問題描述

如何處理 ftplib 中的斷開連接?

How can I handle disconnects in ftplib?

我編寫了一個(gè) Python 腳本，我將使用它來使用 ftplib 將非常大的文件上傳到 FTP 服務(wù)器.

I wrote a Python scrip that I will use in order to upload very big files to an FTP server using ftplib.

我的問題是:由于文件的大小，上傳可能會(huì)花費(fèi)很多時(shí)間，如果互聯(lián)網(wǎng)在中間斷開連接然后在 1 分鐘后重新連接怎么辦?如何在腳本中處理此類問題?有什么想法嗎?

My question is: Seeing as upload will probably take a lot of time due to the file's size, what if the internet disconnects in the middle and then reconnects say after 1 minute? How can I handle such issue in the script? Any ideas?

我想到的是一個(gè) try except 塊，它不斷檢查互聯(lián)網(wǎng)連接是否可用.有什么想法嗎?

What I thought about is a try except block that keeps checking if internet connection is available. Any ideas?

謝謝

推薦答案

使用 Python ftplib 上傳時(shí)處理斷開連接的簡(jiǎn)單實(shí)現(xiàn):

A simple implementation for handling of disconnects while uploading with Python ftplib:

finished = False

local_path = "/local/source/path/file.zip"
remote_path = "/remote/desti/path/file.zip"

with open(local_path, 'rb') as f:
    while (not finished):
        try:
            if ftp is None:
                print("Connecting...")
                ftp = FTP(host, user, passwd)

            if f.tell() > 0:
                rest = ftp.size(remote_path)
                print(f"Resuming transfer from {rest}...")
                f.seek(rest)
            else:
                print("Starting from the beginning...")
                rest = None
            ftp.storbinary(f"STOR {remote_path}", f, rest=rest)
            print("Done")
            finished = True
        except Exception as e:
            ftp = None
            sec = 5
            print(f"Transfer failed: {e}, will retry in {sec} seconds...")
            time.sleep(sec)

建議進(jìn)行更細(xì)粒度的異常處理.

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