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""" |
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Code in this module is used to wrap and decorate functions that have been |
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bound to a container |
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""" |
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import functools |
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import inspect |
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from typing import Protocol, Any |
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from .exceptions import UnableToInvokeBoundFunction |
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from .injection_context import TemporaryInjectionContext |
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from .interfaces import ReadableContainer, ContainerBoundFunction |
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from .util.reflection import FunctionSpec |
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class _Callable(Protocol): |
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""" |
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This is a bit of a hack so that a callable can be provided to a class without mypy thinking its a class method |
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""" |
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def __call__(self, *args, **kwargs) -> Any: |
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pass |
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class RegularFunc(ContainerBoundFunction): |
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""" |
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Represents a function that has been bound to a container |
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""" |
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_argument_updater: _Callable |
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_base_injection_context: TemporaryInjectionContext |
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_inner_func: _Callable |
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def __init__(self, inner_func, base_injection_context, argument_updater): |
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self._inner_func = inner_func |
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self._base_injection_context = base_injection_context |
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self._argument_updater = argument_updater |
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def __call__(self, *args, **kwargs): |
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argument_updater = self._argument_updater |
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inner_func = self._inner_func |
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bound_args, bound_kwargs = argument_updater( |
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self._base_injection_context, args, kwargs |
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) |
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return inner_func(*bound_args, **bound_kwargs) |
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def rebind(self, container: ReadableContainer): |
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return RegularFunc( |
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self._inner_func, |
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self._base_injection_context.rebind(container), |
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self._argument_updater, |
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) |
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class AsyncFunc(ContainerBoundFunction): |
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""" |
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Represents an async function that has been bound to a container |
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""" |
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_argument_updater: _Callable |
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_base_injection_context: TemporaryInjectionContext |
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_inner_func: _Callable |
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def __init__(self, inner_func, base_injection_context, argument_updater): |
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self._inner_func = inner_func |
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self._base_injection_context = base_injection_context |
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self._argument_updater = argument_updater |
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def __call__(self, *args, **kwargs): |
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return self.__async_call__(*args, **kwargs) |
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async def __async_call__(self, *args, **kwargs): |
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argument_updater = self._argument_updater |
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inner_func = self._inner_func |
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bound_args, bound_kwargs = argument_updater( |
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self._base_injection_context, args, kwargs |
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) |
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return await inner_func(*bound_args, **bound_kwargs) |
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def as_coroutine(self): |
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""" |
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returns a coroutine that wraps this class. Some class methods |
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also get added to the coroutine. This is so it acts like a class with |
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an __asynccall__ magic method. |
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""" |
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85
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86
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1 |
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async def _coroutine_func(*args, **kwargs): |
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87
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1 |
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return await self.__async_call__(*args, **kwargs) |
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88
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89
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1 |
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_coroutine_func.rebind = self.rebind # type: ignore |
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90
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91
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1 |
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return _coroutine_func |
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92
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93
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1 |
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def rebind(self, container: ReadableContainer): |
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94
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1 |
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return AsyncFunc( |
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95
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self._inner_func, |
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96
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self._base_injection_context.rebind(container), |
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97
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self._argument_updater, |
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98
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).as_coroutine() |
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99
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100
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101
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1 |
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def apply_argument_updater( |
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102
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func, |
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103
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base_injection_context, |
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104
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argument_updater, |
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105
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spec: FunctionSpec, |
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106
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catch_errors=False, |
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107
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) -> ContainerBoundFunction: |
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108
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""" |
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109
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Takes a function and binds it to a container with an update function |
|
110
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""" |
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111
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1 |
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inner_func = func if not catch_errors else _wrap_func_in_error_handling(func, spec) |
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112
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1 |
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if inspect.iscoroutinefunction(func): |
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113
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114
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1 |
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_bound_func = AsyncFunc( |
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115
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inner_func, base_injection_context, argument_updater |
|
116
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).as_coroutine() |
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117
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118
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else: |
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119
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120
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1 |
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_bound_func = RegularFunc(inner_func, base_injection_context, argument_updater) |
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121
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|
122
|
1 |
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return functools.wraps(func)(_bound_func) |
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123
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|
124
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|
125
|
1 |
|
def _wrap_func_in_error_handling(func, spec: FunctionSpec): |
|
126
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|
|
""" |
|
127
|
|
|
Takes a func and its spec and returns a function that's the same |
|
128
|
|
|
but with more useful TypeError messages |
|
129
|
|
|
:param func: |
|
130
|
|
|
:param spec: |
|
131
|
|
|
:return: |
|
132
|
|
|
""" |
|
133
|
|
|
|
|
134
|
1 |
|
@functools.wraps(func) |
|
135
|
1 |
|
def _error_handling_func(*args, **kwargs): |
|
136
|
1 |
|
try: |
|
137
|
1 |
|
return func(*args, **kwargs) |
|
138
|
1 |
|
except TypeError as error: |
|
139
|
|
|
# if it wasn't in kwargs the container couldn't build it |
|
140
|
1 |
|
unresolvable_deps = [ |
|
141
|
|
|
dep_type |
|
142
|
|
|
for (name, dep_type) in spec.annotations.items() |
|
143
|
|
|
if name not in kwargs.keys() |
|
144
|
|
|
] |
|
145
|
1 |
|
raise UnableToInvokeBoundFunction(str(error), unresolvable_deps) |
|
146
|
|
|
|
|
147
|
|
|
return _error_handling_func |
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148
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|
meadsteve /
lagom
