fix(api): flesh out types for api_app.py

invokeai/app/api_app.py

@@ -1,3 +1,5 @@
+from typing import Any
+from fastapi.responses import HTMLResponse
 from .services.config import InvokeAIAppConfig
 
 # parse_args() must be called before any other imports. if it is not called first, consumers of the config
@@ -13,7 +15,6 @@ if True:  # hack to make flake8 happy with imports coming after setting up the c
     from inspect import signature
     from pathlib import Path
 
-    import torch
     import uvicorn
     from fastapi import FastAPI
     from fastapi.middleware.cors import CORSMiddleware
@@ -26,6 +27,7 @@ if True:  # hack to make flake8 happy with imports coming after setting up the c
     from pydantic.json_schema import models_json_schema
     from fastapi.responses import FileResponse
 
+    # for PyCharm:
     # noinspection PyUnresolvedReferences
     import invokeai.backend.util.hotfixes  # noqa: F401 (monkeypatching on import)
     import invokeai.frontend.web as web_dir
@@ -36,16 +38,15 @@ if True:  # hack to make flake8 happy with imports coming after setting up the c
     from .api.routers import app_info, board_images, boards, images, models, session_queue, sessions, utilities
     from .api.sockets import SocketIO
     from .invocations.baseinvocation import BaseInvocation, UIConfigBase, _InputField, _OutputField
+    from torch.backends.mps import is_available as is_mps_available
 
-    if torch.backends.mps.is_available():
-        # noinspection PyUnresolvedReferences
+    if is_mps_available():
         import invokeai.backend.util.mps_fixes  # noqa: F401 (monkeypatching on import)
 
 
 app_config = InvokeAIAppConfig.get_config()
 app_config.parse_args()
 logger = InvokeAILogger.get_logger(config=app_config)
-
 # fix for windows mimetypes registry entries being borked
 # see https://github.com/invoke-ai/InvokeAI/discussions/3684#discussioncomment-6391352
 mimetypes.add_type("application/javascript", ".js")
@@ -78,13 +79,13 @@ app.add_middleware(GZipMiddleware, minimum_size=1000)
 
 # Add startup event to load dependencies
 @app.on_event("startup")
-async def startup_event():
+async def startup_event() -> None:
     ApiDependencies.initialize(config=app_config, event_handler_id=event_handler_id, logger=logger)
 
 
 # Shut down threads
 @app.on_event("shutdown")
-async def shutdown_event():
+async def shutdown_event() -> None:
     ApiDependencies.shutdown()
 
 
@@ -108,7 +109,7 @@ app.include_router(session_queue.session_queue_router, prefix="/api")
 
 # Build a custom OpenAPI to include all outputs
 # TODO: can outputs be included on metadata of invocation schemas somehow?
-def custom_openapi():
+def custom_openapi() -> dict[str, Any]:
     if app.openapi_schema:
         return app.openapi_schema
     openapi_schema = get_openapi(
@@ -179,18 +180,18 @@ app.openapi = custom_openapi  # type: ignore [method-assign] # this is a valid a
 
 
 @app.get("/docs", include_in_schema=False)
-def overridden_swagger():
+def overridden_swagger() -> HTMLResponse:
     return get_swagger_ui_html(
-        openapi_url=app.openapi_url,
+        openapi_url=app.openapi_url,  # type: ignore [arg-type] # this is always a string
         title=app.title,
         swagger_favicon_url="/static/docs/favicon.ico",
     )
 
 
 @app.get("/redoc", include_in_schema=False)
-def overridden_redoc():
+def overridden_redoc() -> HTMLResponse:
     return get_redoc_html(
-        openapi_url=app.openapi_url,
+        openapi_url=app.openapi_url,  # type: ignore [arg-type] # this is always a string
         title=app.title,
         redoc_favicon_url="/static/docs/favicon.ico",
     )
@@ -212,8 +213,8 @@ app.mount("/assets", StaticFiles(directory=Path(web_root_path, "dist/assets/")),
 app.mount("/locales", StaticFiles(directory=Path(web_root_path, "dist/locales/")), name="locales")
 
 
-def invoke_api():
-    def find_port(port: int):
+def invoke_api() -> None:
+    def find_port(port: int) -> int:
         """Find a port not in use starting at given port"""
         # Taken from https://waylonwalker.com/python-find-available-port/, thanks Waylon!
         # https://github.com/WaylonWalker