Get folder size using FtpLib

Question

I'm using FtpLib (Python) to download a folder with files from an ftp server. But I want to know the size of the folder before I start downloading it.

In the documentation I found FTP.size(filename) but that's just for files and not for folders... I could loop through all the files in the folder but it is possible that the folder contains subfolders.

So does anyone know how to get the size of the folder using FtpLib?

I dont know if there is a ready to use python lib/module but ftp's structure doesn't allow this. It seems that u must sum file sizes under a folder within your code and u must do this recursively to get the folder size. — obayhan, Feb 28 '14 at 08:56

score 8 · Accepted Answer · answered Feb 28 '14 at 11:25

After some trial and error I found the solution.

It's based on Alex Thorntons solution but I kept in mind that there could be subfolders. When it's a folder, the ftp.cwd() command succeeds and the function is called recursively.

When the ftp.cwd() command throws an error, it was a file and we can get the file size. The type is set to "I" (images), this forces binary mode since the ftp.size() command is not allowed in ASCII mode.

def get_total_size(self, directory):
    size = 0
    for filename in self.ftp.nlst(directory):
        try:
            self.ftp.cwd(filename)
            size += self.get_total_size(filename)
        except:
            self.ftp.voidcmd('TYPE I')
            size += self.ftp.size(filename)
    return size

I think the self is unnecessary in this script! – multigoodverse Mar 22 '15 at 08:18 — multigoodverse, Mar 22 '15 at 08:18

score 2 · Answer 2 · answered Feb 28 '14 at 09:24

2

def get_size(directory):
    size = 0
    for file in FTP.nlst(directory):
        size += FTP.size(file)
    return size

answered Feb 28 '14 at 09:24

anon582847382

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I get `ftplib.error_perm: 550 SIZE not allowed in ASCII mode` – Frederik Voordeckers Feb 28 '14 at 10:38
To avoid complications, I would point you towards @FrederikVoordeckers 's solution. – anon582847382 Feb 28 '14 at 17:59
2

@FrederikVoordeckers - got the same error, added `ftp.voidcmd('TYPE I')` just before ftp.size(file) and it worked - but only for files of course, not folders – Greg Zaal Apr 19 '14 at 12:33
@GregZaal: you might want to take a look at the accepted answer ;) – Frederik Voordeckers Apr 20 '14 at 15:41

St4rb0y · Answer 3 · 2016-07-23T16:03:09.043

Frederik Voordeckers' solution didn't work for me. When the method is called recursively, when dealing with a structure of subfolders, it raises the error 550 directory/.../sub_directory: No such file or directory.
I did modify his original code, by deleting the "self-declarations", since I did not use the method inside a class. This might have caused the error. I don't know.

Here is my solution:

def get_total_size(ftp_dir):
    size = 0
    parent_dir = ftp.pwd() # get the current directory
    for filename in ftp.nlst(ftp_dir):
        # (don't forget to import os)
        path = os.path.join(parent_dir, filename) # keeps recursively track of the path
        try:
            ftp.cwd(path)
            size += get_total_size(path)
            ftp.cwd(parent_dir)
        except:
            ftp.voidcmd('TYPE I')
            size += ftp.size(path)
    return size

Should work like a charm for everyone.

Get folder size using FtpLib

3 Answers3

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