"""server.py: FastAPI SD-UI Web Host. Notes: async endpoints always run on the main thread. Without they run on the thread pool. """ import os import traceback import logging import datetime from typing import List, Union from fastapi import FastAPI, HTTPException from fastapi.staticfiles import StaticFiles from starlette.responses import FileResponse, JSONResponse, StreamingResponse from pydantic import BaseModel from sd_internal import app, model_manager, task_manager from sd_internal import TaskData from diffusionkit.types import GenerateImageRequest log = logging.getLogger() log.info(f'started in {app.SD_DIR}') log.info(f'started at {datetime.datetime.now():%x %X}') server_api = FastAPI() NOCACHE_HEADERS={"Cache-Control": "no-cache, no-store, must-revalidate", "Pragma": "no-cache", "Expires": "0"} class NoCacheStaticFiles(StaticFiles): def is_not_modified(self, response_headers, request_headers) -> bool: if 'content-type' in response_headers and ('javascript' in response_headers['content-type'] or 'css' in response_headers['content-type']): response_headers.update(NOCACHE_HEADERS) return False return super().is_not_modified(response_headers, request_headers) class SetAppConfigRequest(BaseModel): update_branch: str = None render_devices: Union[List[str], List[int], str, int] = None model_vae: str = None ui_open_browser_on_start: bool = None listen_to_network: bool = None listen_port: int = None server_api.mount('/media', NoCacheStaticFiles(directory=os.path.join(app.SD_UI_DIR, 'media')), name="media") for plugins_dir, dir_prefix in app.UI_PLUGINS_SOURCES: server_api.mount(f'/plugins/{dir_prefix}', NoCacheStaticFiles(directory=plugins_dir), name=f"plugins-{dir_prefix}") @server_api.post('/app_config') async def setAppConfig(req : SetAppConfigRequest): config = app.getConfig() if req.update_branch is not None: config['update_branch'] = req.update_branch if req.render_devices is not None: update_render_devices_in_config(config, req.render_devices) if req.ui_open_browser_on_start is not None: if 'ui' not in config: config['ui'] = {} config['ui']['open_browser_on_start'] = req.ui_open_browser_on_start if req.listen_to_network is not None: if 'net' not in config: config['net'] = {} config['net']['listen_to_network'] = bool(req.listen_to_network) if req.listen_port is not None: if 'net' not in config: config['net'] = {} config['net']['listen_port'] = int(req.listen_port) try: app.setConfig(config) if req.render_devices: app.update_render_threads() return JSONResponse({'status': 'OK'}, headers=NOCACHE_HEADERS) except Exception as e: log.error(traceback.format_exc()) raise HTTPException(status_code=500, detail=str(e)) def update_render_devices_in_config(config, render_devices): if render_devices not in ('cpu', 'auto') and not render_devices.startswith('cuda:'): raise HTTPException(status_code=400, detail=f'Invalid render device requested: {render_devices}') if render_devices.startswith('cuda:'): render_devices = render_devices.split(',') config['render_devices'] = render_devices @server_api.get('/get/{key:path}') def read_web_data(key:str=None): if not key: # /get without parameters, stable-diffusion easter egg. raise HTTPException(status_code=418, detail="StableDiffusion is drawing a teapot!") # HTTP418 I'm a teapot elif key == 'app_config': return JSONResponse(app.getConfig(), headers=NOCACHE_HEADERS) elif key == 'system_info': config = app.getConfig() system_info = { 'devices': task_manager.get_devices(), 'hosts': app.getIPConfig(), 'default_output_dir': os.path.join(os.path.expanduser("~"), app.OUTPUT_DIRNAME), } system_info['devices']['config'] = config.get('render_devices', "auto") return JSONResponse(system_info, headers=NOCACHE_HEADERS) elif key == 'models': return JSONResponse(model_manager.getModels(), headers=NOCACHE_HEADERS) elif key == 'modifiers': return FileResponse(os.path.join(app.SD_UI_DIR, 'modifiers.json'), headers=NOCACHE_HEADERS) elif key == 'ui_plugins': return JSONResponse(app.getUIPlugins(), headers=NOCACHE_HEADERS) else: raise HTTPException(status_code=404, detail=f'Request for unknown {key}') # HTTP404 Not Found @server_api.get('/ping') # Get server and optionally session status. def ping(session_id:str=None): if task_manager.is_alive() <= 0: # Check that render threads are alive. if task_manager.current_state_error: raise HTTPException(status_code=500, detail=str(task_manager.current_state_error)) raise HTTPException(status_code=500, detail='Render