本文采取了簡單的協(xié)議定制，定義了五條命令，指令Head如下：
Sync：標(biāo)識(shí)開始同步文件夾
End：標(biāo)識(shí)結(jié)束同步
File：標(biāo)識(shí)傳輸?shù)奈募ㄏ鄬β窂剑?br /> Folder：標(biāo)志文件夾（相對路徑）
None：文件內(nèi)容

每條命令以CMB_BEGIN開始，以CMB_END結(jié)束。

客戶端需要對接收緩沖做解析，取出一條一條的指令，然后根據(jù)指令的Head做相應(yīng)的處理，比如創(chuàng)建文件夾、寫入文件等。

下面是服務(wù)端的代碼：

from twisted.internet import reactor
from twisted.internet.protocol import Protocol,Factory
from twisted.protocols.basic import LineReceiver
import os
import struct
 
BUFSIZE = 4096
 
class SimpleLogger(Protocol):
  def connectionMade(self):
    print 'Got connection from', self.transport.client
 
  def connectionLost(self, reason):
    print self.transport.client, 'disconnected'
 
  def dataReceived(self, line):
    print line
    self.transport.write("Hello Client, I am the Server!\r\n")
 
    self.transport.write("CMB_BEGIN")
    self.transport.write("Sync")
    self.transport.write("CMB_END")
    self.send_file_folder('server')
 
  def send_file_folder(self,folder):
    '''send folder to the client'''
    for f in os.listdir(folder):
      sourceF = os.path.join(folder, f)
      if os.path.isfile(sourceF):      
        print 'File:',sourceF[7:]
        self.transport.write("CMB_BEGIN")
        self.transport.write("File:" + sourceF[7:])
        self.transport.write("CMB_END")
        fp = open(sourceF,'rb')
        while 1:
          filedata = fp.read(BUFSIZE)
          if not filedata: break
          else:
            self.transport.write("CMB_BEGIN")
            self.transport.write(filedata)
            print 'send size:::::::::',len(filedata)
            self.transport.write("CMB_END")
        fp.close()
        self.transport.write("CMB_BEGIN")
        self.transport.write("End")
        self.transport.write("CMB_END")
      if os.path.isdir(sourceF):
        print 'Folder:',sourceF[7:]
        self.transport.write("CMB_BEGIN")
        self.transport.write("Folder:" + sourceF[7:])
        self.transport.write("CMB_END")
        self.send_file_folder(sourceF)
 
factory = Factory()
factory.protocol = SimpleLogger
reactor.listenTCP(1234, factory)
reactor.run()

Server在收到Client的某個(gè)信號(hào)之后(此代碼中，當(dāng)Client隨便向Server發(fā)送任何內(nèi)容都可)，Server即會(huì)調(diào)用send_file_folder將sever文件夾下的內(nèi)容全部發(fā)送給客戶端。

服務(wù)端運(yùn)行結(jié)果如下：

下面是客戶端的代碼：

from twisted.internet.selectreactor import SelectReactor
from twisted.internet.protocol import Protocol,ClientFactory
from twisted.protocols.basic import LineReceiver
import os
from struct import *
 
reactor = SelectReactor()
protocol = Protocol()
prepare = 0
filename = ""
sourceDir = 'client'
recvBuffer = ''
 
def delete_file_folder(src):
  '''delete files and folders'''
  if os.path.isfile(src):
    try:
      os.remove(src)
    except:
      pass
  elif os.path.isdir(src):
    for item in os.listdir(src):
      itemsrc = os.path.join(src,item)
      delete_file_folder(itemsrc) 
    try:
      os.rmdir(src)
    except:
      pass
 
def clean_file_folder(src):
  '''delete files and child folders'''
  delete_file_folder(src)
  os.mkdir(src)
 
def writefile(filename,data):
  print 'write file size:::::::::',len(data)
  fp = open(filename,'a+b')
  fp.write(data)
  fp.close()
 
class QuickDisconnectedProtocol(Protocol):
  def connectionMade(self):
    print "Connected to %s."%self.transport.getPeer().host
    self.transport.write("Hello server, I am the client!\r\n")
  def dataReceived(self, line):
    global prepare
    global filename
    global sourceDir
    global recvBuffer
 
    recvBuffer = recvBuffer + line
    self.processRecvBuffer()
 
  def processRecvBuffer(self):
    global prepare
    global filename
    global sourceDir
    global recvBuffer
 
    while len(recvBuffer) > 0 :
      index1 = recvBuffer.find('CMB_BEGIN')
      index2 = recvBuffer.find('CMB_END')
 
      if index1 >= 0 and index2 >= 0:
        line = recvBuffer[index1+9:index2]
        recvBuffer = recvBuffer[index2+7:]
 
        if line == 'Sync':
          clean_file_folder(sourceDir)
 
        if line[0:3] == "End":
          prepare = 0
        elif line[0:5] == "File:":
          name = line[5:]
          filename = os.path.join(sourceDir, name)
          print 'mk file:',filename
          prepare = 1
        elif line[0:7] == "Folder:":
          name = line[7:]
          filename = os.path.join(sourceDir, name)
          print 'mkdir:',filename
          os.mkdir(filename)
        elif prepare == 1:
          writefile(filename,line)
      else:
        break 
 
class BasicClientFactory(ClientFactory):
  protocol=QuickDisconnectedProtocol
  def clientConnectionLost(self,connector,reason):
    print 'Lost connection: %s'%reason.getErrorMessage()
    reactor.stop()
  def clientConnectionFailed(self,connector,reason):
    print 'Connection failed: %s'%reason.getErrorMessage()
    reactor.stop()
 
reactor.connectTCP('localhost',1234,BasicClientFactory())
reactor.run()

客戶端提取出來自Server的指令，當(dāng)提取出Sync指令時(shí)，則將sourceDir目錄清空，然后根據(jù)后續(xù)的指令，跟Server的文件夾進(jìn)行同步。

客戶端運(yùn)行結(jié)果如下：