使用Paramiko连接SFTP时出现了“Oops，未处理的类型3（'未实现'）”错误。

Question

我在尝试让下面的脚本生效，从而读取位于远程服务器(server 1)中一个特定目录下的CSV文件列表，并将数据传输到另一个服务器中的PostgreSQL数据库。

我已创建一个RSA SSH密钥并将其复制到远程服务器，现在我只能使用用户名连接到服务器。

我已尝试将RSA Pub密钥/私钥复制到文件夹中（当我运行PY脚本时，.ssh文件夹无法接受），并提供了其位置，甚至尝试粘贴整个私钥，但不起作用，会引发以下异常。

我在这一行"sftp = t.open_sftp_client()"遇到错误，但错误信息没有任何有用的提示。

请问有谁能帮忙解决？建议将非常有帮助。

异常：

    Database connected
SFTP Connected
Oops, unhandled type 3 ('unimplemented')
Traceback (most recent call last):
  File "/Users/sandeep/Documents/paramiko test.py", line 45, in <module>
    sftp = paramiko.SFTPClient.from_transport(t)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/sftp_client.py", line 165, in from_transport
    window_size=window_size, max_packet_size=max_packet_size
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/transport.py", line 879, in open_session
    timeout=timeout,
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/transport.py", line 1006, in open_channel
    raise e
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/transport.py", line 2055, in run
    ptype, m = self.packetizer.read_message()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/packet.py", line 459, in read_message
    header = self.read_all(self.__block_size_in, check_rekey=True)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/paramiko/packet.py", line 303, in read_all
    raise EOFError()
EOFError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/sandeep/Documents/paramiko test.py", line 50, in <module>
    self._logger.error(msg)

代码：

import paramiko
import psycopg2
import psycopg2.extras
import os
import inspect
import re
import sys

SECTION_SRC_STAR = "DEFAULT"

SSH_HOST = '*****.com'
SSH_USERNAME = 'root'
#SSH_KEYFILE = os.path.realpath(os.path.abspath(os.path.join(os.path.split(inspect.getfile(inspect.currentframe()))[0], "ssh.key")))
#SSH_KEYFILE = os.path.realpath(os.path.abspath(os.path.join(os.path.split(inspect.getfile(inspect.currentframe()))[0], "id_rsa")))
SSH_KEYFILE ="/Users/sand/Documents/ssh_pub"

SSH_DIR = '/opt/prod_odoo_out/carrierfiles/dhl/'
SSH_PORT = 22
SSH_MASK = 'file_pattern.*\.csv'

DSN = "dbname='postgres' user='postgres' host='localhost' password='postgres' port='5432'"
TABLE_NAME = 'staging.dhl_tracking_details'


conn = psycopg2.connect(DSN)
print("Database connected")
conn.set_client_encoding('latin-1')
cur = conn.cursor()

ssh = paramiko.SSHClient()
t = paramiko.Transport((SSH_HOST, SSH_PORT))


#key = paramiko.RSAKey.from_private_key_file(SSH_KEYFILE)
#key='***************...........'
#t.connect(username=SSH_USERNAME, pkey=key)
t.connect(username=SSH_USERNAME)
print("SFTP Connected")
try:
    #sftp = paramiko.SFTPClient.from_transport(t) 
    sftp = t.open_sftp_client()
    print("SFTP Client : Open")
except Exception as e:
    msg = "Error connecting via ssh: %s" % e
    self._logger.error(msg)
    raise paramiko.SSHException(msg)


for filename in sftp.listdir(SSH_DIR):
    if re.match(SSH_MASK, filename):
        path = '/%s/%s' % (SSH_DIR, filename)
        fobj = sftp.file(path, 'rb')
        #cur.execute('TRUNCATE TABLE %s' % TABLE_NAME)
        #fobj2 = RowsIO(fobj)
        #cur.copy_expert("COPY %s FROM STDOUT WITH DELIMITER ';' NULL 'null' CSV HEADER" % (TABLE_NAME, ), fobj2)
        sql = "COPY %s FROM STDIN WITH DELIMITER AS ';'  csv header"
        table = 'staging.dhl_tracking_details'
        cur.copy_expert(sql=sql % table, file=fobj)
        conn.commit()
        sftp.remove(path)

t.close()

- Sandeep

---

@Thomas 异常发生在身份验证之后，因此它与私钥无关。 - Martin Prikryl

@Sandeep 你能用任何（GUI/命令行）SFTP客户端连接到那个服务器吗？+ 你能发布Paramiko日志文件吗？ - Martin Prikryl

@MartinPrikryl 是的，我的错。我不知何故错过了t.connect这一行。看起来它正在使用SSH代理，认证有效。 - Thomas

Answer 1

我提到了带有Pkey属性的RSA密钥，问题已得到解决。

pk=paramiko.RSAKey.from_private_key(open('/Users/sandeep/Documents/ssh_pub/id_rsa'))
t.connect(username=SSH_USERNAME,pkey=pk)

- Sandeep