ci: run slotscheck cli as ci job (#3275)

This PR moves running slotscheck from within pre-commit to its own job in ci (same as we've done with other tools that require the configured environment to run).

This partially fixes an issue identified in #3251 where the `litestar` package was inadvertently excluded from this check due to an incorrect regex pattern.

Applies fixes for issues identified by the tool.

Co-authored-by: Arie Bovenberg <a.c.bovenberg@gmail.com>

.github/workflows/ci.yml

@@ -81,6 +81,31 @@ jobs:
       - name: Run pyright
         run: pdm run pyright
 
+  slotscheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.8"
+          allow-prereleases: false
+
+      - uses: pdm-project/setup-pdm@v4
+        name: Set up PDM
+        with:
+          python-version: "3.8"
+          allow-python-prereleases: false
+          cache: true
+          cache-dependency-path: |
+            ./pdm.lock
+
+      - name: Install dependencies
+        run: pdm install -G:all
+
+      - name: Run slotscheck
+        run: pdm run slotscheck litestar
+
   test:
     name: "test (${{ matrix.python-version }})"
     strategy:

.pre-commit-config.yaml

@@ -41,11 +41,6 @@ repos:
       - id: ensure-dunder-all
         exclude: "test*|examples*|tools"
         args: ["--use-tuple"]
-  - repo: https://github.com/ariebovenberg/slotscheck
-    rev: v0.19.0
-    hooks:
-      - id: slotscheck
-        exclude: "test_*|docs|.github"
   - repo: https://github.com/sphinx-contrib/sphinx-lint
     rev: "v0.9.1"
     hooks:

Makefile

@@ -102,8 +102,14 @@ pre-commit: 										## Runs pre-commit hooks; includes ruff formatting and lin
 	@$(PDM) run pre-commit run --all-files
 	@echo "=> Pre-commit complete"
 
+.PHONY: slots-check
+slots-check: 										## Check for slots usage in classes
+	@echo "=> Checking for slots usage in classes"
+	@$(PDM) run slotscheck litestar
+	@echo "=> Slots check complete"
+
 .PHONY: lint
-lint: pre-commit type-check 						## Run all linting
+lint: pre-commit type-check slots-check				## Run all linting
 
 .PHONY: coverage
 coverage:  											## Run the tests and generate coverage report

litestar/app.py

@@ -150,21 +150,17 @@ class Litestar(Router):
         "csrf_config",
         "event_emitter",
         "get_logger",
-        "include_in_schema",
         "logger",
         "logging_config",
         "multipart_form_part_limit",
         "on_shutdown",
         "on_startup",
         "openapi_config",
-        "request_class",
         "response_cache_config",
         "route_map",
-        "signature_namespace",
         "state",
         "stores",
         "template_engine",
-        "websocket_class",
         "pdb_on_exception",
         "experimental_features",
     )

litestar/contrib/opentelemetry/middleware.py

@@ -24,8 +24,6 @@
 class OpenTelemetryInstrumentationMiddleware(AbstractMiddleware):
     """OpenTelemetry Middleware."""
 
-    __slots__ = ("open_telemetry_middleware",)
-
     def __init__(self, app: ASGIApp, config: OpenTelemetryConfig) -> None:
         """Middleware that adds OpenTelemetry instrumentation to the application.
 

litestar/dto/_types.py

@@ -96,9 +96,6 @@ class MappingType(CompositeType):
 @dataclass(frozen=True)
 class TransferDTOFieldDefinition(DTOFieldDefinition):
     __slots__ = (
-        "default_factory",
-        "dto_field",
-        "model_name",
         "is_excluded",
         "is_partial",
         "serialization_name",

litestar/handlers/websocket_handlers/listener.py

@@ -62,11 +62,10 @@ class WebsocketListenerRouteHandler(WebsocketRouteHandler):
         "connection_accept_handler": "Callback to accept a WebSocket connection. By default, calls WebSocket.accept",
         "on_accept": "Callback invoked after a WebSocket connection has been accepted",
         "on_disconnect": "Callback invoked after a WebSocket connection has been closed",
-        "weboscket_class": "WebSocket class",
         "_connection_lifespan": None,
-        "_handle_receive": None,
-        "_handle_send": None,
+        "_receive_handler": None,
         "_receive_mode": None,
+        "_send_handler": None,
         "_send_mode": None,
     }
 

litestar/handlers/websocket_handlers/route_handler.py

@@ -18,6 +18,8 @@ class WebsocketRouteHandler(BaseRouteHandler):
     Use this decorator to decorate websocket handler functions.
     """
 
