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python - 在 pysftp 中构建连接字符串时出现不一致的错误

问题描述

我正在尝试在 SFTP 服务器上的特定目录中构建文件列表并捕获所述文件的一些属性。连接到服务器时出现不一致的问题，我一直无法找到解决方案。我说这个问题是不一致的，因为我可以运行我的 Databricks 笔记本一分钟并让它返回这个特定的错误，然后在几分钟后运行它并成功完成，并且完全没有对笔记本进行任何更改。 

from base64 import decodebytes
import paramiko
import pysftp

keydata=b"""host key here"""
key = paramiko.RSAKey(data=decodebytes(keydata))

cnopts = pysftp.CnOpts()
cnopts.hostkeys.add('123.456.7.890', 'ssh-rsa', key)

hostname = "123.456.7.890"
user = "username"
pw = "password"

with pysftp.Connection(host=hostname, username=user, password=pw, cnopts=cnopts) as sftp:
    * actions once the connection has been established *

我收到以下错误消息（当它出错时），它会将我建立 SFTP 连接的最后一行代码标记为罪魁祸首。我无法按需重现此错误。正如我所说，代码有时会完美运行，有时会返回以下错误，即使我在运行之间没有对代码进行任何更改。 

Unknown exception: from_buffer() cannot return the address of the raw string within a bytes or unicode object
Traceback (most recent call last):
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/paramiko/transport.py", line 2075, in run
    self.kex_engine.parse_next(ptype, m)
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/paramiko/kex_curve25519.py", line 64, in parse_next
    return self._parse_kexecdh_reply(m)
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/paramiko/kex_curve25519.py", line 128, in _parse_kexecdh_reply
    self.transport._verify_key(peer_host_key_bytes, sig)
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/paramiko/transport.py", line 1886, in _verify_key
    if not key.verify_ssh_sig(self.H, Message(sig)):
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/paramiko/rsakey.py", line 134, in verify_ssh_sig
    msg.get_binary(), data, padding.PKCS1v15(), hashes.SHA1()
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/cryptography/hazmat/backends/openssl/rsa.py", line 474, in verify
    self._backend, data, algorithm
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/cryptography/hazmat/backends/openssl/utils.py", line 41, in _calculate_digest_and_algorithm
    hash_ctx.update(data)
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/cryptography/hazmat/primitives/hashes.py", line 93, in update
    self._ctx.update(data)
  File "/local_disk0/pythonVirtualEnvDirs/virtualEnv-a488e5a9-de49-48a7-b684-893822004827/lib/python3.5/site-packages/cryptography/hazmat/backends/openssl/hashes.py", line 50, in update
    data_ptr = self._backend._ffi.from_buffer(data)
TypeError: from_buffer() cannot return the address of the raw string within a bytes or unicode object

标签： pythonpysparkpysftp

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