"""server.py: FastAPI SD-UI Web Host. Notes: async endpoints always run on the main thread. Without they run on the thread pool. """ import json import traceback import sys import os SD_DIR = os.getcwd() print('started in ', SD_DIR) SD_UI_DIR = os.getenv('SD_UI_PATH', None) sys.path.append(os.path.dirname(SD_UI_DIR)) CONFIG_DIR = os.path.abspath(os.path.join(SD_UI_DIR, '..', 'scripts')) MODELS_DIR = os.path.abspath(os.path.join(SD_DIR, '..', 'models')) UI_PLUGINS_DIR = os.path.abspath(os.path.join(SD_DIR, '..', 'plugins', 'ui')) OUTPUT_DIRNAME = "Stable Diffusion UI" # in the user's home folder TASK_TTL = 15 * 60 # Discard last session's task timeout APP_CONFIG_DEFAULTS = { # auto: selects the cuda device with the most free memory, cuda: use the currently active cuda device. 'render_devices': 'auto', # valid entries: 'auto', 'cpu' or 'cuda:N' (where N is a GPU index) 'update_branch': 'main', 'ui': { 'open_browser_on_start': True, }, } APP_CONFIG_DEFAULT_MODELS = [ # needed to support the legacy installations 'custom-model', # Check if user has a custom model, use it first. 'sd-v1-4', # Default fallback. ] from fastapi import FastAPI, HTTPException from fastapi.staticfiles import StaticFiles from starlette.responses import FileResponse, JSONResponse, StreamingResponse from pydantic import BaseModel import logging #import queue, threading, time from typing import Any, Generator, Hashable, List, Optional, Union from sd_internal import Request, Response, task_manager app = FastAPI() modifiers_cache = None outpath = os.path.join(os.path.expanduser("~"), OUTPUT_DIRNAME) os.makedirs(UI_PLUGINS_DIR, exist_ok=True) # don't show access log entries for URLs that start with the given prefix ACCESS_LOG_SUPPRESS_PATH_PREFIXES = ['/ping', '/image', '/modifier-thumbnails'] NOCACHE_HEADERS={"Cache-Control": "no-cache, no-store, must-revalidate", "Pragma": "no-cache", "Expires": "0"} app.mount('/media', StaticFiles(directory=os.path.join(SD_UI_DIR, 'media')), name="media") app.mount('/plugins', StaticFiles(directory=UI_PLUGINS_DIR), name="plugins") def getConfig(default_val=APP_CONFIG_DEFAULTS): try: config_json_path = os.path.join(CONFIG_DIR, 'config.json') if not os.path.exists(config_json_path): return default_val with open(config_json_path, 'r', encoding='utf-8') as f: return json.load(f) except Exception as e: print(str(e)) print(traceback.format_exc()) return default_val def setConfig(config): try: # config.json config_json_path = os.path.join(CONFIG_DIR, 'config.json') with open(config_json_path, 'w', encoding='utf-8') as f: json.dump(config, f) except: print(traceback.format_exc()) try: # config.bat config_bat_path = os.path.join(CONFIG_DIR, 'config.bat') config_bat = [] if 'update_branch' in config: config_bat.append(f"@set update_branch={config['update_branch']}") if os.getenv('SD_UI_BIND_PORT') is not None: config_bat.append(f"@set SD_UI_BIND_PORT={os.getenv('SD_UI_BIND_PORT')}") if os.getenv('SD_UI_BIND_IP') is not None: config_bat.append(f"@set SD_UI_BIND_IP={os.getenv('SD_UI_BIND_IP')}") if len(config_bat) > 0: with open(config_bat_path, 'w', encoding='utf-8') as f: f.write('\r\n'.join(config_bat)) except: print(traceback.format_exc()) try: # config.sh config_sh_path = os.path.join(CONFIG_DIR, 'config.sh') config_sh = ['#!/bin/bash'] if 'update_branch' in config: config_sh.append(f"export update_branch={config['update_branch']}") if os.getenv('SD_UI_BIND_PORT') is not None: config_sh.append(f"export SD_UI_BIND_PORT={os.getenv('SD_UI_BIND_PORT')}") if os.getenv('SD_UI_BIND_IP') is not None: config_sh.append(f"export SD_UI_BIND_IP={os.getenv('SD_UI_BIND_IP')}") if len(config_sh) > 1: with open(config_sh_path, 'w', encoding='utf-8') as f: f.write('\n'.join(config_sh)) except: print(traceback.format_exc()) def resolve_model_to_use(model_name:str, model_type:str, model_dir:str, model_extensions:list, default_models=[]): model_dirs = [os.path.join(MODELS_DIR, model_dir), SD_DIR] if not model_name: # When None try user configured model. config = getConfig() if 'model' in config and model_type in config['model']: model_name = config['model'][model_type] if model_name: # Check models directory models_dir_path = os.path.join(MODELS_DIR, model_dir, model_name) for model_extension in model_extensions: if os.path.exists(models_dir_path + model_extension): return models_dir_path if os.path.exists(model_name + model_extension): # Direct Path to file model_name = os.path.abspath(model_name) return model_name # Default locations if model_name in default_models: default_model_path = os.path.join(SD_DIR, model_name) for model_extension in model_extensions: if os.path.exists(default_model_path + model_extension): return default_model_path # Can't find requested model, check the default paths. for default_model in default_models: for model_dir in model_dirs: default_model_path = os.path.join(model_dir, default_model) for model_extension in model_extensions: if os.path.exists(default_model_path + model_extension): if model_name is not None: print(f'Could not find the configured custom model {model_name}{model_extension}. Using the default one: {default_model_path}{model_extension}') return default_model_path raise Exception('No valid models found.') def resolve_ckpt_to_use(model_name:str=None): return resolve_model_to_use(model_name, model_type='stable-diffusion', model_dir='stable-diffusion', model_extensions=['.ckpt'], default_models=APP_CONFIG_DEFAULT_MODELS) def resolve_vae_to_use(model_name:str=None): try: return resolve_model_to_use(model_name, model_type='vae', model_dir='vae', model_extensions=['.vae.pt', '.ckpt'], default_models=[]) except: return None 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 @app.post('/app_config') async def setAppConfig(req : SetAppConfigRequest): config = 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 try: setConfig(config) if req.render_devices: update_render_threads() return JSONResponse({'status': 'OK'}, headers=NOCACHE_HEADERS) except Exception as e: print(traceback.format_exc()) raise HTTPException(status_code=500, detail=str(e)) def getModels(): models = { 'active': { 'stable-diffusion': 'sd-v1-4', 'vae': '', }, 'options': { 'stable-diffusion': ['sd-v1-4'], 'vae': [], }, } def listModels(models_dirname, model_type, model_extensions): models_dir = os.path.join(MODELS_DIR, models_dirname) if not os.path.exists(models_dir): os.makedirs(models_dir) for file in os.listdir(models_dir): for model_extension in model_extensions: if file.endswith(model_extension): model_name = file[:-len(model_extension)] models['options'][model_type].append(model_name) models['options'][model_type] = [*set(models['options'][model_type])] # remove duplicates models['options'][model_type].sort() # custom models listModels(models_dirname='stable-diffusion', model_type='stable-diffusion', model_extensions=['.ckpt']) listModels(models_dirname='vae', model_type='vae', model_extensions=['.vae.pt', '.ckpt']) # legacy custom_weight_path = os.path.join(SD_DIR, 'custom-model.ckpt') if os.path.exists(custom_weight_path): models['options']['stable-diffusion'].append('custom-model') return models def getUIPlugins(): plugins = [] for file in os.listdir(UI_PLUGINS_DIR): if file.endswith('.plugin.js'): plugins.append(f'/plugins/{file}') return plugins @app.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': config = getConfig(default_val=None) if config is None: config = APP_CONFIG_DEFAULTS return JSONResponse(config, headers=NOCACHE_HEADERS) elif key == 'devices': config = getConfig() devices = task_manager.get_devices() devices['config'] = config.get('render_devices', "auto") return JSONResponse(devices, headers=NOCACHE_HEADERS) elif key == 'models': return JSONResponse(getModels(), headers=NOCACHE_HEADERS) elif key == 'modifiers': return FileResponse(os.path.join(SD_UI_DIR, 'modifiers.json'), headers=NOCACHE_HEADERS) elif key == 'output_dir': return JSONResponse({ 'output_dir': outpath }, headers=NOCACHE_HEADERS) elif key == 'ui_plugins': return JSONResponse(getUIPlugins(), headers=NOCACHE_HEADERS) else: raise HTTPException(status_code=404, detail=f'Request for unknown {key}') # HTTP404 Not Found @app.