Shallow copy resources and resource factories instead of using context chain lookup

docs/userguide/contexts.rst

@@ -171,7 +171,7 @@ For example::
     class FooComponent(Component):
         async def start():
             service = SomeService()
-            await service.start(ctx)
+            await service.start()
             add_teardown_callback(service.stop)
             add_resource(service)
 

docs/versionhistory.rst

@@ -45,6 +45,7 @@ This library adheres to `Semantic Versioning 2.0 <https://semver.org/>`_.
 
   * Dropped the ``TeardownError`` exception in favor of PEP 654 exception groups
   * Dropped the ``Context.loop`` attribute
+  * Dropped the ``Context.context_chain`` attribute
   * Dropped the ``Context.close()`` method (``Context`` objects are now required to be
     used as context managers)
   * Dropped the deprecated ability to use a ``Context`` as a synchronous context manager
@@ -59,6 +60,10 @@ This library adheres to `Semantic Versioning 2.0 <https://semver.org/>`_.
       resource factories, and optionally waiting for the resource to become available
     * ``get_resource_nowait()`` the synchronous counterpart to the above, but incapable
       of waiting for resources or triggering asynchronous resource factories
+  * Contexts now make a shallow copy of the non-generated resources, and resource
+    factories, from their parents rather than allowing lookup from parents. This was
+    done to prevent service tasks from using resources added later in the application
+    startup cycle which would be torn down before the tasks.
 - **BACKWARD INCOMPATIBLE** Dropped the deprecated ``Dependency()`` marker
 - **BACKWARD INCOMPATIBLE** Changes in the event system:
 

examples/tutorial1/echo/server.py

@@ -5,11 +5,7 @@
 
 import anyio
 from anyio.abc import SocketStream, TaskStatus
-from asphalt.core import (
-    Component,
-    run_application,
-    start_service_task,
-)
+from asphalt.core import Component, run_application, start_service_task
 
 
 async def handle(stream: SocketStream) -> None:

pyproject.toml

@@ -72,12 +72,14 @@ extend-select = [
     "I",            # isort
     "ISC",          # flake8-implicit-str-concat
     "PGH",          # pygrep-hooks
-    "RUF100",       # unused noqa (yesqa)
+    "RUF",          # Ruff-specific rules
     "UP",           # pyupgrade
     "W",            # pycodestyle warnings
 ]
 ignore = [
-    "ASYNC109"
+    "ASYNC109",
+    "ASYNC115",
+    "RUF001",
 ]
 
 [tool.ruff.lint.isort]

src/asphalt/core/__init__.py

@@ -5,8 +5,6 @@
 from ._component import start_component as start_component
 from ._concurrent import TaskFactory as TaskFactory
 from ._concurrent import TaskHandle as TaskHandle
-from ._concurrent import start_background_task_factory as start_background_task_factory
-from ._concurrent import start_service_task as start_service_task
 from ._context import Context as Context
 from ._context import ResourceEvent as ResourceEvent
 from ._context import add_resource as add_resource
@@ -19,6 +17,8 @@
 from ._context import get_resources as get_resources
 from ._context import inject as inject
 from ._context import resource as resource
+from ._context import start_background_task_factory as start_background_task_factory
+from ._context import start_service_task as start_service_task
 from ._event import Event as Event
 from ._event import Signal as Signal
 from ._event import SignalQueueFull as SignalQueueFull