|
1
|
|
|
""" |
|
2
|
|
|
Code in this module is used to wrap and decorate functions that have been |
|
3
|
|
|
bound to a container |
|
4
|
|
|
""" |
|
5
|
1 |
|
import functools |
|
6
|
1 |
|
import inspect |
|
7
|
|
|
from typing import Protocol, Any |
|
8
|
1 |
|
|
|
9
|
1 |
|
from .exceptions import UnableToInvokeBoundFunction |
|
10
|
|
|
from .injection_context import TemporaryInjectionContext |
|
11
|
|
|
from .interfaces import ReadableContainer, ContainerBoundFunction |
|
12
|
1 |
|
from .util.reflection import FunctionSpec |
|
13
|
|
|
|
|
14
|
|
|
|
|
15
|
1 |
|
class _Callable(Protocol): |
|
16
|
1 |
|
""" |
|
17
|
|
|
This is a bit of a hack so that a callable can be provided to a class without mypy thinking its a class method |
|
18
|
1 |
|
""" |
|
19
|
1 |
|
|
|
20
|
1 |
|
def __call__(self, *args, **kwargs) -> Any: |
|
21
|
1 |
|
pass |
|
22
|
|
|
|
|
23
|
|
|
|
|
24
|
|
|
class RegularFunc(ContainerBoundFunction): |
|
25
|
1 |
|
""" |
|
26
|
1 |
|
Represents a function that has been bound to a container |
|
27
|
1 |
|
""" |
|
28
|
1 |
|
|
|
29
|
|
|
_argument_updater: _Callable |
|
30
|
1 |
|
_base_injection_context: TemporaryInjectionContext |
|
31
|
|
|
_inner_func: _Callable |
|
32
|
|
|
|
|
33
|
1 |
|
def __init__(self, inner_func, base_injection_context, argument_updater): |
|
34
|
|
|
self._inner_func = inner_func |
|
35
|
|
|
self._base_injection_context = base_injection_context |
|
36
|
|
|
self._argument_updater = argument_updater |
|
37
|
|
|
|
|
38
|
|
|
def __call__(self, *args, **kwargs): |
|
39
|
|
|
argument_updater = self._argument_updater |
|
40
|
|
|
inner_func = self._inner_func |
|
41
|
|
|
bound_args, bound_kwargs = argument_updater( |
|
42
|
1 |
|
self._base_injection_context, args, kwargs |
|
43
|
1 |
|
) |
|
44
|
1 |
|
return inner_func(*bound_args, **bound_kwargs) |
|
45
|
1 |
|
|
|
46
|
1 |
|
def rebind(self, container: ReadableContainer): |
|
47
|
|
|
return RegularFunc( |
|
48
|
1 |
|
self._inner_func, |
|
49
|
|
|
self._base_injection_context.rebind(container), |
|
50
|
|
|
self._argument_updater, |
|
51
|
|
|
) |
|
52
|
|
|
|
|
53
|
1 |
|
|
|
54
|
|
|
class AsyncFunc(ContainerBoundFunction): |
|
55
|
1 |
|
""" |
|
56
|
|
|
Represents an async function that has been bound to a container |
|
57
|
|
|
""" |
|
58
|
|
|
|
|
59
|
|
|
_argument_updater: _Callable |
|
60
|
|
|
_base_injection_context: TemporaryInjectionContext |
|
61
|
|
|
_inner_func: _Callable |
|
62
|
|
|
|
|
63
|
|
|
def __init__(self, inner_func, base_injection_context, argument_updater): |
|
64
|
|
|
self._inner_func = inner_func |
|
65
|
|
|
self._base_injection_context = base_injection_context |
|
66
|
|
|
self._argument_updater = argument_updater |
|
67
|
|
|
|
|
68
|
|
|
def __call__(self, *args, **kwargs): |
|
69
|
|
|
return self.__async_call__(*args, **kwargs) |
|
70
|
|
|
|
|
71
