Getting psutil.AccessDenied error on each and every run

[fedor-ivn]

Environment information

• brownie Version: 1.13.4
• ganache-cli Version: latest (runs in docker container with standard parameters)
• solc Version: doesn't really matter
• Python Version: 3.9
• OS: osx (Catalina)

What was wrong?

I'm getting this error on each and every run of any brownie command. I've googled it, but haven't found any solutions. I suppose it's a trouble of MacOS, but I am not sure.

I am running brownie only with sudo know, but this approach has some limitations and cannot be considered as a solution.

Brownie v1.13.4 - Python development framework for Ethereum

ContractsProject is the active project.
  File "brownie/_cli/__main__.py", line 64, in main
    importlib.import_module(f"brownie._cli.{cmd}").main()
  File "brownie/_cli/run.py", line 43, in main
    network.connect(CONFIG.argv["network"])
  File "brownie/network/main.py", line 48, in connect
    rpc.attach(host)
  File "brownie/network/rpc.py", line 156, in attach
    pid = _find_rpc_process_pid(resolved_addr)
  File "brownie/network/rpc.py", line 264, in _find_rpc_process_pid
    i for i in psutil.net_connections(kind="tcp") if _check_net_connections(i, laddr)
  File "psutil/__init__.py", line 2153, in net_connections
    return _psplatform.net_connections(kind)
  File "psutil/_psosx.py", line 249, in net_connections
    cons = Process(pid).connections(kind)
  File "psutil/_psosx.py", line 351, in wrapper
    raise AccessDenied(self.pid, self._name)
AccessDenied: psutil.AccessDenied (pid=43460)

How can it be fixed?

I would like to know :) I've checked the issues, but haven't found any corresponding.
Maybe someone faced the same problem?

[iamdefinitelyahuman]

Related to #972 - seems there's an issue with using psutil.net_connections on OSX. Not sure immediately what the solution is.

[mariuspod]

hey, just looked into the docs and found this: giampaolo/psutil#1219

It seems on OSX privileged connections can't be queried atm.
The author of psutil says lsof on OSX does the same :-/

Maybe it's possible to try-catch around it and if we're lucky the pid of the docker container runs in unprivileged scope.
The known workaround is to run:

sudo brownie

I'll try to find a test OSX machine 😅

[mariuspod]

@iamdefinitelyahuman
here's a draft PR fixing the issue on OSX: #995
Need to make it a bit more clean and try to add some tests. 😅

Basically, the actual docker process can be queried for connections. The exception occurs only while other privileged processes are queried which have nothing to do with the dockerized ganache.

[iamdefinitelyahuman]

Awesome, thank you for solving this!

[fedor-ivn]

Hey there! Thanks for paying attention to my problem, I appreciate that.

I've updated eth-brownie package through pip, but unfortunately, I still have the same problem.

Here's the traceback:

  File "brownie/_cli/__main__.py", line 64, in main
    importlib.import_module(f"brownie._cli.{cmd}").main()
  File "brownie/_cli/run.py", line 43, in main
    network.connect(CONFIG.argv["network"])
  File "brownie/network/main.py", line 48, in connect
    rpc.attach(host)
  File "brownie/network/rpc/__init__.py", line 114, in attach
    pid = _find_rpc_process_pid(resolved_addr)
  File "brownie/network/rpc/__init__.py", line 195, in _find_rpc_process_pid
    i for i in psutil.net_connections(kind="tcp") if _check_net_connections(i, laddr)
  File "psutil/__init__.py", line 2153, in net_connections
    return _psplatform.net_connections(kind)
  File "psutil/_psosx.py", line 249, in net_connections
    cons = Process(pid).connections(kind)
  File "psutil/_psosx.py", line 351, in wrapper
    raise AccessDenied(self.pid, self._name)
AccessDenied: psutil.AccessDenied (pid=93950)

[iamdefinitelyahuman]

Unless you install directly from master here on github, the fix isn't available just yet. Once #1006 merges, hopefully will be a different story :)

[fedor-ivn]

Oh, sure, thanks. I'll be waiting :)

[mariuspod]

@fedor-ivn
if you want to test the fix and install master branch of brownie via pip you can try:

pip3 install git+https://github.com/eth-brownie/brownie