InvokeAI/invokeai/app/api_app.py

from .services.config import InvokeAIAppConfig

# parse_args() must be called before any other imports. if it is not called first, consumers of the config
# which are imported/used before parse_args() is called will get the default config values instead of the
# values from the command line or config file.
app_config = InvokeAIAppConfig.get_config()
app_config.parse_args()

if True:  # hack to make flake8 happy with imports coming after setting up the config
    import asyncio
    import mimetypes
    import socket
    from inspect import signature
    from pathlib import Path

    import torch
    import uvicorn
    from fastapi import FastAPI
    from fastapi.middleware.cors import CORSMiddleware
    from fastapi.openapi.docs import get_redoc_html, get_swagger_ui_html
    from fastapi.openapi.utils import get_openapi
    from fastapi.staticfiles import StaticFiles
    from fastapi_events.handlers.local import local_handler
    from fastapi_events.middleware import EventHandlerASGIMiddleware
    from pydantic.json_schema import models_json_schema
    from fastapi.responses import FileResponse

    # noinspection PyUnresolvedReferences
    import invokeai.backend.util.hotfixes  # noqa: F401 (monkeypatching on import)
    import invokeai.frontend.web as web_dir
    from invokeai.version.invokeai_version import __version__

    from ..backend.util.logging import InvokeAILogger
    from .api.dependencies import ApiDependencies
    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

    if torch.backends.mps.is_available():
        # noinspection PyUnresolvedReferences
        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")
mimetypes.add_type("text/css", ".css")

# Create the app
# TODO: create this all in a method so configuration/etc. can be passed in?
app = FastAPI(title="Invoke AI", docs_url=None, redoc_url=None, separate_input_output_schemas=False)

# Add event handler
event_handler_id: int = id(app)
app.add_middleware(
    EventHandlerASGIMiddleware,
    handlers=[local_handler],  # TODO: consider doing this in services to support different configurations
    middleware_id=event_handler_id,
)

socket_io = SocketIO(app)

app.add_middleware(
    CORSMiddleware,
    allow_origins=app_config.allow_origins,
    allow_credentials=app_config.allow_credentials,
    allow_methods=app_config.allow_methods,
    allow_headers=app_config.allow_headers,
)


# Add startup event to load dependencies
@app.on_event("startup")
async def startup_event():
    ApiDependencies.initialize(config=app_config, event_handler_id=event_handler_id, logger=logger)


# Shut down threads
@app.on_event("shutdown")
async def shutdown_event():
    ApiDependencies.shutdown()


# Include all routers
app.include_router(sessions.session_router, prefix="/api")

app.include_router(utilities.utilities_router, prefix="/api")

app.include_router(models.models_router, prefix="/api")

app.include_router(images.images_router, prefix="/api")

app.include_router(boards.boards_router, prefix="/api")

app.include_router(board_images.board_images_router, prefix="/api")

app.include_router(app_info.app_router, prefix="/api")

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():
    if app.openapi_schema:
        return app.openapi_schema
    openapi_schema = get_openapi(
        title=app.title,
        description="An API for invoking AI image operations",
        version="1.0.0",
        routes=app.routes,
        separate_input_output_schemas=False,  # https://fastapi.tiangolo.com/how-to/separate-openapi-schemas/
    )

    # Add all outputs
    all_invocations = BaseInvocation.get_invocations()
    output_types = set()
    output_type_titles = dict()
    for invoker in all_invocations:
        output_type = signature(invoker.invoke).return_annotation
        output_types.add(output_type)

    output_schemas = models_json_schema(
        models=[(o, "serialization") for o in output_types], ref_template="#/components/schemas/{model}"
    )
    for schema_key, output_schema in output_schemas[1]["$defs"].items():
        # TODO: note that we assume the schema_key here is the TYPE.__name__
        # This could break in some cases, figure out a better way to do it
        output_type_titles[schema_key] = output_schema["title"]

    # Add Node Editor UI helper schemas
    ui_config_schemas = models_json_schema(
        [(UIConfigBase, "serialization"), (_InputField, "serialization"), (_OutputField, "serialization")],
        ref_template="#/components/schemas/{model}",
    )
    for schema_key, ui_config_schema in ui_config_schemas[1]["$defs"].items():
        openapi_schema["components"]["schemas"][schema_key] = ui_config_schema

