Question

我有一个类似于下面的远程服务器已经有一个初始化的类，我已经设置了协议配置为允许公共attrs True。

import rpyc

class SharedClass(object):
    def __init__(self,string):
        print string

    def action(self):
        print 'i am doing something'

s=SharedClass('hi')

class MyService(rpyc.Service):
    def on_connect(self):
        pass

    def on_disconnect(self):
        pass

    def exposed_get_shared(self):
        return s

if __name__=='__main__:
    from rpyc.utils.server import ThreadedServer
    t=ThreadedServer(MyService,port=18861,protocol_config={"allow_public_attrs":True})
    t.start()

在客户端，如果我尝试直接连接它正在工作，而当我尝试在函数内部建立连接并返回对象时我收到了错误

** **客户端

**直接连接**

>>>Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win32
>>>Type "help", "copyright", "credits" or "license" for more information.
>>>conn=rpyc.connect('localhost',18861)
>>>share=getattr(conn.root,'get_shared')
>>>share
<bound method MyService.exposed_get_shared of <__main__.MyService
object at 0x011BA698>>
>>>share=getattr(conn.root,'get_shared')()
>>>share
<__main__.SharedClass object at 0x00B6ED30>
>>>share.action()
i am doing something

如果我尝试在函数中执行此操作，则会出现错误;（

>>>def returnObject(objName, host, port):
...    conn = rpyc.connect(host, port)
...    print conn
...    attr = getattr(conn.root, 'get_' + objName)()
...    print attr
...    return attr
>>>share=returnObject('shared','localhost',18861)
<rpyc.core.protocol.Connection 'conn2' object at 0x0108AAD0>
<__main__.SharedClass object at 0x00B6ED30>
>>>share
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Python27\lib\site-packages\rpyc\core\netref.py", line 168,
in __repr__
   return syncreq(self, consts.HANDLE_REPR)
 File "C:\Python27\lib\site-packages\rpyc\core\netref.py", line 69,
in syncreq
   return conn().sync_request(handler, oid, *args)
AttributeError: 'NoneType' object has no attribute 'sync_request'

我的目的是在服务器中初始化一个对象，并让许多客户端访问它。初始化的类是线程安全的，因此多个客户端可以使用它。

我意识到我在做这件事时错过了一些东西。

-

Adhithya

Answer 1

虽然我没有rpyc的实际经验，但是从你的例子看来，唯一真正的区别是当执行returnObject函数时'conn'引用没有被保留，所以我猜这种情况与垃圾收集无关由'conn'引用。稍微修改一下returnObject函数，以便返回'conn'并保留在函数外部，示例似乎就会执行。

>>> import rpyc
>>> def returnObject(objName, host, port):
...     conn = rpyc.connect(host, port)
...     print conn
...     attr = getattr(conn.root, 'get_' + objName)()
...     print attr
...     return conn, attr
... 
>>> conn, share = returnObject('shared', 'localhost', 18861)
<rpyc.core.protocol.Connection 'conn1' object at 0x10b0676d0>
<__main__.SharedClass object at 0x1091ff790>
>>> share
<__main__.SharedClass object at 0x1091ff790>
>>> share.action()

由于我参与了另一个python远程对象解决方案Versile Python的开发，这里只是为了好玩是使用该解决方案的替代实现（需要VPy dev版本0.7.2，下一版本将有一些冲突的API更改）。提供SharedClass访问的远程服务：

from versile.quick import *
from versile.vse.native.python import VPythonObject
VSEResolver.add_imports()

class SharedClass(object):
    def action(self):
        return u'I am doing something'

shared = SharedClass()

class Gateway(VExternal):
    @publish(show=True, ctx=False)
    def get_shared(self):
        return VPythonObject(shared)

service = VTPService(lambda: Gateway(), auth=None)
service.start()

访问服务的客户端代码：

>>> from versile.quick import *
>>> VSEResolver.add_imports()
>>> gw = VUrl.resolve('vtp://localhost/')
>>> shared = gw.get_shared()
>>> shared._v_activate() # required for activating as remote-python proxy
>>> shared.action()
u'I am doing something'
>>> gw._v_link.shutdown()

在rpyc中返回远程对象

1 个答案: