Max recursion depth exceeded error

[JoshOrndorff]

• rchain-grpc version:
• Python version:
• Operating System:

Description

This issue is opened for @googyduru to seek help on an issue partially described here
rchain/bounties#996 (comment)

@goodyduru Please fill in details and push the code that is causing the problem to github.

What I Did

Paste the command(s) you ran and the output.
If there was a crash, please include the traceback here.

[goodyduru]

Thanks @JoshOrndorff, I tested the code in a jupyter notebook so it's not been merged in the main project. But here is the command:
from rchain_grpc import casper

connection = casper.create_connection(host=RNODE_HOST, port=40403)
print(connection)

And here is the traceback:
1 from rchain_grpc import casper
2
----> 3 connection = casper.create_connection(host=RNODE_HOST, port=40403)
4 print(connection)

~/.local/lib/python3.6/site-packages/rchain_grpc/utils.py in create_connection(stub, channel_fn, host, port)
53
54 channel = channel_fn(f'{host}:{port}')
---> 55 return Connection[stub](channel, stub(channel))
56
57

/usr/lib/python3.6/typing.py in new(cls, *args, **kwds)
1229 raise TypeError("Type Generic cannot be instantiated; "
1230 "it can be used only as a base class")
-> 1231 return _generic_new(cls.next_in_mro, cls, *args, **kwds)
1232
1233

/usr/lib/python3.6/typing.py in _generic_new(base_cls, cls, *args, **kwds)
1195 obj = base_cls.new(origin, *args, **kwds)
1196 try:
-> 1197 obj.orig_class = cls
1198 except AttributeError:
1199 pass

~/.local/lib/python3.6/site-packages/rchain_grpc/utils.py in setattr(self, key, val)
34
35 def setattr(self, key: str, val: Any) -> None:
---> 36 if not self.connected:
37 raise ConnectionClosedException()
38 setattr(self._stub, key, val)

~/.local/lib/python3.6/site-packages/rchain_grpc/utils.py in getattr(self, key)
29
30 def getattr(self, key: str) -> Any:
---> 31 if not self.connected:
32 raise ConnectionClosedException()
33 return getattr(self._stub, key)

... last 1 frames repeated, from the frame below ...

~/.local/lib/python3.6/site-packages/rchain_grpc/utils.py in getattr(self, key)
29
30 def getattr(self, key: str) -> Any:
---> 31 if not self.connected:
32 raise ConnectionClosedException()
33 return getattr(self._stub, key)

RecursionError: maximum recursion depth exceeded.

[pdonorio]

Hello @goodyduru,
from the stacktrace errors are generated from python 3.6, is that the python version that you are using?

If that's the case it is a known problem, we noticed a week ago this issue with that version, while current unittests are running only on python 3.7.

We are in the process of supporting old versions of Python in #5, please follow that issue for updates as 3.6 is next.

---

In the meantime just for the record, if you use docker, you can get a working environment like this:

git clone https://github.com/proof-media/rchain-notebook.git
cd rchain-notebook/
docker-compose pull
docker-compose up -d
# you have a running notebook 
# but we can quickly debug with
docker-compose exec notes ipython

from rchain_grpc import casper
RNODE_HOST = %env NODE_NAME
connection = casper.create_connection(host=RNODE_HOST, port=40403)
print(connection)

<rchain_grpc.utils.Connection object at 0x7f94504ed828>

[goodyduru]

Alright, thanks. Will try docker for now.