Windows fatal access exception

[RedUndercover]

I am trying to test some of my rego code in pytest using regopy and keep running into errors:

This is my pytest code:

from regopy import Interpreter
import pytest
import os
import pathlib


def test_rego():
    # Load rego policy
    rego_policy = r"test.rego"
    rego_input = r"ec2_data.json"
    current_dir = pathlib.Path(os.path.abspath(__file__)).parent

    rego_policy = os.path.join(current_dir, rego_policy)
    rego_input = os.path.join(current_dir, rego_input)
    
    with open(rego_policy) as f:
        policy = f.read()

    # Load rego input
    with open(rego_input) as f:
        input_data = f.read()

    # Create rego object
    rego = Interpreter()

    rego.add_module("aws.cost.idle_instances", policy)
    rego.set_input(input_data)
    result = rego.query("data.aws.cost.idle_instances.details")
    assert result is not None

But upon execution of pytest, i get this error:

Windows fatal exception: access violation

Current thread 0x000066e4 (most recent call first):
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\regopy\interpreter.py", line 110 in __init__
  File "c:\Users\Tyler\dev\OpsBox\modules\rego_checks\ec2_checks\idle_instances\test_idle_instances.py", line 25 in test_rego
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\python.py", line 159 in pytest_pyfunc_call
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_callers.py", line 103 in _multicall
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_hooks.py", line 513 in __call__
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\python.py", line 1627 in runtest
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\runner.py", line 174 in pytest_runtest_call
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_callers.py", line 103 in _multicall
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_hooks.py", line 513 in __call__
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\runner.py", line 242 in <lambda>
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\runner.py", line 341 in from_call
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\runner.py", line 241 in call_and_report
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\runner.py", line 132 in runtestprotocol
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\runner.py", line 113 in pytest_runtest_protocol
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_callers.py", line 103 in _multicall
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_hooks.py", line 513 in __call__
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\main.py", line 362 in pytest_runtestloop
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_callers.py", line 103 in _multicall
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_hooks.py", line 513 in __call__
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\main.py", line 337 in _main
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\main.py", line 283 in wrap_session
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\main.py", line 330 in pytest_cmdline_main
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_callers.py", line 103 in _multicall
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\pluggy\_hooks.py", line 513 in __call__
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\config\__init__.py", line 175 in main
  File "C:\Users\Tyler\dev\OpsBox\.venv\Lib\site-packages\_pytest\config\__init__.py", line 201 in console_main
  File "C:\Users\Tyler\dev\OpsBox\.venv\Scripts\pytest.exe\__main__.py", line 8 in <module>
  File "<frozen runpy>", line 88 in _run_code
  File "<frozen runpy>", line 198 in _run_module_as_main

and when running with vscode:
The python test process was terminated before it could exit on its own, the process errored with: Code: 3221225477, Signal: null
This rego code has been confirmed to be working perfectly well in an ordinary OPA server environment.

Here is a modified version of our code:, with one less list argument:

package aws.cost.idle_instances

default allow = false

allow {
    a := input.instances[_]
    a.state == "running"
}

details := [a | a := input.instances[_]; a.state == "running"]

I am on python 3.11 on windows running version 0.4.5 of regopy.

[matajoh]

Thanks for the bug report! I will see if I can repro this issue and then investigate. As I use pytest for my own tests, this is unexpected!