Merge pull request #17205 from jdavcs/dev_cbv

Vendorize fastapi-utls.cbv

lib/galaxy/dependencies/pinned-requirements.txt

@@ -64,7 +64,6 @@ ecdsa==0.18.0 ; python_version >= "3.8" and python_version < "3.12"
 edam-ontology==1.25.2 ; python_version >= "3.8" and python_version < "3.12"
 email-validator==2.1.0.post1 ; python_version >= "3.8" and python_version < "3.12"
 exceptiongroup==1.2.0 ; python_version >= "3.8" and python_version < "3.11"
-fastapi-utils==0.2.1 ; python_version >= "3.8" and python_version < "3.12"
 fastapi==0.98.0 ; python_version >= "3.8" and python_version < "3.12"
 filelock==3.13.1 ; python_version >= "3.8" and python_version < "3.12"
 frozenlist==1.4.1 ; python_version >= "3.8" and python_version < "3.12"

lib/galaxy/webapps/galaxy/api/__init__.py

@@ -38,7 +38,6 @@ from fastapi.security import (
     APIKeyHeader,
     APIKeyQuery,
 )
-from fastapi_utils.cbv import cbv
 from pydantic import ValidationError
 from pydantic.main import BaseModel
 from starlette.datastructures import Headers
@@ -71,6 +70,7 @@ from galaxy.security.idencoding import IdEncodingHelper
 from galaxy.structured_app import StructuredApp
 from galaxy.web.framework.decorators import require_admin_message
 from galaxy.webapps.base.controller import BaseAPIController
+from galaxy.webapps.galaxy.api.cbv import cbv
 from galaxy.work.context import (
     GalaxyAbstractRequest,
     GalaxyAbstractResponse,

lib/galaxy/webapps/galaxy/api/cbv.py

@@ -0,0 +1,119 @@
+"""
+Original implementation by David Montague (@dmontagu)
+https://github.com/dmontagu/fastapi-utils
+"""
+from __future__ import annotations
+
+import inspect
+from collections.abc import Callable
+from typing import (
+    Any,
+    get_type_hints,
+    TypeVar,
+)
+
+from fastapi import (
+    APIRouter,
+    Depends,
+)
+from pydantic.typing import is_classvar
+from starlette.routing import (
+    Route,
+    WebSocketRoute,
+)
+
+T = TypeVar("T")
+
+CBV_CLASS_KEY = "__cbv_class__"
+
+
+def cbv(router: APIRouter) -> Callable[[type[T]], type[T]]:
+    """
+    This function returns a decorator that converts the decorated into a class-based view for the provided router.
+
+    Any methods of the decorated class that are decorated as endpoints using the router provided to this function
+    will become endpoints in the router. The first positional argument to the methods (typically `self`)
+    will be populated with an instance created using FastAPI's dependency-injection.
+
+    For more detail, review the documentation at
+    https://fastapi-utils.davidmontague.xyz/user-guide/class-based-views/#the-cbv-decorator
+    """
+
+    def decorator(cls: type[T]) -> type[T]:
+        return _cbv(router, cls)
+
+    return decorator
+
+
+def _cbv(router: APIRouter, cls: type[T]) -> type[T]:
+    """
+    Replaces any methods of the provided class `cls` that are endpoints of routes in `router` with updated
+    function calls that will properly inject an instance of `cls`.
+    """
+    _init_cbv(cls)
+    cbv_router = APIRouter()
+    function_members = inspect.getmembers(cls, inspect.isfunction)
+    functions_set = {func for _, func in function_members}
+    cbv_routes = [
+        route
+        for route in router.routes
+        if isinstance(route, (Route, WebSocketRoute)) and route.endpoint in functions_set
+    ]
+    for route in cbv_routes:
+        router.routes.remove(route)
+        _update_cbv_route_endpoint_signature(cls, route)
+        cbv_router.routes.append(route)
+    router.include_router(cbv_router)
+    return cls
+
+
+def _init_cbv(cls: type[Any]) -> None:
+    """
+    Idempotently modifies the provided `cls`, performing the following modifications:
+    * The `__init__` function is updated to set any class-annotated dependencies as instance attributes
+    * The `__signature__` attribute is updated to indicate to FastAPI what arguments should be passed to the initializer
+    """
+    if getattr(cls, CBV_CLASS_KEY, False):  # pragma: no cover
+        return  # Already initialized
+    old_init: Callable[..., Any] = cls.__init__
+    old_signature = inspect.signature(old_init)
+    old_parameters = list(old_signature.parameters.values())[1:]  # drop `self` parameter
+    new_parameters = [
+        x for x in old_parameters if x.kind not in (inspect.Parameter.VAR_POSITIONAL, inspect.Parameter.VAR_KEYWORD)
+    ]
+    dependency_names: list[str] = []
+    for name, hint in get_type_hints(cls).items():
+        if is_classvar(hint):
+            continue
+        parameter_kwargs = {"default": getattr(cls, name, Ellipsis)}
+        dependency_names.append(name)
+        new_parameters.append(
+            inspect.Parameter(name=name, kind=inspect.Parameter.KEYWORD_ONLY, annotation=hint, **parameter_kwargs)
+        )
+    new_signature = old_signature.replace(parameters=new_parameters)
+
+    def new_init(self: Any, *args: Any, **kwargs: Any) -> None:
+        for dep_name in dependency_names:
+            dep_value = kwargs.pop(dep_name)
+            setattr(self, dep_name, dep_value)
+        old_init(self, *args, **kwargs)
+
+    setattr(cls, "__signature__", new_signature)  # noqa: B010
+    setattr(cls, "__init__", new_init)  # noqa: B010
+    setattr(cls, CBV_CLASS_KEY, True)
+
+
+def _update_cbv_route_endpoint_signature(cls: type[Any], route: Route | WebSocketRoute) -> None:
+    """
+    Fixes the endpoint signature for a cbv route to ensure FastAPI performs dependency injection properly.
+    """
+    old_endpoint = route.endpoint
+    old_signature = inspect.signature(old_endpoint)
+    old_parameters: list[inspect.Parameter] = list(old_signature.parameters.values())
+    old_first_parameter = old_parameters[0]
+    new_first_parameter = old_first_parameter.replace(default=Depends(cls))
+    new_parameters = [new_first_parameter] + [
+        parameter.replace(kind=inspect.Parameter.KEYWORD_ONLY) for parameter in old_parameters[1:]
+    ]
+    new_signature = old_signature.replace(parameters=new_parameters)
+    setattr(route.endpoint, "__signature__", new_signature)  # noqa: B010