thread is dead.') if task_manager.current_state_error and not isinstance(task_manager.current_state_error, StopAsyncIteration): raise HTTPException(status_code=500, detail=str(task_manager.current_state_error)) # Alive response = {'status': str(task_manager.current_state)} if session_id: session = task_manager.get_cached_session(session_id, update_ttl=True) response['tasks'] = {id(t): t.status for t in session.tasks} response['devices'] = task_manager.get_devices() return JSONResponse(response, headers=NOCACHE_HEADERS) @server_api.post('/render') def render(req: dict): try: # separate out the request data into rendering and task-specific data render_req: GenerateImageRequest = GenerateImageRequest.parse_obj(req) task_data: TaskData = TaskData.parse_obj(req) render_req.init_image_mask = req.get('mask') # hack: will rename this in the HTTP API in a future revision app.save_to_config(task_data.use_stable_diffusion_model, task_data.use_vae_model, task_data.use_hypernetwork_model, task_data.vram_usage_level) # enqueue the task new_task = task_manager.render(render_req, task_data) response = { 'status': str(task_manager.current_state), 'queue': len(task_manager.tasks_queue), 'stream': f'/image/stream/{id(new_task)}', 'task': id(new_task) } return JSONResponse(response, headers=NOCACHE_HEADERS) except ChildProcessError as e: # Render thread is dead raise HTTPException(status_code=500, detail=f'Rendering thread has died.') # HTTP500 Internal Server Error except ConnectionRefusedError as e: # Unstarted task pending limit reached, deny queueing too many. raise HTTPException(status_code=503, detail=str(e)) # HTTP503 Service Unavailable except Exception as e: log.error(traceback.format_exc()) raise HTTPException(status_code=500, detail=str(e)) @server_api.get('/image/stream/{task_id:int}') def stream(task_id:int): #TODO Move to WebSockets ?? task = task_manager.get_cached_task(task_id, update_ttl=True) if not task: raise HTTPException(status_code=404, detail=f'Request {task_id} not found.') # HTTP404 NotFound #if (id(task) != task_id): raise HTTPException(status_code=409, detail=f'Wrong task id received. Expected:{id(task)}, Received:{task_id}') # HTTP409 Conflict if task.buffer_queue.empty() and not task.lock.locked(): if task.response: #log.info(f'Session {session_id} sending cached response') return JSONResponse(task.response, headers=NOCACHE_HEADERS) raise HTTPException(status_code=425, detail='Too Early, task not started yet.') # HTTP425 Too Early #log.info(f'Session {session_id} opened live render stream {id(task.buffer_queue)}') return StreamingResponse(task.read_buffer_generator(), media_type='application/json') @server_api.get('/image/stop') def stop(task: int): if not task: if task_manager.current_state == task_manager.ServerStates.Online or task_manager.current_state == task_manager.ServerStates.Unavailable: raise HTTPException(status_code=409, detail='Not currently running any tasks.') # HTTP409 Conflict task_manager.current_state_error = StopAsyncIteration('') return {'OK'} task_id = task task = task_manager.get_cached_task(task_id, update_ttl=False) if not task: raise HTTPException(status_code=404, detail=f'Task {task_id} was not found.') # HTTP404 Not Found if isinstance(task.error, StopAsyncIteration): raise HTTPException(status_code=409, detail=f'Task {task_id} is already stopped.') # HTTP409 Conflict task.error = StopAsyncIteration(f'Task {task_id} stop requested.') return {'OK'} @server_api.get('/image/tmp/{task_id:int}/{img_id:int}') def get_image(task_id: int, img_id: int): task = task_manager.get_cached_task(task_id, update_ttl=True) if not task: raise HTTPException(status_code=410, detail=f'Task {task_id} could not be found.') # HTTP404 NotFound if not task.temp_images[img_id]: raise HTTPException(status_code=425, detail='Too Early, task data is not available yet.') # HTTP425 Too Early try: img_data = task.temp_images[img_id] img_data.seek(0) return StreamingResponse(img_data, media_type='image/jpeg') except KeyError as e: raise HTTPException(status_code=500, detail=str(e)) @server_api.get('/') def read_root(): return FileResponse(os.path.join(app.SD_UI_DIR, 'index.html'), headers=NOCACHE_HEADERS) @server_api.on_event("shutdown") def shutdown_event(): # Signal render thread to close on shutdown task_manager.current_state_error = SystemExit('Application shutting down.') # Init the app model_manager.init() app.init() # start the browser ui app.open_browser()