Python pysftp.put raises “No such file” exception although file is uploaded

问题

I am using pysftp to connect to a server and upload a file to it.

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None
self.sftp = pysftp.Connection(host=self.serverConnectionAuth['host'], port=self.serverConnectionAuth['port'],
                              username=self.serverConnectionAuth['username'], password=self.serverConnectionAuth['password'], 
                              cnopts=cnopts)
self.sftp.put(localpath=self.filepath+filename, remotepath=filename)

Sometimes it does okay with no error, but sometime it puts the file correctly, BUT raises the following exception. The file is read and processed by another program running on the server, so I can see that the file is there and it is not corrupted

  File "E:\Anaconda\envs\py35\lib\site-packages\pysftp\__init__.py", line 364, in put
    confirm=confirm)
  File "E:\Anaconda\envs\py35\lib\site-packages\paramiko\sftp_client.py", line 727, in put
    return self.putfo(fl, remotepath, file_size, callback, confirm)
  File "E:\Anaconda\envs\py35\lib\site-packages\paramiko\sftp_client.py", line 689, in putfo
    s = self.stat(remotepath)
  File "E:\Anaconda\envs\py35\lib\site-packages\paramiko\sftp_client.py", line 460, in stat
    t, msg = self._request(CMD_STAT, path)
  File "E:\Anaconda\envs\py35\lib\site-packages\paramiko\sftp_client.py", line 780, in _request
    return self._read_response(num)
  File "E:\Anaconda\envs\py35\lib\site-packages\paramiko\sftp_client.py", line 832, in _read_response
    self._convert_status(msg)
  File "E:\Anaconda\envs\py35\lib\site-packages\paramiko\sftp_client.py", line 861, in _convert_status
    raise IOError(errno.ENOENT, text)
FileNotFoundError: [Errno 2] No such file

How can I prevent the exception?

回答1:

From your comment, I assume that the file is removed very shortly after it is uploaded by some server-side process.

By default pysftp.Connection.put verifies the upload by checking a size of the target file. If the server-side processes manages to remove the file too fast, reading the file size would fail.

You can disable the post-upload check by setting confirm parameter to False:

self.sftp.put(localpath=self.filepath+filename, remotepath=filename, confirm=False)

I believe the check is redundant anyway, see
How to perform checksums during a SFTP file transfer for data integrity?

For a similar question about Paramiko (which pysftp uses internally), see:
Paramiko put method throws "[Errno 2] File not found" if FTP server has trigger to automatically move file upon upload

来源：https://stackoverflow.com/questions/49718668/python-pysftp-put-raises-no-such-file-exception-although-file-is-uploaded

标签

python

sftp

pysftp