packages/web_apps/setup.cfg

@@ -43,7 +43,6 @@ install_requires =
     Babel
     Cheetah3!=3.2.6.post2
     fastapi>=0.71.0,!=0.89.0,<0.99
-    fastapi-utils
     gunicorn
     gxformat2
     importlib-resources;python_version<'3.9'

pyproject.toml

@@ -58,7 +58,6 @@ docutils = "!=0.17, !=0.17.1"
 dparse = "*"
 edam-ontology = "*"
 fastapi = ">=0.71.0, !=0.89.0, <0.99"  # https://github.com/tiangolo/fastapi/issues/4041 https://github.com/tiangolo/fastapi/issues/5861
-fastapi-utils = "*"
 fs = "*"
 future = "*"
 galaxy_sequence_utils = "*"

test/unit/webapps/api/test_cbv.py

@@ -0,0 +1,98 @@
+"""
+Original implementation by David Montague (@dmontagu)
+https://github.com/dmontagu/fastapi-utils
+"""
+from __future__ import annotations
+
+from typing import (
+    Any,
+    ClassVar,
+    Optional,
+)
+
+from fastapi import (
+    APIRouter,
+    Depends,
+    FastAPI,
+)
+from starlette.testclient import TestClient
+
+from galaxy.webapps.galaxy.api.cbv import cbv
+
+
+def test_cbv() -> None:
+    router = APIRouter()
+
+    def dependency() -> int:
+        return 1
+
+    @cbv(router)
+    class CBV:
+        x: int = Depends(dependency)
+        cx: ClassVar[int] = 1
+        cy: ClassVar[int]
+
+        def __init__(self, z: int = Depends(dependency)):
+            self.y = 1
+            self.z = z
+
+        @router.get("/", response_model=int)
+        def f(self) -> int:
+            return self.cx + self.x + self.y + self.z
+
+        @router.get("/classvar", response_model=bool)
+        def g(self) -> bool:
+            return hasattr(self, "cy")
+
+    app = FastAPI()
+    app.include_router(router)
+    client = TestClient(app)
+    response_1 = client.get("/")
+    assert response_1.status_code == 200
+    assert response_1.content == b"4"
+
+    response_2 = client.get("/classvar")
+    assert response_2.status_code == 200
+    assert response_2.content == b"false"
+
+
+def test_method_order_preserved() -> None:
+    router = APIRouter()
+
+    @cbv(router)
+    class TestCBV:
+        @router.get("/test")
+        def get_test(self) -> int:
+            return 1
+
+        @router.get("/{item_id}")
+        def get_item(self) -> int:  # Alphabetically before `get_test`
+            return 2
+
+    app = FastAPI()
+    app.include_router(router)
+
+    assert TestClient(app).get("/test").json() == 1
+    assert TestClient(app).get("/other").json() == 2
+
+
+def test_multiple_decorators() -> None:
+    router = APIRouter()
+
+    @cbv(router)
+    class RootHandler:
+        @router.get("/items/?")
+        @router.get("/items/{item_path:path}")
+        @router.get("/database/{item_path:path}")
+        def root(self, item_path: Optional[str] = None, item_query: Optional[str] = None) -> Any:  # noqa: UP007
+            if item_path:
+                return {"item_path": item_path}
+            if item_query:
+                return {"item_query": item_query}
+            return []
+
+    client = TestClient(router)
+
+    assert client.get("/items").json() == []
+    assert client.get("/items/1").json() == {"item_path": "1"}
+    assert client.get("/database/abc").json() == {"item_path": "abc"}