|
|
|
async def __async_call__(self, *args, **kwargs): |
|
72
|
|
|
argument_updater = self._argument_updater |
|
73
|
|
|
inner_func = self._inner_func |
|
74
|
|
|
bound_args, bound_kwargs = argument_updater( |
|
75
|
|
|
self._base_injection_context, args, kwargs |
|
76
|
|
|
) |
|
77
|
|
|
return await inner_func(*bound_args, **bound_kwargs) |
|
78
|
|
|
|
|
79
|
|
|
def as_coroutine(self): |
|
80
|
|
|
""" |
|
81
|
|
|
returns a coroutine that wraps this class. Some class methods |
|
82
|
|
|
also get added to the coroutine. This is so it acts like a class with |
|
83
|
|
|
an __asynccall__ magic method. |
|
84
|
|
|
""" |
|
85
|
|
|
|
|
86
|
|
|
async def _coroutine_func(*args, **kwargs): |
|
87
|
|
|
return await self.__async_call__(*args, **kwargs) |
|
88
|
|
|
|
|
89
|
|
|
_coroutine_func.rebind = self.rebind # type: ignore |
|
90
|
|
|
|
|
91
|
|
|
return _coroutine_func |
|
92
|
|
|
|
|
93
|
|
|
def rebind(self, container: ReadableContainer): |
|
94
|
|
|
return AsyncFunc( |
|
95
|
|
|
self._inner_func, |
|
96
|
|
|
self._base_injection_context.rebind(container), |
|
97
|
|
|
self._argument_updater, |
|
98
|
|
|
).as_coroutine() |
|
99
|
|
|
|
|
100
|
|
|
|
|
101
|
|
|
def apply_argument_updater( |
|
102
|
|
|
func, |
|
103
|
|
|
base_injection_context, |
|
104
|
|
|
argument_updater, |
|
105
|
|
|
spec: FunctionSpec, |
|
106
|
|
|
catch_errors=False, |
|
107
|
|
|
) -> ContainerBoundFunction: |
|
108
|
|
|
""" |
|
109
|
|
|
Takes a function and binds it to a container with an update function |
|
110
|
|
|
""" |
|
111
|
|
|
inner_func = func if not catch_errors else _wrap_func_in_error_handling(func, spec) |
|
112
|
|
|
if inspect.iscoroutinefunction(func): |
|
113
|
|
|
|
|
114
|
|
|
_bound_func = AsyncFunc( |
|
115
|
|
|
inner_func, base_injection_context, argument_updater |
|
116
|
|
|
).as_coroutine() |
|
117
|
|
|
|
|
118
|
|
|
else: |
|
119
|
|
|
|
|
120
|
|
|
_bound_func = RegularFunc(inner_func, base_injection_context, argument_updater) |
|
121
|
|
|
|
|
122
|
|
|
return functools.wraps(func)(_bound_func) |
|
123
|
|
|
|
|
124
|
|
|
|
|
125
|
|
|
def _wrap_func_in_error_handling(func, spec: FunctionSpec): |
|
126
|
|
|
""" |
|
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
|
|
|
@functools.wraps(func) |
|
135
|
|
|
def _error_handling_func(*args, **kwargs): |
|
136
|
|
|
try: |
|
137
|
|
|
return func(*args, **kwargs) |
|
138
|
|
|
except TypeError as error: |
|
139
|
|
|
# if it wasn't in kwargs the container couldn't build it |
|
140
|
|
|
unresolvable_deps = [ |
|
141
|
|
|
dep_type |
|
142
|
|
|
for (name, dep_type) in spec.annotations.items() |
|
143
|
|
|
if name not in kwargs.keys() |
|
144
|
|
|
] |
|
145
|
|
|
raise UnableToInvokeBoundFunction(str(error), unresolvable_deps) |
|
146
|
|
|
|
|
147
|
|
|
return _error_handling_func |
|
148
|
|
|
|
meadsteve /
lagom