+    __slots__ = ("websocket_class",)
+
     def __init__(
         self,
         path: str | list[str] | None = None,

litestar/middleware/compression/facade.py

@@ -12,6 +12,8 @@
 class CompressionFacade(Protocol):
     """A unified facade offering a uniform interface for different compression libraries."""
 
+    __slots__ = ()
+
     encoding: ClassVar[str]
     """The encoding of the compression."""
 

litestar/middleware/cors.py

@@ -17,8 +17,6 @@
 class CORSMiddleware(AbstractMiddleware):
     """CORS Middleware."""
 
-    __slots__ = ("config",)
-
     def __init__(self, app: ASGIApp, config: CORSConfig) -> None:
         """Middleware that adds CORS validation to the application.
 

litestar/middleware/logging.py

@@ -48,8 +48,6 @@
 class LoggingMiddleware(AbstractMiddleware):
     """Logging middleware."""
 
-    __slots__ = ("config", "logger", "request_extractor", "response_extractor", "is_struct_logger")
-
     logger: Logger
 
     def __init__(self, app: ASGIApp, config: LoggingMiddlewareConfig) -> None:

litestar/middleware/rate_limit.py

@@ -41,8 +41,6 @@ class CacheObject:
 class RateLimitMiddleware(AbstractMiddleware):
     """Rate-limiting middleware."""
 
-    __slots__ = ("app", "check_throttle_handler", "max_requests", "unit", "request_quota", "config")
-
     def __init__(self, app: ASGIApp, config: RateLimitConfig) -> None:
         """Initialize ``RateLimitMiddleware``.
 

litestar/plugins/base.py

@@ -212,6 +212,8 @@ def to_openapi_schema(self, field_definition: FieldDefinition, schema_creator: S
 class OpenAPISchemaPlugin(OpenAPISchemaPluginProtocol):
     """Plugin to extend the support of OpenAPI schema generation for non-library types."""
 
+    __slots__ = ()
+
     @staticmethod
     def is_plugin_supported_type(value: Any) -> bool:
         """Given a value of indeterminate type, determine if this value is supported by the plugin.

litestar/stores/base.py

@@ -20,6 +20,8 @@
 class Store(ABC):
     """Thread and process safe asynchronous key/value store."""
 
+    __slots__ = ()
+
     @abstractmethod
     async def set(self, key: str, value: str | bytes, expires_in: int | timedelta | None = None) -> None:
         """Set a value.
@@ -97,6 +99,8 @@ class NamespacedStore(Store):
     should be isolated.
     """
 
+    __slots__ = ("namespace",)
+
     @abstractmethod
     def with_namespace(self, namespace: str) -> Self:
         """Return a new instance of :class:`NamespacedStore`, which exists in a child namespace of the current namespace.

litestar/stores/redis.py

@@ -21,7 +21,12 @@
 class RedisStore(NamespacedStore):
     """Redis based, thread and process safe asynchronous key/value store."""
 
-    __slots__ = ("_redis",)
+    __slots__ = (
+        "_delete_all_script",
+        "_get_and_renew_script",
+        "_redis",
+        "handle_client_shutdown",
+    )
 
     def __init__(
         self, redis: Redis, namespace: str | None | EmptyType = Empty, handle_client_shutdown: bool = False

pyproject.toml

@@ -285,6 +285,12 @@ reportUnnecessaryTypeIgnoreComments = true
 
 [tool.slotscheck]
 strict-imports = false
+exclude-classes = """
+(
+  # github.com/python/cpython/pull/106771
+  (^litestar.events.emitter:BaseEventEmitterBackend)
+)
+"""
 
 [tool.ruff]
 lint.select = [