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: task = task_manager.get_cached_task(session_id, update_ttl=True) if task: response['task'] = id(task) if task.lock.locked(): response['session'] = 'running' elif isinstance(task.error, StopAsyncIteration): response['session'] = 'stopped' elif task.error: response['session'] = 'error' elif not task.buffer_queue.empty(): response['session'] = 'buffer' elif task.response: response['session'] = 'completed' else: response['session'] = 'pending' response['devices'] = task_manager.get_devices() return JSONResponse(response, headers=NOCACHE_HEADERS) def save_model_to_config(ckpt_model_name, vae_model_name): config = getConfig() if 'model' not in config: config['model'] = {} config['model']['stable-diffusion'] = ckpt_model_name config['model']['vae'] = vae_model_name if vae_model_name is None or vae_model_name == "": del config['model']['vae'] setConfig(config) 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 @app.post('/render') def render(req : task_manager.ImageRequest): try: save_model_to_config(req.use_stable_diffusion_model, req.use_vae_model) req.use_stable_diffusion_model = resolve_ckpt_to_use(req.use_stable_diffusion_model) req.use_vae_model = resolve_vae_to_use(req.use_vae_model) new_task = task_manager.render(req) response = { 'status': str(task_manager.current_state), 'queue': len(task_manager.tasks_queue), 'stream': f'/image/stream/{req.session_id}/{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, deny queueing more than one. raise HTTPException(status_code=503, detail=f'Session {req.session_id} has an already pending task.') # HTTP503 Service Unavailable except Exception as e: raise HTTPException(status_code=500, detail=str(e)) @app.get('/image/stream/{session_id:str}/{task_id:int}') def stream(session_id:str, task_id:int): #TODO Move to WebSockets ?? task = task_manager.get_cached_task(session_id, update_ttl=True) if not task: raise HTTPException(status_code=410, detail='No request received.') # HTTP410 Gone 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: #print(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 #print(f'Session {session_id} opened live render stream {id(task.buffer_queue)}') return StreamingResponse(task.read_buffer_generator(), media_type='application/json') @app.get('/image/stop') def stop(session_id:str=None): if not session_id: 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 = task_manager.get_cached_task(session_id, update_ttl=False) if not task: raise HTTPException(status_code=404, detail=f'Session {session_id} has no active task.') # HTTP404 Not Found if isinstance(task.error, StopAsyncIteration): raise HTTPException(status_code=409, detail=f'Session {session_id} task is already stopped.') # HTTP409 Conflict task.error = StopAsyncIteration('') return {'OK'} @app.get('/image/tmp/{session_id}/{img_id:int}') def get_image(session_id, img_id): task = task_manager.get_cached_task(session_id, update_ttl=True) if not task: raise HTTPException(status_code=410, detail=f'Session {session_id} has not submitted a task.') # HTTP410 Gone 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)) @app.get('/') def read_root(): return FileResponse(os.path.join(SD_UI_DIR, 'index.html'), headers=NOCACHE_HEADERS) @app.on_event("shutdown") def shutdown_event(): # Signal render thread to close on shutdown task_manager.current_state_error = SystemExit('Application shutting down.') # don't log certain requests class LogSuppressFilter(logging.Filter): def filter(self, record: logging.LogRecord) -> bool: path = record.getMessage() for prefix in ACCESS_LOG_SUPPRESS_PATH_PREFIXES: if path.find(prefix) != -1: return False return True logging.getLogger('uvicorn.access').addFilter(LogSuppressFilter()) # Start the task_manager task_manager.default_model_to_load = resolve_ckpt_to_use() task_manager.default_vae_to_load = resolve_vae_to_use() def update_render_threads(): config = getConfig() render_devices = config.get('render_devices', 'auto') active_devices = task_manager.get_devices()['active'].keys() print('requesting for render_devices', render_devices) task_manager.update_render_threads(render_devices, active_devices) update_render_threads() # start the browser ui def open_browser(): config = getConfig() ui = config.get('ui', {}) if ui.get('open_browser_on_start', True): import webbrowser; webbrowser.open('http://localhost:9000') open_browser()