我正在编写一个应用程序,我正在编写通过SSH下载和上传文件到其他框的文件。我遇到的问题是我可以获得(下载)文件,但是当我尝试将它们(上传)到另一台服务器上时,我得到一个EOFError()异常。当我在paramiko \ sftp.py中查看_write_all()时,似乎错误是在它无法向流中写入任何数据时引起的?我没有网络编程经验,所以如果有人知道它正在尝试做什么,并且能够与我沟通,我会很感激。
我写了一个简化版本的函数来处理我的连接为ssh()。 runCommand()显示了我的应用程序中的上传失败,而simpleTest()显示了sftp put是如何工作的,但除了我的SFTP对象的存储方式之外,我看不出runCommand()和simpleTest()之间的任何区别。一个存储在字典中,另一个存储在字典中。似乎字典是下载文件不起作用的问题,但事实并非如此。
有没有人知道可能导致此行为的原因,或者如果这种方式导致问题,可以推荐另一种方法来管理我的连接?
我正在使用带有Paramiko 1.7.6的Python 2.7。我已经在Linux和Windows上测试了这段代码并得到了相同的结果。
编辑:现在包含的代码。
import os
import paramiko
class ManageSSH:
"""Manages ssh connections."""
def __init__(self):
self.hosts = {"testbox": ['testbox', 'test', 'test']}
self.sshConnections = {}
self.sftpConnections = {}
self.localfile = "C:\\testfile"
self.remotefile = "/tmp/tempfile"
self.fetchedfile = "C:\\tempdl"
def ssh(self):
"""Manages ssh connections."""
for host in self.hosts.keys():
try:
self.sshConnections[host]
print "ssh connection is already open for %s" % host
except KeyError, e: # if no ssh connection for the host exists then open one
# open ssh connection
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(self.hosts[host][0], 22, self.hosts[host][1], self.hosts[host][2])
self.sshConnections[host] = ssh
print "ssh connection to %s opened" % host
try:
self.sftpConnections[host]
print "sftp connection is already open for %s" % host
except KeyError, e:
# open sftp connection
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(self.hosts[host][0], 22, self.hosts[host][1], self.hosts[host][2])
self.sftpConnections[host] = ssh.open_sftp()
print "sftp connection to %s opened" % host
def runCommand(self):
"""run commands and return output"""
for host in self.hosts:
command = "if [ -d /tmp ]; then echo -n 1; else echo -n 0; fi"
stdin, stdout, stderr = self.sshConnections[host].exec_command(command)
print "%s executed on %s" % (command, host)
print "returned %s" % stdout.read()
self.sftpConnections.get(self.remotefile, self.fetchedfile)
print "downloaded %s from %s" % (self.remotefile, host)
self.sftpConnections[host].put(self.localfile, self.remotefile)
print "uploaded %s to %s" % (self.localfile, host)
self.sftpConnections[host].close()
self.sshConnections[host].close()
def simpleTest(self):
host = "testbox"
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(host, 22, 'test', 'test')
sftp = ssh.open_sftp()
print "sftp connection to %s opened" % host
sftp.get(self.remotefile, self.fetchedfile)
print "downloaded %s from %s" % (self.localfile, host)
sftp.put(self.localfile, self.remotefile)
print "uploaded %s to %s" % (self.localfile, host)
sftp.close()
if __name__ == "__main__":
test = ManageSSH()
print "running test that works"
test.simpleTest()
print "running test that fails"
test.ssh()
test.runCommand()
输出:
running test that works
sftp connection to testbox opened
downloaded C:\testfile from testbox
uploaded C:\testfile to testbox
running test that fails
ssh connection to testbox opened
sftp connection to testbox opened
if [ -d /tmp ]; then echo -n 1; else echo -n 0; fi executed on testbox
returned 1
downloaded /tmp/tempfile from testbox
Traceback (most recent call last):
File "paramikotest.py", line 71, in <module>
test.runCommand()
File "paramikotest.py", line 47, in runCommand
self.sftpConnections[host].put(self.localfile, self.remotefile)
File "C:\Python27\lib\site-packages\paramiko\sftp_client.py", line 561, in put
fr = self.file(remotepath, 'wb')
File "C:\Python27\lib\site-packages\paramiko\sftp_client.py", line 245, in open
t, msg = self._request(CMD_OPEN, filename, imode, attrblock)
File "C:\Python27\lib\site-packages\paramiko\sftp_client.py", line 627, in _request
num = self._async_request(type(None), t, *arg)
File "C:\Python27\lib\site-packages\paramiko\sftp_client.py", line 649, in _async_request
self._send_packet(t, str(msg))
File "C:\Python27\lib\site-packages\paramiko\sftp.py", line 172, in _send_packet
self._write_all(out)
File "C:\Python27\lib\site-packages\paramiko\sftp.py", line 138, in _write_all
raise EOFError()
EOFError
答案 0 :(得分:7)
我能够解决我的问题。我原本应该使用Paramiko.Transport,然后使用SFTPClient
创建paramiko.SFTPClient.from_transport(t)
,而不是使用open_sftp()
中的SSHClient()
。
以下代码有效:
t = paramiko.Transport((host, 22))
t.connect(username=username, password=password)
sftp = paramiko.SFTPClient.from_transport(t)
答案 1 :(得分:2)
我认为,使用ssh = SSHClient()创建一个SSHClient-Object,然后使用sftp = ssh.open_sftp()创建一个sftp-object。虽然你只想使用sftp,你将ssh存储在一个局部变量中,然后获取gc'd,但是,如果ssh是gc'd,则sftp会神奇地停止工作。不知道为什么,但试着把你的sftp存在的时间存储起来。
答案 2 :(得分:0)
阅读完编辑后,我认为问题就在这里
stdin, stdout, stderr = self.sshConnections[host].exec_command(command)
这条线显然断开了ftp的事情
<强> EDITED 强>