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from __future__ import annotations
from contextlib import contextmanager
from inspect import isasyncgenfunction, iscoroutinefunction
from typing import Any, Dict, Generator, Tuple, cast
import pytest
import sniffio
from ._core._eventloop import get_all_backends, get_asynclib
from .abc import TestRunner
_current_runner: TestRunner | None = None
def extract_backend_and_options(backend: object) -> tuple[str, dict[str, Any]]:
if isinstance(backend, str):
return backend, {}
elif isinstance(backend, tuple) and len(backend) == 2:
if isinstance(backend[0], str) and isinstance(backend[1], dict):
return cast(Tuple[str, Dict[str, Any]], backend)
raise TypeError("anyio_backend must be either a string or tuple of (string, dict)")
@contextmanager
def get_runner(
backend_name: str, backend_options: dict[str, Any]
) -> Generator[TestRunner, object, None]:
global _current_runner
if _current_runner:
yield _current_runner
return
asynclib = get_asynclib(backend_name)
token = None
if sniffio.current_async_library_cvar.get(None) is None:
# Since we're in control of the event loop, we can cache the name of the async library
token = sniffio.current_async_library_cvar.set(backend_name)
try:
backend_options = backend_options or {}
with asynclib.TestRunner(**backend_options) as runner:
_current_runner = runner
yield runner
finally:
_current_runner = None
if token:
sniffio.current_async_library_cvar.reset(token)
def pytest_configure(config: Any) -> None:
config.addinivalue_line(
"markers",
"anyio: mark the (coroutine function) test to be run "
"asynchronously via anyio.",
)
def pytest_fixture_setup(fixturedef: Any, request: Any) -> None:
def wrapper(*args, anyio_backend, **kwargs): # type: ignore[no-untyped-def]
backend_name, backend_options = extract_backend_and_options(anyio_backend)
if has_backend_arg:
kwargs["anyio_backend"] = anyio_backend
with get_runner(backend_name, backend_options) as runner:
if isasyncgenfunction(func):
yield from runner.run_asyncgen_fixture(func, kwargs)
else:
yield runner.run_fixture(func, kwargs)
# Only apply this to coroutine functions and async generator functions in requests that involve
# the anyio_backend fixture
func = fixturedef.func
if isasyncgenfunction(func) or iscoroutinefunction(func):
if "anyio_backend" in request.fixturenames:
has_backend_arg = "anyio_backend" in fixturedef.argnames
fixturedef.func = wrapper
if not has_backend_arg:
fixturedef.argnames += ("anyio_backend",)
@pytest.hookimpl(tryfirst=True)
def pytest_pycollect_makeitem(collector: Any, name: Any, obj: Any) -> None:
if collector.istestfunction(obj, name):
inner_func = obj.hypothesis.inner_test if hasattr(obj, "hypothesis") else obj
if iscoroutinefunction(inner_func):
marker = collector.get_closest_marker("anyio")
own_markers = getattr(obj, "pytestmark", ())
if marker or any(marker.name == "anyio" for marker in own_markers):
pytest.mark.usefixtures("anyio_backend")(obj)
@pytest.hookimpl(tryfirst=True)
def pytest_pyfunc_call(pyfuncitem: Any) -> bool | None:
def run_with_hypothesis(**kwargs: Any) -> None:
with get_runner(backend_name, backend_options) as runner:
runner.run_test(original_func, kwargs)
backend = pyfuncitem.funcargs.get("anyio_backend")
if backend:
backend_name, backend_options = extract_backend_and_options(backend)
if hasattr(pyfuncitem.obj, "hypothesis"):
# Wrap the inner test function unless it's already wrapped
original_func = pyfuncitem.obj.hypothesis.inner_test
if original_func.__qualname__ != run_with_hypothesis.__qualname__:
if iscoroutinefunction(original_func):
pyfuncitem.obj.hypothesis.inner_test = run_with_hypothesis
return None
if iscoroutinefunction(pyfuncitem.obj):
funcargs = pyfuncitem.funcargs
testargs = {arg: funcargs[arg] for arg in pyfuncitem._fixtureinfo.argnames}
with get_runner(backend_name, backend_options) as runner:
runner.run_test(pyfuncitem.obj, testargs)
return True
return None
@pytest.fixture(params=get_all_backends())
def anyio_backend(request: Any) -> Any:
return request.param
@pytest.fixture
def anyio_backend_name(anyio_backend: Any) -> str:
if isinstance(anyio_backend, str):
return anyio_backend
else:
return anyio_backend[0]
@pytest.fixture
def anyio_backend_options(anyio_backend: Any) -> dict[str, Any]:
if isinstance(anyio_backend, str):
return {}
else:
return anyio_backend[1]
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