使用ftplib进行多线程上传。

Question

我试图做多线程上传，但得到错误.我猜测，也许它是不可能使用多线程与ftplib？

下面是我的代码。

    class myThread (threading.Thread):
    def __init__(self, threadID, src, counter, image_name):
        self.threadID = threadID
        self.src = src
        self.counter = counter
        self.image_name = image_name
        threading.Thread.__init__(self)
    def run(self):
        uploadFile(self.src, self.image_name)

def uploadFile(src, image_name):
    f = open(src, "rb")            
    ftp.storbinary('STOR ' + image_name, f)
    f.close()

ftp = FTP('host')   # connect to host, default port
ftp.login()               # user anonymous, passwd anonymous@   
dirname = "/home/folder/"
i = 1   
threads = []

for image in os.listdir(dirname):
    if os.path.isfile(dirname + image):
        thread = myThread(i , dirname + image, i, image )   
        thread.start()
        threads.append( thread )        
        i += 1  

for t in threads:
    t.join()

得到一堆ftplib错误，比如

raise error_reply, resperror_reply: 200类型设置为I

如果我试着一个个上传，一切都很正常。

Answer 1

你有没有试过把连接代码放在线程里面？

换句话说，让每个线程用FTP.host()和FTP.login()做自己独立的连接。 服务器可能不喜欢在一个连接上同时进行多个上传，因为它可能一次只解析一个命令，无法处理第二个上传或 "STOR "命令。 但如果你可以从同一个IP地址进行多个连接，你就会有单独的会话在上面发出 "STOR "命令。

下面是一个例子。

    class myThread (threading.Thread):
        def __init__(self, threadID, src, counter, image_name):
             ###############
             #Add ftp connection here!
             self.ftp = FTP('host')   # connect to host, default port
             self.ftp.login()               # user anonymous, passwd anonymous@   
             ################
             self.threadID = threadID
             self.src = src
             self.counter = counter
             self.image_name = image_name
             threading.Thread.__init__(self)
        def run(self):
             uploadFile(self.src, self.image_name)

    def uploadFile(src, image_name):
          f = open(src, "rb")            
          self.ftp.storbinary('STOR ' + image_name, f)
          f.close()

     dirname = "/home/folder/"
     i = 1   
     threads = []

     for image in os.listdir(dirname):
          if os.path.isfile(dirname + image):
             thread = myThread(i , dirname + image, i, image )   
             thread.start()
             threads.append( thread )        
             i += 1  

      for t in threads:
          t.join()

看看是否会有更好的效果

P.S.不知道我所有的标签是否都对齐了。