在 Python ftplib FTP 传输文件上传中处理断开连接

2022-01-09 00:00:00 python ftp ftplib

问题描述

如何处理 ftplib 中的断开连接?

How can I handle disconnects in ftplib?

我编写了一个 Python 脚本，我将使用它来使用 ftplib 将非常大的文件上传到 FTP 服务器.

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

我的问题是:由于文件的大小，上传可能会花费很多时间，如果互联网在中间断开连接然后在 1 分钟后重新连接怎么办?如何在脚本中处理此类问题?有什么想法吗?

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?

我想到的是一个 try except 块，它不断检查互联网连接是否可用.有什么想法吗?

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

谢谢

解决方案

使用 Python ftplib 上传时处理断开连接的简单实现:

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)

建议进行更细粒度的异常处理.

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