Fixed annotation support.

Signed-off-by: Pavel Kirilin <win10@list.ru>

Author: s3rius

README.md

@@ -362,3 +362,5 @@ def my_function(
     pass
 
 ```
+
+Also, please note that if you're using `from __future__ import annotations` it won't work for python <= 3.9. Because the `inspect.signature` function doesn't support it. In all future versions it will work as expected.

taskiq_dependencies/graph.py

@@ -1,16 +1,8 @@
 import inspect
+import sys
 from collections import defaultdict, deque
 from graphlib import TopologicalSorter
-from typing import (
-    Any,
-    Callable,
-    Dict,
-    ForwardRef,
-    List,
-    Optional,
-    TypeVar,
-    get_type_hints,
-)
+from typing import Any, Callable, Dict, List, Optional, TypeVar, get_type_hints
 
 from taskiq_dependencies.ctx import AsyncResolveContext, SyncResolveContext
 from taskiq_dependencies.dependency import Dependency
@@ -115,6 +107,12 @@ def _build_graph(self) -> None:  # noqa: C901, WPS210
         :raises ValueError: if something happened.
         """
         dep_deque = deque([Dependency(self.target, use_cache=True)])
+        # This is for `from __future__ import annotations` support.
+        # We need to use `eval_str` argument, because
+        # signature of the function is a string, not an object.
+        signature_kwargs: Dict[str, Any] = {}
+        if sys.version_info >= (3, 10):
+            signature_kwargs["eval_str"] = True
 
         while dep_deque:
             dep = dep_deque.popleft()
@@ -164,38 +162,31 @@ def _build_graph(self) -> None:  # noqa: C901, WPS210
                 # If this is a class, we need to get signature of
                 # an __init__ method.
                 hints = get_type_hints(origin.__init__)  # noqa: WPS609
-                sign = inspect.signature(origin.__init__)  # noqa: WPS609
+                sign = inspect.signature(
+                    origin.__init__,  # noqa: WPS609
+                    **signature_kwargs,
+                )
             elif inspect.isfunction(dep.dependency):
                 # If this is function or an instance of a class, we get it's type hints.
                 hints = get_type_hints(dep.dependency)
-                sign = inspect.signature(origin)  # type: ignore
+                sign = inspect.signature(origin, **signature_kwargs)  # type: ignore
             else:
                 hints = get_type_hints(
                     dep.dependency.__call__,  # type: ignore # noqa: WPS609
                 )
-                sign = inspect.signature(origin)  # type: ignore
+                sign = inspect.signature(origin, **signature_kwargs)  # type: ignore
 
             # Now we need to iterate over parameters, to
             # find all parameters, that have TaskiqDepends as it's
             # default vaule.
             for param_name, param in sign.parameters.items():
                 default_value = param.default
-                annotation = param.annotation
-                if isinstance(param.annotation, str):
-                    globalns = getattr(origin, "__globals__", {})
-                    annotation = ForwardRef(  # type: ignore # noqa: WPS437
-                        param.annotation,
-                    )._evaluate(
-                        globalns,
-                        None,
-                        set(),
-                    )
-                if hasattr(annotation, "__metadata__"):  # noqa: WPS421
+                if hasattr(param.annotation, "__metadata__"):  # noqa: WPS421
                     # We go backwards,
                     # because you may want to override your annotation
                     # and the overriden value will appear to be after
                     # the original `Depends` annotation.
-                    for meta in reversed(annotation.__metadata__):
+                    for meta in reversed(param.annotation.__metadata__):
                         if isinstance(meta, Dependency):
                             default_value = meta
                             break