socket file transfer and validation based on python3

socket based file transfer and MD5 value verification, for your reference, the specific content is as follows

File transfer is divided into two classes, one for the server and one for the client.

The client initiates the request to send or receive the file, and the server receives or sends the file after receiving the request, and finally checks the value of MD5

socket data is packaged through the struct module

When the file needs to be sent to the server, the sendFile function is called. The struct package contains file information, file size, file MD5 and other information. The server performs MD5 value verification after receiving the file, and returns success after successful verification

When the file needs to be downloaded from the server, the recvFile function is called and the MD5 verification is performed after the file is received

The client class code is as follows

import socket
import struct,os
import subprocess
 
dataFormat='8s32s100s100sl'
 
class fileClient():
 def __init__(self,addr):
  self.addr = addr
  self.action = ''
  self.fileName = ''
  self.md5sum = ''
  self.clientfilePath = ''
  self.serverfilePath = ''
  self.size = 0
 
 def struct_pack(self):
  ret = struct.pack(dataFormat,self.action.encode(),self.md5sum.encode(),self.clientfilePath.encode(),
       self.serverfilePath.encode(),self.size)
  return ret
 
 def struct_unpack(self,package):
  self.action,self.md5sum,self.clientfilePath,self.serverfilePath,self.size = struct.unpack(dataFormat,package)
  self.action = self.action.decode().strip('\x00')
  self.md5sum = self.md5sum.decode().strip('\x00')
  self.clientfilePath = self.clientfilePath.decode().strip('\x00')
  self.serverfilePath = self.serverfilePath.decode().strip('\x00')
 
 def sendFile(self,clientfile,serverfile):
  if not os.path.exists(clientfile):
   print(' The source file / Folder does not exist ')
   return "No such file or directory"
  self.action = 'upload'
  (status, output) = subprocess.getstatusoutput("md5sum " + clientfile + " | awk '{printf $1}'")
  if status == 0:
   self.md5sum = output
  else:
   return "md5sum error:"+status
  self.size = os.stat(clientfile).st_size
  self.serverfilePath = serverfile
  self.clientfilePath = clientfile
  ret = self.struct_pack()
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  try:
   s.connect(self.addr)
   s.send(ret)
   recv = s.recv(1024)
   if recv.decode() == 'dirNotExist':
    print(" The target file / Folder does not exist ")
    return "No such file or directory"
   elif recv.decode() == 'ok':
    fo = open(clientfile, 'rb')
    while True:
     filedata = fo.read(1024)
     if not filedata:
      break
     s.send(filedata)
    fo.close()
    recv = s.recv(1024)
    if recv.decode() == 'ok':
     print(" File transfer successful ")
     s.close()
     return 0
    else:
     s.close()
     return "md5sum error:md5sum is not correct!"
  except Exception as e:
   print(e)
   return "error:"+str(e)
 
 def recvFile(self,clientfile,serverfile):
  if not os.path.isdir(clientfile):
   filePath,fileName = os.path.split(clientfile)
  else:
   filePath = clientfile
  if not os.path.exists(filePath):
   print(' Local object file / Folder does not exist ')
   return "No such file or directory"
  self.action = 'download'
  self.clientfilePath = clientfile
  self.serverfilePath = serverfile
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  try:
   s.connect(self.addr)
   ret = self.struct_pack()
   s.send(ret)
   recv = s.recv(struct.calcsize(dataFormat))
   self.struct_unpack(recv)
   if self.action.startswith("ok"):
    if os.path.isdir(clientfile):
     fileName = (os.path.split(serverfile))[1]
     clientfile = os.path.join(clientfile, fileName)
    self.recvd_size = 0
    file = open(clientfile, 'wb')
    while not self.recvd_size == self.size:
     if self.size - self.recvd_size > 1024:
      rdata = s.recv(1024)
      self.recvd_size += len(rdata)
     else:
      rdata = s.recv(self.size - self.recvd_size)
      self.recvd_size = self.size
     file.write(rdata)
    file.close()
    print('\n Wait for the check ...')
    (status, output) = subprocess.getstatusoutput("md5sum " + clientfile + " | awk '{printf $1}'")
    if output == self.md5sum:
     print(" File transfer successful ")
    else:
     print(" File validation failed ")
     (status, output) = subprocess.getstatusoutput("rm " + clientfile)
   elif self.action.startswith("nofile"):
    print(' Remote source file / Folder does not exist ')
    return "No such file or directory"
  except Exception as e:
   print(e)
   return "error:"+str(e)

