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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,4 @@ | ||
from .resolve import resolve, Depends | ||
from .lazy import Lazy, LazyResolver | ||
from .exceptions import GeneratorClosureException, InvalidGeneratorFactoryExcpetion | ||
from .context import ResolutionContextManager, resolve_open |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,60 @@ | ||
from typing import TypeVar, Generic, Callable | ||
from dataclasses import dataclass | ||
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from .resolve import ( | ||
_Context, | ||
_resolve, | ||
_close_open_generators, | ||
get_context, | ||
_create_context, | ||
) | ||
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TContextValue = TypeVar("TContextValue") | ||
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@dataclass | ||
class ResolutionContextManager(Generic[TContextValue]): | ||
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factory: Callable[..., TContextValue] | ||
context: _Context | ||
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def __enter__(self) -> TContextValue: | ||
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try: | ||
value = _resolve(self.factory, self.context) | ||
except Exception as ex: | ||
if len(self.context.open_generators) > 0: | ||
_close_open_generators(self.context, ex) | ||
raise ex | ||
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return value | ||
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def __exit__(self, exc_type, exc_value, exc_traceback): | ||
if len(self.context.open_generators) > 0: | ||
_close_open_generators(self.context, exc_value) | ||
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def resolve_open( | ||
factory: Callable[..., TContextValue], | ||
overrides: dict = None, | ||
) -> ResolutionContextManager[TContextValue]: | ||
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context = _create_context(overrides) | ||
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resolved_cache = {} | ||
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context = _Context( | ||
resolved_cache=resolved_cache, | ||
open_generators=[], | ||
) | ||
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resolved_cache[get_context] = context | ||
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if overrides is not None: | ||
resolved_cache.update(overrides) | ||
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return ResolutionContextManager[TContextValue]( | ||
factory=factory, | ||
context=context, | ||
) |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,95 @@ | ||
from dataclasses import dataclass | ||
from unittest.mock import Mock, call | ||
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from pytest import raises | ||
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from deadsimple import Depends, resolve_open | ||
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@dataclass | ||
class _TestDepA: | ||
value: str | ||
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@dataclass | ||
class _TestDepB: | ||
dep_a: _TestDepA | ||
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def test_context_closes_only_after_exit(): | ||
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mock = Mock() | ||
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def get_dep_a(): | ||
mock.enter_a() | ||
yield _TestDepA(value="some value") | ||
mock.exit_a() | ||
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with resolve_open(get_dep_a) as dep_a: | ||
assert dep_a.value == "some value" | ||
mock.inside_scope() | ||
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expected_calls = [ | ||
call.enter_a(), | ||
call.inside_scope(), | ||
call.exit_a(), | ||
] | ||
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assert mock.mock_calls == expected_calls | ||
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def test_generators_closed_on_exception_in_context(): | ||
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mock = Mock() | ||
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def get_dep_a(): | ||
mock.enter_a() | ||
yield _TestDepA(value="some value") | ||
mock.exit_a() | ||
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class _Exception(Exception): | ||
pass | ||
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with raises(_Exception): | ||
with resolve_open(get_dep_a) as dep_a: | ||
mock.inside_scope() | ||
assert dep_a.value == "some value" | ||
raise _Exception() | ||
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expected_calls = [ | ||
call.enter_a(), | ||
call.inside_scope(), | ||
call.exit_a(), | ||
] | ||
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assert mock.mock_calls == expected_calls | ||
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def test_generators_closed_on_exception_in_dependency(): | ||
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mock = Mock() | ||
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class _Exception(Exception): | ||
pass | ||
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def get_dep_a(): | ||
mock.enter_a() | ||
yield _TestDepA(value="some value") | ||
mock.exit_a() | ||
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def get_dep_b(dep_a=Depends(get_dep_a)): | ||
assert dep_a.value == "some value" | ||
mock.enter_b() | ||
raise _Exception() | ||
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with raises(_Exception): | ||
with resolve_open(get_dep_b): | ||
mock.inside_scope() | ||
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expected_calls = [ | ||
call.enter_a(), | ||
call.enter_b(), | ||
call.exit_a(), | ||
] | ||
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assert mock.mock_calls == expected_calls |