
      msg = msg_utf8.decode() 
      if msg=='EOF': 
        break 
      print(msg) 
  else: 
    print('wrong command!') 
try: 
  while True: 
    command = input('>>>') 
    if not command: 
      continue 
    elif command=='exit': 
      command_utf8 = command.encode(encoding="utf-8") 
      clientSocket.sendall(command_utf8) 
      print('the connection is closed') 
      break 
    msg = command.split() 
    if len(msg)==2 and msg[0]=='get': 
      operation1(msg[1]) 
    elif len(msg)==2 and msg[0]=='put': 
      operation2(msg[1]) 
    elif len(msg)==1: 
      operation3(msg[0]) 
    else: 
      print('wrong command!') 
except socket.error as e: 
  print('error:', e) 
  print('an error causes the connection to close!') 
  clientSocket.close()