Since the folder may have a multi-layer directory, so it needs to be recursive traversal.
This paper took the simple protocol customization, defines five commands, instructions Head as follows:
Sync: identifies the start synchronizing folders
End: identifying end synchronization
File: file name identifies the transfer of (relative path)
Folder: flag folder (relative path)
None :document content
Each command CMB_BEGIN begin to CMB_END end.
The client needs to be done to resolve the receive buffer, an extraction of an instruction, then do instructions Head according to corresponding processing, such as create folders, files written.
Here is the server code:
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 Client after receiving a signal of (this code, when just send anything to Client Server can), Server gets called send_file_folder the contents of the folder under sever all sent to the client.
The server runs the results are as follows: 
The following is the client code:
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()
The client extracts the command from the Server when extracted Sync command, it will sourceDir empty directory, then under the follow instructions, file with the Server folder for synchronization.
The client runs as follows: 
where Note:
When Client written to the file, you need to open the file in binary mode, otherwise, errors may occur or lead to corrupted files when transferring binary files.
After testing, the code can be a normal operation, the folder synchronization is successful, text files, images, and other types of binary files can be normal transmission.
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