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import gc
import re
from functools import partial
from typing import Any
from unittest.mock import Mock
from weakref import ref
import pytest
from psygnal import SignalInstance
from psygnal._weak_callback import WeakCallback, weak_callback
@pytest.mark.parametrize(
"type_",
[
"function",
"toolz_function",
"weak_func",
"lambda",
"method",
"partial_method",
"toolz_method",
"setattr",
"setitem",
"mock",
"weak_cb",
"print",
],
)
def test_slot_types(type_: str, capsys: Any) -> None:
mock = Mock()
final_mock = Mock()
class MyObj:
def method(self, x: int) -> None:
mock(x)
return x
def __setitem__(self, key, value):
mock(value)
return value
def __setattr__(self, __name: str, __value) -> None:
if __name == "x":
mock(__value)
return __value
obj = MyObj()
if type_ == "setattr":
cb = weak_callback(setattr, obj, "x", finalize=final_mock)
elif type_ == "setitem":
cb = weak_callback(obj.__setitem__, "x", finalize=final_mock)
elif type_ in {"function", "weak_func"}:
def obj(x: int) -> None:
mock(x)
return x
cb = weak_callback(obj, strong_func=(type_ == "function"), finalize=final_mock)
elif type_ == "toolz_function":
toolz = pytest.importorskip("toolz")
@toolz.curry
def obj(z: int, x: int) -> None:
mock(x)
return x
cb = weak_callback(obj(5), finalize=final_mock)
elif type_ == "lambda":
cb = weak_callback(lambda x: mock(x) and x, finalize=final_mock)
elif type_ == "method":
cb = weak_callback(obj.method, finalize=final_mock)
elif type_ == "partial_method":
cb = weak_callback(partial(obj.method, 2), max_args=0, finalize=final_mock)
elif type_ == "toolz_method":
toolz = pytest.importorskip("toolz")
cb = weak_callback(toolz.curry(obj.method, 2), max_args=0, finalize=final_mock)
elif type_ == "mock":
cb = weak_callback(mock, finalize=final_mock)
elif type_ == "weak_cb":
cb = weak_callback(obj.method, finalize=final_mock)
cb = weak_callback(cb, finalize=final_mock)
elif type_ == "print":
cb = weak_callback(print, finalize=final_mock)
assert isinstance(cb, WeakCallback)
assert isinstance(cb.slot_repr(), str)
cb.cb((2,))
assert cb.dereference() is not None
if type_ == "print":
assert capsys.readouterr().out == "2\n"
return
mock.assert_called_once_with(2)
mock.reset_mock()
result = cb(2)
if type_ not in ("setattr", "mock"):
assert result == 2
mock.assert_called_once_with(2)
del obj
if type_ not in ("function", "toolz_function", "lambda", "mock"):
final_mock.assert_called_once_with(cb)
assert cb.dereference() is None
with pytest.raises(ReferenceError):
cb.cb((2,))
with pytest.raises(ReferenceError):
cb(2)
else:
cb.cb((4,))
mock.assert_called_with(4)
def test_weak_callable_equality() -> None:
"""Slot callers should be equal only if they represent the same bound-method."""
class T:
def x(self): ...
t1 = T()
t2 = T()
t1_ref = ref(t1)
t2_ref = ref(t2)
bmt1_a = weak_callback(t1.x)
bmt1_b = weak_callback(t1.x)
bmt2_a = weak_callback(t2.x)
bmt2_b = weak_callback(t2.x)
assert bmt1_a != "not a weak callback"
def _assert_equality() -> None:
assert bmt1_a == bmt1_b
assert bmt2_a == bmt2_b
assert bmt1_a != bmt2_a
assert bmt1_b != bmt2_b
_assert_equality()
del t1
gc.collect()
assert t1_ref() is None
_assert_equality()
del t2
gc.collect()
assert t2_ref() is None
_assert_equality()
def test_nonreferencable() -> None:
class T:
__slots__ = ("x",)
def method(self) -> None: ...
t = T()
with pytest.warns(UserWarning, match="failed to create weakref"):
cb = weak_callback(t.method)
assert cb.dereference() == t.method
with pytest.raises(TypeError):
weak_callback(t.method, on_ref_error="raise")
cb = weak_callback(t.method, on_ref_error="ignore")
assert cb.dereference() == t.method
@pytest.mark.parametrize("strong", [True, False])
def test_deref(strong: bool) -> None:
def func(x): ...
p = partial(func, 1)
cb = weak_callback(p, strong_func=strong)
dp = cb.dereference()
assert dp.func is p.func
assert dp.args == p.args
assert dp.keywords == p.keywords
def test_queued_callbacks() -> None:
from psygnal._queue import QueuedCallback
def func(x):
return x
cb = weak_callback(func)
qcb = QueuedCallback(cb, thread="current")
assert qcb.dereference() is func
assert qcb(1) == 1
def test_cb_raises() -> None:
from psygnal import EmitLoopError
sig = SignalInstance((int,), name="sig")
class T:
@property
def x(self) -> int:
return 1
@x.setter
def x(self, value: int) -> None:
1 / value
def __setitem__(self, key: str, value: int) -> Any:
1 / value
def method(self, x: int) -> None:
1 / x
t = T()
sig.connect(t.method)
error_re = re.compile(
f"emitting signal.*'sig'.*{re.escape(__file__)}.*method", re.DOTALL
)
with pytest.raises(EmitLoopError, match=error_re):
sig.emit("a")
sig.disconnect(t.method)
sig.connect_setattr(t, "x", maxargs=1)
error_re = re.compile(
f"emitting signal.*'sig'.*{re.escape(__file__)}.*x", re.DOTALL
)
with pytest.raises(EmitLoopError, match=error_re):
sig.emit("a")
sig.disconnect_setattr(t, "x")
sig.connect_setitem(t, "x", maxargs=1)
error_re = re.compile(
f"emitting signal.*'sig'.*{re.escape(__file__)}.*__setitem__", re.DOTALL
)
with pytest.raises(EmitLoopError, match=error_re):
sig.emit("a")
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