inspect.isfunction(rpyc_remote_function)

[talsaiag]

While upgrading from 4.1.2 to 5.0.0 we had issues with objects returned over rpyc.

Commit b683c25 broke this next snippet:

import inspect
inspect.ismethod(rpyc_remote_function)  # where rpyc_remote_function is an netref pointing to a function
# returns True before commit b683c25 but False after

Same for all inspect.is* checks (eg. ismodule, ismethod, iscode, isclass...).

Environment

• rpyc version: 4.1.3, 5.0.0
• python version: Python3.8
• operating system: linux & macos

Minimal example

Server:

import rpyc
from rpyc.utils.server import OneShotServer

def func():
    pass

class HelloService(rpyc.Service):
    def exposed_example(self):
        return func


if __name__ == "__main__":
    rpyc.lib.setup_logger()
    server = OneShotServer(HelloService, port=12345)
    server.start()

Client:

import rpyc
import inspect

c = rpyc.connect("localhost", 12345)
func = c.root.example()
print(inspect.isfunction(func))  # Should print(True)

[comrumino]

This should be fixed by #427 ... If by chance it is not fixed, please reopen.

[sergeyyatmellanox]

Running this example on rpyc 5.0.0 and python 3.8:

INFO:HELLO/12345:accepted ('127.0.0.1', 45934) with fd 4
INFO:HELLO/12345:welcome ('127.0.0.1', 45934)
DEBUG:HELLO/12345:Exception caught
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 324, in _dispatch_request
res = self._HANDLERS[handler](self, *args)
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 608, in _handle_getattr
return self._access_attr(obj, name, (), "_rpyc_getattr", "allow_getattr", getattr)
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 535, in _access_attr
name = self._check_attr(obj, name, param)
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 525, in _check_attr
raise AttributeError("cannot access %r" % (name,))
AttributeError: cannot access 'class'
DEBUG:HELLO/12345:Exception caught
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 324, in _dispatch_request
res = self._HANDLERS[handler](self, *args)
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 608, in _handle_getattr
return self._access_attr(obj, name, (), "_rpyc_getattr", "allow_getattr", getattr)
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 535, in _access_attr
name = self._check_attr(obj, name, param)
File "/usr/local/lib/python3.8/site-packages/rpyc/core/protocol.py", line 525, in _check_attr
raise AttributeError("cannot access %r" % (name,))
AttributeError: cannot access 'class'
False
INFO:HELLO/12345:goodbye ('127.0.0.1', 45934)
INFO:HELLO/12345:listener closed
INFO:HELLO/12345:server has terminated

The inspect.isfunction doesn't work anymore, again.
The same goes for inspect.ismethod.