InvokeAI/invokeai/app/api_app.py

# Copyright (c) 2022 Kyle Schouviller (https://github.com/kyle0654)
import asyncio
from inspect import signature

import uvicorn

from invokeai.backend.util.logging import InvokeAILogger
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 pathlib import Path
from pydantic.schema import schema

from .api.dependencies import ApiDependencies
from .api.routers import sessions, models, images
from .api.sockets import SocketIO
from .invocations.baseinvocation import BaseInvocation
from .services.config import InvokeAIAppConfig

logger = InvokeAILogger.getLogger()

# 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)

# 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)

# initialize config
# this is a module global
app_config = InvokeAIAppConfig()

# Add startup event to load dependencies
@app.on_event("startup")
async def startup_event():
    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,
    )

    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
# TODO: REMOVE
# app.include_router(
#     invocation.invocation_router,
#     prefix = '/api')

app.include_router(sessions.session_router, prefix="/api")

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

app.include_router(images.images_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,
    )

    # 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 = schema(output_types, ref_prefix="#/components/schemas/")
    for schema_key, output_schema in output_schemas["definitions"].items():
        openapi_schema["components"]["schemas"][schema_key] = output_schema

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

        invoker_schema["output"] = outputs_ref

    app.openapi_schema = openapi_schema
    return app.openapi_schema


app.openapi = custom_openapi

# Override API doc favicons
app.mount("/static", StaticFiles(directory=Path(web_dir.__path__[0], 'static/dream_web')), name="static")


@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/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/favicon.ico",
    )


# Must mount *after* the other routes else it borks em
app.mount("/", 
          StaticFiles(directory=Path(web_dir.__path__[0],"dist"), 
                      html=True
                     ), name="ui"
         )

def invoke_api():
    # Start our own event loop for eventing usage
    loop = asyncio.new_event_loop()
    config = uvicorn.Config(app=app, host=app_config.host, port=app_config.port, loop=loop)
    # Use access_log to turn off logging
    server = uvicorn.Server(config)
    loop.run_until_complete(server.serve())

if __name__ == "__main__":
    invoke_api()