    # Add a reference to the output type to additionalProperties of the invoker schema
    for invoker in all_invocations:
        invoker_name = invoker.__name__
        output_type = signature(obj=invoker.invoke).return_annotation
        output_type_title = output_type_titles[output_type.__name__]
        invoker_schema = openapi_schema["components"]["schemas"][f"{invoker_name}"]
        outputs_ref = {"$ref": f"#/components/schemas/{output_type_title}"}
        invoker_schema["output"] = outputs_ref
        invoker_schema["class"] = "invocation"
        openapi_schema["components"]["schemas"][f"{output_type_title}"]["class"] = "output"

    from invokeai.backend.model_management.models import get_model_config_enums

    for model_config_format_enum in set(get_model_config_enums()):
        name = model_config_format_enum.__qualname__

        if name in openapi_schema["components"]["schemas"]:
            # print(f"Config with name {name} already defined")
            continue

        # "BaseModelType":{"title":"BaseModelType","description":"An enumeration.","enum":["sd-1","sd-2"],"type":"string"}
        openapi_schema["components"]["schemas"][name] = dict(
            title=name,
            description="An enumeration.",
            type="string",
            enum=list(v.value for v in model_config_format_enum),
        )

    app.openapi_schema = openapi_schema
    return app.openapi_schema


app.openapi = custom_openapi  # type: ignore [method-assign] # this is a valid assignment


@app.get("/docs", include_in_schema=False)
def overridden_swagger():
    return get_swagger_ui_html(
        openapi_url=app.openapi_url,
        title=app.title,
        swagger_favicon_url="/static/docs/favicon.ico",
    )


@app.get("/redoc", include_in_schema=False)
def overridden_redoc():
    return get_redoc_html(
        openapi_url=app.openapi_url,
        title=app.title,
        redoc_favicon_url="/static/docs/favicon.ico",
    )


web_root_path = Path(list(web_dir.__path__)[0])


# Cannot add headers to StaticFiles, so we must serve index.html with a custom route
# Add cache-control: no-store header to prevent caching of index.html, which leads to broken UIs at release
@app.get("/", include_in_schema=False, name="ui_root")
def get_index() -> FileResponse:
    return FileResponse(Path(web_root_path, "dist/index.html"), headers={"Cache-Control": "no-store"})


# # Must mount *after* the other routes else it borks em
app.mount("/static", StaticFiles(directory=Path(web_root_path, "static/")), name="static")  # docs favicon is in here
app.mount("/assets", StaticFiles(directory=Path(web_root_path, "dist/assets/")), name="assets")
app.mount("/locales", StaticFiles(directory=Path(web_root_path, "dist/locales/")), name="locales")


def invoke_api():
    def find_port(port: 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
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
            if s.connect_ex(("localhost", port)) == 0:
                return find_port(port=port + 1)
            else:
                return port

    from invokeai.backend.install.check_root import check_invokeai_root

    check_invokeai_root(app_config)  # note, may exit with an exception if root not set up

    if app_config.dev_reload:
        try:
            import jurigged
        except ImportError as e:
            logger.error(
                'Can\'t start `--dev_reload` because jurigged is not found; `pip install -e ".[dev]"` to include development dependencies.',
                exc_info=e,
            )
        else:
            jurigged.watch(logger=InvokeAILogger.get_logger(name="jurigged").info)

    port = find_port(app_config.port)
    if port != app_config.port:
        logger.warn(f"Port {app_config.port} in use, using port {port}")

    # Start our own event loop for eventing usage
    loop = asyncio.new_event_loop()
    config = uvicorn.Config(
        app=app,
        host=app_config.host,
        port=port,
        loop="asyncio",
        log_level=app_config.log_level,
    )
    server = uvicorn.Server(config)

    # replace uvicorn's loggers with InvokeAI's for consistent appearance
    for logname in ["uvicorn.access", "uvicorn"]:
        log = InvokeAILogger.get_logger(logname)
        log.handlers.clear()
        for ch in logger.handlers:
            log.addHandler(ch)

    loop.run_until_complete(server.serve())


if __name__ == "__main__":
    if app_config.version:
        print(f"InvokeAI version {__version__}")
    else:
        invoke_api()