Python 基于Twisted框架的文件夹网络传输源码

由于文件夹可能有多层目录,因此需要对其进行递归遍历。

本文采取了简单的协议定制,定义了五条命令,指令Head如下:
Sync:标识开始同步文件夹
End:标识结束同步
File:标识传输的文件名(相对路径)
Folder:标志文件夹(相对路径)
None:文件内容

每条命令以CMB_BEGIN开始,以CMB_END结束。

客户端需要对接收缓冲做解析,取出一条一条的指令,然后根据指令的Head做相应的处理,比如创建文件夹、写入文件等。

下面是服务端的代码:

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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的某个信号之后(此代码中,当Client随便向Server发送任何内容都可),Server即会调用send_file_folder将sever文件夹下的内容全部发送给客户端。

服务端运行结果如下:

下面是客户端的代码:

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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()

客户端提取出来自Server的指令,当提取出Sync指令时,则将sourceDir目录清空,然后根据后续的指令,跟Server的文件夹进行同步。

客户端运行结果如下:

需要注意的地方:
Client写入文件时,需要以二进制的方式打开文件,否则,在传输二进制文件时可能出现错误或导致文件损坏。

经过测试,代码可以正常的运行,文件夹同步成功,文本文件、图像和其他类型的二进制文件均可正常传输。

原文链接:http://www.icodelogic.com/?p=516

本文链接:https://my.lmcjl.com/post/15662.html

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