python - 扭曲的 python ISFTPServer openDirectory

Question

我一直在通过twisted 来制作一个sftp 服务器，但无法从我的ISFTPServer.openDirectory 函数返回任何信息。

EX

class MySFTPAdapter:
    implements(filetransfer.ISFTPServer)
    def openDirectory(self, path):
        return ('test', 'drwxrwxrwx    1 ab       cd              0 Apr 23 15:41 test', {'size': 0, 'uid': 1000, 'gid': 1000, 'mtime': 1366746069L, 'atime': 1366746069L, 'permissions': 511})

失败

    Traceback (most recent call last):
  File "sftpserver.py", line 435, in dataReceived
    f(data)
  File "/usr/lib/python2.6/dist-packages/twisted/conch/ssh/filetransfer.py", line 265, in packet_OPENDIR
    d.addCallback(self._cbOpenDirectory, requestId)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 260, in addCallback
    callbackKeywords=kw)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 249, in addCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 441, in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File "/usr/lib/python2.6/dist-packages/twisted/conch/ssh/filetransfer.py", line 269, in _cbOpenDirectory
    handle = str(hash(dirObj))
exceptions.TypeError: unhashable type: 'dict'

异常框架局部变量是；

{'val': ('test', 'drwxrwxrwx    1 ab       cd              0 Apr 23 15:41 test', {'size': 0, 'uid': 1000, 'gid': 1000, 'mtime': 1366746069L, 'atime': 1366746069L, 'permissions': 511})}

有人知道发生了什么或者我做错了什么吗？

Answer 1

您的openDirectory实现:

def openDirectory(self, path):
    return ('test',
            'drwxrwxrwx    1 ab       cd              0 Apr 23 15:41 test',
            {'size': 0, 'uid': 1000, 'gid': 1000, 'mtime': 1366746069L,
             'atime': 1366746069L, 'permissions': 511})

返回三个元素的元组。来自接口(interface)文档:

    This method returns an iterable object that has a close() method,                                                                      
    or a Deferred that is called back with same.                                                                                           

    The close() method is called when the client is finished reading                                                                       
    from the directory.  At this point, the iterable will no longer                                                                        
    be used.                                                                                                                               

    The iterable should return triples of the form (filename,                                                                              
    longname, attrs) or Deferreds that return the same.  The                                                                               
    sequence must support __getitem__, but otherwise may be any                                                                            
    'sequence-like' object.                                                      

您返回的元组听起来像是这里讨论的迭代器的一个元素，而不是整个返回值。

尝试如下:

def openDirectory(self, path):
    yield ('test',
           'drwxrwxrwx    1 ab       cd              0 Apr 23 15:41 test',
           {'size': 0, 'uid': 1000, 'gid': 1000, 'mtime': 1366746069L,
            'atime': 1366746069L, 'permissions': 511})

现在您有了一个生成器 - 它是一个具有 close 方法的迭代器 - 其元素是三元组，如文档中所述。