The server class code is as follows

import socket
import struct,os
import subprocess
import socketserver
 
dataFormat='8s32s100s100sl'
 
class fileServer(socketserver.StreamRequestHandler):
 def struct_pack(self):
  ret = struct.pack(dataFormat, self.action.encode(), self.md5sum.encode(), self.clientfilePath.encode(),
       self.serverfilePath.encode(), self.size)
  return ret
 
 def struct_unpack(self, package):
  self.action, self.md5sum, self.clientfilePath, self.serverfilePath, self.size = struct.unpack(dataFormat,
                          package)
  self.action = self.action.decode().strip('\x00')
  self.md5sum = self.md5sum.decode().strip('\x00')
  self.clientfilePath = self.clientfilePath.decode().strip('\x00')
  self.serverfilePath = self.serverfilePath.decode().strip('\x00')
 
 def handle(self):
  print('connected from:', self.client_address)
  fileinfo_size = struct.calcsize(dataFormat)
  self.buf = self.request.recv(fileinfo_size)
  if self.buf:
   self.struct_unpack(self.buf)
   print("get action:"+self.action)
   if self.action.startswith("upload"):
    try:
     if os.path.isdir(self.serverfilePath):
      fileName = (os.path.split(self.clientfilePath))[1]
      self.serverfilePath = os.path.join(self.serverfilePath, fileName)
     filePath,fileName = os.path.split(self.serverfilePath)
     if not os.path.exists(filePath):
      self.request.send(str.encode('dirNotExist'))
     else:
      self.request.send(str.encode('ok'))
      recvd_size = 0
      file = open(self.serverfilePath, 'wb')
      while not recvd_size == self.size:
       if self.size - recvd_size > 1024:
        rdata = self.request.recv(1024)
        recvd_size += len(rdata)
       else:
        rdata = self.request.recv(self.size - recvd_size)
        recvd_size = self.size
       file.write(rdata)
      file.close()
      (status, output) = subprocess.getstatusoutput("md5sum " + self.serverfilePath + " | awk '{printf $1}'")
      if output == self.md5sum:
       self.request.send(str.encode('ok'))
      else:
       self.request.send(str.encode('md5sum error'))
    except Exception as e:
     print(e)
    finally:
     self.request.close()
   elif self.action.startswith("download"):
    try:
     if os.path.exists(self.serverfilePath):
      (status, output) = subprocess.getstatusoutput("md5sum " + self.serverfilePath + " | awk '{printf $1}'")
      if status == 0:
       self.md5sum = output
      self.action = 'ok'
      self.size = os.stat(self.serverfilePath).st_size
      ret = self.struct_pack()
      self.request.send(ret)
      fo = open(self.serverfilePath, 'rb')
      while True:
       filedata = fo.read(1024)
       if not filedata:
        break
       self.request.send(filedata)
      fo.close()
     else:
      self.action = 'nofile'
      ret = self.struct_pack()
      self.request.send(ret)
    except Exception as e:
     print(e)
    finally:
     self.request.close()

Call server and start the service

import fileSocket
import threading
import socketserver
import time
 
serverIp = '127.0.0.1'
serverPort = 19821
serverAddr = (serverIp,serverPort)
 
class fileServerth(threading.Thread):
 def __init__(self):
  threading.Thread.__init__(self)
  self.create_time = time.time()
  self.local = threading.local()
 
 def run(self):
  print("fileServer is running...")
  fileserver.serve_forever()
 
fileserver = socketserver.ThreadingTCPServer(serverAddr, fileSocket.fileServer)
fileserverth = fileServerth()
fileserverth.start()

Call client to send/receive the file

import fileSocket
 
serverIp = '127.0.0.1'
serverPort = 19821
serverAddr = (serverIp,serverPort)
 
fileclient = fileSocket.fileClient(serverAddr)
fileclient.sendFile('fromClientPath/file','toServerPath/file')
fileclient.recvFile('toClientPath/file','fromServerPath/file')