扭曲的沙井：如何访问应用程序中的服务器？

Question

我需要在运行时连接到我的 twisted 应用程序，并且我正在尝试获取 twisted.manhole 为我工作以实现这一目标。我使用的是 Mac OSX 10.6，默认安装了twisted 8.2。

使用twistd的示例服务器可以工作。启动时有关于 md5、sha 和twisted.protocols.telnet 的 DeprecationWarnings，但沙井服务器实际上做了它应该做的事情，我可以访问我的应用程序的内部：

host:client user$ telnet localhost 4040
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

twisted.manhole.telnet.ShellFactory
Twisted 8.2.0
username: admin
password: *****
>>> dir()
['_', '__builtins__', 'factory', 'service']
>>> factory
<twisted.manhole.telnet.ShellFactory instance at 0x101256440>
>>> service
<twisted.application.internet.TCPServer instance at 0x10124ff38>
>>> service.parent
<twisted.application.service.MultiService instance at 0x1014b0cf8>
>>> 

现在我尝试将其集成到我的应用程序中：

# test_manhole.tac

from twisted.application.internet import TCPServer
from twisted.application.service  import Application, IServiceCollection
from twisted.manhole.telnet       import ShellFactory

shell_factory = ShellFactory()
shell_factory.username = 'admin'
shell_factory.password = 'admin'
shell_factory.namespace['some_value'] = 42
shell_tcp_server = TCPServer(4040, shell_factory)

application = Application('test')
serviceCollection = IServiceCollection(application)

shell_tcp_server.setServiceParent(serviceCollection)

运行上面的代码在 shell 中：

host:server user$ twistd -noy test_manhole.tac
(omitting the same DeprecationWarnings about md5, sha and twisted.protocols.telnet as earlier)
2011-08-24 16:52:13+1000 [-] Log opened.
2011-08-24 16:52:13+1000 [-] twistd 8.2.0 (/usr/bin/python2.6 2.6.1) starting up.
2011-08-24 16:52:13+1000 [-] reactor class: twisted.internet.selectreactor.SelectReactor.
2011-08-24 16:52:13+1000 [-] twisted.manhole.telnet.ShellFactory starting on 4040
2011-08-24 16:52:13+1000 [-] Starting factory <twisted.manhole.telnet.ShellFactory instance at 0x1012cfdd0>
2011-08-24 16:52:13+1000 [-] start service:  <twisted.application.internet.TCPServer instance at 0x1012cff80>

在第二个 shell 中，运行 telnet 客户端：

host:client user$ telnet localhost 4040
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

twisted.manhole.telnet.ShellFactory
Twisted 8.2.0
username: admin
password: *****
>>> dir()
['_', '__builtins__', 'factory', 'service', 'some_value']
>>> factory
<twisted.manhole.telnet.ShellFactory instance at 0x1012cfdd0>
>>> service
>>> service == None
True
>>> service.parent
      ...
exceptions.AttributeError: 'NoneType' object has no attribute 'parent'
>>> some_value
42

因此，服务对象似乎无法用于访问应用程序内部。

好的，由于 twisted.protocols.telnet 无论如何似乎已被 twisted.conch.telnet 取代，请尝试使用较新的模块：

# test_manhole_2.tac

from twisted.application.service import Application, IServiceCollection
from twisted.conch.manhole_tap   import makeService

options = \
{
    # for some reason, these must
    # all exist, even if None
    'namespace'  : None,
    'passwd'     : 'users.txt',
    'sshPort'    : None,
    'telnetPort' : '4040',
}

shell_service = makeService(options)

application = Application('test')
serviceCollection = IServiceCollection(application)

shell_service.setServiceParent(serviceCollection)

“密码文件”users .txt 可能只包含一行示例用户名和密码，例如 admin:admin。

启动测试服务器：

host:server user$ twistd -noy test_manhole_2.tac
(omitting DeprecationWarnings about md5 and sha)
2011-08-24 17:44:26+1000 [-] Log opened.
2011-08-24 17:44:26+1000 [-] twistd 8.2.0 (/usr/bin/python2.6 2.6.1) starting up.
2011-08-24 17:44:26+1000 [-] reactor class: twisted.internet.selectreactor.SelectReactor.
2011-08-24 17:44:26+1000 [-] twisted.internet.protocol.ServerFactory starting on 4040
2011-08-24 17:44:26+1000 [-] Starting factory <twisted.internet.protocol.ServerFactory instance at 0x10181e710>
2011-08-24 17:44:26+1000 [-] start service:  <twisted.application.service.MultiService instance at 0x1012553b0>
2011-08-24 17:44:26+1000 [-] start service:  <twisted.application.internet.TCPServer instance at 0x10181e998>

在第二个 shell 中，运行 telnet 客户端 - 请注意，其中一些实际上是猜测，因为有问题的 Mac OSX readline（或其他任何责任）似乎吞噬了一些 shell 输出：

host:client user$ telnet localhost 4040
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Username: admin
Password: *****

>>> dir()
['__builtins__']

所以现在看来​​我已经从一个无用的 service 对象变成了根本没有对象。

如何正确使用twisted.manhole？

Answer 1

继续使用twisted.conch并将一些内容放入命名空间字典中。

namespace = {"your_application_object": some_object}

options = {
    # for some reason, these must
    # all exist, even if None
    'namespace'  : namespace,
    'passwd'     : 'users.txt',
    'sshPort'    : None,
    'telnetPort' : '4040',
}